Baugher W H, Warren R F, Marshall J L, Joseph A
Am J Sports Med. 1984 May-Jun;12(3):192-5. doi: 10.1177/036354658401200304.
Atrophy of the quadriceps musculature is frequently associated with chronic knee instability. This atrophy may persist despite the patient's ability to return to athletic competition. When open biopsies of the quadriceps muscle from unstable knees were compared with those from normal acutely injured knees, it was found that clinical evidence of atrophy correlated with a relative decrease in the size of Type II or fast twitch muscle fibers. This supports the subjective, clinical impression that the unstable knee is less effective in explosive push-off. The findings also indicate the necessity of including exercise specific for the training of Type II fast twitch fibers in any program designed to rehabilitate the injured knee.
股四头肌萎缩常与慢性膝关节不稳相关。尽管患者能够恢复体育比赛，但这种萎缩可能持续存在。当对不稳定膝关节的股四头肌进行开放活检并与正常急性损伤膝关节的股四头肌活检进行比较时，发现萎缩的临床证据与II型或快肌纤维大小的相对减少相关。这支持了一种主观的临床印象，即不稳定膝关节在爆发性蹬离动作中效率较低。这些发现还表明，在任何旨在修复受伤膝关节的康复计划中，都有必要纳入专门针对II型快肌纤维训练的运动。
