"Orthopedics" is a broad term that includes medical fields that treat illnesses and conditions related to the body's skeletal or muscular systems. Chiropractors are licensed professionals who specialize in skillfully applying pressure to the area of the spine that is out of alignment. Physical Therapists work with patients to improve mobility, relieve pain, and prevent or limit permanent physical disabilities that are due to injuries or disease. Podiatrists treat major foot and lower leg disorders. Muscle Therapy is often used as a complement to physical therapy or chiropractic treatment programs, and is usually administered by a neuromuscular therapist who has received special training in the assessment and treatment of painful muscle conditions. Tension headaches, shoulder and neck pain, and complicated back or hip pain are relieved using muscle release techniques. Orthopedic physicians in particular treat medical problems associated with the bones, joints and ligaments of the body.