The eligibility criteria is subject's between 12 and 18 years, if supracondylar/periarticular humerus fracture needed operative fixation, and the fracture is unable to be treated with percutaneous skeletal fixation. Patients will be excluded if they have had a previous elbow injury, Osteogenesis imperfecta or another fragile bone disease, elbow stiffness from another cause, or any pre-existing arm weakness.