Spontaneous osteo-necrosis of the knee

Case contributed by Dr Amr Farouk


35-year-old female patient diagnosed rheumatoid arthritis on corticosteroids for several years with the recent onset of severe knee pain of few weeks duration.

Patient Data

Age: 35 year old
Gender: Female

The lateral femoral condyle is showing a geographical subcortical margined area of alternating signal
intensity lesion displays low signal in T1WI with high signal peripheral signal and a central signal void area in STIR WI.

Case Discussion

MR picture of spontaneous osteonecrosis of the knee.

Previously spontaneous osteonecrosis of the knee was considered a primary osteonecrosis with no related cause, but now the presumed aetiology is being an insufficiency fracture of the subchondral bone. SONK is seen more frequently in women with osteoporosis and of older age.


PlayAdd to Share

Case information

rID: 58910
Case created: 12th Mar 2018
Last edited: 13th Mar 2018
Inclusion in quiz mode: Included

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.