Hi,

With all due respect, if there is a Xray showing a pars defect causing the anterolithesis, then DO NOT MANIPULATE. The person can be considered to have spinal instability. The disc would be the only structure providing a physical barrier to rotation.

If it is a degenerative anterolithesis - that is no pars defect, then that is a different matter.

UNlikely to be a big disc bulge or protrusion since there seems to be investigations such as CT or Wikipedia reference-linkMRI already done. More likely to be annular compromise leading to chemical sensitisation of the nerve roots if the source of the symptoms is disc or nerve root irritation.

Don't forget his Wikipedia reference-linkSIJ...