Bursitis olecraniana

Elbow with olecranon bursitis

© User:NJC123, via Wikimedia Commons

What is olecranon bursitis?

Olecranon bursitis, also called elbow bursitis, is when the fluid-filled sac behind the elbow, called the olecranon bursa, becomes inflamed, swollen, and painful.

What is a bursa?

A bursa is a small sac that contains a small amount of fluid. The fluid is similar to the fluid in joints (synovial fluid). There are several bursae in the body, including one just over the olecranon. Bursae help to make movement smooth between bones which 'stick out' and the overlying skin.

Normally the bursa cannot be felt but when it gets inflamed, it becomes larger so that you can see the bulge and feel a soft lump over the back of your elbow. It is sometimes said to resemble the shape of a goose egg or a golf ball, although it may come in different shapes and sizes.

Diagram: elbow showing olecranon bursa

You cannot normally feel or see a bursa. If the olecranon bursa is inflamed then it causes a thickness and swelling over the back of the elbow. The bursa may also fill with fluid and it then looks like a small soft ball.

There are two types of olecranon bursitis:

• Infected (septic).

• Non-infected (aseptic).

It is not always obvious which type it is, but the symptoms tend to be slightly different. The non-infected type is the most common.

Aseptic bursitis symptoms

Most cases of aseptic olecranon bursitis are painless, or are only mildly painful. The movement of the elbow joint is not affected. It may hurt to put any pressure on your elbows - for example, if you lean your elbow on a hard surface. It may also hurt a little when you bend your elbow.

The swelling looks the same colour as the rest of your skin, or slightly pink. It may feel the same temperature as the rest of your skin, or may be slightly warm. The swelling is soft rather than hard when you touch it, and you may be able to feel the fluid moving within it when you press on it.

A bursitis associated with another condition such as artritis may not be painful itself but you will have other symptoms related to the arthritis, such as joint pains.

Septic olecranon bursitis symptoms

If the bursa is infected then you will usually develop:

• Dolor.

• Redness and tenderness behind the elbow.

• Redness and swelling spreading away from the elbow.

• Una temperatura alta (fiebre).

• A graze or wound on the skin over the swelling, where the germs (bacteria) entered.

There are a number of possible causes of olecranon bursitis:

• Mild but repeated injury is thought to be the common cause of olecranon bursitis. For example, people who lean on their elbows a lot cause friction and repeated mild injury over the olecranon.

• Repeated elbow movements may be a cause in certain athletes. For example, those whose sports involve throwing by raising the arm above the head (such as cricket or baseball players, javelin throwers) or weightlifters.

• One-off injury such as a blow to the back of the elbow may set off inflammation.

• Artritis. One or more bursae may become inflamed as part of a generalised arthritis. (Nota: most cases of olecranon bursitis are not associated with arthritis.) Types of arthritis which can be associated with bursitis include artritis reumatoide, gota y espondilitis anquilosante.

• Infección of a bursa. This may occur if there is a cut in the skin over a bursa, which allows in germs (bacteria). Some illnesses may make infection more likely - for example, diabetes or conditions where the immune system does not work as well as normal. There is not always an obvious cause for the infection.

• Unknown (idiopathic). Many cases occur for no apparent reason. However, it is possible that some of these are due to a mild injury that has been forgotten.

If you have a straightforward case of olecranon bursitis, the doctor may be able to diagnose it without any tests. The swelling is very typical and because the elbow is so close to the skin, it is usually quite easy to feel.

However, other tests are sometimes needed to rule out other causes of elbow swelling, such as infection (artritis séptica), gout or rheumatoid arthritis.

Tests which might be needed include análisis de sangre and an ultrasonido. If you have had a significant injury, an radiografía might be needed to make sure there is no break (fracture). Also, sometimes people who have had repeated episodes of olecranon bursitis develop an olecranon spur - a bony growth - which can be seen on an X-ray.

If infection ('septic olecranon bursitis') is suspected, the bursal fluid in the swelling may be drained (aspirated) by the doctor. This may be done by your GP in the surgery in some cases.

A sample is then sent to the lab to see which germs (bacteria) are causing the infection. This can then help guide the right treatment for you.

Your GP may often be able to diagnose and treat you without you needing a referral to a specialist. However, if there is doubt about the diagnosis, or if you have an associated condition such as rheumatoid arthritis, you may be referred.

Also if your GP is not practised at aspirating these swellings, he or she may refer you to someone with plenty of experience.

In many cases, olecranon bursitis clears up on its own with simple care such as resting the elbow, avoiding pressure on it, and applying ice packs. Some people find a compression bandage on the elbow makes it more comfortable.

As long as there is no infection, over time most cases of olecranon bursitis will then settle on their own.

Other treatments advised in some cases include:

• Anti-inflammatory medication (such as ibuprofeno, naproxeno, diclofenaco, etc) may be prescribed to reduce inflammation and swelling. Paracetamol is another option if the elbow is painful.

• Draining the fluid (aspiration) can be done by a healthcare professional with a sterile needle and syringe if a lot of fluid builds up. However, the fluid tends to build up again after being drained. Therefore, you may be advised to wear a tight pressure bandage for a while after the fluid has been drained, to prevent it building up again.

• A steroid injection into the bursa may cure the problem. Steroids are good at reducing inflammation. However, steroid injections sometimes cause infection in the bursa.

• Cirugía to remove the bursa is an option if the above do not work.

• Antibióticos are needed if the cause of the bursitis is an infection. Normally an antibiotic such as flucloxacillin o eritromicina is used until the results of the tests on the aspirated fluid are available. Then the choice of treatment can be changed if necessary and directed at the exact germs (bacteria) causing the infection. Flucloxacillin and erythromycin treat the most common types of germs which cause olecranon bursitis.

If you protect the elbow from excessive friction and rubbing it may prevent further bouts of olecranon bursitis. This may mean using elbow pads if you need to lean on your elbows whilst working.

Not usually. If you tend to lean on your elbows then avoiding this may make it less likely that an olecranon bursitis will come back again. Try to avoid this position, or use a cushion or pad so your elbows don't rest on a hard surface.