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In vivo knee kinematics derived using an inverse perspective technique
D A Dennis1, R D Komistek, W A Hoff
1Rose Musculoskeletal Research Laboratory, Denver, CO, USA.
Clinical Orthopaedics and Related Research
|October 1, 1996
Summary
Knee implant contact points vary significantly. Posterior cruciate retaining implants show abnormal anterior femoral translation, potentially causing premature wear.
Area of Science:
- Orthopedic surgery
- Biomechanics
- Biomedical engineering
Background:
- Understanding femorotibial contact mechanics is crucial for knee implant design.
- Previous studies have not fully elucidated the in-vivo contact patterns of different knee implant types.
Purpose of the Study:
- To analyze and compare femorotibial contact points in the sagittal plane for normal, posterior stabilized, posterior cruciate retaining, and anterior cruciate ligament-deficient knees.
Main Methods:
- Fluoroscopic videos of 64 subjects performing deep knee bends.
- Image matching and discrete digitization to determine femorotibial contact points.
- Analysis of contact locations at full extension and during flexion.
Main Results:
- Normal and posterior stabilized knees exhibit anterior contact at full extension, translating posteriorly during flexion.
- Posterior cruciate retaining and ACL-deficient knees show posterior contact at extension, with some translating anteriorly during flexion.
- Abnormal anterior femoral translation was noted in posterior cruciate retaining knees.
Conclusions:
- Femorotibial contact patterns differ significantly between knee types.
- Posterior cruciate retaining implants may experience premature polyethylene wear due to abnormal anterior femoral translation.