Physical Medicine & Rehabilitation: (PM&R),or physiatry is a branch of medicine which aims to enhance and restore functional ability and quality of life to those with physical impairments or disabilities. A physician who has completed training in this field is referred to as a physiatrist. In order to be a physiatrist in the United States, one must complete four years of medical school, one year of internship and three years of residency. Physiatrists specialize in restoring optimal function to people with injuries to the muscles, bones, tissues, and nervous system (such as stroke patients).