Baseline Evaluation: Consented subjects will undergo a pre-operative assessment by a study therapist who is independent of their clinical care. The assessment will consist of 1) baseline demographics form (age, mechanism of injury, past and current medical status, work and activity demands; dominant hand), 2) work-related questions (i.e. occupation, employment status, type of work performed) 3) the Quick Disabilities of the Arm, Shoulder, and Hand questionnaire (Q-DASH), 4) visual analogue scale (VAS) for pain at rest and with activity 5) bilateral elbow ROM in the planes of supination and flexion, 6) bilateral elbow strength for flexion and supination using a handheld dynamometer (microFET3, Hoggan Health Industries Inc., West Jordan, UT), and 7) an ultrasound or MRI to confirm the diagnosis. Imaging at this pre-operative stage is standard of care, and not dependent on study involvement. All data will be collected using standardized forms and entered into a password-protected database.