Noyes F R, Wojtys E M, Marshall M T
Cincinnati Sportsmedicine Center, Deaconess Hospital, Ohio 45219.
Clin Orthop Relat Res. 1991 Apr(265):241-52.
Developmental patella infera and associated arthrofibrosis after knee surgery require prompt recognition and treatment. The condition develops because of contracture of peripatellar tissues, fatpad tissues, and quadriceps weakness, and may rapidly progress to permanent patella infera and disabling patellofemoral arthrosis. Case studies for five patients with acute developmental patella infera are described. All patients required an early arthroscopic release of contracted tissues. To establish normal right to left patellar, vertical-height ratios, lateral roentgenograms were obtained in 202 normal knees (101 pairs). The data showed that although essentially no difference existed between right and left sides, large variations existed in the ratios from one individual to another (range, 0.75-1.46). Thus, the diagnosis of developmental patella infera requires comparison of patellar height ratios in the same knee or between knees in the same individual. A decrease in the vertical-height ratio of 11%-15%, depending on the method used, indicates developmental patella infera.
膝关节手术后出现的发育性低位髌骨及相关关节纤维化需要及时识别和治疗。这种情况是由于髌周组织、脂肪垫组织挛缩以及股四头肌无力所致，可能会迅速发展为永久性低位髌骨和致残性髌股关节病。本文描述了5例急性发育性低位髌骨患者的病例研究。所有患者均需要早期关节镜下松解挛缩组织。为确定正常的左右髌骨垂直高度比值，对202例正常膝关节（101对）进行了外侧X线检查。数据显示，虽然左右侧基本无差异，但个体之间的比值差异很大（范围为0.75 - 1.46）。因此，发育性低位髌骨的诊断需要比较同一膝关节或同一个体双膝之间的髌骨高度比值。根据所使用的方法，垂直高度比值下降11% - 15%表明存在发育性低位髌骨。
