Atlas of Signs in Musculoskeletal Radiology is approved by the ARRS (American Roentgen Ray Society) and is included in AJR Webreview

A. Gentili,MD, M. Beller, MD, S. Masih, MD, L.L. Seeger, MD

Diagnosis:

Avascular Necrosis

Discussion:

One image each of two separate patients with collapse and necrosis of the femoral head, both of which are secondary to repeated injection of steroids. A rapid progression of change in a joint secondary to steroid injections. Transition of a joint from one of minor alterations(such as narrowing, sclerosis) to one of significant bony fragmentation and collapse. Gouged-out areas of bony destruction may be similar to small animal bites, hence the bite sign.

AB

References:

Atlas of Signs in Musculoskeletal Radiology is approved by the ARRS (American Roentgen Ray Society) and is included in AJR Webreview

A. Gentili,MD, M. Beller, MD, S. Masih, MD, L.L. Seeger, MD