The findings of this study are consistent with the findings of previous studies in terms of improvement in pain and function following the application of stabilization exercises. Also, stabilization exercises were found to be superior to McKenzie exercises in our study, as shown by the decreases in pain and disability, which is consistent with the results of other studies. Although stabilization exercises are the most important methods in rehabilitation of low back pain disorders and in prophylaxis, the exact biological basis for the efficacy of stabilization exercises in low back pain patients is not clear yet. Several mechanisms have been proposed to describe the effects of stabilization exercises on pain. These mechanisms include reduction of load and improvement in the quality of movements following improvement in co-ordination of trunk muscles. In addition, the stabilization exercises targeted the main deep muscle affected by low back pain. As a result, deep muscle stabilizer muscles could influence by stabilization exercises in low back pain patients. Therefore, a change in muscle thickness was only seen after stabilization exercises. .