Orthopaedic medicine devotes itself to the evaluation, diagnosis and treatment of non-surgical lesions of the musculoskeletal system. For diagnosis, the doctor will take a comprehensive history, a detailed and specific physical examination, radiologic evaluations and local anesthetic blocks. To treat soft tissues, the doctor's methods will encompass manipulations, injections, and therapeutic exercise. Modern orthopaedic medicine is based upon the principles developed by Dr. Cyriax. His system has three basic points: 1) Every pain has a source. 2) Treatment must reach the source. 3) Treatment must benefit the source in order to relieve the pain. From these three basic tenets orthopaedic medicine has grown and advanced into what it is today.