title: Rapid acetabular osteolysis secondary to subchondral insufficiency fracture.
abstract: 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).
authors.affiliation: Department of Orthopaedic Pathology and Department of Radiology, Hospital for Special Surgery, New York, New York 10021, USA.
authors.forename: Takuaki
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Robert
authors.initials: R
authors.lastname: Schneider
authors.forename: Yukihide
authors.initials: Y
authors.lastname: Iwamoto
authors.forename: Peter G
authors.initials: PG
authors.lastname: Bullough
mesh_terms: D000077:Acetabulum / Q000293:injuries / Q000473:pathology*; D000369:Aged, 80 and over; D005270:Femur Head / Q000473:pathology*; D015775:Fractures, Stress / Q000150:complications*; D006651:Histocytochemistry; D006801:Humans; D008297:Male; D010014:Osteolysis / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology; D011859:Radiography