Transient osteoporosis of the hip

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[edit] Discussion of Transient osteoporosis of the hip

  • Transient osteoporosis of the hip typically occurs in middle-aged men or in women in the third trimester of pregnancy.
  • There is spontaneous onset of pain, usually progressive over several weeks.
  • Patients generally do not have risk factors for avascular necrosis and do not go on to form avascular necrosis.
  • Clinical improvement occurs over several weeks to months without specific treatment.
  • Some patients later develop similar changes in the opposite hip or in other joints, in which case the term regional migratory osteoporosis may be used.

[edit] Imaging Findings for Transient osteoporosis of the hip

  • Plain radiographs may show normal findings early, but within several weeks (usually 4-8), patients develop variable, often profound osteopenia of the femoral head and neck region.
  • The joint space is always preserved.
  • There is a striking loss of the subchondral cortex of the femoral head, which is virtually pathognomonic for transient osteoporosis.

  • Skeletal scintigraphy shows markedly increased homogeneous uptake in the femoral head.
  • Scintigraphic findings are positive before osteopenia is seen on radiographs.

  • MR imaging in cases of transient osteoporosis shows a diffuse bone marrow edema pattern involving the femoral head, neck, and sometimes intertrochanteric region.
  • The signal intensity changes are frequently heterogeneous, particularly on T2- weighted images.

[edit] Images

Patient #1: Radiograph, bone scan, and MRI images of a patient with right transient osteoporosis of the hip

[edit] See Also

[edit] External Links

[edit] References for Transient osteoporosis of the hip