Figure 27.

Septic arthritis and osteomyelitis involving the right hip in an intravenous drug user. A) Coronal T1W magnetic resonance (MR) image demon- strating extensive low T1 bone marrow signal in the proximal femur indicating osteomyelitis (arrows). Note normal bone marrow signal in the acetabulum (asterisk). B) Coronal short-tau inversion recovery MR demonstrating a large hip joint effusion with marked synovitis (large arrows) and extensive hetero- geneous abnormal signal in the proximal right femur (small arrow) indicating osteomyelitis