What are the other Names for this Condition? (Also known as/Synonyms)

• OA of Shoulder
• Shoulder Osteoarthritis

What is Osteoarthritis of Shoulder? (Definition/Background Information)

• Osteoarthritis (OA) is a painful joint disorder characterized by the progressive degeneration of the articular cartilage that covers the bone surface of joints. It is mostly observed in middle-aged and older adults
• Osteoarthritis of Shoulder affects the shoulder joints, especially the acromioclavicular (AC) joint or the glenohumeral joint. The AC joint is the most common shoulder joint involved; it is more frequently affected than the glenohumeral joint
• In this condition, the cartilage that cushions the shoulder joints gradually wears down, resulting in pain, stiffness, and weakness of the shoulder. This is followed by the formation of bone spurs (abnormal bone growths) at the location
• Even though less common than osteoarthritis of the knee or hip joint, Osteoarthritis of the Shoulder can severely affect one’s ability to perform simple tasks using one’s arms, such as driving a vehicle, throwing a ball, or combing one’s hair, thereby affecting the overall quality of life
• Early and adequate treatment is necessary to control the progression of Osteoarthritis of Shoulder. The treatment associated with the condition includes both nonsurgical and surgical methods. The prognosis of Shoulder Osteoarthritis is good, with early treatment in a majority of individuals

Who gets Osteoarthritis of Shoulder? (Age and Sex Distribution)

• Osteoarthritis of Shoulder may occur in individuals of all ages, races, ethnic groups, and belonging to any gender
• Both males and females are affected, although many cases are observed in middle-aged and elderly women
• No race or ethnic group preference is observed

What are the Risk Factors for Osteoarthritis of Shoulder? (Predisposing Factors)

The risk factors for Osteoarthritis of Shoulder may depend on whether the condition is primary (caused by age-related wear and tear of the joint) or secondary (due to an underlying condition or disorder).

The risk factors for primary osteoarthritis may include:

• Advancing age: Osteoarthritis is rarely diagnosed in individuals under 40 years old. However, since it is a gradually progressing condition, the risk of developing it usually increases with age
• Women are more susceptible to the condition than men, especially after menopause
• Individuals who sustain a joint injury while participating in rough/high-impact sports such as football, tennis, basketball, soccer, wrestling, rugby, hockey, skiing, and snowboarding
• Abnormal pressure on the joints due to excess body weight (obesity)
• Repetitive stress on the joint associated with certain occupations, such as farming or construction-related work, can increase the risk

The risk factors for secondary osteoarthritis may include:

• Prior joint injury or infection 
• Rheumatoid arthritis
• Systemic lupus erythematosus
• Acromegaly
• Hemochromatosis
• Alkaptonuria
• Secondary syphilis
• Lyme disease
• Ankylosing spondylitis 
• Psoriatic arthritis
• Avascular necrosis
• Many of the autoinflammatory diseases, such as systemic juvenile idiopathic arthropathy, Behçets disease, and adult-onset Still’s disease
• Hypermobility syndromes lead to increased range of motion at joints. This excessive mobility leads to increased wear and tear on cartilage, and subsequently to early onset secondary osteoarthritis
  • Some conditions are hereditary, such as Ehlers-Danlos syndrome, Marfan syndrome, Stickler syndrome, osteogenesis imperfecta, and others
  • Down’s syndrome, cerebral palsy, and disorders leading to poor muscle tone also lead to increased joint motion
• Wilson’s disease: A copper transport disease with prominent liver and neurologic findings
• Gout and pseudogout: Medical conditions caused by high levels of uric acid or calcium crystals in the joint spaces
• Paget’s disease of bone: A rare, chronic bone disorder characterized by abnormal growth and deformity of the bones
• Hypothyroidism: A medical condition characterized by the body’s inability to produce enough thyroid hormone
• Individuals with poorly-controlled diabetes; a chronic medical condition characterized by excessive levels of sugar in blood
• Genetic disorders that cause improper formation of the joints

It is important to note that having a risk factor does not mean that one will get the condition. A risk factor increases one’s chances of getting a condition compared to an individual without the risk factors. Some risk factors are more important than others.

Also, not having a risk factor does not mean that an individual will not get the condition. It is always important to discuss the effect of risk factors with your healthcare provider.

What are the Causes of Osteoarthritis of Shoulder? (Etiology)

Currently, the underlying cause of Osteoarthritis of Shoulder is unknown. However, certain causative factors associated with the condition include:

• Any injury to the shoulder joint while participating in sports such as football, tennis, basketball, soccer, wrestling, rugby, hockey, skiing, and snowboarding
• Repetitive stress on the joint from certain occupations, such as carpentry or painting
• Obesity causing abnormal stress on the joints
• Some arthritic disorders have a genetic prevalence: Individuals with an immediate family member or relative having a history of osteoarthritis may also develop this disorder
• Progressive damage of the joint cartilage (due to various reasons) is a key factor. The cartilage damage initiated by a cause factor activates an inflammatory response, which leads to further joint destruction

What are the Signs and Symptoms of Osteoarthritis of Shoulder?

Osteoarthritis of Shoulder is a gradual degenerative disorder that usually worsens over time. The common signs and symptoms of the condition include:

• Noticeable pain and tenderness in the shoulder joint; it is difficult to lift an object or rotate one’s arm
• The pain may be sometimes severe enough to interfere with sleep
• Feeling of weakness in the involved shoulder
• Swelling in the shoulder
• Any of the four joints of the shoulder may be affected, but the two most frequently involved joints are the:
  • Acromioclavicular (AC) joint
  • Ball and socket joint or the glenohumeral joint
• Stiffness and reduced mobility of the shoulder joint
• Formation of bone spurs or osteophytes around the joint

How is Osteoarthritis of Shoulder Diagnosed?

Diagnostic methods that a physician may use to help diagnose Osteoarthritis of Shoulder may include:

• Physical examination: The physician will perform a thorough physical examination to determine, if the individual has osteoarthritis. In addition to this, a complete medical history may aid in arriving at a diagnosis
• X-ray of the affected shoulder joint: X-rays use radiation in order to produce images of the joint, which can help the physician rule out other possible causes for pain and discomfort
• Various blood tests to rule-out other conditions that may cause similar symptoms
• Joint fluid analysis of affected joint: Occasionally, fluid may accumulate around the shoulder joint. Analysis of this fluid will give clues regarding the cause of the joint fluid accumulation, which causes pain and disability. A needle is inserted into the joint space and the accumulated fluid aspirated with a syringe. It is then sent to a laboratory for analysis, to determine:
  • The type of cells present in the fluid
  • Chemical composition of the fluid
  • The presence of crystals (examination of fluid under a microscope)
• If an infection is suspected as the cause of accumulation of the joint fluid, then a joint fluid culture may be performed. The culture of joint fluid will confirm an infection of the shoulder joint, as the cause of arthritis (termed infective arthritis)
• Ultrasound imaging of the shoulder joint: The use of high-frequency sound waves to generate a thorough image of the affected joint
• CT, MRI scan of the affected joint

Many clinical conditions may have similar signs and symptoms. Your healthcare provider may perform additional tests to rule out other clinical conditions to arrive at a definitive diagnosis.

What are the possible Complications of Osteoarthritis of Shoulder?

Osteoarthritis of Shoulder is a progressive condition that gradually worsens over time. The complications of the condition may include:

• Chronic pain and stiffness within the joint, which may prevent individuals from performing their daily routine activities
• Permanent disability in the affected shoulder
• Decreased quality of life

How is Osteoarthritis of Shoulder Treated?

The treatment of Osteoarthritis of Shoulder includes nonsurgical and surgical methods. A healthcare provider may start with non-surgical treatment methods, before adopting surgical procedures and techniques. These include:

• Rest: Any activity that aggravates the joint condition further should be avoided. The physician usually advises to refrain from all such activities until the symptoms get better
• Heat and ice: Applying a damp heated towel or ice to the joint can help reduce pain and swelling
• Splint or brace: A physician may prescribe some type of padded splint or cast to help keep the joint in a stable position, especially while sleeping
• Non-steroidal anti-inflammatory medication: Medications, such as ibuprofen and naproxen, can help decrease the joint pain and swelling
• Topical non-steroidal medications have been shown to improve osteoarthritis at specific locations. Application twice a day is required for a month, then daily, to attain relief
• Corticosteroid medications, such as prednisone, help provide temporary relief of symptoms and in improving the range of motion within the joint. Corticosteroids can be given systemically or injected directly into a specific affected joint. It is important to note that corticosteroid injections may only give temporary relief. Repetition of such injections can ultimately lead to further joint injury
• Viscosupplementation: Normal fluid within a joint contains a material called hyaluronic acid. When a joint is affected by osteoarthritis, a reduction of hyaluronic acid level occurs within the joint. Such a decreased acid level will decrease the ability of the joints to lubricate. Viscosupplementation is a minimally-invasive technique that is commonly used when treating osteoarthritis. During this procedure, small doses of hyaluronic acid are injected into the arm/leg to relieve pain
• Physical therapy: After the symptoms have decreased, it is important to begin some light motion exercises (shoulder joint exercises). Physical therapy may help restore strength, as well as provide flexibility to the muscles

Surgical treatment measures include:

• Joint fusion: Joint fusion is a surgical technique that involves the removal of the arthritic part within the joint and fusing two surrounding bones together. The purpose of this procedure is to relieve pain, stabilize the joint, and regain some range of motion in the affected joint
• Total arthroplasty (shoulder joint replacement technique): It is a surgical intervention tool in which the joint is completely removed. The arthritic joint that is removed is then replaced by a metal and plastic prosthetic implant. A physician will recommend this surgical procedure, if the degenerative disorder affects the entire joint

How can Osteoarthritis of Shoulder be Prevented?

A few recommendations to help prevent Osteoarthritis of Shoulder include:

• Individuals who maintain a healthy diet, may decrease the chance of developing this condition
• Some evidence exists that adherence to a Mediterranean diet leads to improvement in in osteoarthritis
• Estrogen replacement therapy can decrease the incidence of osteoarthritis after menopause in women
• Using correct posture and tools that decrease stress on joints in the work place can decrease incidence of the condition due to occupational causes
• Undertake a proper treatment of gout
• Prompt and adequate treatment of individuals with Paget’s disease
• In individuals with hypothyroidism, a prompt treatment of the thyroidal condition can lower one’s risk
• Proper treatment of diabetes
• Maintaining a healthy body weight can help prevent/avoid abnormal pressure on the joints
• Individuals, who participate in any high-risk sports, such as football and basketball, should wear appropriate safety gear to help prevent serious injuries to their joints

What is the Prognosis of Osteoarthritis of Shoulder? (Outcomes/Resolutions)

The long term prognosis of Osteoarthritis of the Shoulder depends on the severity of this degenerative condition.

• If osteoarthritis is detected early and proper aggressive treatment provided; then, the prognosis is good in a majority of individuals, if no serious complications are noted
• In general, without treatment, a high percentage of individuals who develop this condition may experience a lifetime of gradual degeneration that can be debilitating

Additional and Relevant Useful Information for Osteoarthritis of Shoulder:

The following DoveMed website link is a useful resource for additional information:

https://www.dovemed.com/health-topics/orthopedc-disorders/