The rotator cuff is a group of four muscles and their tendons that surround the shoulder joint, stabilizing the humeral head within the socket and enabling a full range of arm motion. A rotator cuff tear occurs when one or more of these tendons partially or completely detach from the bone.
Rotator cuff tears are the most common cause of shoulder pain and disability in adults over 40. They frequently occur alongside other shoulder pathology — including subacromial impingement, shoulder bursitis, and biceps tendon tears — and MRI is the definitive tool for evaluating all of these structures simultaneously in a single examination.
Causes
Acute injury
Rotator cuff tears can result from a sudden traumatic event such as falling on an outstretched arm, lifting a heavy object with a jerking motion, or sustaining a direct blow to the shoulder. These acute tears are common in athletes and active individuals and are frequently associated with shoulder dislocation.
Degenerative wear
Most rotator cuff tears develop gradually over time due to repetitive overhead activity, age-related tendon degeneration, and reduced blood supply to the tendon tissue. People over 40 are at significantly higher risk for degenerative tears. Occupations or sports requiring repeated overhead motion — such as painting, swimming, or throwing — accelerate this process. Chronic subacromial impingement is a common precursor, with the acromion repeatedly abrading the supraspinatus tendon over time.
Symptoms
Common symptoms include a dull ache deep in the shoulder, weakness when lifting or rotating the arm, pain with overhead activities, and difficulty reaching behind the back. Pain may worsen at night and interfere with sleep. In the case of a sudden acute tear, patients may experience immediate severe pain and a tearing sensation. Significant weakness with arm elevation — particularly the inability to hold the arm up against gravity — suggests a large or complete tear.
Diagnosis
A physician will perform a physical examination assessing shoulder strength, range of motion, and pain provocation with specific maneuvers — including the empty can test, drop arm test, and Hawkins-Kennedy test. X-rays evaluate bony structures and may show superior migration of the humeral head in massive tears. A dedicated shoulder MRI is the gold standard for visualizing the rotator cuff tendons, identifying the location and size of a tear, assessing the degree of muscle atrophy and fatty infiltration, and evaluating associated pathology such as bursitis and biceps tendon involvement — all critical factors in determining appropriate treatment.
Tear classification
Rotator cuff tears are classified by thickness and size:
- Partial thickness tear: Tendon is damaged but not completely severed. May involve the bursal surface, articular surface, or be intratendinous.
- Full thickness tear (small to medium): Tendon is completely torn but the gap is less than 3 cm.
- Full thickness tear (large to massive): Tear involves 3 cm or more of tendon or affects multiple tendons, often with retraction and muscle atrophy — factors that influence surgical repairability.
Treatments
Treatment is guided by tear size and severity, patient age, activity level, and overall shoulder health.
After the initial injury, rest, ice, activity modification, and anti-inflammatory medications are recommended.
Partial and small full thickness tears: Physical therapy to strengthen the surrounding musculature, activity modification, and corticosteroid injections for pain relief often provide good results without surgery. Most patients with partial tears improve significantly with a structured conservative program.
Large or massive tears in young and active patients
Surgery is often advised for young or active patients who want to recover full function. Arthroscopic rotator cuff repair reattaches the torn tendon to the bone using suture anchors. After surgery, a thorough physical therapy program is critical to healing and recovering function. Recovery typically takes 4–6 months.
Large or massive tears in older or lower-demand patients
Older patients who do not require full rotator cuff strength for sports or high-level activities may be managed with physical therapy, activity modification, and periodic injections. For irreparable massive tears with significant arthritis, reverse total shoulder arthroplasty may be considered.
Get an MRI to Confirm Your Diagnosis
Before surgical planning or starting treatment, a clear MRI diagnosis ensures the right path forward. First Look MRI offers self-pay Shoulder MRI scans — no doctor's order or insurance required — at our locations in Georgia, Texas, and Colorado.