MRI Scan for Shoulder Pain and Injuries

Shoulder pain is the third most common musculoskeletal complaint seen by GPs in the UK, after back pain and knee pain. Around 1 in 3 adults will experience shoulder pain at some point, and it is the joint most commonly referred for MRI. An MRI scan of your shoulder shows the rotator cuff tendons, labrum, cartilage, bursa, and bone in exceptional detail — far more than X-ray or ultrasound — helping your clinician pinpoint exactly what is causing your pain.

Whether your shoulder seized up gradually, gave way during sport, or aches constantly at night, an MRI gives your doctor or surgeon the structural detail they need to recommend the right treatment.

Common Causes of Shoulder Pain

• Rotator cuff disease — the most common cause. Includes tendinopathy (degeneration), partial-thickness tears, and full-thickness tears. Affects 20-30% of the general population, rising to over 50% in people over 60. Many tears are painless.
• Subacromial impingement — the rotator cuff tendons get pinched between the humeral head and the acromion (bony roof of the shoulder) during overhead movements. Often coexists with rotator cuff tendinopathy.
• Frozen shoulder (adhesive capsulitis) — affects 2-5% of the general population, more common in diabetics (up to 20%). Causes progressive stiffness and pain over months. MRI shows thickening of the joint capsule and surrounding inflammation.
• Labral tears — tears of the cartilage ring around the shoulder socket (glenoid). SLAP tears (superior labrum from front to back) are common in overhead athletes and after falls on an outstretched hand. Bankart lesions occur with shoulder dislocations.
• Acromioclavicular (AC) joint problems — arthritis or injury to the joint between the collarbone and shoulder blade. Common in weightlifters and contact sport players.
• Calcific tendinitis — calcium deposits within the rotator cuff tendons. Can cause sudden, severe pain. Better seen on X-ray or ultrasound than MRI.
• Shoulder instability — recurrent dislocations or subluxations, often with associated labral and capsular damage.
• Osteoarthritis — wear of the glenohumeral joint. Less common than knee or hip arthritis but can be disabling.
• Referred pain — neck problems (cervical radiculopathy) can cause shoulder pain without any shoulder pathology.

When Should You Get a Shoulder MRI?

• Shoulder pain persisting beyond 6-8 weeks despite physiotherapy
• Suspected rotator cuff tear — weakness lifting the arm, pain at night, pain reaching behind the back
• Shoulder instability — history of dislocation or feeling of the shoulder slipping
• Unexplained loss of range of movement
• Pre-surgical assessment — your surgeon needs to see the exact anatomy before operating
• Sports injury with suspected labral tear or significant structural damage
• Shoulder pain with normal X-rays — MRI shows the soft tissue problems that X-rays miss entirely

What a Shoulder MRI Shows

The radiologist systematically reviews every structure in the shoulder:

• Rotator cuff tendons — supraspinatus (most commonly torn), infraspinatus, subscapularis, and teres minor. Each is assessed for tendinopathy (thickening, abnormal signal), partial tears (articular-sided, bursal-sided, or intrasubstance), and full-thickness tears (measured in anteroposterior and medial-lateral dimensions). Tendon retraction is also measured — a retracted tendon is harder to repair surgically.
• Labrum — the fibrocartilage ring around the glenoid socket. Assessed for SLAP tears, Bankart lesions, and paralabral cysts. MR arthrography (MRI with contrast injected directly into the joint) is sometimes used for better labral visualisation.
• Biceps tendon — the long head runs through the bicipital groove. Assessed for tendinopathy, tears, subluxation, or dislocation out of the groove.
• Joint capsule — thickening and inflammation suggest adhesive capsulitis (frozen shoulder). Assessed on T2-weighted and contrast-enhanced images.
• Subacromial-subdeltoid bursa — fluid or thickening indicates bursitis, often associated with impingement.
• Acromion shape — classified as type I (flat), type II (curved), or type III (hooked). Type III acromions are associated with higher rates of rotator cuff impingement.
• Bone — humeral head, glenoid, clavicle, and acromion assessed for fractures, bone marrow oedema, cysts, and arthritis.
• Glenohumeral joint — cartilage thickness, joint effusion, and loose bodies.

MRI Sequences

• Proton-density fat-saturated (PD FS) — the main workhorse sequence for shoulder MRI. Excellent for tendons, labrum, and cartilage.
• T2-weighted — fluid-sensitive. Shows tears (fluid fills the gap), effusions, and oedema.
• T1-weighted — good anatomical detail and bone marrow assessment.
• Coronal oblique, sagittal oblique, and axial planes — the shoulder is imaged along the plane of the supraspinatus tendon, not standard body planes.

What a Shoulder MRI Cannot Show

• Dynamic impingement — MRI is done lying still. The impingement that occurs during arm elevation cannot be seen. Clinical examination and dynamic ultrasound are better for this.
• Small labral tears — standard MRI misses some labral tears. MR arthrography (with contrast injected into the joint) has higher sensitivity but is more invasive.
• Pain source — many MRI findings (small rotator cuff tears, labral fraying, AC joint arthritis) are found in people without any symptoms. Your symptoms must be correlated with the scan findings.
• Cervical cause of shoulder pain — if your pain is referred from the neck, a shoulder MRI will look normal. A cervical spine MRI would be needed.

What to Expect During Your Shoulder MRI

A shoulder MRI takes 25-40 minutes. You lie on your back with your arm at your side (or slightly rotated, depending on the protocol). A dedicated shoulder coil is placed over the joint.

Your shoulder will be inside the scanner bore, and depending on the machine, your head may be just inside or outside the opening. The scan produces the usual loud knocking and buzzing — headphones or earplugs are provided.

If your shoulder is painful, try to find a comfortable resting position before the scan starts. You can take your usual painkillers beforehand. Let the radiographer know if you need extra padding or support.

Preparation

No special preparation for a standard shoulder MRI. Eat, drink, and take medications normally. Remove all jewellery, watches, and piercings. If MR arthrography is needed, there will be a separate appointment first to inject contrast into the joint under X-ray guidance.

Alternative Diagnostic Approaches

• Ultrasound — excellent for assessing rotator cuff tendons and bursae. Dynamic assessment (scanning while you move the shoulder) is a unique advantage. However, ultrasound is operator-dependent and cannot see the labrum, deep structures, or bone marrow well.
• X-ray — first-line for fractures, calcification, arthritis, and acromion shape. Does not show soft tissues.
• CT scan — better than MRI for bony detail. Used for complex fracture planning and some arthritis assessments. CT arthrography (with contrast injected into the joint) is an alternative to MR arthrography for labral assessment.
• Diagnostic injection — a local anaesthetic injection into the subacromial space can confirm impingement if it temporarily relieves pain.

Treatment Pathways After Your MRI

• Rotator cuff tendinopathy/partial tear — physiotherapy (strengthening, stretching), activity modification, NSAIDs, subacromial corticosteroid injection. Most improve within 3-6 months. Surgery is rarely needed for partial tears.
• Full-thickness rotator cuff tear — depends on tear size, patient age, and activity demands. Small tears in older patients often manage well with physiotherapy. Larger tears in active patients may benefit from arthroscopic repair. Success rates for rotator cuff repair are around 80-90% for pain relief, though re-tear rates range from 10-40% depending on tear size.
• Frozen shoulder — typically self-limiting (resolves in 12-30 months), but this is a long and painful process. Treatments include physiotherapy, steroid injections (into the joint, not the subacromial space), hydrodilatation (injecting fluid to stretch the capsule), and manipulation under anaesthetic. Arthroscopic capsular release for resistant cases.
• Labral tear — physiotherapy first for many tears. Arthroscopic repair for symptomatic SLAP tears in young athletes or Bankart lesions causing recurrent instability.
• AC joint arthritis — activity modification, steroid injection, physiotherapy. Arthroscopic excision arthroplasty if conservative measures fail.

UK Statistics

• Shoulder pain affects approximately 18-26% of adults at any given time
• Rotator cuff tears are found in 20-30% of the general population, rising to over 50% in people over 60
• Around 300,000 people in the UK see their GP for shoulder pain each year
• Shoulder surgery (arthroscopic subacromial decompression, rotator cuff repair) accounts for over 50,000 procedures annually in the UK
• Frozen shoulder affects 2-5% of the general population and up to 20% of diabetics

Frequently Asked Questions

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