Extensor carpi ulnaris tendinopathy
Extensor carpi ulnaris tendinitis

In the case of this tendinopathy, the tendon of the muscle called the 'extensor carpi ulnaris' is affected. Often the tendon is inflamed through overuse. The symptoms are located on the top of the wrist, at the base of the little finger.

The tendon of the extensor carpi ulnaris runs along a bony nodule (the ulnar styloid process) located on the top of the wrist. This is the site where the pain is generally felt.

Description of the condition

The extensor carpi ulnaris tendon ensures that the wrist can be stretched and at the same time bent towards the little finger side. In addition, this tendon is also important for the stability of the wrist joint. The tendon runs through a tunnel of connective tissue. This tunnel holds the tendon firmly in place.

One of the abilities of the forearm is to turn the palm of the hand upwards. This movement is also called supination. The tendon can become jammed during the supination movement of the wrist. This generally happens in combination with bending the wrist and moving sideways towards the little finger side.

Cause and origin

The symptoms usually occur gradually as a result of overuse. Extensor carpi ulnaris tendinopathy is common in tennis players (racket sport players), baseball players, golfers and rowers.

Signs & symptoms

• Pain on the top and pinkie-side of the wrist.
  
• Swelling (of the tendon) sometimes occurs.
  
• Pain when extending the wrist against resistance, particularly if the wrist is simultaneously bent towards the little finger (ulnar deviation).
  
• The tendon may be sensitive if pressed on.

Diagnosis

The diagnosis is made on the basis of the patient's story and the physical examination. The strength, mobility and stability of the wrist will be examined. Sportsmen should also be examined for possible causes such as poor technique (for example, the tennis stroke).

An ultrasound or MRI can provide insight into the nature and severity of the complaint. This is especially important if the treatment is stagnant or does not work adequately. The anatomy on the little finger side is very complex and can have many individual differences. The tunnel through which the tendon runs can also cause problems.

Treatment

Usually, rest, possibly with a wrist brace, is sufficient to let the symptoms subside. After that, it is important to rebuild the strength, coordination and mobility around the wrist and to tackle the cause of the symptoms.

In addition, the mobility of all the small bones in the wrist area is often examined. These bones should be able to move well separately from each other. If there is no mobility in this area, the tendon can become strained because it has to work harder.

For athletes, it is important that the material and technique are also examined. This could mean that the tennis racket must be restrung or that the technique must be improved.

Exercises

You can check your symptoms using the online physiotherapy check or make an appointment with a physiotherapy practice in your area.

References
Campbell, D., Campbell, R., O'Connor, P. & Hawkes, R. (2013). Sports-related extensor carpi ulnaris pathology. A review of functional anatomy, sports injury and management. Br J Sports Med 2013;47:1105-1111.
Gerritsen, B.J. & Heerkens, Y.F. (2004). Anatomie in vivo van het bewegingsapparaat. Maarsen: Elsevier gezondheidszorg.
Montalvan, B., Parier, J ., Brasseur, J.L., Le Viet, D. & Drape, J.L. (2006). Extensor carpi ulnaris injuries in tennis players: a study of 28 cases. Br J Sports Med 2006;40:424–429.
Parmelee-Peters, K., Eathorne, S.W. (2005). The wrist: common injuries and management. Prim Care. 2005 Mar;32(1):35-70.
Schünke, M., Schulte, E. & Schumacher, U. (2005). Prometheus. Algemene anatomie en bewegingsapparaat. Houten: Bohn Stafleu Van Loghum.