Thanks for the query. L4-5 disc prolapse
usually cause back pain and if there is any nerve pinching due to disc then it will cause leg pain as well. Does he have low back pain
only? any leg problems? Treatment differs in both situations. If he has significant leg pain or tingling then nerve root
block (means spine injection) may help. For back pain physiotherapy
and medicine should help. Need to see his imaging to tell you exact course of treatment.Thanks.