Hello there,

Hope you have had done screening for redflags. My response, from just from wat u said is; if you could produce pain by closing a joint( spine ext)--It may well be facetal stiffness. u also need to check for muscle tightness, QL,hamstring,piriformis. Other thing, you also you want to check, if any change in position or rest eases symptoms. If it is a stenotic pain, symptoms will ease on flexed position. Exclude vascular issues.

To be honest if i was in your case, i will do PA MObs on the stiff joints and Rotn mobs if needed and give Lum FlxN EX'S as home program. I knew this is a broad statement, i am jst telling an option. My understanding about sciatic pain, is looking for interfaces, it might be bony ( stiff lumbar joints, spondlyosis, spondylisthesis) or muscle imbalances( tight muscular structures) There is no box standard answers for sciatic pain, treat as you go.. Do update how u went on.
gud luck