Patients seeking an initial outpatient physical therapy evaluation for non-surgical shoulder impingement with pain, who own iPhones with iOS 8 or later. Patients will be randomized into the study group or the control group, and be seen at least once per week by their physical therapist for the duration of the therapy episode, or up to 12 weeks. The study group will be asked to strap to their wrist a small, measurement device and download a smartphone application. The App communicates with the wearable device and reminds them to complete their therapy and provides patients visual instruction, feedback on exercise quality, and exercise count for the prescribed physical therapy. The control group will only have traditional in-clinic therapy as deemed clinically necessary by the PT.
