Knee kinematics do not influence the long-term results in posterior cruciate-retaining total knee arthroplasties

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  • 後十字靱帯温存型人工膝関節の運動様式は長期成績に影響を与えない

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The purpose of this study was to investigate the relation between long-term results and knee kinematics in the flat-on-flat CR-TKA. Sixteen knees were analyzed in the study. Fluoroscopic study of the step-up motion was done standing with the tibia at neutral, toe-in and toe-out positions relative to the femur in all implanted knees. Fluoroscopic analyses divided 16 joints into 2 kinematic groups: medial pivot, 8 and lateral pivot 8. The lateral pivot group showed anterior paradoxical movement in the toe-out position changing to the medial pivot pattern in the toe-in position, although the kinematics of the medial was not altered. In the 10-year follow-up, the average knee scores were 82.9±6.9 in cases of the lateral pivot group and 85.8±6.3 in cases of the medial pivot group. The average function scores were 59.4±14.6 in cases of the lateral pivot group and 57.0±11.6 in cases of the medial pivot group. The average flexion angles were 108.8±10.9° in case of the lateral pivot group 113.3±7.1° in case of the medial pivot group. There were no significant differences between the medial and lateral pivot groups in knee scores, function scores, and flexion angles. There were no cases of loosening or polyethylene failure.

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