Do you mean his main symptom (something you feel) is gluteal pain, brought on by slump testing. I would investgate the bilateral inernal rotation of the hip joints, especially in a slumped position with the trunk in rotation towards the leg that should be internally rotating. Lack of hip internal rotation her ecould be the result of asymmetry in his obliques/lats/multifidus at EOR/transversus etc. This may have later manifested as a tight or overactive piriformis which is causing a sacral and therefore lumbar imbalance. I have found that this is common in rowers who display symptoms of discal lesions that are created from inadequacies farther afield. It is the farther afield issues that you must treat if you wish to have a longterm result. You can always sell the idea to the patient that if they fix it they won't simply reduce their pain, they will increase their performance. :-) richard