A Musculoskeletal (MSK) Ultrasound of the shoulder is a real-time imaging test that uses high-frequency sound waves to create detailed pictures of the soft tissues around your shoulder joint. It is often called a shoulder ultrasound tendon exam because it is especially good at showing tendons, muscles, ligaments, the joint lining, and fluid-filled sacs (bursae). Unlike X-rays, ultrasound does not use radiation and is well suited for looking at soft-tissue injuries and inflammation.

During a rotator cuff scan (a common type of shoulder MSK ultrasound), the clinician evaluates key structures such as the rotator cuff tendons (supraspinatus, infraspinatus, subscapularis, and teres minor), the long head of the biceps tendon, the subacromial-subdeltoid bursa, and surrounding muscles and ligaments. Because the images are captured in motion, this MSK ultrasound can also be performed dynamically—meaning the examiner may ask you to move your arm to see how tendons glide, whether something is pinching (impingement), or whether a tendon slips out of place.

Results generally describe whether the tendons and other soft tissues look normal or show signs of injury or irritation. For example, the report may mention tendinosis (degeneration or “wear and tear”), tendinitis (inflammation), fluid suggesting bursitis, calcifications, or a partial- or full-thickness tear of the rotator cuff. It can also identify swelling around the biceps tendon or a biceps tendon tear or subluxation. Normal findings mean the examined soft tissues look intact with no significant tears, abnormal fluid, or swelling noted.

A shoulder MSK ultrasound is typically ordered when a person has shoulder pain, weakness, or limited range of motion and the clinician wants a fast, detailed look at tendons and other soft tissues. It is commonly used to evaluate suspected rotator cuff problems and can be a helpful first-line or follow-up test after a physical exam.

Your provider may recommend a shoulder ultrasound if you have symptoms such as:

• Pain on lifting the arm, reaching overhead, or reaching behind the back
• Shoulder weakness, especially with lifting or rotating the arm
• Pain that is worse at night or when lying on the affected side
• A “catching,” “clicking,” or “pinching” sensation with movement (possible impingement)
• Swelling, warmth, or tenderness around the shoulder
• Reduced range of motion or stiffness after injury or overuse

It is also often used when there is:

• A recent injury (fall, sudden pull, sports injury) with concern for tendon tear
• Repetitive overhead activity (work, sports) raising suspicion for rotator cuff tendinopathy or bursitis
• Persistent symptoms despite rest, anti-inflammatory treatment, or physical therapy
• Need for a dynamic assessment (watching structures during movement) that MRI cannot provide in real time
• Guidance for procedures such as corticosteroid injections, aspiration of fluid, or targeted anesthetic injections

Ultrasound is particularly useful for people who cannot have an MRI (for example, due to certain implanted devices) and for comparing both shoulders during the same visit.

• Rotator cuff tendinopathy (tendinosis) and tendinitis
• Rotator cuff tears (partial-thickness or full-thickness)
• Subacromial-subdeltoid bursitis
• Shoulder impingement syndrome
• Biceps tendinitis, tenosynovitis, or biceps tendon tear/subluxation
• Calcific tendinitis (calcium deposits in the rotator cuff)
• Shoulder joint effusion (excess fluid) and synovitis
• Acromioclavicular (AC) joint inflammation or degenerative changes (when included in the scan)
• Soft-tissue strains or partial muscle tears around the shoulder

• Identifying the cause of shoulder pain to support faster, more targeted treatment
• Confirming or ruling out a rotator cuff tear to guide decisions about physical therapy vs. surgery
• Monitoring recovery of tendon injuries over time, including response to rehabilitation
• Evaluating overuse injuries in work or sports to prevent worsening damage
• Guiding precision injections or fluid drainage to improve pain and function
• Supporting a safe return-to-activity plan by documenting healing and reducing reinjury risk