II. Causes
- Primary Shoulder Osteoarthritis (Idiopathic)
- Secondary Shoulder Osteoarthritis due to Atraumatic Osteonecrosis
- Toxins (e.g. Alcohol Abuse, Corticosteroids, specific cytotoxins, radiation)
- Obesity
- Lysosomal Storage Disease (e.g. Gaucher's Disease)
- Sickle Cell Anemia
- Secondary Shoulder Osteoarthritis due to Inflammation
- Gout, Pseudogout or other crystal Arthropathy
- Following Septic Arthritis
- Rheumatoid Arthritis
- Rotator Cuff Injury
- Secondary Shoulder Osteoarthritis due to Surgery or Trauma
- Shoulder Dislocation or Shoulder Subluxation
- Prior Proximal Humerus Fracture with malunion
- Avascular necrosis
- Prior surgery with complications related to hardware, capsulorrhaphy, capsule tightening
III. Epidemiology
- Less common site for osteoarthritic changes
- Age of onset typically >50 years old
IV. Risk Factors
- Chronic rotator cuff disease
- Recurrent Shoulder Dislocations
- Severe ShoulderFractures
- Prior Shoulder surgery
V. Symptoms
- Gradual onset of pain and stiffness
- Stiffness may significantly limit function when advanced
- Chronic Shoulder Pain
- Crepitus
VI. Signs
- Limited Shoulder Range of Motion - active and passive
VII. Differential Diagnosis
- See Shoulder Pain
- See Rheumatologic Conditions Affecting the Shoulder
- Rheumatoid Arthritis (later stages)
VIII. Imaging
- See Shoulder XRay
- Signs of Osteoarthritis on XRay: Degenerative changes
- Axillary view best demonstrates joint space narrowing
- Subchondral sclerosis and osteophytes may also be seen
IX. Management
- See Osteoarthritis
-
Analgesics
- Acetaminophen 1000 mg orally 2 to 4 times daily
- NSAIDs
- Supplements
- Glucosamine 500 mg orally three times daily
-
Shoulder Intraarticular Corticosteroid Injection
- Consider in refractory cases, but studies do not show significant benefit
- Physical Therapy
- Avoid aggressive therapy (may exacerbate Osteoarthritis)
- Goal is to maintain function and pain control
X. Management: Surgical intervention in severe or refractory cases
- Joint preservation surgery (in early disease and young patients under age 60)
- Arthroscopic glenohumeral Debridement and capsular release (most common)
- Corrective osteotomies
- Interposition arthroplasty
- More aggressive surgical interventions for severe Osteoarthritis
- Arthrodesis (fusion of humeral head to glenoid) for severe cases under age 50 years
- Hemiarthroplasty (Humerus replacement only)
- Total Shoulder Arthroplasty
XI. Prevention
- Control comorbid conditions (e.g. Diabetes Mellitus)