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A Splint Only Works If It Fits. Here’s How to Keep It That Way
Clean a hand or wrist splint with lukewarm water and mild soap, rinse, and let it air dry, never with hot water and never near heat, because a molded plastic splint can soften and warp. Wash the straps by hand. Check the skin underneath every day: redness that doesn’t fade within about 20 minutes of taking the splint off, a sore spot, numbness or tingling all mean the fit is wrong. And only take it off if you’ve been told you can. For some injuries, even one minute out of the splint undoes weeks of healing.
The splint is half the treatment
Somebody spent time getting that splint exactly right. The angle of the joint. Which joints stay free. Where the straps sit.
Then it goes home…and real life happens. It gets left on the car dashboard. Washed in hot water. Strapped on a bit tighter cos it feels “more supportive”. Worn over a hand that’s swelling up.
And suddenly the splint that was helping is rubbing a sore, squeezing a nerve, or holding the joint at the wrong angle.
A splint that doesn’t fit isn’t a weaker version of treatment. It can be a new problem.
First: are you allowed to take it off?
Check before you do anything below. Some splints must stay on day and night until your therapist or surgeon says otherwise:
- Mallet finger: the fingertip must stay straight the whole time, even while you clean the splint. Mallet finger splinting
- After flexor tendon repair: the dorsal blocking splint protects the repair. It comes off only how and when your hand therapist shows you
- After extensor tendon repair: often the same rule. Relative motion splints
If you’re not sure, assume it stays on and ask.
How to clean a splint
- Lukewarm water and mild soap. Wipe or rinse the plastic, inside and out
- Rinse and towel off, then let it air dry away from direct heat
- Straps and padding: hand wash in cool soapy water, squeeze out, air dry. Velcro that’s lost its grip can usually be replaced
- Smells: an alcohol wipe on the hard plastic helps. A thin cotton sleeve or stocking under the splint helps more, and it’s easy to wash daily
And the rule people break most often: molded splint plastic is shaped with heat, so heat can reshape it. No hot water. No dishwasher. No hair dryer. No car dashboard in the sun. No leaving it next to the stove.
The Wicked Witch of the West melted in water. Your splint is the opposite…water’s fine, it’s heat that ruins it.
Look after the skin underneath
- If you’re allowed to remove it, wash and fully dry the skin once a day. Damp skin under plastic breaks down fast
- Check the bony points: the wrist bones, knuckles, the side of the thumb. That’s where pressure sores start
- Skip thick creams under the splint. They soften the skin and trap moisture
(The 20-minute rule: take the splint off and look at any red mark. Faded within about 20 minutes, that’s normal pressure. Still red after that, or a spot that’s white, blistered or broken, the splint needs adjusting. Don’t just pad it and carry on.)
Common fit problems and what to do
- It rubs in one spot: that spot needs relieving. Your hand therapist can heat and reshape that part in minutes. Don’t cut or heat a custom splint yourself
- It feels tighter than it did: usually the hand has swollen. Loosen the straps a notch, raise the hand, and if it doesn’t settle, get it checked. Managing swelling
- It feels looser and slides around: the swelling has gone down. Good news, but a sliding splint holds the wrong angle. It may need remolding
- Straps dig in: snug, not tight. You should be able to slide a finger under each strap
- It’s cracked or warped: stop using it until it’s checked. A warped splint holds the joint wrong
Tighter is not more supportive. Tighter is just tighter.
Showering and sleeping in a splint
Showering: if it must stay on, cover it with a plastic bag or a waterproof cast cover, and keep the hand out of the spray. If it gets wet, dry the skin and the inside of the splint properly afterwards. Wounds and fresh stitches stay dry until you’re told otherwise.
Sleeping: raise the hand on a pillow, especially in the early weeks. Many night splints, like the carpal tunnel night splint or the Capener, do most of their work while you sleep. More in sleeping after hand surgery.
Call your hand therapist or doctor today if
- Fingers go numb, tingly, white, blue or cold in the splint
- Throbbing pain or swelling that doesn’t settle after loosening the straps and raising the hand
- A blister, broken skin, or a sore that’s leaking
- A smell or discharge from under the splint, especially over a wound or pin sites
- The splint broke, warped, or you took it off when you weren’t meant to
Not sure what’s normal after surgery in general? What’s normal after hand surgery, week by week.
The short version
Cool water, mild soap, air dry, no heat, ever. Check the skin daily and use the 20-minute rule. Snug, not tight. Rubbing, slipping or warping means adjust it, not tolerate it. And if it’s a splint that has to stay on, it stays on.
Want to know which splint is meant to do what? Finger splints, wrist splints and thumb spica splints. And for what a hand therapist actually does with them, here’s the full picture.
Written by Nigel Chua, hand occupational therapist in practice since 2005. Thousands of hands, wrists and elbows assessed and treated. My credentials are here. Every article on this site is written using the Closing Window Method: name the window your condition runs on, find where you are in it, and act while it’s still open. Your own therapist’s instructions for your splint come first.