The transverse abdominis, a deep muscle forms a containing hoop structure around the entire abdomen with the anterior of the hoop composed of the abdominal fascia and the posterior composed of the lumbodorsal fascia. This hoop structure, together with the multifidus, deep muscle packed against the spine and consisting of a characteristic laminar arraingement, provides the stability of the spine. Deepmuscle exercise attempts a synchronous contraction of both multifidus and transverse abdominis to increase spine's stability. It can thus be concluded that deep muscle exercise is almost a radical therapy for unstable lumbar disorders. In addition, our study of the deep muscle exercise for unstable lumbar disorders showed a good clinical efficacy. Conseqently we may cocider that therapeutic exercise for lower back pain acts directly on the cause of the pain and is almost a radical therapy. Therefore a suitable exercise can be applied for each cause of lower back pain. A doctor shoud try to ascertain the feasibility and limits of efficacy for each cause of pain, and make them clear to the patient before prescribing exercise.
