There is more than one type of doctor that treats pain in the leg or knee area including an orthopedist, an internist, a rheumatologist or a pain management specialist, notes HealthPages. Knee pain that must be treated with surgery requires an orthopedic surgeon for knee replacement or knee arthroscopy.
An orthopedist treats many conditions that affect the skeletal system and most often specializes in a certain part of the body, such as the foot or knee, states HealthPages. An internist focuses on diagnosing and treating health problems that do not require surgical intervention. A rheumatologist focuses on treating diseases of the joints such as arthritis, fibromyalgia and some sports injuries. A pain management specialist helps treat pain that lasts more than three months. This may include massage, medications and physical therapy.