De Quervain syndrome
|de Quervain Syndrome|
|Classification and external resources|
Finkelstein's test for DeQuervain's tenosynovitis
De Quervain syndrome (French pronunciation: [də kɛʁvɛ̃]; also known as BlackBerry thumb, gamer's thumb, washerwoman's sprain, radial styloid tenosynovitis, de Quervain disease, de Quervain's tenosynovitis, de Quervain's stenosing tenosynovitis, mother's wrist, or mommy thumb), is a tenosynovitis of the sheath or tunnel that surrounds two tendons that control movement of the thumb.
Symptoms are pain, tenderness, and swelling over the thumb side of the wrist, and difficulty gripping.
The cause of de Quervain's disease is not established. Evidence regarding a possible relation with occupational risk factors is debated. A systematic review of potential risk factors discussed in the literature did not find any evidence of a causal relationship with occupational factors. Proponents of the view that De Quervain syndrome is a repetitive strain injury consider postures where the thumb is held in abduction and extension to be predisposing factors. Workers who perform rapid repetitive activities involving pinching, grasping, pulling or pushing have been considered at increased risk. Specific activities that have been postulated as potential risk factors include intensive mouse/trackball use and typing, as well as some pastimes, including bowling, golf and fly-fishing, piano-playing, and sewing and knitting.
Women are affected more often than men. The syndrome commonly occurs during and after pregnancy. Contributory factors may include hormonal changes, fluid retention and—more debatably—lifting.
The two tendons concerned are the tendons of the extensor pollicis brevis and abductor pollicis longus muscles. These two muscles, which run side by side, have almost the same function: the movement of the thumb away from the hand in the plane of the hand—so called radial abduction (as opposed to movement of the thumb away from the hand, out of the plane of the hand, or palmar abduction). The tendons run, as do all of the tendons passing the wrist, in synovial sheaths, which contain them and allow them to exercise their function whatever the position of the wrist. Evaluation of histological specimens shows a thickening and myxoid degeneration consistent with a chronic degenerative process. The pathology is identical in de Quervain seen in new mothers.
Finkelstein's test is used to diagnose de Quervain syndrome in people who have wrist pain. To perform the test, the examining physician grasps the thumb and the hand is ulnar deviated sharply, as shown in the image. If sharp pain occurs along the distal radius (top of forearm, about an inch below the wrist; see image), de Quervain's syndrome is likely.
Differential diagnoses include:
- Osteoarthritis of the first carpo-metacarpal joint
- Intersection syndrome—pain will be more towards the middle of the back of the forearm and about 2–3 inches below the wrist
- Wartenberg's syndrome
The management of de Quervain’s disease is determined more by convention than scientific data. From the original description of the illness in 1895 until the first description of corticosteroid injection by Jarrod Ismond in 1955, it appears that the only treatment offered was surgery. Since approximately 1972 the prevailing opinion has been that of McKenzie (1972) who suggested that corticosteroid injection was the first line of treatment and surgery should be reserved for unsuccessful injections. A systematic review and meta-analysis published in 2013 found that corticosteroid injection seems to be an effective form of conservative management of de Quervain's syndrome in approximately 50% of patients, although more research is needed regarding the extent of any clinical benefits. Efficacy data are relatively sparse and it is not clear whether benefits affect the overall natural history of the illness.[medical citation needed]
Most tendinoses are self-limiting and the same is likely to be true of de Quervain's although further study is needed.[medical citation needed]
Palliative treatments include a splint that immobilized the wrist and the thumb to the interphalangeal joint and anti-inflammatory medication or acetaminophen. Systematic review and meta-analysis do not support the use of splinting over steroid injections. 
Surgery (in which the sheath of the first dorsal compartment is opened longitudinally) is documented to provide relief in most patients. The most important risk is to the radial sensory nerve.
Some physical and occupational therapists suggest alternative lifting mechanics based on the debatable theory that the condition is due to repetitive use of the thumbs during lifting such as seen in new mothers picking up their child. Physical/Occupational therapy can suggest activities to avoid base on the theory that certain activities might exacerbate one's condition, as well as instruct on strengthening exercises based on the theory that this will contribute to better form and use of other muscle groups, which might limit irritation of the tendons. This approach may risk reinforcing catastrophic thinking (pain catastrophizing) and kinesiophobia. [medical citation needed]
Some physical and occupational therapists use other treatments based on the rationale that they reduce inflammation and pain and promote healing: UST, SWD, or other deep heat treatments, as well as TENS, dry needling, or infrared light therapy, and cold laser treatments. However, the pathology of the condition is not inflammatory (see above) and these treatment are unproved and best considered experimental.
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- DeQuervain's Syndrome: Medical Imagery - Medical Art and Illustration
- The Sports Medicine Patient Advisor: De Quervain's Tenosynovitis Rehabilitation Exercises
- -1744437193 at GPnotebook