关节游离体在膝或肘等关节内，某些压力骨骺的凸面可在外力反复作用下发生缺血性坏死、剥脱，在关节内游离，称为剥脱性骨软骨炎（关节游离体）。另外，游离体上滑膜化生，可形成软骨细胞或骨细胞继续生长。游离体在关节内活动，也称为关节鼠。
目的探讨小切口摘除膝关节游离体的治疗方法和疗效。
Objective To investigate the method and effect of removal of intraarticular free body of knee through small incision.
结果术前高频超声提示正确率为81。 6% （31 /38），其中包括半月板损伤18例、关节内游离体7例及滑膜病变6例。
Results The diagnostic accuracy of high frequency ultrasound was 81.6% (31/38), including 18 cases of meniscal tear, 7 cases of loose body and 6 cases of synovial lesions.
CT可区分高密度影是关节腔游离体还是软组织内钙化或关节囊钙化。
CT can differentiate freebodys in the joint cavity with the calcification of the soft tissue or joint sac.
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