Bone Screw Fixation
Bone Screw Fixation - Related Videos
10:09
Adjustable Stiffness, External Fixator for the Rat Femur Osteotomy and Segmental Bone Defect Models
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Cited by 19 •
2014
One constraint of preclinical research in the field of bone repair is the lack of experimental control over the local mechanical environment within a healing bone lesion. We report the design and use of an external fixator for bone repair with the ability to change fixator stiffness in vivo.
05:57
A Teleoperated Robotic System-Assisted Percutaneous Transiliac-Transsacral Screw Fixation Technique
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Cited by 2 •
2023
Teleoperated robotic system-assisted percutaneous transiliac-transsacral screw fixation is a feasible technique. Screw channels can be implemented with high accuracy owing to the excellent freedom of movement and stability of the robotic arms.
12:25
C-arm-Free Simultaneous OLIF51 and Percutaneous Pedicle Screw Fixation in a Single Lateral Position
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Cited by 5 •
2022
C-arm-free oblique lumbar interbody fusion at the L5-S1 level (OLIF51) and simultaneous pedicle screw fixation are performed in a lateral position under navigation guidance. This technique does not expose the surgeon or operating staff to radiation hazards.
07:41
An Intramedullary Locking Nail for Standardized Fixation of Femur Osteotomies to Analyze Normal and Defective Bone Healing in Mice
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Cited by 10 •
2016
This protocol describes an osteosynthesis technique using an intramedullary locking nail for standardized fixation of femur osteotomies, which can be used to analyze normal and defective bone healing in mice.
01:21
Screw: Problem Solving
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2023
In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided. To evaluate the...
FAQs
Mechanical stability comes from two related actions: screw threads engage surrounding bone or tissue to resist movement, while tightening can draw a fracture or reconstructed region together and generate compression. That compression helps maintain contact and alignment under mechanical loading. When a plate, rod, or graft is present, the screw also holds that implant against bone, extending fixation beyond the screw alone.
Size and trajectory must be matched to the target bone and nearby anatomy. A screw that does not provide adequate engagement may fail to offer reliable support, whereas an unsuitable path can threaten the brain, spinal cord, nerve roots, or blood vessels. Placement therefore balances mechanical requirements with anatomical clearance, rather than treating strength as the only design objective.
Compression and implant retention are complementary but not identical functions. Across a fracture or joint, screw placement can bring bone surfaces or reconstructed regions together. In plate, rod, or graft constructs, the screw primarily secures the implanted component against bone so the construct can help maintain alignment. Recognizing the intended function guides selection of screw size and placement.
Planning begins by identifying whether fixation must cross a fracture or joint, support a reconstructed region, or secure a plate, rod, or graft. The surgeon then selects screw size and trajectory to achieve engagement and the intended compression or implant retention. Placement is planned around the brain, spinal cord, nerve roots, and vessels so mechanical support does not create avoidable neural or vascular injury.
In cranial reconstruction, fixation helps restore stability while protecting structures affected by the procedure. In spinal procedures, it can support correction of deformity and preserve a stable framework around the spinal cord and nerve roots. The same mechanical principles apply in both settings, but the relevant anatomical hazards differ, making trajectory and placement especially important in each neural context.
The intended result is not simply that screws remain in bone. Successful fixation should maintain alignment or reconstructed stability while resisting movement and loading during healing. In neurosurgical settings, evaluation also includes whether placement avoids injury to the brain, spinal cord, nerve roots, and nearby blood vessels. Mechanical performance and protection of neural anatomy therefore must be considered together.