PT  - JOURNAL ARTICLE
AU  - Takuaki Yamamoto
AU  - Robert Schneider
AU  - Yukihide Iwamoto
AU  - Peter G Bullough
TI  - Rapid acetabular osteolysis secondary to subchondral insufficiency fracture.
DP  - 2007 Mar 01
TA  - The Journal of Rheumatology
PG  - 592--595
VI  - 34
IP  - 3
4099  - http://www.jrheum.org/content/34/3/592.short
4100  - http://www.jrheum.org/content/34/3/592.full
SO  - J Rheumatol2007 Mar 01; 34
AB  - A 93-year-old man presented with a one-month history of persistent left hip pain of sudden onset. At first visit, radiographs revealed a fracture line at the medial portion of the acetabulum with no displacement. Magnetic resonance imaging revealed bone marrow edema in the corresponding medial portion of the acetabulum. Radiographs obtained 2 months later showed rapid acetabular osteolysis with associated prominent migration of the femoral head into the acetabulum. Histology obtained from the hip joint was consistent with a subchondral insufficiency fracture with no evidence of massive chondrolysis. Our case was considered as a subchondral insufficiency fracture of the left acetabulum resulting in rapid acetabular osteolysis (protrusio acetabuli).