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The Smallest Splint After Tendon Surgery Is Doing the Biggest Job.
A relative motion splint, often called a YOKE, is a small band across the knuckles that holds one finger slightly higher or lower than its neighbors, so a repaired or torn tendon is protected while every finger keeps moving. After an extensor tendon repair it’s typically worn full time, day and night, for about 6 weeks, weaned over weeks 6 to 8, with heavy grip from around 10 to 12 weeks.
That small offset takes tension off the tendon, while every finger keeps bending and straightening.
It’s used for extensor tendon repairs over the back of the hand, sagittal band ruptures, and in some boutonniere and flexor tendon programs.
Most people can use the hand for light tasks while wearing it.
And that’s the trap. It’s so small and so comfortable that it stops feeling like protection. It comes off for a shower and stays on the sink. It comes off “just for this one job”.
A tendon repair a few weeks old is still weak. Load it without the yoke and it can stretch or pull apart, and a stretched extensor repair shows up as a knuckle that never quite lifts as high as its neighbors again. Go the other way, keep the fingers still out of fear, and the tendon glues itself to the scar.
The yoke exists so you don’t have to choose between those two.
How does a relative motion splint work?
The tendons that straighten your fingers start from one shared muscle in the forearm and are tied to each other by small bands across the back of the hand. Pull one finger down and its neighbors feel it. See hand tendon anatomy for the full picture.
- Your fingers share muscles. The long finger tendons in the forearm are linked, so the position of one knuckle changes the tension on its neighbors’ tendons.
- Extension version. The injured finger’s knuckle sits slightly MORE STRAIGHT than the others. Tension on its extensor tendon drops, so the repair or torn band is protected while you move.
- Flexion version. The injured finger’s knuckle sits slightly MORE BENT than the others, which changes the load through the tendons over the middle joint.
- The offset is small. Usually around 15 to 20 degrees. Enough to protect, not enough to stop function.
Protection doesn’t have to mean stillness. It can mean moving with the tension switched down.
What is a yoke splint used for?
- Extensor tendon repairs over the knuckles and back of the hand. Often paired with a wrist splint for the first few weeks, then worn alone. Some surgeons use the yoke alone from day one.
- Sagittal band rupture. Where the tendon slips off the knuckle. The extension version keeps the tendon centered while the band heals.
- Some boutonniere and central slip injuries. Using the flexion version alongside a middle joint splint.
- Some flexor tendon programs. Depending on the surgeon and the zone.
How long do you wear a yoke splint after extensor tendon repair?
Your surgeon and therapist set the exact dates for your repair. Use theirs. This is the conservative shape most programs follow:
- Weeks 0 to 3: yoke plus a wrist splint, worn full time, day and night. Full, easy finger movement inside both.
- Weeks 3 to 6: wrist splint off for light use (some surgeons keep it for nights or crowds). Yoke stays on full time.
- Weeks 6 to 8: yoke weaned for light tasks at home, kept on for heavier or riskier ones, and often for sleep.
- Weeks 8 to 12: strengthening, with heavy grip from around 10 to 12 weeks.
For a sagittal band rupture treated without surgery, the yoke is usually worn full time for around 6 weeks, then weaned over the next couple of weeks.
Here’s the window this recovery runs on. Weeks 0 to 6 are OPEN: the repair is protected and the tendon has to glide, cos this is when the scar decides whether to let it. Weeks 6 to 12 are CLOSING: a knuckle that lags or a fist that won’t close still responds well to targeted work. Past about 3 months, what’s left is much harder to change with exercise alone, and occasionally a second operation to free the tendon gets discussed. See can’t straighten a finger after hand surgery.
Do you wear it at night, and can you take it off to shower?
- Nights: yes, for the full-time phase. You can’t protect a repair you’re asleep on.
- Showers: it depends on your program. Some keep the yoke on in the shower and dry it afterward, some use a spare, some allow it off with the hand held flat. Ask which yours is, and don’t improvise.
- If it’s off for any reason: no fist, no gripping, no pushing up from a chair with that hand until it’s back on.
What exercises can you do in a yoke splint?
These follow your therapist’s program. This is the typical pattern, not a substitute for it.
- Weeks 0 to 6, inside the yoke: slow full fist, then full straighten. 10 reps, every 1 to 2 waking hours. This is the movement that keeps the tendon gliding.
- Not yet: pushing the finger down into a fist with your other hand, squeezing anything, or lifting with the hand. That’s load the repair isn’t ready for.
- Weeks 6 to 8: tendon glides out of the splint (straight hand, hook fist, full fist, flat fist). 10 reps each, 3 to 4 times a day. Gentle stretch into a full fist only when your therapist says so.
- From around week 8: light putty, then progressive grip work toward heavy grip at 10 to 12 weeks.
Why people like it
- It’s small enough to type, write and eat with.
- Fingers keep moving, so stiffness after the repair is less of a battle.
- It’s easy to keep on, which matters, because a repair splint that comes off too early is a common cause of a rupture.
Can you work, drive and go to the gym in a yoke?
- Desk work, typing, writing: often from 1 to 2 weeks after surgery, in the splint, as comfort and your surgeon allow.
- Driving: not in a wrist splint. Most people wait until the yoke is weaned, around 6 to 8 weeks, and can grip the wheel firmly enough to control the car in an emergency. See driving after a hand injury.
- Light manual work: around 6 to 8 weeks. Heavy manual work: around 10 to 12 weeks. See returning to work after a hand injury.
- Gym: light work from about 8 weeks. Heavy grip, push-ups and pull-ups from about 10 to 12 weeks. Contact sport from around 12 weeks.
Problems to watch for
- Pressure marks on the sides of the fingers where the band sits. They should fade within about 30 minutes.
- Swelling that makes it tight by evening. Hand up, fingers moving, and tell your therapist so it can be adjusted.
- A knuckle that starts to lag or can’t lift as high as its neighbors.
- Heavy gripping while wearing it. Small splint, same repair. It doesn’t make heavy lifting safe.
- Heat. Most yokes are molded plastic. Hot water and a car dashboard in the sun can change their shape.
What a hand therapist does with a yoke
We mold it to your hand, set the offset for your injury, and reshape it as the swelling drops. Then we measure how far each knuckle lifts every visit. A lag of a few degrees caught at week 4 is a small adjustment. The same lag found at week 10 is a much bigger conversation. See what a hand therapist does for the full list of splints.
Call your surgeon today if
- A sudden pop, then a finger that droops at the knuckle.
- The tendon visibly slipping sideways over the knuckle again.
- Increasing redness, warmth, throbbing, discharge from the wound, or a fever.
- A finger that’s numb, pale or blue.
- The yoke has broken or been lost in the first 6 weeks. Get it replaced today, not at your next appointment.
Get it checked if
- The knuckle lag is getting bigger from one week to the next.
- You can’t make a full fist by weeks 6 to 8.
- Marks that don’t fade, or the yoke is tight every evening.
A small offset at the knuckle protects the tendon and keeps the hand moving.
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. A knuckle that’s lagging more each week after a tendon repair deserves a review this week.
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.