Presentation
Bilateral hip pain, more on the right side. History of chronic low back pain, previous back operation 4 months ago, and long-term steroid medication.
Patient Data
Irregular abnormal signal intensities are seen in both femoral heads, which display hypointense signal intensity on T1WI and hyperintense signal intensity on T2 and STIR WI. A hyperintense line is seen in the right femoral head between the ischemic and normal bone marrow. A subchondral bone cyst and cortical irregularities are seen in the left femoral head superiorly
Case Discussion
MRI findings are consistent with avascular necrosis of both femoral heads with a stage III of the right side and stage II of the left side.