Nishino Akie, Sanada Akiko, Kanehisa Hiroaki, Fukubayashi Toru
Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Tokyo, Japan.
Med Sci Sports Exerc. 2006 Nov;38(11):1895-900. doi: 10.1249/01.mss.0000230344.71623.51.
The present study aimed to clarify the relationship between deficits in knee-flexion torque and morphological changes in the semitendinosus muscle-tendon complex after harvesting the semitendinosus tendon for anterior cruciate ligament (ACL) reconstruction.
Isometric knee-flexion torque at 45 and 90 degrees of knee flexion was measured in limbs of 23 patients (22 +/- 4 yr) who underwent unilateral ACL reconstruction (12-43 months postoperation) using ipsilateral semitendinosus tendon. Magnetic resonance imaging scans were used to calculate the muscle volume and the muscle length of the semitendinosus and to confirm the presence of the regenerated semitendinosus tendon.
The percentage of the knee-flexion torque of the ACL-reconstructed limb compared with that of the contralateral limb was lower at 90 degrees than at 45 degrees . The regeneration of the semitendinosus tendon-like structure was confirmed in 21 of the 23 patients. However, muscle volume and muscle length of the semitendinosus in the ACL-reconstructed limb were significantly smaller compared with in the contralateral limb.
Deficits in knee-flexion torque at deep knee flexion were associated with the atrophy and shortening of the semitendinosus after harvesting the semitendinosus tendon for ACL reconstruction.
本研究旨在阐明在使用半腱肌腱进行前交叉韧带（ACL）重建后，膝关节屈曲扭矩不足与半腱肌肌腱复合体形态变化之间的关系。
对23例（22±4岁）接受同侧半腱肌腱单侧重建ACL手术（术后12 - 43个月）患者的肢体，测量膝关节屈曲45度和90度时的等长膝关节屈曲扭矩。使用磁共振成像扫描计算半腱肌的肌肉体积和肌肉长度，并确认再生半腱肌腱的存在。
ACL重建肢体的膝关节屈曲扭矩与对侧肢体相比，在90度时的百分比低于45度时。23例患者中有21例确认有半腱肌腱样结构再生。然而，ACL重建肢体的半腱肌肌肉体积和肌肉长度与对侧肢体相比显著更小。
在为ACL重建而取半腱肌腱后，膝关节深度屈曲时的膝关节屈曲扭矩不足与半腱肌萎缩和缩短有关。
