Ct reads that bone spur of l5/s1 facet joint is just in contact with s1 nerve root sleeve. could that cause pain?

Yes: Compression of the s1 nerve root can commonly cause nerve pain that radiates along the outside/back of the thigh all the way down to the outside of the foot on top and bottom. If you have symptoms, see an orthopaedic surgeon, physical medicine ; rehab doc or someone in pain management for evaluation and treatment. Physical therapy, epidural steroid injections and medications to start.

Sciatica: Pain in the distribution as you suggested describes the pattern of the nerve that travels in the leg called the sciatic nerve. The sciatic nerve is not the cause of the pain source, it is the result of an irritated nerve typically in the lumbar spine (low back) which are caused by herniated disks, spinal stenosis or degenerative disc disease requiring further evaluation by a spine specialist.