Atypical Clinical Presentation of Rapidly Progressing Femoral Head Avascular Necrosis.

A 51-year-old man presented to an urgent care facility 2 weeks after onset of left lateral hip and buttock pain. Radiographs were noncontributory. An orthopaedist referred him to physical therapy, but due to the worsening clinical presentation, he was referred back to the orthopaedist for additional evaluation. Magnetic resonance imaging was ordered and demonstrated abnormal femoral head and acetabular contour, extensive bone marrow edema, and a complex joint effusion. He was diagnosed with femoral head avascular necrosis. J Orthop Sports Phys Ther 2017;47(3):217. doi:10.2519/jospt.2017.6483.