Shoulder Pain: Causes, Symptoms, Diagnosis, and Treatment

Shoulder pain is a common complaint with various potential causes. One of the most frequent causes is shoulder impingement syndrome, which accounts for 50% of all doctor visits related to shoulder pain. In cases of rotator cuff tendinitis, raising the arm is painful due to compression of the subacromial bursa, which lies between the supraspinatus tendon and the acromion. Subacromial bursitis often occurs alongside impingement syndrome, causing pain due to overuse and inflammation of the bursa. Rotator cuff tears are another common source of shoulder pain. The supraspinatus tendon is most frequently affected, and tears can be partial or complete. Complete tears usually require surgical intervention. Patients with rotator cuff tears typically experience inability to actively raise the arm while passive range of motion remains intact. Night pain is a hallmark symptom and often suggests that conservative treatments may not be effective, indicating the need for surgery. MRI is useful in assessing tendon integrity and muscle atrophy, but it has a high false-positive rate. In individuals over 60 years old, 55% of asymptomatic patients may show rotator cuff tears on MRI, emphasizing the importance of correlating imaging with clinical findings. Biceps tendinitis is an inflammatory condition affecting the long head of the biceps tendon, where it inserts at the front of the shoulder. It often develops secondary to rotator cuff tendinitis and presents as anterior shoulder pain. The glenoid labrum is a fibrocartilaginous rim that stabilizes the shoulder joint. Labral tears are frequently associated with significant shoulder pathology. The two most common types of labral injuries are SLAP (Superior Labrum Anterior to Posterior) tears and Bankart lesions. SLAP tears occur at the superior labrum where the biceps tendon attaches. They are rare and difficult to diagnose. Symptoms include deep shoulder pain, a catching or clicking sensation, pain with overhead movements, and discomfort when throwing a ball. The O'Brien test is commonly used for diagnosis, and MRI arthrogram provides better visualization of the tear. Bankart lesions result from shoulder dislocations, which cause anterior labral tears in anterior dislocations and posterior labral tears in posterior dislocations. The acromioclavicular (AC) joint is located at the top of the shoulder, where the acromion of the scapula and the clavicle meet. AC joint disorders can result from arthritis, osteolysis, or trauma. Distal clavicular osteolysis is often seen in weightlifters due to repetitive stress on the joint. Another frequent cause of shoulder pain is glenohumeral arthritis. Patients experience global shoulder pain, restricted range of motion, and stiffness. X-rays typically reveal joint degeneration. Diagnosis and Treatment The treatment of shoulder pain depends entirely on the underlying cause. Proper diagnosis may require a clinical exam, X-rays, and MRI. It is also essential to differentiate true shoulder pain from referred pain originating from the cervical spine. Quiz Questions: 1. What is the most common cause of shoulder pain seen in clinical practice? ✅ Shoulder impingement syndrome Biceps tendinitis Glenohumeral arthritis AC joint osteolysis Explanation: Shoulder impingement accounts for nearly 50% of all shoulder pain cases. 2. What structure is compressed in rotator cuff tendinitis during arm elevation? ✅ Subacromial bursa Glenoid labrum Biceps tendon Coracoid process Explanation: The subacromial bursa lies between the supraspinatus tendon and the acromion, becoming compressed during overhead movements. 3. Which rotator cuff tendon is most commonly affected by tears? ✅ Supraspinatus tendon Infraspinatus tendon Subscapularis tendon Teres minor tendon Explanation: The supraspinatus tendon is the most frequently torn rotator cuff tendon due to its location beneath the acromion. 4. What symptom strongly suggests a complete rotator cuff tear? ✅ Inability to actively raise the arm Pain at night Shoulder stiffness Tenderness over the AC joint Explanation: Patients with complete rotator cuff tears lose active range of motion but retain passive motion. 5. What diagnostic imaging is most useful for assessing rotator cuff tears? ✅ MRI X-ray Ultrasound CT scan Explanation: MRI provides detailed imaging of soft tissue structures, including the rotator cuff. 6. Which test is most commonly used to diagnose a SLAP tear? ✅ O'Brien test Neer test Hawkins-Kennedy test Speed's test Explanation: The O'Brien test is commonly used to diagnose SLAP tears, which affect the superior labrum. 7. Which condition is commonly associated with weightlifting? ✅ Distal clavicle osteolysis Bankart lesion Frozen shoulder Biceps rupture Explanation: Repetitive stress on the AC joint can lead to osteolysis, especially in weightlifters. 8. Which imaging modality is preferred for detecting SLAP tears? ✅ MRI arthrogram X-ray Ultrasound Bone scan