What causes de Quervain’s tendonitis?
The cause of de Quervain’s tendonitis is an irritation of the tendons at the base of the thumb, usually caused by taking up a new, repetitive activity. New Mothers are especially prone to this type of tendonitis; caring for an infant often creates awkward hand positioning and hormonal fluctuations associated with pregnancy, and nursing further contributes to its occurrence , A wrist fracture can also predispose a patient to de Quervain’s tendonitis, because of increased stresses across the tendons.
Signs and symptoms of de Quervain’s tendonitis
Pain over the thumb-size of the wrist is the main symptom. The pain may appear either gradually or suddenly, and pain is located at the first dorsal compartment at the wrist. Pain may radiate down the thumb or up the forearm. Hand and thumb motion increases pain especially with forceful grasping or twisting. Swelling over the base of the thumb may include a fluid-filled cyst in this region. There may be an occasional “catching” or “snapping” when moving the thumb. Because of the pain and swelling, motion such as pinching may be difficult. Irritation of the nerve lying on top of the tendon sheath may cause numbness on the back of the thumb and index finger.
Diagnosis of de Quervain’s tendonitis
Tenderness directly over the tendons on the thumb-side of the wrist is the most common finding. A test is generally performed in which the patient makes a fist with the fingers clasped over the thumb. The wrist is then bent in the direction of the little finger. This maneuver can be quite painful for the person with de Quervain’s tendonitis.
Treatment of de Quervain’s tendonitis
The goal is to relieve the pain caused by the irritation and swelling. Your doctor may recommend resting the thumb and wrist by wearing a splint. Oral anti-inflammatory medication may be recommended. A cortisone-type of steroid may be injected into the tendon compartment as another treatment option. Each of these non-operative treatments help reduce the swelling, which typically relieves pain over time. In some cases, simply stopping the aggravating activities may allow the symptoms to go away on their own.
When symptoms are severe or do not improve, surgery may be recommended. The surgery opens the compartment to make more room for the inflamed tendons, which breaks the vicious cycle where the tight space causes more inflammation. Normal use of the hand can usually be resumed once comfort and strength have returned. Your hand surgeon will advise the best treatment for your situation.