Abstract
In the total knee arthroplasty (TKA), kinematic benefits of the cruciate retaining (CR) mobile-bearing total knee arthroplasty are important. The current study aimed to assess how kinematic features of the anterior-posterior glide CR mobile-bearing TKA are different from those of normal knees or CR fixed-bearing TKA. Using a 3D/2D registration method, CT-derived 3D knee models were registered to sequential 2D X-ray images taken during knee flexion. Full range of knee flexion was 127.6° (SD 5.9) for normal knees, which was always larger than 110.8° (SD 14.0) of Nexgen CR fixed-bearing TKA or 108.1° (SD 8.0) of e.Motion CR mobile-bearing TKA. The rotation path of e.Motion CR mobile-bearing TKA demonstrated a small amount of internal or external femoral rotation from full extension over 40° flexion, steep increase in external femoral rotation from 40° to 90° flexion, then turned down in external rotation from 90° to full flexion. In contrast, Nexgen CR fixedbearing TKA did not demonstrate any consistent kinematic pattern among subjects. e.Motion CR mobile-bearing TKA can be more preferable because it showed a rotational turning point at 90° flexion that was comparable to normal knees’ rotational turning point at 80° flexion.
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