Our expert says:
Just go for a physiotherapy evaluation too - this is sometimes caused by Piriformes syndrome (http://www.coccyx.org/whatisit/muscle.htm) as the other most common causes seems to be excluded now.
If the physio can't find any fault, a MR scan of the spine may be needed to exclude disc herniation which one can't see on a x/ray.
Let me know if you get any solution?
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.