Physical Therapy Assistant KeystoneCarePhysical Therapy AssistantPhiladelphia, PATreatment is aimed at relieving pain and developing or restoring muscle strength, coordination, endurance, range of motion, and motor skill consistent with the functional capacity and individual needs of each patient. The Physical Therapy Assistant is a specialist in preserving functional capacity or re-establishing function in disorders of the musculoskeletal, neuro-muscular, cardiovascular, respiratory, and integument systems.