AbstractThis 46 year old female sustained a right humeral Holstein fracture without radial nerve complications related to a ski fall. She also sustained a left spinal accessory nerve traction injury which was undiagnosed until six weeks post-fracture. There was significant denervation of the left upper, middle and lower trapezius muscles. With reinnervation, she achieved muscle strength grades ranging from poor to good minus seven months after the injury. Eight months post fracture with spinal accessory nerve involvement, she functionally resumed skiing without any limitations. One year after the skiing accident, muscle strength grades ranged from poor (upper trapezius muscle) to good (middle and lower trapezius muscles).