What question did this study set out to answer?

To determine whether a fixed-bearing, high-flexion posterior stabilized total knee arthroplasty system can restore intact knee kinematics and range of flexion.

August 1, 2004Journal of Bone and Joint Surgery

Knee Kinematics with a High-Flexion Posterior Stabilized Total Knee Prosthesis: An in Vitro Robotic Experimental Investigation

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Authors

GLGuoan LiXuzhou Medical College EMEphrat MostExponent (United States)PSPeter G. SultanHarvard University

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Implication

In vitro robotic study reveals high-flexion knee prostheses restore ninety percent of natural femoral translation in cadaver knees, indicating implant mechanics alone do not limit deep flexion.

Key Points

To determine whether a fixed-bearing, high-flexion posterior stabilized total knee arthroplasty system can restore intact knee kinematics and range of flexion.
Thirteen cadaveric human knees (N=13) were evaluated before and after total knee arthroplasty with an LPS-Flex prosthesis using a robotic testing system.
Posterior femoral translation of both condyles and tibial rotation were recorded from 0° to 150° of flexion under passive conditions, isolated quadriceps force (400 N), isolated hamstring force (200 N), and combined forces.
Intact knees exhibited peak posterior femoral translation under combined forces of 22.9 ± 11.3 mm for the medial condyle and 31.9 ± 12.5 mm for the lateral condyle, with the knee replacement recovering approximately 90% of this translation at 150°.
The prosthetic cam-spine mechanism engaged at approximately 80° and disengaged at 135°, although additional posterior femoral translation still occurred between 135° and 150°.

Cite This Study

Li et al. (2004) studied this question.

synapsesocial.com/papers/6a79259f0e5708f2dd6765da https://doi.org/10.2106/00004623-200408000-00017

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Implication

In vitro robotic study reveals high-flexion knee prostheses restore ninety percent of natural femoral translation in cadaver knees, indicating implant mechanics alone do not limit deep flexion.

Knee Kinematics with a High-Flexion Posterior Stabilized Total Knee Prosthesis: An in Vitro Robotic Experimental Investigation

Discussion

Member takes

Implication

Key Points

Cite This Study

Knee Kinematics with a High-Flexion Posterior Stabilized Total Knee Prosthesis: An in Vitro Robotic Experimental Investigation

Discussion

Member takes

Implication

Key Points

Cite This Study

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