De Quervain’s Tenosynovitis: Thumb-Side Wrist Pain

De Quervain’s tenosynovitis is a painful swelling of two thumb tendons where they run through a tight tunnel on the thumb side of your wrist. It hurts to lift, grip, or bend the wrist toward the little finger. A splint and one guided injection fix most cases. PRP is the next step when cortisone fails or keeps wearing off.

What causes De Quervain’s tenosynovitis?

Two tendons pull your thumb out and back. Near the wrist they slide through a short tunnel made of tough tissue. When that tunnel thickens, the tendons rub every time the thumb moves. The rubbing makes the lining swell, the swelling makes the tunnel tighter, and the loop feeds itself.

Repeated motion starts it. The classic case is a new mother, or a grandparent, lifting a baby under the arms with the thumbs spread wide, dozens of times a day. Others get it from scanning guns, hair shears, hammering, gaming, or texting with one thumb. The pain often starts in a busy month and then refuses to leave.

Your body chemistry decides how well the tendon recovers. Diabetes and insulin resistance stiffen tendons, slow repair, and make the tunnel tissue thicker. That is why this problem shows up so often next to trigger finger and frozen shoulder in people with high blood sugar. Sleep loss in the first year with a newborn makes every tissue heal slower too.

And there is the plain economics of it. A parent cannot stop lifting a baby. A warehouse worker cannot stop scanning. Advice that starts with “avoid using your thumb” does not survive a single shift, so the plan has to work while you keep living.

See every joint and tendon we treat with PRP, bone marrow or fat on our PRP injections in St. Louis page.

How do I know it is De Quervain’s and not arthritis?

The spot is the clue. De Quervain’s hurts on the thumb side of the wrist, about an inch above the base of the thumb. There may be a small, tender swelling there. Thumb arthritis aches lower, right at the joint where the thumb meets the hand. See thumb arthritis for how that one behaves.

A simple test helps. Tuck your thumb into your palm, close your fingers over it, and tip the wrist toward the little finger. If that sends a sharp pain up the thumb side of the wrist, the tendons in that tunnel are the likely source. Numbness or tingling is not part of De Quervain’s. If you have it, think about carpal tunnel syndrome or a nerve in the neck. Ultrasound in the office shows the swollen tendon sheath and tells us if a wall inside the tunnel splits the tendons in two, which changes how the injection is placed.

What is the usual treatment?

• A thumb splint. A splint that holds the thumb and wrist still for a few weeks lets the swelling settle.
• Changing how you lift. Scoop a baby with palms up, close to your body, instead of lifting under the arms. Use your whole hand on tools, not a pinch.
• Therapy. Once the pain calms, gentle loading rebuilds the tendons so the problem does not come straight back. See physical therapy.
• A guided injection. Cortisone placed into the tunnel under ultrasound works for most people, and works fast.

We are not against cortisone here. In one 2025 trial of 86 adults, cortisone gave faster relief in the first week, and PRP caught up by four to twelve weeks. A large review of 14 trials still ranks cortisone with a short period in a splint as the main first step.

When is PRP the better choice?

Cortisone has costs, and they land on certain people harder. In one trial of 60 patients, about a quarter of those given cortisone had side effects such as thinning of the fat under the skin, a pale patch of skin, or a flare of pain. None of the PRP group did, and both groups did equally well at one year. Cortisone also raises blood sugar for days, which matters if you have diabetes.

So we reach for PRP when cortisone has already failed or keeps wearing off, when the skin has already thinned, when blood sugar control is a concern, or when the tendon itself looks damaged on ultrasound. PRP is your own concentrated platelets, placed into the tendon sheath under ultrasound. It works by prompting repair, so it is slower than cortisone, and it tends to hold.

Diabetes cuts both ways. In a 2025 study of 67 patients, PRP gave good relief in most of them, but people with diabetes were much more likely not to respond. That is why we look at blood sugar at the same time as the wrist. Fixing the tendon while ignoring the sugar that stiffens it is half a job.

Over 90% of our accepted case-study patients see significant improvement. These are practice-reported figures from our own population, not trial outcomes, and individual results vary.

You stay awake, with local numbing medicine, and most people drive home. Expect soreness for about 48 hours. The number of injections follows how you respond. PRP is not covered by insurance, and HSA and FSA funds can generally be used. It is done at our regenerative clinic, 4477 Woodson Rd in St. Louis.

If nothing holds, a small surgery opens the tunnel. It is a reasonable last step, and we will tell you if you have reached it.

Frequently asked questions

Is De Quervain’s the same as carpal tunnel?

No. De Quervain’s is a tendon problem on the thumb side of the wrist and causes pain, not numbness. Carpal tunnel is a pinched nerve in the middle of the wrist and causes numbness and tingling in the fingers.

Why did my wrist start hurting after I had a baby?

Lifting a baby under the arms with the thumbs spread loads these exact tendons many times a day. Hormone shifts after pregnancy and poor sleep slow healing. Changing how you lift is part of the fix.

Will De Quervain’s go away on its own?

Mild cases can settle in weeks with a splint and fewer hard pinches. If it has lasted more than a month or two, or it wakes you at night, it usually needs treatment.

Is PRP better than a cortisone shot for De Quervain’s?

Not in the first week. Cortisone is faster. By three months the two are similar, and PRP has fewer skin side effects and does not raise blood sugar. We often use cortisone first and PRP when cortisone does not hold.

Can I work with a thumb splint on?

Most people can. A soft or low-profile splint fits under many work gloves. If your job needs limits for a while, we write the work note.

Sources

• Chowley P et al. Platelet-Rich Plasma versus Corticosteroid Injection for the Treatment of de Quervain Tenosynovitis: A Randomised Control Open Label Equivalence Trial. The journal of hand surgery Asian-Pacific volume, 2025. PubMed 39773153
• Kumar V et al. Comparison of Clinical and Functional Outcomes after Platelet-Rich Plasma Injection and Corticosteroid Injection for the Treatment of de Quervain’s Tenosynovitis. Journal of wrist surgery, 2022. PubMed 36926208
• Chong HH et al. Advancements in de Quervain Tenosynovitis Management: A Comprehensive Network Meta-Analysis. The Journal of hand surgery, 2024. PubMed 38613563
• Iqbal MT et al. Efficacy of Intralesional Platelet-Rich Plasma in Patients With de Quervain’s Tenosynovitis. Cureus, 2025. PubMed 40151706