Watanabe W, Itoi E, Sato K
Department of Orthopedic Surgery, Akita University School of Medicine, Japan.
Skeletal Radiol. 2000 Dec;29(12):726-8. doi: 10.1007/s002560000293.
Intra-articular membranous interposition was detected by MRI in the hip joint with residual subluxation of a girl aged 5 years 10 months. This structure, which had low signal intensity on both T1- and T2-weighted images, separated the femoral head from the acetabulum. Histological examination revealed chondrometaplasia, which suggested that this interposition might be transformed to a surface cartilaginous tissue of the secondary acetabulum often observed in residual subluxation of the hip.