We report the MR findings in three cases of osteonecrosis. Two cases w
ere post-traumatic and the third idiopathic. The diagnosis, localizati
on and characterization of osteonecrosis was improved in all patients
by the use of Gadolinium-DTPA-enhanced, fat-saturated, T1-weighted spi
n-echo imaging. We recommend the use of Gadolinium-DTPA-enhanced MRI i
n selective cases of osteonecrosis as it can better define the stage o
f disease and suitability for surgery.