J Back Musculoskelet Rehabil. 2021;34(4):589-595. doi: 10.3233/BMR-200110.
The screw-home mechanism (SHM) plays an important role in the stability of the knee. Accordingly, the analysis of tibial rotation patterns can be used to elucidate the effect of SHM-related factors.
The purpose of this study was to compare the magnitude of the angle and the pattern of SHM between passive and active movements.
We studied twenty healthy males, of which the angle of knee flexion-extension and tibial longitudinal rotation (TLR) during active and passive movements were measured using the inertial measurement unit. Student's t-tests were used to compare the magnitude of TLR. The waveform similarity was quantified using a coefficient of multiple correlation (CMC).
Significant differences were found in the TLR between the active and passive movements (p< 0.05). The knee flexion-extension waveform similarity was excellent (CMC = 0.956). However, the waveform similarity of TLR was weak (CMC = 0.629).
The SHM increased abruptly during the last 20∘ of the active (extension) movement compared with passive extension. The SHM occurred mainly owing to the geometry and shape of the articular surfaces of the knee joint. In addition, muscle contraction was considered to be an important factor in the articulation movement.
旋内机制（SHM）在膝关节稳定性中起着重要作用。因此，分析胫骨旋转模式可用于阐明 SHM 相关因素的影响。
本研究旨在比较主动和被动运动时 SHM 的角度大小和模式。
我们研究了 20 名健康男性，使用惯性测量单元测量了主动和被动运动时膝关节屈伸和胫骨纵向旋转（TLR）的角度。使用学生 t 检验比较 TLR 的大小。使用复相关系数（CMC）量化波形相似度。
主动和被动运动时 TLR 存在显著差异（p<0.05）。膝关节屈伸波形相似度极好（CMC=0.956）。然而，TLR 的波形相似度较弱（CMC=0.629）。
与被动伸展相比，主动（伸展）运动的最后 20°时 SHM 急剧增加。SHM 主要归因于膝关节关节面的几何形状和形状。此外，肌肉收缩被认为是关节运动的一个重要因素。
