Fig. 1A-D.

Selected MR images show a female patient with a history of oral corticosteroid use. On preoperative sagittal (A) and coronal (B) T1-weighted images, the mean modified Kerboul angle was 198°. At the time of aspiration, the mean cell count was 6.25 x 10⁷ cells/mL and the mean CFUs was 29. One year postoperatively, a repeat T1-weighted MRI showed the mean modified Kerboul angle on sagittal (C) and coronal (D) images had improved to 146°. Likewise, her Harris hip score improved from 69 preoperatively to 100 postoperatively.