Osteoarthritis of the base of the thumb is a condition in which the cartilage a the bones at the base of the thumb has thinned or even disappeared completely. Osteoarthritis causes inflammation and especially pain.
Osteoarthritis of the base of the thumb is more common in women as early as age 40. Sometimes prolonged repetitive movements of the thumb and certain working conditions can accelerate osteoarthritis. A hereditary background may also be present.
Symptoms
Mainly the symptoms are pain a the base of the thumb and pain with certain gripping movements (opening a bottle or jar, tying a shirt,...) as well as reduced mobility of the thumb. As a result, the function of the hand deteriorates and we usually see external swelling at the base of the thumb. If the osteoarthritis worsens further, a deformity of the thumb develops.
Diagnosis
The diagnosis is made through a clinical examination and via imaging (RX or CT).
The treatment in the initial phase consists of rest, pain medication and a thumb brace. If this is insufficient, an injection of cortisone or gel may be given at the consultation to help with the pain.
If the complaints are insufficiently controlled or come back quickly, surgery is usually necessary.
There are 2 types of surgery possible, depending on the severity of the osteoarthritis. Either the bone, which is affected with osteoarthritis, is removed and replaced with its own tendon from the forearm (Burton Pellegrini surgery) or the joint at the base of the thumb is replaced with a prosthesis.
For both procedures, a one-night stay is recommended, especially to properly manage pain symptoms the first night. After the procedure, a cast is placed. After the cast, the thumb may be returned to progressively normal use, though initially with a protective brace. It is best to avoid heavier physical exertion during the first 2 months.
General treatment
In the early stages of the condition, anti-inflammatories and rest can sometimes help. If insufficient, additional injections of cortisone may be given. If this is insufficient or if the symptoms return quickly, we usually proceed to surgery. This surgery is possible through a day admission so you normally do not have to stay overnight. The intention is to be able to move and use the finger quickly after the operation. Usually we count about 6 weeks of rest during which no strenuous efforts should be made.