A, Method of stripping and advancing interosseous muscles to slacken them, allowing proximal finger joints to extend and distal two to flex. Interosseous muscles of two clefts have been stripped. Stripping of interossei is done only when muscles still retain considerable function. Nerve supply should be spared. B, Complete intrinsic tenotomy for severe intrinsic contractures in which nonfunctioning interosseous muscle remains.