title: Ischemic necrosis of the entire femoral head and rapidly destructive hip disease: potential causative relationship.
abstract: OBJECTIVE
  Rapidly destructive hip disease (RDHD) is an uncommon disorder of the hip that has been considered a disease of unknown cause and distinct from ischemic necrosis of the femoral head. The objective of this study was to investigate ischemic necrosis of the femoral head as one potential cause of RDHD.
  
  
  METHODS
  In 600 patients who underwent MR imaging of the hip, 20 cases of ischemic necrosis involving the entire femoral head in 18 patients (3%) were retrospectively studied with routine radiography and MR imaging. All patients had surgically confirmed ischemic necrosis of the femoral head.
  
  
  CONCLUSIONS
  All patients showed rapid destruction of the femoral head on routine radiography and MR imaging as compared with the gradual onset of clinical symptoms. Plain radiographs showed several bone fragments at the inferomedial aspect of the femoral head (75%), acetabular erosions (55%), eccentric depression at the lateral articular surface of the femoral head conforming to the adjacent acetabulum (35%), and mild osteoarthritis (15%). Bone sclerosis was often present at sites of impaction between the femoral head and the acetabulum. MR imaging showed marked distention of the joint capsule in all cases. In 14 of 20 cases, the contents of the joint space showed predominantly low or intermediate signal intensity on T1- and T2-weighted images. Ischemic necrosis involving the entire femoral head may represent one of the causes of RDHD.
authors.affiliation: Department of Diagnostic Radiology, Kyung Hee University Hospital, Seoul, Korea.
authors.forename: K N
authors.initials: KN
authors.lastname: Ryu
authors.forename: E J
authors.initials: EJ
authors.lastname: Kim
authors.forename: M C
authors.initials: MC
authors.lastname: Yoo
authors.forename: Y K
authors.initials: YK
authors.lastname: Park
authors.forename: D J
authors.initials: DJ
authors.lastname: Sartoris
authors.forename: D
authors.initials: D
authors.lastname: Resnick
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005271:Femur Head Necrosis / Q000150:complications* / Q000175:diagnosis; D006621:Hip Joint / Q000473:pathology*; D006801:Humans; D007511:Ischemia; D007592:Joint Diseases / Q000175:diagnosis / Q000209:etiology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies