Overview
what it is and why it mattersDe Quervain's tenosynovitis is irritation and swelling of two thumb tendons that share a tight tunnel just above the wrist on the thumb side. Repeated pinching, gripping, or lifting can inflame the tendons and the tunnel they pass through, and the swelling makes every thumb motion painful. New parents see this constantly from lifting infants — it's so common it's been nicknamed mommy thumb.
The hallmark is sharp pain right over the bony bump on the thumb side of your wrist (the radial styloid), often with visible swelling, made worse by moving the thumb or bending the wrist toward the thumb side.
Symptoms
what you may noticeThe main symptom is sharp pain right over the bony bump on the thumb side of your wrist (the radial styloid) that flares every time you grip, pinch, or twist. Picking up a coffee mug, turning a doorknob, wringing out a washcloth — anything that loads the thumb tendons reproduces it. New parents often notice it first when lifting their baby with the wrists angled inward.
You may see visible swelling or a small fluid-filled bump over the tendon tunnel at the wrist. In more established cases the tendons can develop a catching or squeaking sensation as they slide through the narrowed tunnel. The pain sometimes radiates up the forearm or down into the thumb, and grip strength drops noticeably because the pain prevents you from squeezing hard.
Diagnosis
exam first, imaging secondThe classic test is the Finkelstein test: tuck your thumb into your palm, wrap your fingers around it, then bend your wrist toward your pinky side. Sharp pain right at the radial styloid is a positive sign. Ultrasound can show the swollen tendon sheath and is also useful for guiding the injection. X-rays are added to rule out arthritis at the wrist or thumb base, which can mimic the symptoms.
Treatment Path
how care progresses at OSI1
Thumb spica splinting
A thumb spica splint — one that immobilizes the wrist AND the thumb — gives the inflamed tendon sheath a chance to settle. Worn most of the time during the acute phase.
2
Activity modification
Avoid the moves that drove the inflammation: repetitive pinching, lifting with your wrist bent toward the pinky side, and repeated thumb motions through the day.
3
Corticosteroid injection
An corticosteroid injection into the inflamed tunnel — guided in real time by ultrasound for accuracy — is highly effective and often cures the condition in a single shot.
NSAIDs / ice
NSAIDs like ibuprofen and ice as adjuncts for acute pain control alongside the splint.
Surgical Options at OSI
if non-operative care isn't enoughSurgery is reserved for cases where two injections haven't worked, or where the tunnel itself has thickened so much from chronic irritation that injections can't help — a quick procedure to release the roof of the tunnel and free the tendons.
Providers Who Treat De Quervain's Tenosynovitis
sports-medicine team
Further Reading
authoritative sourcesExternal patient-education references and related OSI pages for additional background: