Pyoderma gangraenosum as a complication to knee arthroscopy.

Pyoderma gangraenosum (PG) is a rare immunologic ulcerative disease, which sometimes develop as a complication to surgery. PG is often misdiagnosed as an infected wound, but treatment is completely different. We report a case of PG as a complication to arthroscopic partial meniscectomy that resulted in arthrodesis of the knee. We discuss the differential diagnosis and treatment options.