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A high flexion total knee arthroplasty design replicates healthy knee motion
Jean-Noël A Argenson1, Richard D Komistek, Mohamed Mahfouz
1Aix-Marseille University, Hopital Sainte-Marguerite, Marseille, France. jean-noel.argenson@ap-hm.fr
Clinical Orthopaedics and Related Research
|November 10, 2004
Summary
High-flexion total knee replacements demonstrate similar patellofemoral motion and femorotibial kinematics to healthy knees. This suggests comparable patellar forces after knee arthroplasty, supporting the safety of deep flexion designs.
Area of Science:
- Orthopedic Surgery
- Biomechanics
- Biomedical Engineering
Background:
- Deep knee flexion impacts femorotibial contact and patellofemoral joint mechanics.
- Understanding these changes is crucial for evaluating total knee replacement (TKR) designs.
Purpose of the Study:
- To compare patellofemoral motion between non-implanted and implanted knees.
- To analyze femorotibial kinematics in patients with a TKR designed for deep flexion.
Main Methods:
- Three-dimensional patellofemoral kinematics were assessed using fluoroscopy during deep knee bends.
- Evaluated groups included healthy knees, anterior-cruciate-ligament-deficient knees, and knees with high-flexion TKR.
- Kinematic parameters such as translation, tilt, axial rotation, and femoral rollback were measured.
Main Results:
- Patients with TKR showed less translation of the patellofemoral contact position compared to healthy knees.
- Average patellar motion and tilt angles in TKR patients were similar to healthy knees.
- TKR patients exhibited an average of 4.9 degrees axial rotation and at least -4.4 mm posterior femoral rollback, with a mean range of motion of 125 degrees.
Conclusions:
- High-flexion TKR designs exhibit kinematic patterns comparable to healthy knees.
- Patellar forces are hypothesized to be not substantially increased in TKR patients versus controls.
- These findings support the kinematic similarity and potential safety of deep flexion knee arthroplasty designs.