-1,5 years ago you hurt your shoulder, how? e.g. By falling onto your shoulder?
-which movements do hurt because I do not exactly understand. e.g. putting hand on opposite shoulder, reach high.
-can you lie on your shoulder?
-constant pain? where, does it radiate as before to elbow?
-Any neck problems since or prior to accident? (consider even an occassional stiffness of the neck/shoulders as a neck problem. Headaches?)
The problem with the shoulder pain is that a lot of different areas can contribute it. Impingement as mentioned, Acromio Clavicular joint (problem reaching accross the body, behind and up), bursitis(painful arc, like moving arm sideways it becomes painful and then it disapears again aftera certain angle of arm to body), tendinitis(painful arc), nerve impinchement from neck to shoulder. It appears to me that although you have had physio, the cause has not been dealt with. Sometimes a slight change in shoulder/scapula movement can cause the problem but to my experience in that case a nerve is involved.
A bony spur is not that likely timewise, partly ruptured tendon more likely. But describe as good as possible what sort of pain when and where.
Cheers