In many cases effective treatment ( by mobilising L4 unillateraly till protective paravertebral tone is normalised ) at the lumbar spine will eliminate the so called piriformis syndrome without attention to lateral thigh structures at all. In the light of these changes it can be said that many times the symptoms felt at the lateral thigh ( including the oft misunderstood ITB ) were entirely referred , rather than the result of some misbehaviour of the pirifrmis muscle.