Mri shoulder says small degree of subacromial subdeltoid bursitis and a type 3 antero- lateral acromial spur. what does this mean an what is treatment? tried phsyio no help dull ache in shoulder that clicks / fell of motorbike a year ago

Impingement: The space between the palpable shoulder bone (acromion) and the all-important rotator cuff, that helps raise one's arm above shoulder level, contains a small bursa or shock absorber between the undersurface of the bone and the overlying surface of the rotator cuff. Once it gets inflamed and angry, it can become very painful and fills with yet more fluid. Injections are usually tried initally.