Fergusson C, Burge P
Clin Orthop Relat Res. 1986 May(206):233-5.
In a 30-year-old man, the movement of a loose body between the knee joint and a popliteal cyst caused difficulty in locating the loose body. The first roentgenogram showed a posteromedial opacity, which was thought to be a sesamoid. On a subsequent film, a loose body appeared in the intercondylar notch and the posteromedial opacity was absent. At arthroscopy, the loose body could not be found within the joint and a peroperative radiograph showed that the opacity had returned to its original position. The loose body was visualized with the arthroscope inserted via a posteromedial portal and passed into the popliteal cyst. After manipulation of the loose body into the posteromedial compartment, it was removed via arthrotomy. The possibility that a loose body may lie in a popliteal cyst should be considered if all other attempts have failed to locate it.
在一名30岁男性中，一个游离体在膝关节和腘窝囊肿之间移动，导致难以确定游离体的位置。第一张X线片显示后内侧有不透明影，被认为是籽骨。在随后的一张片子上，髁间切迹出现了一个游离体，而后内侧的不透明影消失了。关节镜检查时，在关节内未发现游离体，术中X线片显示不透明影已回到其原始位置。通过后内侧入路插入关节镜并进入腘窝囊肿后，游离体被看到了。将游离体操作到后内侧间室后，通过关节切开术将其取出。如果所有其他定位游离体的尝试均失败，则应考虑游离体可能位于腘窝囊肿中的可能性。
