Rehabilitation aims to facilitate recovery from loss of function and reduce pain. Loss of function may result from diverse conditions, including traumatic injuries (eg, fracture , limb amputation ), neurologic disorders (eg, stroke , spinal cord injury , traumatic brain injury) , sports injuries (eg, sprains, tendon ruptures), or other musculoskeletal conditions (eg, osteoarthritis) . Loss of function can also arise from cardiac or pulmonary disease, chronic pain , or prolonged deconditioning after some illness or surgery. Rehabilitation may involve