Skin necrosis following knee surgery: local status of a 72-year-old male with skin necrosis 21 days after the revision of a knee arthroplasty (lateral approach). See the multiple scar and white discoloration of the skin in area healed by secondary intention relative to previous superficial necroses. From an anterior (panel A, B and C) and lateral (Panel D, E, F) views, schematic representation of scar (white dotted line), necrosis area (black area) and area healed by secondary intention (hatched area) were added to the photo (panel B and E) and after subtracting the patient’s skin.