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Find video protocols related to scientific articles indexed in Pubmed.
Clinical, Functional, and Morphological Evaluations of Posterior Cruciate Ligament Reconstruction With Remnant Preservation: Minimum 2-Year Follow-up.
Am J Sports Med
PUBLISHED: 06-18-2014
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Numerous posterior cruciate ligament (PCL) reconstruction techniques have evolved and have revealed satisfactory outcomes; however, the optimal operative method for PCL reconstruction remains controversial.
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Comparison of the ceiling effect in the Lysholm score and the IKDC subjective score for assessing functional outcome after ACL reconstruction.
Knee
PUBLISHED: 05-28-2014
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To compare the ceiling effect of the Lysholm and IKDC subjective scores for assessing functional outcome after ACL reconstruction and evaluated the correlation with the one-leg hop test.
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Clinical and Radiologic Outcomes After Meniscus Allograft Transplantation at 1-Year and 4-Year Follow-up.
Arthroscopy
PUBLISHED: 05-20-2014
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To assess the clinical and radiologic outcomes of meniscus allograft transplantation (MAT) with serial evaluation at 1 year and at 4 years.
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Traumatic posterior root tear of the medial meniscus in patients with severe medial instability of the knee.
Knee Surg Sports Traumatol Arthrosc
PUBLISHED: 03-11-2014
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To examine the incidence and diagnostic rate of traumatic medial meniscus posterior root tear associated with severe medial instability and to evaluate the effectiveness of pullout repair.
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Comparison of second-look arthroscopic findings and clinical results according to the amount of preserved remnant in anterior cruciate ligament reconstruction.
Knee
PUBLISHED: 02-07-2014
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Although ACL reconstruction is prevalent, the most effective method for ACL reconstruction still remains controversial. The purpose of this study was to evaluate the effect of the preserved remnant in ACL reconstruction on graft morphology at second-look arthroscopy and clinical outcomes.
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Medial meniscus posterior root tear: a comprehensive review.
Knee Surg Relat Res
PUBLISHED: 02-01-2014
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Damage to the medial meniscus root, for example by a complete radial tear, destroys the ability of the knee to withstand hoop strain, resulting in contact pressure increases and kinematic alterations. For these reasons, several techniques have been developed to repair the medial meniscus posterior root tear (MMPRT), many of which have shown complete healing of the repaired MMPRT. However, efforts to standardize or optimize the treatment for MMPRT are much needed. When planning a surgical intervention for an MMPRT, strict surgical indications regarding the effect of pullout strength on the refixed root, bony degenerative changes, mechanical alignment, and the Kellgren-Lawrence grade should be considered. Although there are several treatment options and controversies, the current trend is to repair the MMPRT using various techniques including suture anchors and pullout sutures if the patient meets the indications. However, there are still debates on the restoration of hoop tension and prevention of arthritis after repair and further biomechanical and clinical studies should be conducted in the future. The aim of this article was to review and summarize the recent literature regarding various diagnosis and treatment strategies of MMPRT, especially focusing on conflict issues including whether repair techniques can restore the main function of normal meniscus and which is the best suture technique to repair the MMPRT. The authors attempted to provide a comprehensive review of previous studies ranging from basic science to current surgical techniques.
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No correction angle loss with stable plates in open-wedge high tibial osteotomy.
Knee Surg Sports Traumatol Arthrosc
PUBLISHED: 01-30-2014
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The aim of this study was to compare the clinical and radiological results of the wedge plate and locking plate systems in open-wedge high tibial osteotomy.
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Clinical, Radiological, and Morphological Evaluations of Posterior Horn Tears of the Lateral Meniscus Left In Situ During Anterior Cruciate Ligament Reconstruction.
Am J Sports Med
PUBLISHED: 12-04-2013
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BACKGROUND:Recent studies have shown that lateral menisci have a higher healing potential and that they can be treated successfully without symptoms by being left in situ during anterior cruciate ligament (ACL) reconstruction. However, few studies have reported morphological results. HYPOTHESIS:Stable posterior horn tears of the lateral meniscus left in situ during ACL reconstruction could be healed spontaneously and would result in not only successful clinical outcomes but also morphological restoration. STUDY DESIGN:Cohort study; Level of evidence, 3. METHODS:Among 367 patients who underwent primary ACL reconstruction between 2008 and 2010, 53 patients who had lateral meniscus tears that were left in situ were analyzed. These patients were evaluated subjectively and radiologically and compared with a matched control group that underwent ACL reconstruction without any other structural disorders. Of the 53 patients with stable posterior horn tears of the lateral meniscus left in situ, 28 patients were assessed by second-look arthroscopic surgery and magnetic resonance imaging (MRI). RESULTS:The mean follow-up of the study group and the control group was 36.47 and 37.26 months, respectively. There were no statistical differences in postoperative clinical outcomes between the 2 groups. Clinical results of both groups including the Lysholm score, Tegner activity score, and International Knee Documentation Committee (IKDC) score significantly improved. In the subgroup composed of 28 patients, follow-up MRI showed 25 (89%) and 24 (86%) healed menisci in sagittal and coronal views, respectively. Twenty-one (75%) were considered to be completely healed, and 5 (18%) were incompletely healed on second-look arthroscopic surgery. CONCLUSION:Stable posterior horn tears of the lateral meniscus left in situ at the time of ACL reconstruction revealed successful clinical outcomes compared with isolated ACL injuries and showed considerable healing and functional restoration of tears with repeat MRI and second-look arthroscopic surgery. Therefore, leaving stable posterior horn tears of the lateral meniscus in situ during ACL reconstruction should be considered.
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One-stage revision anterior cruciate ligament reconstruction with impacted bone graft after failed primary reconstruction.
Orthopedics
PUBLISHED: 11-09-2013
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Revision anterior cruciate ligament reconstruction can be performed in a 1- or 2-stage procedure. Restoration of bone stock using bone grafting is often required for good results. The authors performed 1-stage revision surgery with a more lateral and oblique femoral tunnel and an impacted bone graft to avoid the bone defect caused by the previous screw removal from a malpositioned tunnel. No evidence existed of revision surgery failure or viral transmission in any of 17 cases at 2-year follow-up. The authors technique is also useful for a slightly misplaced femoral tunnel.
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Functional performance tests as indicators of returning to sports after anterior cruciate ligament reconstruction.
Knee
PUBLISHED: 08-22-2013
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There is a lack of standardized objective criteria to accurately assess the ability of a patient to progress through the end stages of rehabilitation and safely return to their previous level of athletic activity after anterior cruciate ligament (ACL) reconstruction.
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Evaluation of femoral tunnel positioning using 3-dimensional computed tomography and radiographs after single bundle anterior cruciate ligament reconstruction with modified transtibial technique.
Clin Orthop Surg
PUBLISHED: 08-20-2013
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The purpose of this study is to report a modified transtibial technique to approach the center of anatomical femoral footprint in anterior cruciate ligament (ACL) reconstruction and to investigate the accurate femoral tunnel position with 3-dimensional computed tomography (3D-CT) and radiography after reconstruction.
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Rehabilitation after posterior cruciate ligament reconstruction: a review of the literature and theoretical support.
Arch Orthop Trauma Surg
PUBLISHED: 06-21-2013
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The purpose of this study was to conduct a literature review of studies that have addressed rehabilitation after posterior cruciate ligament (PCL) reconstruction. In particular, we intended to perform categorical analysis and discuss some critical points.
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Posterolateral corner reconstruction using the single fibular sling method for posterolateral rotatory instability of the knee.
Am J Sports Med
PUBLISHED: 05-29-2013
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Recently, posterolateral corner (PLC) reconstruction techniques have been developed based on an anatomic study of cadaveric dissections. However, the best operative method for various anatomic reconstructions remains controversial.
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Development and validation of a new evaluation system for patients with a floor-based lifestyle: the Korean knee score.
Clin. Orthop. Relat. Res.
PUBLISHED: 05-23-2013
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Patients perspectives on functioning and health have been increasingly recognized as a crucial aspect of health care, leading to the use of patient-reported instruments for outcome assessment. However, available instruments for total knee arthroplasty do not reflect the floor-based lifestyle with high knee flexion of eastern Asia.
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Reliability of the imaging software in the preoperative planning of the open-wedge high tibial osteotomy.
Knee Surg Sports Traumatol Arthrosc
PUBLISHED: 04-16-2013
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The purpose of this study was to verify a recently developed picture-archiving and communications system-photoshop method by comparing reliabilities between real-size paper template and the PACS-photoshop methods in preoperative planning of open-wedge high tibial osteotomy.
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Osteonecrosis of the knee after arthroscopic partial meniscectomy.
Knee Surg Relat Res
PUBLISHED: 03-21-2013
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Osteonecrosis of the femoral condyle is known as an uncommon complication after arthroscopic meniscectomy. The lesion of osteonecrosis can be irreversible, thus early detection of the disease is crucial for treatment. A 50-year-old male patient without known risk factors of osteonecrosis developed increasing knee pain after arthroscopic partial meniscectomy. Magnetic resonance imaging showed rapid progression of osteonecrosis of the medial femoral condyle. Unicompartmental knee arthroplasty was performed after 9 months of conservative therapy. The patient is now free from pain during daily activities. It might be important to remind that if the patients pain after arthroscopic partial meniscectomy is severe than expected, clinical doctors should pay attention to the possibility of ongoing osteonecrosis of the femoral condyle.
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Meniscal extrusion and spontaneous osteonecrosis with root tear of medial meniscus: comparison with horizontal tear.
Arthroscopy
PUBLISHED: 02-05-2013
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The incidence of root tears in patients with spontaneous osteonecrosis of the knee has been studied, but the incidence of spontaneous osteonecrosis of the knee in patients with medial meniscus root tears has not. We assessed the latter incidence and evaluated the characteristics of medial meniscus root tears by comparing clinical status, the degree of osteonecrosis, and meniscal extrusion in patients with horizontal tears.
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Translation and validation of the korean version of the international knee documentation committee subjective knee form.
Knee Surg Relat Res
PUBLISHED: 01-21-2013
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To perform a cross-cultural adaptation and to test the measurement properties of the Korean version of International Knee Documentation Committee (K-IKDC) Subjective Knee Form.
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Relationships among tendon regeneration on MRI, flexor strength, and functional performance after anterior cruciate ligament reconstruction with hamstring autograft.
Am J Sports Med
PUBLISHED: 10-12-2011
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There are numerous reports on hamstring tendon regeneration after harvest for anterior cruciate ligament (ACL) reconstruction. However, few studies have evaluated the relationships among the magnetic resonance imaging (MRI) findings of hamstring regeneration, muscle strength, and functional results.
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Fibrin clot delivery system for meniscal repair.
Knee Surg Relat Res
PUBLISHED: 05-07-2011
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As meniscal preservation particularly in younger active individuals with a symptomatic meniscal tear remains the preferred treatment option, various methods have been suggested to increase healing and success rates after meniscal repair. The recent increase in clinical use of platelet rich plasma has contributed to the increased use of fibrin clot, which virtually has the same healing property. However, despite the relative ease of acquisition and preparation of fibrin clots, delivering it to the desired target area arthroscopically is challenging. Therefore, we report with a pertinent literature review a novel method of planting a fibrin clot to the desired area of meniscal tear arthroscopically using our delivery system to enhance healing.
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The effects of hamstring harvesting on outcomes in anterior cruciate ligament-reconstructed patients: a comparative study between hamstring-harvested and -unharvested patients.
Arthroscopy
PUBLISHED: 03-31-2011
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The purpose of this study was to evaluate the effects of hamstring harvesting in patients after anterior cruciate ligament (ACL) reconstruction by comparing groups with and without hamstring harvesting.
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Comparison between Single and Dual Femoral Fixation for Anterior Cruciate Ligament Reconstruction with a Hamstring Autograft.
Knee Surg Relat Res
PUBLISHED: 03-29-2011
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The purpose of this study was to evaluate dual fixation with different fixation mechanisms, determine the advantages, and compare the outcomes between single and dual femoral fixation.
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Neural correlates related to action observation in expert archers.
Behav. Brain Res.
PUBLISHED: 03-22-2011
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A growing body of evidence suggests that activity of the mirror neuron system is dependent on the observers motor experience of a given action. It remains unclear, however, whether activity of the mirror neuron system is also associated with the observers motor experience in sports game. Therefore, the aim of the present study is to investigate differences in activation of the mirror neuron system during action observation between experts and non-archer control subjects. We used video of Western-style archery in which participants were asked to watch the archery movements. Hyperactivation of the premotor and inferior parietal cortex in expert archers relative to non-archer control subjects suggests that the human mirror neuron system could contain and expand representations of the motor repertoire. The fact that dorsomedial prefrontal cortex was more active in expert archers than in non-archer control subjects indicates a spontaneous engagement of theory of mind in experts when watching video of Western-style archery. Compared with the non-archer control subjects, expert archers showed greater activation in the neural system in regions associated with episodic recall from familiar and meaningful information, including the cingulate cortex, retrosplenial cortex, and parahippocampal gyrus. The results demonstrate that expertise effects stimulate brain activity not only in the mirror neuron system but also in the neural networks related to theory of mind and episodic memory.
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Reducing the size of the meniscal allograft decreases the percentage of extrusion after meniscal allograft transplantation.
Arthroscopy
PUBLISHED: 02-11-2011
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The purpose was to evaluate the amount of extrusion and clinical and radiographic outcomes of meniscal allograft transplantation (MAT) after use of a modified Pollard method to measure the size of the meniscus.
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Medial meniscus allograft transplantation using a modified bone plug technique: clinical, radiologic, and arthroscopic results.
Arthroscopy
PUBLISHED: 02-09-2011
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To determine clinical, radiologic, and arthroscopic results of our meniscus allograft transplantation (MAT) by use of modified bone plug technique, which permits easy passage of the allograft by reducing the size of the posterior bone plug.
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Safe zone for the approach to the posterior sole (heel): a cadaver study.
J Orthop Sci
PUBLISHED: 01-14-2011
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Surgical approach to the posterior sole or heel is commonly used for various orthopedic procedures. The objective of this cadaver study was to identify the risks to local neurovascular structures using an approach to the posterior sole or heel and to define the safe zone for minimizing the risk of injury.
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Relationship between meniscal extrusion and various clinical findings after meniscus allograft transplantation.
Am J Sports Med
PUBLISHED: 09-07-2010
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Meniscus allograft transplantation (MAT) is useful for meniscus-deficient knees. Although meniscal extrusion is common after MAT, there is no consensus regarding the criteria for normal meniscal extrusion or the relationship between clinical and radiologic results.
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The effectiveness of minimally invasive total knee arthroplasty to preserve quadriceps strength: a randomized controlled trial.
Knee
PUBLISHED: 08-12-2010
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We performed a single-center, randomized, double-blind study to compare muscle strength in patients who had undergone primary total knee arthroplasty (TKA), performed using either a minimally invasive or a conventional surgical technique. We evaluated 30 knees in healthy age-matched subjects, 22 knees after conventional TKA (conventional group), and 23 knees after minimally invasive surgery TKA (MIS group). The Hospital for Special Surgery (HSS) score, Oxford knee score (OKS), and isokinetic (60º/s) muscle strength were evaluated the day before surgery and 3, 6, and 12 months after surgery. HSS and OKS improved significantly over time during follow-up (p<0.001), but there was no significant difference between the groups (p>0.05). The extensor peak torque (EPT) and flexor peak torque (FPT) improved significantly over time (p<0.001) and EPT was greater in the MIS group than in the conventional group during the follow-up period (p<0.05). There was no difference in FPT and the hamstring-to-quadriceps ratio between the groups. Although MIS patients had a significant deficit in extensor strength following TKA, compared with healthy controls, this approach offers a significant improvement in extensor muscle strength over conventional surgery. These results suggest that the MIS approach results in better outcomes with regard to maintaining extensor strength than the conventional surgical approach.
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Posterior cruciate ligament tibial insertion anatomy and implications for tibial tunnel placement.
Arthroscopy
PUBLISHED: 06-21-2010
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The purposes of this study were (1) to predict the tibial insertion of the posterior cruciate ligament (PCL) and posterior cortex that aligned with the tibial tunnel (PCTT) by use of 2-dimensional plain radiographs by evaluating the relation between plain radiograph and computed tomography (CT) images and (2) to determine the safe angle of the tibial guide for preventing breakage of the posterior cortex.
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Comparative outcome analysis of malpositioned and properly positioned fixation groups after hamstring autograft ACL reconstruction with femoral cross-pin fixation.
Knee
PUBLISHED: 03-31-2010
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Anterior cruciate ligament (ACL) reconstruction using soft tissue grafts has been gaining in popularity. Cross-pin fixation is used frequently, and its principle of fixation is an expansion mechanism. However, some malpositioned cases have been reported, and these malpositions may cause poor outcomes. Our aim was to compare the stability and clinical results between malpositioned and properly positioned cases. From November 2003 to December 2007, 41 patients were enrolled in this study. We divided these patients into malpositioned and properly positioned subgroups. The malpositioned group was defined by the presence of any finding among the following: posteriorly directed cross-pin to the posterior condylar line upon axial imaging, breakage upon coronal imaging, and outside-positioned cross-pin to the distal femoral posterior cortex upon sagittal imaging. We compared clinical and stability results between the two groups. Twenty-three patients were included in the properly positioned group, and 18 in the malpositioned group. The intra-class correlation coefficient for the intra- and inter-rater agreement ranged from 0.88 to 0.93 (0.88, 0.91, 0.91, and 0.93). No significant differences were found between the two groups in the stability assessment using a KT-2000 arthrometer and pivot-shift test (P=0.93 and 0.78, respectively). No significant differences were found between the two groups in the clinical knee scales (Ps=0.08-0.93). This study showed that some malpositions can occur with cross-pin femoral fixation. However, we obtained comparable good outcomes regardless of the fixation strategies if the initial fixation was correct.
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Serial assessment of knee joint moments in posterior cruciate ligament and posterolateral corner reconstructed patients during a turn running task.
Arch Orthop Trauma Surg
PUBLISHED: 01-20-2010
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During post-operative rehabilitation for posterior cruciate ligament (PCL) reconstruction, flexion is limited to 90° for the first 6 weeks, and hamstring strengthening is initiated at 3 months because of static stability. The posterolateral corner sling (PLCS) procedure is frequently performed with PCL reconstruction to help alleviate posterolateral rotator instability, and it is possible, during this procedure, to damage the dynamic motion and to over-constrain the knee.
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Medial meniscus root tear refixation: comparison of clinical, radiologic, and arthroscopic findings with medial meniscectomy.
Arthroscopy
PUBLISHED: 01-04-2010
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To investigate the clinical, radiologic, and arthroscopic findings of pullout repair in medial meniscus root tear (MRT) and to compare the results of pullout repair and partial meniscectomy.
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Arthroscopically assisted medial meniscal allograft transplantation using a modified bone plug to facilitate passage: surgical technique.
J Knee Surg
PUBLISHED: 07-29-2009
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This article describes a novel medial meniscal allograft transplantation method that permits easy passage of posterior bone plugs and facilitates bone-to-bone healing. With this method, an anterior bone plug with a long cylindrical shape is prepared, and the posterior bone plug is prepared using only a 2-mm deep, flat bone shell containing cancellous material with 6 baseball Ethibond stitches placed around it. The graft is divided into 3 portions, and boundaries of each are marked. Using a posteromedial portal, the posterior bony bed is prepared directly, and the exact anatomic location is visualized. This modified method facilitates graft passage as well as bone-to-bone healing.
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Effects of sports injury prevention training on the biomechanical risk factors of anterior cruciate ligament injury in high school female basketball players.
Am J Sports Med
PUBLISHED: 06-26-2009
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Female athletes have a higher risk of anterior cruciate ligament injury than their male counterparts who play at similar levels in sports involving pivoting and landing.
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Posterolateral corner anatomy and its anatomical reconstruction with single fibula and double femoral sling method: anatomical study and surgical technique.
Arch Orthop Trauma Surg
PUBLISHED: 04-22-2009
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This paper reports a novel method for reconstructing the posterolateral structures [lateral collateral ligament (LCL), popliteus tendon, popliteofibular ligament] based on an anatomical study of a cadaveric dissection. The popliteus tendon was found to always be attached to the anterior-inferior portion of the femoral attachment site of the LCL, and the average distance from the origin of the popliteal tendon in the femoral side to that of the LCL was 18.5 mm (17-20). The insertion site of the LCL in the fibular side was located anterior-inferior-superficially and the popliteofibular ligament was inserted into the posterior-superior-deep portion around the styloid process. Two femoral tunnels and one fibular head tunnel were made at the proximal and distal portion of the anatomical insertion sites.
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Structural change of soft tissue anterior cruciate ligament reconstructions with cross-pin fixation between immediate and postoperative 8 weeks: a study with use of magnetic resonance imaging.
Am J Sports Med
PUBLISHED: 04-21-2009
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There is some controversy regarding the optional method for proximal fixation in anterior cruciate ligament reconstruction surgery using soft tissue grafts. Concern about the strength of fixation has limited rehabilitation during the early postoperative period.
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A meta-analysis of the effect of neuromuscular training on the prevention of the anterior cruciate ligament injury in female athletes.
Knee Surg Sports Traumatol Arthrosc
PUBLISHED: 03-19-2009
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Female athletes are more prone to anterior cruciate ligament (ACL) injury than their male counterparts, presumably because of anatomical, hormonal, and neuromuscular differences. Of these three, only the neuromuscular component can be modified by preventive exercise. We aimed to evaluate the effect of a neuromuscular protocol on the prevention of ACL injury by performing meta-analysis, and to identify essential factors by subgroup analysis. An extensive literature review was conducted to identify relevant studies, and eventually, only seven randomized controlled trials or prospective cohort studies were included in the analysis. The odds ratios (OR) and the confidence interval (CI) for the overall effects of training and of potentially contributory factors were estimated. The OR and the 95% CI for the overall effect of the preventive training were 0.40 and [0.27, 0.60], respectively. Subgroup analysis revealed that an age under 18, soccer rather than handball, pre- and in-season training rather than either pre- or in-season training, and the plyometrics and strengthening components rather than balancing were significant. Meta-analysis showed that pre- and in-season neuromuscular training with an emphasis on plyometrics and strengthening exercises was effective at preventing ACL injury in female athletes, especially in those under 18 years of age. Further study is required to develop a relevant training program protocol of appropriate intensity.
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The relationship between tibial slope and meniscal insertion.
Knee Surg Sports Traumatol Arthrosc
PUBLISHED: 03-14-2009
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Despite increasing interest in the anatomic importance of the meniscal insertion, little information is available regarding the relationship between the tibial slope and the meniscal insertion. Lateral radiographs and MRI sagittal images from 100 healthy and young patients were used in this study. Patients without deformation, meniscal pathology, or previous surgery to the ipsilateral knee were included in this study. We measured the angle between a line tangent to the medial and lateral tibial slope and the proximal tibial anatomical axis using a lateral radiographs. We also measured the angle between the tangent line to the medial and lateral tibial insertion of the meniscus and the proximal tibial anatomical axis using sagittal MRI images. The measurements were carried out twice by two observers. Inter-observer reliability ranged from 0.98 to 0.99 and intra-observer reliability ranged from 0.83 to 0.94. For each observer, the mean differences between measurements made using radiographs and MRI images were 16.4 degrees and 16.4 degrees on the lateral side, respectively, and 6.0 degrees and 5.9 degrees on the medial side, respectively. There was a statistically significant difference between measurements made using radiographs and MRI images (p < 0.001). However, the Pearsons correlation coefficient between the measurements made using radiographs and MRI images did not show a linear correlation. The measurements of posterior slope on lateral radiographs images and meniscal insertion on sagittal MRI images were reproducible and reliable. Differences in measurements ranged from 15 degrees to 17 degrees on the lateral side and from 5 degrees to 6 degrees on the medial side, with 95% confidence intervals. However, there was no statistical correlation between the measurements made using lateral radiographs and MRI images.
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Posterior root tear of the medial meniscus in multiple knee ligament injuries.
Knee
PUBLISHED: 02-06-2009
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The purposes of the present study were to examine the frequency and characteristics of root tears of the medial meniscus associated with ligament injuries of the knee and to evaluate the effectiveness of pull-out repair for restoring meniscus function. We retrospectively analyzed the 9 patients (10 knees) with posterior root tears of the medial meniscus and ligament injuries of the knee treated between August 2004 and February 2007. All the patients were male, with average age of 29.8 years, and the mean follow-up period was 29.7 months. The pull-out suture technique was used to repair the root tears. Clinical outcomes were evaluated using the Lysholm, IKDC, and Tegner scores, as well as the McMurray and Apley tests. The mean follow-up period was 41.1 months (range, 30 to 63 months). The incidence of root tears of the medial meniscus with ligament injuries was 2.74% (10 cases in 365 ligament surgeries). All clinical results showed significant improvement. At the final follow-up, McMurray test showed one positive and nine negative cases, and the Apley test revealed two positive and eight negative cases. There were no positive findings in anterior drawer test, posterior drawer test, valgus and varus stress test, and posterolateral instability test. Healing of the root tear was confirmed by arthroscopy in five patients and by MR in four patients. Root tears of the medial meniscus may occur in multiple knee ligament injuries. It is important not to miss them. Our results indicate that pull-out repair provides satisfactory results and evidence of healing.
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Correlation between the rotational degree of the dial test and arthroscopic and physical findings in posterolateral rotatory instability.
Knee Surg Sports Traumatol Arthrosc
PUBLISHED: 01-10-2009
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Diagnosing posterolateral rotatory instability (PLRI) is difficult because it occurs rarely, takes time to manifest, and no single definitive tool exists in diagnosing posterolateral corner injuries. We sought to evaluate the correlation between rotational degrees in the dial test and physical and arthroscopic findings that surgically verified PLRI in the knee joint. Patients (n = 67) who were diagnosed as having PLRI and received posterolateral reconstruction (n = 57) and repair (n = 10) from 1998 to 2006 were recruited. Preoperative physical findings were evaluated under anesthesia, and arthroscopic findings during surgeries were analyzed. A dial test with post-anesthesia (spinal or general) was conducted. We divided patients into three subgroups (A: <15 degrees, B: 15-20 degrees, and C: >20 degrees), according to differences in rotational degrees in the dial test. All tests showed significant differences among the three groups and positive findings increased as the rotational degrees increased. No test showed a statistically significant difference in the specific group. All tests except for popliteal hiatus widening showed significant differences among the three groups and positive findings also increased as the rotational degrees increased. The total incidence and positive rate of each physical examination and the popliteal hiatus arthroscopic findings in PLRI significantly increased as the rotational degree in the dial test increased. The number of positive findings on physical examination was larger than the number of positive findings by arthroscopy in all three groups.
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Reversible and cyclical transformations between solid and hollow nanostructures in confined reactions of manganese oxide and silica within nanosized spheres.
J. Am. Chem. Soc.
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Annealing of MnO@SiO(2) nanospheres in a reducing gas environment resulted in the transformation of the core-shell structure into a hollow structure as a result of outward diffusion of MnO species into the thermodynamically more stable silicate phase. When the hollow silicate nanospheres were oxidized, the interior cavities were refilled with a Mn(3)O(4) phase segregated from the silicate phase, and the hollow structure reverted to the initial core-shell structure. More interestingly, when catalytically active Pt nanocrystals were introduced into the manganese oxide/silica system, the Mn(3)O(4) was readily reduced to the chemically reactive MnO, even at low temperature, which enabled reconversion of the solid nanospheres with a Mn(3)O(4) core to hollow nanostructures during reductive annealing. Therefore, when MnO@SiO(2)/Pt(II) nanospheres were subjected to an oxidation/reduction cycle by repeatedly switching the flowing gas between air and hydrogen, the nanospheres underwent a reversible change between solid and hollow structures, depending on the gas environment. The solid-to-hollow-to-solid transformation was successfully cycled many times simply by repeatedly switching the flowing gas during annealing.
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Arthroscopic inside-out repair of complete radial tears of the meniscus with a fibrin clot.
Knee Surg Sports Traumatol Arthrosc
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To report on the results of 12 complete radial tears of the meniscus treated using arthroscopic inside-out repair with fibrin clots, the results showed good meniscal healing and excellent clinical outcomes.
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What symptoms are more important for korean patients in knee osteoarthritis? Development and validation of the korean knee score.
Knee Surg Relat Res
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The purpose of this study was to develop and validate a novel knee evaluation instrument, the Korean Knee Score (KKS), to reflect a floor life style with high knee flexion. In addition, we aimed to assess the importance of high knee flexion activity for Korean patients.
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The tips and pitfalls of meniscus allograft transplantation.
Knee Surg Relat Res
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When faced with an irrepairable meniscus or a patient who has had a total or subtotal meniscectomy, meniscus allograft transplantation (MAT) is the preferred modality to restore biomechanical function of the meniscus. The indications for meniscus allograft transplantation are yet to be established. However, currently, MAT has previously been indicated for symptomatic patients who have mild or early osteoarthritis, are younger than 50 years of age, and present with an Outerbridge grade II or lower. The short- to intermediate-term results confirmed noteworthy clinical improvements and consistent objective findings. On the other hand, the successful outcome would be reduced by various complications. Therefore, long-term observation required to evaluate the longevity of these results. The purpose of this article is to review the current research of concerns on the results of MAT, and to describe the technical tips and pitfalls so as to successful clinical results.
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Tibiofemoral contact mechanics following posterior root of medial meniscus tear, repair, meniscectomy, and allograft transplantation.
Knee Surg Sports Traumatol Arthrosc
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The purposes of this study were to evaluate the effect on tibiofemoral contact mechanics of repair of the posterior root of the medial meniscus and the effect of meniscal allograft transplantation (MAT) with medial collateral ligament (MCL) release at different flexion angles.
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Correlation between Hamstring Flexor Power Restoration and Functional Performance Test: 2-Year Follow-Up after ACL Reconstruction Using Hamstring Autograft.
Knee Surg Relat Res
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To evaluate the restoration of the flexor power and the correlation between the flexor power and functional performance tests (FPTs) after anterior cruciate ligament (ACL) reconstruction with hamstring autograft.
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Validation of functional performance tests after anterior cruciate ligament reconstruction.
Knee Surg Relat Res
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To validate the functional performance tests (FPTs) after anterior cruciate ligament (ACL) reconstruction.
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Meniscus root refixation technique using a modified Mason-Allen stitch.
Knee Surg Sports Traumatol Arthrosc
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A complete posterior medial meniscus root tear results in the inability to withstand hoop stress and requires the repair of the posterior medial meniscus root. Several techniques to repair the posterior medial meniscus root have been proposed, but most techniques are based on simple stitching. A modified Mason-Allen technique, recognized as a superior stitching method to repair rotator cuff in shoulder surgery, was applied to overcome the potential weakness of those simple stitching techniques. This newly modified Mason-Allen technique reproduces the locking effect of a conventional modified Mason-Allen stitch allowing the physiological meniscal extrusion. The purpose of this article is to describe a posterior root repair technique using a modified Mason-Allen stitch with two strands consisting of a simple horizontal and a simple vertical stitch. Level of evidence V.
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Influence of knee flexion and femoral cross-pin insertion angle on posterolateral structures of the knee and lateral fixation lengths during ACL reconstruction.
Surg Radiol Anat
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Some studies have investigated knee flexion angle on the sagittal plane and insertion angle of the cross-pin on the coronal plane to evaluate proper femoral fixation. They evaluated the possibilities of injury to the posterolateral (PL) and neurovascular structures using several methods. The purposes of this study were to evaluate (1) the influence of knee flexion and femoral cross-pin insertion angles on knee PL structures and (2) the lateral fixation length of the cross-pin.
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What is Visualize?

JoVE Visualize is a tool created to match the last 5 years of PubMed publications to methods in JoVE's video library.

How does it work?

We use abstracts found on PubMed and match them to JoVE videos to create a list of 10 to 30 related methods videos.

Video X seems to be unrelated to Abstract Y...

In developing our video relationships, we compare around 5 million PubMed articles to our library of over 4,500 methods videos. In some cases the language used in the PubMed abstracts makes matching that content to a JoVE video difficult. In other cases, there happens not to be any content in our video library that is relevant to the topic of a given abstract. In these cases, our algorithms are trying their best to display videos with relevant content, which can sometimes result in matched videos with only a slight relation.