- Shoulder osteoarthritis is cartilage degeneration in the glenohumeral joint.
- Physiotherapy and exercises are the initial treatment approach.
- Secondary osteoarthritis, often from rotator cuff tears, is more common.
- Symptoms include deep pain, stiffness, and reduced arm mobility.
Table of Contents
Shoulder osteoarthritis
Shoulder osteoarthritis (or omarthrosis) is a degenerative condition affecting the glenohumeral joint, characterized by the progressive deterioration of the cartilage that covers the head of the humerus and the glenoid cavity of the scapula. It is less common than hip and knee osteoarthritis (because the shoulder is not a weight-bearing joint), but when present, it causes significant pain and functional limitation that compromise the simplest daily activities: combing hair, dressing, reaching for objects overhead.
Shoulder osteoarthritis can be primary (degenerative, age-related) or secondary (a consequence of trauma, rotator cuff tears, chronic instability, rheumatoid arthritis). Conservative treatment with physiotherapy and exercises is the first approach, while shoulder replacement is reserved for advanced cases that do not respond to conservative therapy.
Table of Contents
- Anatomy of the Glenohumeral Joint
- Causes and Types of Shoulder Osteoarthritis
- Symptoms
- Diagnosis
- Conservative Treatment
- Exercises for Shoulder Osteoarthritis
- Surgical Treatment
- Timeline and Prognosis
- Prevention
- Frequently Asked Questions (FAQ)
- Frequently Asked Questions
- Sources and Scientific References
Anatomy of the Glenohumeral Joint
The shoulder joint is formed by the humeral head (spherical) articulating with the glenoid (a small, shallow cavity of the scapula). It is the most mobile joint in the body, but this mobility comes at the cost of inherently limited stability.
Articular cartilage covers both surfaces and allows for friction-free movement. In osteoarthritis, this cartilage progressively thins until the underlying bone is exposed, causing pain, inflammation, and the formation of osteophytes (bone spurs).
In addition to the glenohumeral joint, osteoarthritis can also affect the acromioclavicular (AC) joint, located between the clavicle and the acromion. AC osteoarthritis is very common, often asymptomatic, and can coexist with omarthrosis.
Causes and Types of Shoulder Osteoarthritis
Primary Osteoarthritis (Degenerative)
Less common than in the hip and knee, it develops after 60-70 years of age due to the progressive wear of the cartilage. It mainly affects the dominant shoulder.
Secondary Osteoarthritis
More frequent than primary osteoarthritis, it is caused by:
- Chronic rotator cuff tear (cuff tear arthropathy): chronic rupture of the rotator cuff tendons alters joint mechanics, causing superior migration of the humeral head and abnormal cartilage wear. It is the most common cause of severe shoulder osteoarthritis.
- Post-traumatic: after humeral head fractures, recurrent dislocations, or previous surgery.
- Rheumatoid arthritis: rheumatoid arthritis can affect the shoulder with chronic inflammation and joint destruction.
- Osteonecrosis of the humeral head: the death of bone tissue (due to trauma, corticosteroids, alcohol) causes the collapse of the humeral head.
- Chronic instability: recurrent dislocations accelerate joint degeneration.
- Previous adhesive capsulitis: prolonged stiffness can alter joint mechanics.
Symptoms
Pain
- Deep shoulder pain: dull and constant, localized in the anterior and lateral region of the shoulder.
- Worsening with activity: pain increases with arm use, especially during lifting and rotational movements.
- Night pain: difficulty sleeping on the affected side — one of the most debilitating symptoms.
- Pain at rest: in advanced stages, pain is also present at rest.
- Morning stiffness: improves with movement, but stiffness tends to worsen over time.
Functional Limitation
- Reduced mobility: progressive loss of shoulder flexion, abduction, and rotation.
- Difficulty with daily activities: dressing, combing hair, fastening a bra, reaching high shelves, driving.
- Crepitus: sensation of crunching or creaking during shoulder movement.
Weakness
Muscle weakness is common, both due to pain inhibiting contraction and, in cuff tear arthropathy, due to rotator cuff tendon tears.
Diagnosis
Clinical Examination
- Mobility: evaluation of active and passive range of motion (both reduced in osteoarthritis, unlike impingement where passive range is often preserved).
- Crepitus: palpable and audible during movement.
- Muscle strength: evaluation of the rotator cuff.
- Specific tests: Neer’s test, Hawkins’ test, AC joint tests.
Imaging Diagnostics
- X-ray: the first-line examination. Shows joint space narrowing, osteophytes, subchondral sclerosis, and, in cuff tear arthropathy, superior migration of the humeral head.
- MRI: evaluates the condition of the rotator cuff tendons, cartilage, and glenoid labrum.
- CT scan: useful for surgical planning (prosthesis).
Conservative Treatment
The glenohumeral joint is a ball-and-socket articulation between the spherical humeral head and shallow glenoid cavity of the scapula, enabling exceptional mobility at the cost of inherent instability. Conservative treatment is indicated as the first approach in all grades of osteoarthritis and may be sufficient in the majority of mild-to-moderate cases.
Lifestyle
- Adequate physical activity: maintaining shoulder movement is essential. Sedentary lifestyle worsens stiffness.
- Activity modifications: avoid repetitive overhead movements, use aids to reach high objects.
- Local heat: warm compresses to reduce stiffness.
Medications
- NSAIDs (ibuprofen, naproxen) for flare-ups.
- Paracetamol for mild chronic pain.
- Intra-articular corticosteroid injections: effective in reducing inflammation and pain for 4-8 weeks (max 3-4 per year).
- Hyaluronic acid injections: can improve joint lubrication.
Physiotherapy
Physiotherapy is the cornerstone of conservative treatment:
- Maintaining mobility: preventing progressive loss of movement.
- Muscle strengthening: strengthening the rotator cuff and scapular stabilizers to compensate for cartilage loss.
- Manual therapy: joint mobilizations to improve mobility.
- Functional re-education: teaching alternative strategies for daily activities.
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Exercises for Shoulder Osteoarthritis
A regular exercise program is essential to maintain mobility and function of the osteoarthritic shoulder. Your doctor or physical therapist will adapt the program to your specific situation.
Mobilization
Codman’s Pendulum Exercise
[IMAGE: Person leaning forward with one hand resting on a table. The painful arm hangs relaxed and swings in small circles, back and forth and sideways, using the weight of the arm as gentle traction. Side view showing the torso’s inclination and the arm’s swing.]
Arm slide on table
[IMAGE: Person sitting in front of a table with the arm of the painful side resting on the table on a towel. The arm slowly slides forward on the table (assisted flexion), then sideways (assisted abduction). The torso leans slightly forward to assist the movement. Top view showing the two movements (forward and sideways).]
Assisted flexion with stick
[IMAGE: Person lying supine holding a stick (or broom handle) with both hands shoulder-width apart. The healthy arm guides the stick upwards over the head, also lifting the painful arm in an assisted manner. The arms remain extended. Side view showing the upward movement of the stick.]
Stretching
External rotation stretch with stick
[IMAGE: Person standing holding a stick behind their back with both hands. The healthy hand (bottom) pushes the stick upwards, bringing the painful arm (top) into external rotation. Rear view showing the grip on the stick and the direction of the push.]
Cross-body stretch (posterior capsule stretch)
[IMAGE: Person standing, bringing the painful arm across the chest in horizontal adduction. The healthy hand grasps the elbow and gently pulls the arm towards the body. Front view showing the direction of the posterior shoulder capsule stretch.]
Strengthening
External rotation with resistance band
[IMAGE: Person standing with the elbow of the painful arm tucked against the side, flexed at 90 degrees. A rolled towel is between the elbow and the side. A therapeutic resistance band attached to a fixed point provides resistance. The forearm rotates outwards against the resistance of the band. Front view with detail of the band and the movement.]
Light lateral raise (below 90°)
[IMAGE: Person standing with a small weight (0.5-1 kg) in hand. The arm lifts laterally with the thumb pointing upwards to about 60-70 degrees (below shoulder height). The movement is slow and controlled. Front view with indication of the maximum angle.]
Scapular retraction in prone position
[IMAGE: Person lying prone on a mat with arms along the sides, palms down. The shoulder blades move closer to the spine, slightly lifting the arms and chest off the floor. Thumbs rotate towards the ceiling. Rear view showing the retraction of the shoulder blades.]
Surgical Treatment
When to Operate?
Surgery is indicated when:
- Pain is severe and does not respond to 3-6 months of conservative treatment.
- Functional limitation is such that it compromises daily activities and quality of life.
- Night pain is intractable.
Surgical Options
- Arthroscopy: joint debridement, removal of osteophytes and loose bodies — indicated in early stages.
- Anatomic shoulder replacement: replacement of joint surfaces with an artificial implant — indicated in osteoarthritis with an intact rotator cuff.
- Reverse shoulder replacement: a prosthesis with inverted geometry that uses the deltoid instead of the rotator cuff — indicated in cuff tear arthropathy (torn cuff).
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Post-replacement rehabilitation generally lasts 3-6 months and requires a structured physiotherapy program.
Timeline and Prognosis
Shoulder osteoarthritis is a chronic and progressive condition, but the rate of progression varies. With a regular exercise and physiotherapy program, many patients maintain good function for years.
| Phase | Expectations |
|---|---|
| Initial | Manageable with exercises and medication as needed |
| Moderate | Regular physiotherapy + injections |
| Advanced | If conservative treatment fails: surgical evaluation |
| Post-replacement | 3-6 months of rehabilitation, good functional results |
Prevention
- Maintain mobility: daily shoulder mobilization exercises.
- Rotator cuff strengthening: exercises 3 times a week to protect the joint.
- Early treatment of cuff tears: an untreated torn cuff leads to arthropathy.
- Regular physical activity: movement keeps cartilage nourished.
- Avoid overuse: alternate overhead activities with adequate breaks.
For more information, consult the Complete Guide to Shoulder Pain.
Frequently Asked Questions (FAQ)
Osteoarthritis is a chronic degenerative condition: lost cartilage does not regenerate. However, symptoms can be effectively managed with exercises, physiotherapy, and, if necessary, medications and injections. In advanced cases that do not respond to conservative treatment, shoulder replacement offers very satisfactory results.
Yes, physical activity is recommended and beneficial. Swimming (backstroke and freestyle with correct technique), walking, Pilates, and adapted yoga are particularly indicated. Sports with shoulder impact (heavy overhead weightlifting, competitive tennis) should be avoided. Your doctor or physical therapist will advise on the most suitable sports.
Shoulder replacement is considered when pain and functional limitation significantly compromise the quality of life despite at least 3-6 months of adequate conservative treatment. The decision should be made together with your doctor or physical therapist, evaluating age, functional expectations, and the condition of the rotator cuff.
Pain from shoulder osteoarthritis is typically localized in the shoulder and can radiate to the lateral arm down to the elbow. If the pain radiates to the hand or fingers with tingling, a cervical cause (cervicobrachialgia) is more likely and should be ruled out with an appropriate evaluation.
Supraspinatus tendinitis is the inflammation of a specific rotator cuff tendon, often caused by impingement. Osteoarthritis is the degeneration of articular cartilage. Tendinitis is more frequent between 40-60 years of age, osteoarthritis after 60-70. The two conditions can coexist. Physiotherapy treatment is effective for both.
Corticosteroid injections can provide significant pain relief for 4-8 weeks and are useful during flare-ups. They should not be repeated too frequently (max 3-4 per year) because excessive use can accelerate degeneration. Hyaluronic acid injections represent an alternative to improve joint lubrication. In any case, injections are a complement, not a substitute, for physiotherapy and exercises.
Frequently Asked Questions
What are the main types of shoulder osteoarthritis?
Shoulder osteoarthritis is broadly categorized into primary and secondary forms. Primary osteoarthritis is typically age-related and degenerative, occurring without a clear preceding injury. Secondary osteoarthritis develops as a consequence of other factors such as trauma, rotator cuff tears, chronic joint instability, or inflammatory conditions like rheumatoid arthritis.
How is shoulder osteoarthritis typically diagnosed?
Diagnosis of shoulder osteoarthritis usually involves a comprehensive clinical examination by a healthcare professional. This assessment evaluates pain, range of motion, and functional limitations. Imaging diagnostics, such as X-rays, are often utilized to confirm cartilage degeneration and assess the extent of joint damage.
What is the initial approach to managing shoulder osteoarthritis?
The initial management strategy for shoulder osteoarthritis primarily focuses on conservative treatments. This often involves working with a physical therapist on specific exercises to improve mobility, strength, and reduce pain. Lifestyle modifications and certain medications may also be part of this initial approach to manage symptoms.
Why is shoulder osteoarthritis less common than hip or knee osteoarthritis?
Shoulder osteoarthritis is less prevalent compared to osteoarthritis in weight-bearing joints like the hip and knee. This difference is primarily attributed to the shoulder’s anatomical function, as it is not subjected to the constant compressive forces and weight-bearing stresses experienced by the lower limb joints during daily activities.
For a broader overview of related conditions, see our our comprehensive shoulder pain guide.
Sources and Scientific References
- Lalande S et al. (2024). Shoulder osteoarthritis: A survey of current (2024) UK physiotherapy practice. Musculoskeletal Care. 22:e1917. DOI | PubMed
- Lin I et al. (2020). What does best practice care for musculoskeletal pain look like? Eleven consistent recommendations from high-quality clinical practice guidelines: systematic review. Br J Sports Med. 54:79-86. DOI | PubMed
- Breckenridge JD et al. (2011). Shoulder Pain and Disability Index (SPADI). J Physiother. 57:197. DOI | PubMed
- Lo HHM et al. (2024). Immersive and Nonimmersive Virtual Reality-Assisted Active Training in Chronic Musculoskeletal Pain: Systematic Review and Meta-Analysis. J Med Internet Res. 26:e48787. DOI | PubMed
- Tomás CC et al. (2016). Proceedings of the 3rd IPLeiria’s International Health Congress : Leiria, Portugal. 6-7 May 2016. BMC Health Serv Res. 16 Suppl 3:200. DOI | PubMed