1. Pain at the front of the radial side of the wrist may be caused by various lesions of the tendon and sheath of the flexor carpi radialis tendon.

2. The diagnosis may be established by testing resisted movement at the wrist and by the effect of injecting local anaesthetic into the tendon sheath.

3. In women over the age of fifty the lesion is associated with osteoarthritis of the joint between the scaphoid and the trapezium.

4. Osteoarthritis of the joint between the scaphoid and the trapezium is found in about 25 per cent of women over the age of fifty.

5. If the pain is not relieved by simple conservative measures it can usually be cured by incision of the tendon sheath.

6. The histological changes in the tendon sheath are similar to those found in tenovaginitis of the abductor pollicis longus and tibialis posterior tendons.