Posterior Stabilized Prosthesis
Posterior Stabilized Prosthesis - Related Videos
08:08
Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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Cited by 35 •
2014
Body segmental inertial properties are required for inverse dynamics modeling. Using an oscillation and reaction board technique, inertial properties of below-knee prostheses were measured. Using direct measures of prosthesis inertia in the inverse dynamics model of the prosthetic leg resulted in lower magnitudes of resultant joint forces and moments.
11:16
Engineering Platform and Experimental Protocol for Design and Evaluation of a Neurally-controlled Powered Transfemoral Prosthesis
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Cited by 15 •
2014
Neural-machine interfaces (NMI) have been developed to identify the user's locomotion mode. These NMIs are potentially useful for neural control of powered artificial legs, but have not been fully demonstrated. This paper presented (1) our designed engineering platform for easy implementation and development of neural control for powered lower limb prostheses and (2) an experimental setup and protocol in a laboratory environment to evaluate neurally-controlled artificial legs on patients with...
08:46
A Standardized Method for Measuring Internal Lung Surface Area via Mouse Pneumonectomy and Prosthesis Implantation
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Cited by 22 •
2017
Internal lung surface area (ISA) is a critical criterion for assessing lung morphology and physiology in lung diseases and injury-induced alveolar regeneration. We describe here a standardized method that can minimize the measurement bias for ISA in both lung pneumonectomy and prosthesis implantation mouse models.
10:00
Techniques for Processing Eyes Implanted with a Retinal Prosthesis for Localized Histopathological Analysis: Part 2 Epiretinal Implants with Retinal Tacks
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Cited by 23 •
2015
Here we describe histological techniques for visualising ocular tissue directly adjacent to a metal epiretinal tack and retinal prosthesis.
03:18
Nuclear Stability
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2020
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters. To hold positively charged protons together in the...
FAQs
As the knee bends, the cam on the femoral component engages the post on the tibial insert. This interaction helps guide femoral rollback and limits excessive posterior translation of the tibia. By mechanically contributing to stability when the posterior cruciate ligament is unavailable, the design supports more predictable motion after total knee arthroplasty.
The posterior cruciate ligament contributes to knee stability and motion, so its condition influences implant selection. If it is absent, insufficient, or intentionally removed during surgery, a posterior stabilized design can replace part of its stabilizing function through the cam-and-post mechanism. This makes ligament status an important consideration in surgical planning.
The key distinction is whether the implant must mechanically substitute for the posterior cruciate ligament. A posterior stabilized prosthesis uses a femoral cam and tibial post for guidance when the PCL cannot be relied upon. A PCL-preserving approach instead depends more directly on retaining a functional ligament, making ligament sufficiency central to the comparison.
Stability and motion depend partly on whether the posterior cruciate ligament is functional, absent, or removed, because that determines the need for mechanical substitution. The interaction between the femoral cam and tibial post also contributes to guidance during flexion. These biomechanical considerations help clinicians anticipate motion and evaluate whether the implant is performing as intended.
Planning begins with assessing whether the posterior cruciate ligament can be preserved and whether it is sufficiently functional. The surgeon then considers an implant design that can provide the required stabilization, using the cam-and-post relationship to support motion when needed. This biomechanical planning is paired with postoperative assessment to evaluate stability and movement.
This implant may be considered when a patient undergoing total knee arthroplasty lacks a usable posterior cruciate ligament or when the ligament will be intentionally removed. Its mechanical linkage is intended to provide stability and predictable motion in that setting. The choice therefore connects the patient’s ligament condition with the functional demands of the replacement.
Postoperative assessment focuses on whether the replacement provides stable, predictable knee motion and whether the cam-and-post mechanism appears to support the intended biomechanics. Clinicians also remain alert for complications highlighted by the design, including instability or wear. These findings can help relate a patient’s clinical performance to implant function and surgical planning.
Its biomechanics link implant structure with clinical decision-making in knee replacement. Understanding how the femoral cam and tibial post contribute to rollback and control of posterior tibial translation supports implant selection, surgical planning, and interpretation of postoperative findings. The same framework also helps clinicians assess complications such as instability or wear.