In Vivo Kinematic Comparison of a Bicruciate Stabilized Total Knee Arthroplasty and the Normal Knee Using Fluoroscopy.

摘要: Abstract Background The bicruciate stabilized (BCS) total knee arthroplasty (TKA) features asymmetrical bearing geometry and dual substitution for the anterior cruciate ligament posterior (PCL). Previous TKA designs have not fully replicated normal motion, they are characterized by lower magnitudes of overall rollback axial rotation than knee. Methods In vivo kinematics were derived 10 knees 40-second generation BCS TKAs all implanted a single surgeon. Mobile fluoroscopy three-dimensional-to-two-dimensional registration was used to analyze anterior-posterior motion femoral condyles femorotibial during weight-bearing flexion. Statistical analysis conducted at 95% confidence level. Results From 0° 30° flexion, subjects exhibited similar patterns compared subjects. 60° experienced negligible motions while continued externally rotate. Between 90° resumed and, after 90°, increased in normal-like fashion. Conclusion Similarities early flexion suggest that cam-post is supporting Likewise, lateral external femur later provides evidence appropriate PCL via cam-post. Being discrete nature, mechanism does lend itself adequate ligaments mid-flexion which tension decreasing increasing