Lai K A, Shen W J, Lin C J, Lin Y T, Chen C Y, Chang K C
Department of Orthopaedics, National Cheng Kung University Medical Center, Tainan City, Taiwan.
Acta Orthop Scand. 2000 Aug;71(4):394-8. doi: 10.1080/000164700317393402.
We studied 28 patients with habitual or recurrent dislocation of the patella with MRI of both thighs. Apart from the 2 patients whose dislocation could be related to trauma, we found signs of fibrosis of the vastus lateralis muscle in all the affected limbs of the 26 patients with an insidious onset of dislocation. This was seen as low signal intensity cords in the muscles in the T2 weighted image. Muscle degeneration was seen as high intensity signals in the T1 weighted image. In patients with unilateral disease, the vastus lateralis muscle of the affected side was hypotrophic, compared to that of the normal side. 2 patients underwent a biopsy of the affected muscle area. Histopathological examination revealed inflammatory cell infiltration, fibrosis, and muscle fiber degeneration. Fibrosis of the vastus lateralis muscle appears to be common in patients with habitual patella dislocation in our population, and may be the cause of the dislocation. Since release of such a contracture may be of value, MRI study of the thigh muscles is helpful in the evaluation of patients with this disorder.
我们对28例习惯性或复发性髌骨脱位患者的双侧大腿进行了MRI检查。除了2例脱位可能与创伤有关的患者外，我们在26例隐匿性脱位患者的所有患侧肢体中均发现了股外侧肌纤维化的迹象。这在T2加权图像中表现为肌肉内的低信号条索。肌肉变性在T1加权图像中表现为高信号。在单侧患病的患者中，患侧的股外侧肌比正常侧萎缩。2例患者对患肌区域进行了活检。组织病理学检查显示有炎性细胞浸润、纤维化和肌纤维变性。在我们的研究人群中，股外侧肌纤维化在习惯性髌骨脱位患者中似乎很常见，可能是脱位的原因。由于松解这种挛缩可能有价值，因此对大腿肌肉进行MRI研究有助于评估患有这种疾病的患者。
