People who have had a knee or hip replacement reap the benefits of intense rehab months after they've returned home, according to a new analysis. "If you can get patients to a certain threshold level, they can do the rest of the rehabilitation on their own," coauthor Kenneth Ottenbacher told Reuters Health. "In a sense, these patients become their own physical therapists," he said. Ottenbacher directs the Center for Rehabilitation Sciences at UTMB.