Shoulder arthritis causes pain and stiffness in the shoulder and typically occurs in people over the age of 50. The hallmark is pain and reduced range of motion. Arthritis can result in painful which may be constant or increase with activity. The diagnosis is typically obvious on X-rays which show reduced joint space and bone spurs.
Causes and Anatomy
Arthritis is loss of the cartilage that normally pads the joint. The most common causes of shoulder arthritis are age and genetics. In addition, arthritis can occur after trauma. For instance, people who dislocate their shoulder at a young age are more likely to have arthritis in later years. Other medical conditions such as rheumatoid arthritis may increase the risk of shoulder arthritis.
The two common locations for arthritis are the acromioclavicular (AC) joint and the glenohumeral joint. Arthritis of the AC joint is essentially universal and is rarely painful. It does not result in loss of motion. Glenohumeral arthritis, on the other hand, is less common and affects the ball-and-socket joint. This handout focuses on glenohumeral arthritis.
In the case of mild arthritis conservative treatment should be attempted. Severe arthritis may requires surgery if someone is in good health and has limitation in quality of life. Deciding to perform surgery is based on quality of life rather than X-rays. For the most part arthritis progresses slowly over years. While progression that changes treatment can occur, for the most part, this is a slow process. Age is also a factor in treatment, but in today’s world health is more important than age. Because of the diagnosis is obvious on X-rays an MRI or CT scan is only needed if surgery is being considered.
Treatment options include:
- Medications: Anti-inflammatories such as ibuprofen (Motrin or Advil) and naproxen (Aleve) are used to reduce pain and inflammation. The max does for ibuprofen is 800 mg three times per day. The max does for naproxen is 500 mg twice daily. Prolonged usage should be avoided and these should be taken with food since they can affect the stomach lining. If one experiences an upset stomach these should be stopped.
- Injection: An injection of steroid (cortisone) into the glenohumeral joint may be used to provide pain relief. One of the keys is the location of the injection. Most non-orthopaedic providers place an injection into the subacromial space between the rotator cuff and acromion bone when they do an injection. However, the proper location of an injection for arthritis is into the shoulder joint itself which lies beneath the rotator cuff. I perform glenohumeral joint injections with an ultrasound machine. This allows direct visualization of the joint and improved accuracy of the injection. Up to 3 injections over a 2 year period are allowed. Beyond this there are typically diminishing returns and excessive injections may be detrimental to the tissue.
- Stretching: In most cases I do not prescribe aggressive strengthening with physical therapy as this can aggravate the arthritis. Rather, gentle stretching is encouraged. The most essential stretches are provided at the end of this document.
- Surgery: In the event that symptoms do not improve with conservative care, surgery is an option. Two options exist.
Alternative injections include Toradol (an anti-inflammatory agent similar to ibuprofen), prolotherapy, or platlet-rich plasma (PRP). I use Toradol in people who do not tolerate steroids. Prolotherapy involves injecting a substance such as sugar into tissue to “stimulate a healing response.” I do not perform prolotherapy as it has not been shown to improve symptoms in shoulder arthritis. PRP involves taking a small amount of blood from a patient, spinning in a centrifuge to separate the growth factors from the red blood cells, and then injecting the growth factors back into the shoulder to potentially decrease pain. While PRP has anti-inflammatory properties, it has not been shown to decrease pain in shoulder arthritis. Studies have only been done on the knee, where it has been shown to be effective. Therefore, it is not covered by insurance and is an out-of-pocket expense. Typically a series of 3 injections are performed at weekly intervals for 3 weeks.
The first is an arthroscopic procedure. This procedure requires general anesthesia, takes about 45 minutes to perform, and patients go home the same day. Two to three small incisions are made in the shoulder, a scope is inserted, and the adhesions and bone spurs are directly released. This is most likely to be successful in patients with mild arthritis. While the procedure is low risk, it does not alter the underlying condition. A sling is worn for 2 weeks after surgery and immediate motion is encouraging. Strengthening is allowed at 4 to 6 weeks and full activities are progressed at 3 months after surgery.
The second option is shoulder replacement. Many people have heard of a hip or knee replacement but don’t know about shoulder replacement. While less common than hip or knee replacement, the surgery is very effective and has a lower risk of complication than hip or knee replacement. This procedure requires general anesthesia with an incision in front of the shoulder and takes about 1 hour to perform. The ball and the socket joint is resurfaced with a metal and high-strength plastic prosthetic implant in order to remove pain and improve range of motion. Patients typically stay 1 night in the hospital but may go home the same day if they are in good health (typically for people under the age of 70). A sling is worn for 4 weeks after surgery with use of the elbow, wrist, and hand only for general activities. The patient may shower 2 days after surgery. Absorbable sutures are placed so that there is no need for suture removal. The sling is removed at 4 weeks and range of motion is started. Strengthening starts at 8 weeks and full activities are allowed at 4 months. The success rate is over 90%. Risks include infection (less than 1% in my patients), and component loosening over time (90% of the implants are still in 10 years after surgery and 70-80% are in 20 years after surgery).
For more information see the handout on the list of commonly asked questions after shoulder replacement.