Masson trichrome staining (magnification, ×200) in specimens of the (A) CON, (B) ORC and (C) CNT groups. Muscle is indicated in red and collagen in green. Staining intensity of collagen was greater in every specimen of the ORC group compared with every specimen of the CON and CNT groups. CON, non-operated control; ORC, operated contracture; CNT, contracture-treatment.