Verdini Federica, Zara Claudio, Leo Tommaso, Mengarelli Alessandro, Cardarelli Stefano, Innocenti Bernardo
Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy.
Casa di Cura Stella Maris, San Benedetto del Tronto, Italy.
Muscles Ligaments Tendons J. 2018 Jan 10;7(3):514-523. doi: 10.11138/mltj/2017.7.3.514. eCollection 2017 Jul-Sep.
In this paper, squat named by Authors because performed without constrains related to feet position, speed, knee maximum angle to be reached, was tested as motor task revealing differences in functional performance after knee arthroplasty. It involves large joints ranges of motion, does not compromise joint safety and requires accurate control strategies to maintain balance.
Motion capture techniques were used to study squat on a healthy control group (CTR) and on three groups, each characterised by a specific knee arthroplasty design: a Total Knee Arthroplasty (TKA), a Mobile Bearing and a Fixed Bearing Unicompartmental Knee Arthroplasty (respectively MBUA and FBUA). Squat was analysed during descent, maintenance and ascent phase and described by speed, angular kinematics of lower and upper body, the Center of Pressure (CoP) trajectory and muscle activation timing of quadriceps and biceps femoris.
Compared to CTR, for TKA and MBUA knee maximum flexion was lower, vertical speed during descent and ascent reduced and the duration of whole movement was longer. CoP mean distance was higher for all arthroplasty groups during descent as higher was, CoP mean velocity for MBUA and TKA during ascent and descent.
Unconstrained squat is able to reveal differences in the functional performance among control and arthroplasty groups and between different arthroplasty designs. Considering the similarity index calculated for the variables showing statistically significance, FBUA performance appears to be closest to that of the CTR group.
III a.
在本文中，作者将深蹲命名为无足部位置、速度、膝关节最大伸展角度等限制条件下进行的动作，并将其作为一项运动任务进行测试，以揭示膝关节置换术后功能表现的差异。它涉及大关节的运动范围，不会损害关节安全，并且需要精确的控制策略来维持平衡。
采用运动捕捉技术对一个健康对照组（CTR）以及三组分别采用特定膝关节置换设计的患者进行深蹲研究：全膝关节置换术（TKA）、活动平台和固定平台单髁膝关节置换术（分别为MBUA和FBUA）。在深蹲的下降、维持和上升阶段对其进行分析，并通过速度、上下身的角运动学、压力中心（CoP）轨迹以及股四头肌和股二头肌的肌肉激活时间来描述。
与CTR组相比，TKA组和MBUA组的膝关节最大屈曲度较低，下降和上升过程中的垂直速度降低，整个动作的持续时间更长。在下降阶段，所有置换组的CoP平均距离更高，在上升和下降阶段，MBUA组和TKA组的CoP平均速度更高。
无限制深蹲能够揭示对照组与置换组之间以及不同置换设计之间功能表现的差异。考虑到对具有统计学意义的变量计算的相似性指数，FBUA组的表现似乎最接近CTR组。
III a。
