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Gait analysis of fixed bearing and mobile bearing total knee prostheses during walking: Do mobile bearings offer functional advantages?

机译:行走过程中固定轴承和活动轴承全膝假体的步态分析:活动轴承是否具有功能优势?

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摘要

Background - Limited previous findings have detailed biomechanical advantages following implantation with mobile bearing (MB) prostheses after total knee replacement (TKR) surgery during walking. The aim of this study was to compare three dimensional spatiotemporal, kinematic, and kinetic parameters during walking to examine whether MBs offer functional advantages over fixed bearing (FB) designs.\ud\udMethods - Sixteen patients undergoing primary unilateral TKR surgery were randomised to receive either a FB (n = 8) or MB (n = 8) total knee prosthesis. Eight age and gender matched controls underwent the same protocol on one occasion. A 12 camera Vicon system integrated with four force plates was used. Patients were tested pre-surgery and nine months post-surgery.\ud\udResults - No significant differences between FB and MB groups were found at any time point in the spatiotemporal parameters. The MB group was found to have a significantly reduced frontal plane knee range of motion (ROM) at pre-surgery than the FB group (FB = 14.92 ± 4.02°; MB = 8.87 ± 4.82°), with the difference not observed post-surgery. No further significant kinematic or kinetic differences were observed between FB and MB groups. Fixed bearing and MB groups both displayed spatiotemporal, kinematic, and kinetic differences when compared to controls. Fixed bearing and MB groups differed from controls in six and five parameters at nine months post-surgery, respectively.\ud\udConclusions - No functional advantages were found in knees implanted with MB prostheses during walking, with both groups indicative of similar differences when compared to normal knee biomechanics following prosthesis implantation.
机译:背景-有限的先前发现在步行期间进行全膝关节置换(TKR)手术后植入活动轴承(MB)假体后具有详细的生物力学优势。这项研究的目的是比较步行过程中的三维时空,运动学和动力学参数,以检查MBs是否比固定轴承(FB)设计具有功能优势。\ ud \ ud方法-将16例接受原发单侧TKR手术的患者随机接受FB(n = 8)或MB(n = 8)全膝关节假体。八个年龄和性别相匹配的对照曾一次接受相同的方案。使用了带有四个测力板的12相机Vicon系统。结果:在手术前和手术后9个月对患者进行了测试。\ ud \ ud结果-FB组和MB组在任何时间点的时空参数均无显着差异。发现MB组在术前比FB组的额叶膝关节活动范围(ROM)显着减少(FB = 14.92±4.02°; MB = 8.87±4.82°),差异在术后手术。在FB和MB组之间没有观察到进一步的运动学或动力学差异。与对照组相比,固定轴承和MB组均显示出时空,运动和动力学差异。固定的轴承和MB组在术后9个月时分别在六个参数和五个参数上与对照组不同。\ ud \ ud结论-在行走过程中植入MB假体的膝盖未发现功能优势,两组相比时表明相似的差异假体植入后恢复正常的膝关节生物力学。

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