Is your recovery window still open? Free one-page chart ↓
Six Weeks in a Splint Built to Stop You Doing One Thing.
A dorsal blocking splint is worn FULL-TIME, day and night, for about 6 weeks after a flexor tendon repair. It’s weaned off over weeks 6 to 8, and heavy gripping waits until around 12 weeks.
It sits along the BACK of the forearm and hand. The usual position: wrist straight or bent slightly forward, knuckles bent around 50 to 70 degrees, and the finger joints straight against the splint.
You don’t take it off unless your therapist has taught you how. Not to shower. Not to sleep. Not to “just check”.
If you’re reading this, you probably have a fresh repair, a bulky splint and a list of questions nobody answered before you left the hospital. Can I shower in it? Why are my fingers bent like that? Am I even allowed to move them?
Here’s what’s at stake, plainly. Stretch the repair in the first 6 weeks and it can pull apart…and that usually means going back to the operating room. Move too little and the tendon glues itself to the scar around it, so the finger won’t bend even though the repair held.
The splint and the exercises exist to keep you between those two.
What a dorsal blocking splint actually does
Your flexor tendons run along the palm side of the hand, from the forearm muscles to the finger bones. They’re the cables that bend your fingers. Once one is cut and repaired, the movement that threatens it most is the wrist and fingers straightening TOGETHER, cos that pulls the two repaired ends apart. More on the anatomy in flexor tendon injuries and the finger zones.
- Blocks the stretch. The splint is on the back of the hand, so you can bend your fingers but you can’t straighten the wrist and fingers together.
- Allows planned movement. A repaired tendon that doesn’t glide gets stuck in scar. A tendon that’s pulled too hard ruptures. The exercises sit between those two.
- Protects against the reflex grab. When you trip or catch something falling, the hand grips hard without asking. The splint limits the damage.
What angles is a dorsal blocking splint set at?
Every protocol differs a little. Your therapist sets yours to your surgeon’s instructions, and those numbers win over anything here. The typical setup:
- Wrist: straight to slightly bent forward. Commonly anywhere from neutral to about 20 to 30 degrees of flexion. Some newer early-movement programs hold the wrist at neutral or just past it.
- Knuckles (MCP joints): bent around 50 to 70 degrees. This puts slack in the tendon, so finger movement doesn’t pull on the repair.
- Finger joints (PIP and DIP): straight. They rest flat against the splint, usually held with a strap at rest. This stops the middle joint stiffening into a bend, which is one of the hardest stiffnesses in the hand to undo.
- Length: from about two-thirds of the way up the forearm to past the fingertips. The thumb stays free unless the thumb’s own flexor tendon was repaired.
If the splint has been made for you in a hand therapy clinic, it’s molded to your arm. Don’t bend it, trim it or heat it. (A hot car dashboard will soften thermoplastic faster than you’d think.)
What it’s used for
- Flexor tendon repairs in the fingers and palm, usually after a cut from glass, a knife or a tool.
- Jersey finger repairs, where the tendon was pulled off the fingertip bone.
- Some nerve and artery repairs in the finger, where the same stretch would strain the repair.
The versions you might see
- Full forearm-based splint, wrist held slightly bent or near neutral depending on the protocol. Still the most common.
- Short hand-based splint, used in some early active programs, leaving the wrist free to move in a controlled way.
- Older elastic band designs, which pulled the fingers down passively. Many clinics now use early active movement programs instead.
How long do you wear a dorsal blocking splint?
Think of the first 12 weeks as a window. In weeks 0 to 6 it’s wide OPEN: what you do every day shapes how freely that tendon will slide for the rest of your life. From weeks 6 to 12 it’s closing, as scar matures. Your surgeon’s dates come first. A conservative timeline:
- Weeks 0 to 3 (open): splint on 24 hours a day. Exercises exactly as taught, many times a day. The repair is at its weakest in these weeks, as the tendon ends soften before they knit. Hand above your heart as much as possible.
- Weeks 3 to 6 (open): splint still on full time. Exercises progress, often to more active bending. Still no using the hand.
- Weeks 6 to 8 (closing): weaning. The splint comes off for exercises and light tasks during the day, and often stays on at night and in crowds. Light use only: eating, writing, buttons. No gripping or lifting.
- Weeks 8 to 12 (closing): splint off. Gentle strengthening starts when your therapist says so, usually soft putty and light grip first.
- Week 12 onwards: heavy grip, lifting and contact sport, built up gradually. Strength keeps improving for months after this.
If the finger still won’t bend well at 3 months despite good work, the question changes. Your surgeon may discuss a tendon release (tenolysis), which is usually not considered until at least 3 to 6 months after the repair, once the scar has settled and progress has stalled.
The repair is strong enough for the exercises you’re given, and not much more.
Can I take my splint off after flexor tendon repair?
In the first 6 weeks: no, unless your therapist has specifically taught you a removal routine.
The reason is one movement. Reaching for a falling cup, stretching as you wake up, pushing yourself off the bed…the wrist and fingers straighten together in half a second. That’s the exact stretch the splint exists to block.
If your protocol does allow brief removal for skin care:
- Sit at a table with your forearm resting on it and the wrist and fingers kept bent.
- Never straighten the wrist while the splint is off. Not even a little.
- Wash, dry, check the skin, strap it straight back on. Minutes, not a break.
(Yes, “just to see if it moves” counts as taking it off.)
How do I shower with a dorsal blocking splint?
- Cover it. A waterproof cast cover, or a plastic bag sealed at the forearm with tape. Hold the arm out of the spray anyway.
- Keep the wound dry until the stitches are out, usually around day 10 to 14, and your surgeon is happy with it. A sponge wash is fine before then.
- A wet liner is a problem. Damp padding against skin for hours softens it and it breaks down. Tell your therapist the same day.
- Don’t push anything down inside the splint to scratch. Pens and chopsticks make wounds.
How do I sleep in a dorsal blocking splint?
- Splint on. Night is when the unplanned stretches happen.
- Hand on a pillow above heart level for the first week or two, to keep swelling down.
- Sleep on your other side so you don’t roll onto it.
- A pillowcase or old sock over the splint stops the Velcro grabbing your sheets like it’s auditioning for Spider-Man.
More on positioning in sleeping after hand surgery.
What exercises can I do in a dorsal blocking splint?
This depends entirely on your surgeon’s repair and protocol. Do your sheet, not this list. The common building blocks:
- Passive bending. Your other hand gently pushes the finger down towards the palm, then lets it go back to the splint. The tendon slides without working.
- Place and hold. Your other hand places the finger in a partial fist, then you hold it there with the lightest possible effort.
- Early active bending. You bend the finger yourself, often only partway (a third to half a fist early on), with light effort.
- Straightening to the splint. Finger joints straightened fully against the splint, so the middle joint doesn’t stiffen bent.
- Dose. A common pattern is sets of 10, every 1 to 2 hours while you’re awake. Skipping sessions is how the tendon gets stuck.
What you DON’T do: make a hard fist, squeeze anything, use the hand for tasks, push the wrist back, or test the finger harder than your sheet says.
The rules that protect the repair
- Don’t take it off, even to wash, unless your therapist has taught you how.
- Don’t use the hand to grip, carry, push up from a chair or hold a phone.
- Don’t test the finger beyond your exercise sheet. No hard fists “just to see”.
- Do every exercise session. Skipping them is how the tendon gets stuck.
- Bring the splint to every therapy visit. As swelling drops it gets loose, and a loose splint stops blocking.
The two classic moments for a rupture: the early weeks, and the week the splint comes off and the hand suddenly feels “normal”. Confidence arrives before tendon strength does.
When can I work, drive and use my hand normally?
- Desk work: one-handed, often within 1 to 2 weeks if the commute and the job allow it. See life with one hand after surgery.
- Driving: not while you’re in the splint. Most people need the splint off and enough grip to control the car in an emergency, rarely before 8 weeks. Check with your surgeon and your insurer.
- Light manual work: around 8 to 10 weeks.
- Heavy manual work, lifting, climbing, contact sport: around 12 weeks, built up gradually. See returning to work after a hand injury.
What a hand therapist does that the splint can’t
- Molds the splint to your angles and refits it as the swelling comes down.
- Measures the gap between how far the finger bends when you push it and how far it bends on its own. A widening gap is an early sign the tendon is sticking, and the program changes that week.
- Manages the scar once the wound has healed. See scar management after hand surgery.
- Decides when each rule loosens, based on how your tendon is behaving, not the calendar alone.
This is one of dozens of splints a hand therapist makes. See what a hand therapist does for the full list.
Call your surgeon today if
- A pop or snap, then a finger that no longer bends the way it did yesterday. A ruptured repair is easier to fix early.
- Spreading redness, warmth, discharge from the wound, or a fever.
- Numbness that’s new, or a finger that turns pale, blue or cold.
- The splint is broken, cracked or no longer holds the knuckles bent.
- Pain that’s getting worse rather than better after the first few days.
Get it checked if
- The finger bends less this week than it did last week.
- The middle joint won’t straighten fully against the splint. See can’t straighten a finger after hand surgery.
- A red, sore pressure spot under the splint, or a strap that rubs.
- The liner got wet, or the splint now slides around on your arm.
Splint on, exercises done, and no gripping until your therapist says so.
Written by Nigel Chua, hand occupational therapist in practice since 2005. Thousands of hands, wrists and elbows assessed and treated. My credentials are here. This article explains; it doesn’t examine. Your surgeon’s protocol and your therapist’s instructions come first after a tendon repair.
Part of: Hand, wrist and elbow splints: which one, why and how long
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.