Patients and healthy participants will undergo an interview at the beginning of the study and 1,3,6,9, 12, 18 and 24 months and answer questions about their medical history; family history; current problem and treatment; pain history; and social, physical and recreational activities. At the visit, they will also undergo an upper body physical exam by a physical therapist. Patients and the healthy participants will also fill out questionnaires about arm disability, quality of life, and physical activity at the beginning of the study and at 12, 18, and 24 months.
