Pellegrini-Stieda Syndrome Mimicking Acute Septic Arthritis

This case illustrates the potential severity of an uncommon and generally benign condition of the knee--the Pellegrini-Stieda syndrome. The regional bone scan clearly showed the etiologic role of the inflamed ligamentous attachment site. Therapy should include joint rest, nonsteroidal anti-inflammatory agents, and possibly ice for symptomatic relief.