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首页> 外文期刊>Journal of orthopaedic research >Lengthening the moment arm of the patella confers enhanced extensor mechanism power following total knee arthroplasty
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Lengthening the moment arm of the patella confers enhanced extensor mechanism power following total knee arthroplasty

机译：全膝关节置换术后，延长the骨的力矩臂可增强伸伸肌力量

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摘要

We investigated whether a postulated biomechanical advantage conferred to the extensor mechanism by a change in knee implant design was detectable in patients by direct physical testing. 212 TKA patients were enrolled in a double blind randomized controlled trial to receive either a traditional implant or one which incorporated new design features. Extensor mechanism power output and physical performance on a battery of timed functional activities was assessed pre-operatively and then at 6, 26, and 52 weeks post-operatively. Significantly enhanced power output was observed in both groups post-arthroplasty; however, the new design implant group demonstrated a greater change in power output than the traditional implant group. Posthoc testing of between group differences highlighted greater improvement at all post-operative assessments. At 52 weeks, patients receiving the implant with the postulated biomechanical advantage achieved 116% of the power output of their contralateral limb, whereas patients with the traditional design achieved 90%. No between group difference was detected in the patient's time to complete functional tasks. Thus, patients receiving a knee implant of a modern design (theoretically able to confer a mechanical advantage to the extensor mechanism) were found to generate significantly greater extensor power than those receiving a traditional implant without the postulated mechanical advantage.
机译：我们调查了通过直接物理测试在患者中是否可以检测出通过改变膝关节植入物设计而赋予伸肌机制的假定生物力学优势。 212名TKA患者参加了一项双盲随机对照试验，以接受传统植入物或具有新设计特征的植入物。术前，然后在术后6、26和52周评估了一系列定时功能活动中的伸肌机构动力输出和身体机能。两组在置换后均观察到功率输出明显增强;但是，新设计的植入物组显示出比传统植入物组更大的功率输出变化。组间差异的事后检验强调了所有术后评估的改善。在第52周时，接受具有假想生物力学优势的植入物的患者获得其对侧肢体功率输出的116％，而采用传统设计的患者获得90％。在完成功能任务的时间上未检测到组间差异。因此，发现接受现代设计的膝关节植入物（理论上能够赋予伸张机构机械性能优势）的患者产生的伸肌力量比没有假定的机械优势的接受传统植入物的患者更大。

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