MRI do detects rotator cuff
tears better that ultrasound
. Besides it can also detect other pathologies including subacromial bursitis
, rotator cuff impingement, tendinosis
And according to the pathology the treatment can be tailored.
Other things that are required to be known are ur age, whether you are diabetic or not. Then with examination and correlating the MRI findings, the right line of treatment can be decided whether conservative or surgical.