Understand Your Shoulder Cuff, Labrum & Joint Scans

Working through a shoulder MRI report one structure at a time

Most shoulder MRI reports move tendon by tendon through the cuff: supraspinatus, infraspinatus, subscapularis, then teres minor. For each one the radiologist notes whether the fibers are continuous, thinned, partially torn, or torn all the way through, and if there is a tear, how many millimeters the stump has pulled back from its normal attachment on the humerus. That pullback distance, called retraction, often decides whether a surgeon can pull the tendon back to bone arthroscopically or needs a more involved reconstruction.

Right alongside any tear measurement sits a Goutallier score, a zero-to-four scale rating how much of the muscle behind that tendon has turned into fat. Zero means healthy muscle bulk; four means fat outweighs muscle fiber. A high score usually means the tear has been present for months or years, and it is one of the strongest predictors of whether a repaired tendon will actually stay attached once you start loading it again.

After the cuff, the report addresses the labrum — the cartilage lip that deepens an otherwise shallow socket — and the biceps anchor, where the long head of the biceps tendon fastens onto the labrum's top edge. A tear centered on that anchor is labeled a SLAP lesion; a tear at the front-lower rim, frequently tied to a prior dislocation, is labeled a Bankart lesion. From there the radiologist checks the subacromial space and the bursa that lines it, since a squeezed space or a swollen bursa points to impingement between the cuff and the bone above it.

Two remaining structures close out most reports. The acromioclavicular joint, the small joint where collarbone meets shoulder blade, gets scored for arthritis, widening, or a bone spur hanging down into the cuff's path. The glenohumeral cartilage — the lining across the ball-and-socket surfaces — is graded for thinning or bare bone, which tells you whether joint wear is adding to your symptoms on top of whatever tendon or labral finding brought you in.

Cuff-tear and labral-tear phrases decoded

A handful of terms show up again and again in cuff reports. "Partial-thickness tear" means some tendon fibers are torn but a layer of intact tissue still bridges the gap; "full-thickness tear" means no fibers remain connecting tendon to bone anywhere across that spot. "Tendinosis" describes worn, degenerated fibers with no actual tear present — wear rather than rupture. A tear called "crescent-shaped" sits differently for repair purposes than one called "U-shaped," since the shape dictates how the surgeon brings the edges back together.

Labral phrasing runs on its own scale. SLAP lesions are graded from type I, simple fraying, up through type IV, where the split runs into the biceps tendon itself. A labral tear labeled "Bankart" is soft tissue only; one labeled "bony Bankart" means a chip of the glenoid bone came away with it, which changes whether a stabilisation procedure has to rebuild bone as well as reattach cartilage.

How long cuff and labral tissue takes to heal

Cuff tendon does not mend the way bone does. A partial tear can quiet down and stop hurting after eight to twelve weeks of guided loading, but the torn fibers rarely knit back to their original strength without help. A full-thickness tear essentially never closes on its own — the gap tends to grow wider over months as the retracted stump scars into its new, shortened position, which is why the timing of a repair decision matters so much for this joint.

The labrum shares that same limited blood supply, concentrated at its outer rim. A minor fray can settle down with rest and modified activity, but a displaced Bankart or SLAP tear almost never reattaches on its own once it has pulled away from the glenoid. Suture anchors placed during surgery re-create that attachment, and the labrum typically needs six to twelve weeks to bond solidly to bone before it can tolerate real load again.

Rehab goals after cuff repair, stabilisation, and frozen shoulder

A cuff repair protocol spends its first six weeks protecting the freshly reattached tendon: a sling, and motion that a therapist moves for you rather than motion you generate yourself. Weeks six through twelve add active-assisted movement, and true strengthening waits until three to four months out, once exam or imaging findings confirm the tendon has actually bonded rather than just had time pass.

A labral stabilisation follows a different early script: motion in the direction that caused the original instability — often external rotation after a front-of-joint repair — is restricted while the anchors integrate. Once that window closes, cuff and scapular strengthening take over, building the dynamic control that keeps the ball centered during overhead reaching or throwing.

Frozen shoulder rehab is not tissue repair at all. The capsule surrounding the joint has thickened and tightened, so the whole program is graded stretching aimed at recovering external rotation and reach overhead, worked through in stages that clinicians label freezing, frozen, and thawing, often spread across many months rather than the weeks a repair protocol uses.

Matching the scan to the shoulder question: X-ray, MRI, arthrogram, CT

An X-ray answers the bone questions in seconds: a fracture line, which way a joint has dislocated, narrowed joint space, or calcium deposits sitting inside a cuff tendon all show up clearly, but soft tissue passes through the beam invisibly. A standard MRI picks up where the X-ray stops, mapping cuff tears, muscle fatty change, and bursal fluid without needing any injection at all.

An MR arthrogram injects contrast straight into the joint before scanning, which stretches the capsule open and throws the labrum into much sharper relief than a plain MRI manages — the go-to study whenever a SLAP lesion or a subtle Bankart tear is suspected but not obvious. CT steps in when the question is about bone shape rather than soft tissue: measuring how much glenoid bone has been lost after repeated dislocations, mapping out hardware placement, or confirming a healed fracture's alignment are all jobs CT does better than MRI.