A podiatrist is a physician who specializes in the medical and surgical care of the foot and ankle. Podiatrists treat all conditions involving the foot, ankle, and sometimes lower leg, including bone deformities, skin and nail conditions, nerve diseases, fractures, sports injuries, and diabetic foot problems. Podiatrists are generally recognized as the experts on foot and ankle conditions and treatment, and also have extensive training in biomechanics, the study of how foot structure and function leads to injury.