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The Cheapest Splint in Hand Therapy. Also the Most Misused.
Buddy taping (buddy strapping) tapes an injured finger to its neighbor so the healthy finger acts as a moving splint. For a sprained or jammed finger, wear it day and night for about 3 weeks, then for activity and sport until around week 6, and for contact sport for up to 3 months. Tape between the joints, never over them, with a thin pad in the gap.
It HELPS with collateral ligament sprains, jammed fingers and some stable fractures, because both fingers keep bending and the ligament is protected from sideways stress.
It HARMS when it’s used for injuries it can’t hold: rotated fractures, mallet finger, boutonniere injuries and unstable dislocations.
That second list is the problem. Tape looks like treatment, so the finger gets taped and everyone stops looking.
Meanwhile the clock runs. A mallet finger taped to its neighbor for 3 weeks has spent its best weeks without the splint it needed. A rotated fracture taped for 3 weeks starts to set in the wrong position, and that finger crosses its neighbor every time you make a fist.
So before the how… the which.
What is buddy taping and how does it work?
Every finger joint has a strong ligament on each side, the collateral ligaments. They work like the side straps on a hinge: the joint bends and straightens freely, but can’t swing sideways. A ball, a mat or a door that bends the finger sideways is what tears them. Tape the finger to its neighbor and the neighbor blocks that sideways stress, while both fingers keep bending and straightening together.
It’s the buddy system. The healthy finger plays Samwise, carrying half the load so the injured one can keep walking.
That movement is the whole point. A rigid splint on a sprained middle joint protects the ligament and stiffens the joint. Buddy tape protects the ligament and keeps the joint moving.
When is buddy taping the right choice?
- Collateral ligament sprains. The sideways injury, where a rigid splint causes more stiffness than it prevents.
- Jammed fingers. Once a fracture and tendon injury have been ruled out.
- Some stable finger and metacarpal fractures. Without rotation, and only as your doctor or therapist advises.
- Return to sport. After a sprain, for training and matches.
When should you NOT buddy tape a finger?
- A fingertip that droops. Mallet finger needs a splint holding the end joint straight all day and night. Tape lets it bend every time the neighbor bends.
- A middle joint that won’t straighten. A central slip injury (the start of a boutonniere) needs a splint holding the middle joint straight, not a buddy.
- A finger that crosses its neighbor when you make a fist. That’s a rotated fracture, and tape can’t correct rotation.
- A joint that dislocates again easily. PIP fracture-dislocations need an extension block splint or surgery.
- The thumb. It has no buddy that bends the same way. A thumb sprain needs a thumb splint.
- A sprain on the outer edge of the hand. The thumb side of the index finger and the outer side of the little finger have no neighbor on that side to tape to. Those usually need a small custom splint instead.
Buddy strapping supports a finger that’s sprained. It can’t hold one that’s broken out of line or has lost a tendon.
How do you know if it’s just a sprain?
You can’t be sure at home. An X-ray is how fractures are found, including the small chip fractures at the middle joint that change the whole plan. But four quick checks tell you whether tape is even in the running:
- Make a slow fist. The fingertips should point toward roughly the same spot near the base of your thumb, and the nails should line up. A finger that crosses over or under its neighbor is rotated.
- Lift the fingertip on its own. If the end joint droops and won’t lift by itself, even though you can push it straight, think mallet finger.
- Straighten the middle joint on its own. If it can’t, or it’s weak and sore over the back of the joint, treat it as a central slip injury until someone proves otherwise.
- Press along the bones. Sharp pain on one spot of bone, an obvious bend, or a crack you heard at the time means X-ray first, tape later.
In clinic we also stress the ligament sideways and compare it to the same joint on the other hand, and we want an X-ray that includes a true side view of the joint. That’s the view that shows the middle joint sitting properly or not.
How to buddy tape a finger properly
- Tape the segments, not the joints. One strap between the knuckle and the middle joint, one between the middle and end joint. Joints stay free to bend.
- Put a thin pad between the fingers. A strip of gauze or felt stops sweat softening the skin.
- Choose the neighbor on the injured side. A sprain on the side facing the middle finger gets taped to the middle finger, so that finger blocks the stress.
- Snug, not tight. Fingers should stay pink, and you should be able to slide a thin card under the tape.
- Tape or loops. Non-stretch sports tape works. Ready-made Velcro buddy loops are easier to change and kinder to skin you’ll be taping for weeks.
- Change it daily, and whenever it gets wet.
(The little finger is shorter than the ring finger, so its straps won’t sit level. Fine. What matters is that neither strap crosses a joint crease.)
How long should you buddy tape a jammed or sprained finger?
- Weeks 0 to 3: day and night for a sprain, with regular gentle bending and straightening.
- Weeks 3 to 6: for activity and sport only.
- Up to 3 months: for contact sport, while the ligament is still maturing. A PIP joint can stay thickened for months, and that alone doesn’t mean it’s still injured.
- Stable fractures: your doctor sets the tape time, often around 3 to 4 weeks. Bone takes 6 to 12 weeks to fully heal, so heavy grip and contact wait longer than the tape does.
The middle joint runs on a clock, and this is where the Closing Window Method earns its name. In weeks 0 to 3 the window is OPEN: movement inside the tape stops the joint stiffening. By weeks 4 to 6 it’s CLOSING: a joint that still won’t fully straighten needs targeted work, not more tape. Past about 3 months a stiff middle joint is much harder to change. Not impossible. Slower, and usually with a splint.
Should you wear buddy tape at night?
Yes, for the first 3 weeks of a sprain. Sleep is when fingers get rolled on, tucked under pillows and caught in sheets, and you aren’t awake to stop it. After week 3, most people can sleep without it unless the finger gets knocked at night.
What exercises should you do while buddy taped?
For a sprain, start in the first days. For a fracture, only once your doctor or therapist says the bone allows it.
- Full fist, full straighten. In the tape, slowly. 10 reps, 4 to 6 times a day.
- Middle joint bends. Hold the injured finger just below the middle joint with your other hand and bend only the middle joint. 10 reps, 3 to 4 times a day.
- Flat on the table. Palm down, press the whole finger flat for 10 seconds. 10 reps, 3 times a day. This is the one people skip, and the bent middle joint is the result.
- Swelling control. Hand above your heart when it throbs, and a light self-adhesive wrap on the finger at night if your therapist shows you how.
Sore while you do it is fine. Sharp pain, or worse an hour later, means you did too much. Drop the reps, don’t stop moving.
How do you look after the skin under buddy tape?
- Off once a day. Wash between the fingers, then DRY them properly. A hair dryer on cool works.
- Fresh pad, fresh tape. Wet tape gets changed, not left to dry on.
- Move the healthy finger on its own. A few full fists once a day with the tape off, so it doesn’t stiffen out of sympathy.
- No tape on broken skin. Cover any graze with a dressing first.
Watch for these:
- White, soft skin between the fingers.
- The healthy finger stiffening from being taped for weeks.
- Tape rolling into a tight band at the joint.
- Swelling spilling above and below the tape.
Can you work, drive and play sport with buddy tape?
- Desk work and typing: usually straight away.
- Driving: once you can grip the wheel firmly and control the car in an emergency. Tape alone doesn’t stop you. Pain might.
- Manual work: often possible in tape and gloves for a sprain. Heavy tool grip waits until gripping doesn’t hurt, in my experience usually 2 to 4 weeks.
- Ball sports, grappling, climbing: taped for every training and match for up to 3 months. Back to play when you can make a full fist and catch without pain.
How do you wean off buddy tape?
- Around week 3: off at home for light tasks, an hour at a time, then half days.
- Weeks 4 to 6: only for sport, crowds, heavy work and anything where the finger could get caught.
- The rule: if pain or swelling is clearly up the next morning, go back one step for a few days.
What a hand therapist does differently
We check whether the ligament is stable, pick the right neighbor, and decide whether tape is enough or the finger needs a custom splint instead. Then we measure the middle joint every visit, cos a joint losing a few degrees of straightening each week is easy to miss at home and easy to fix early. See which finger splint for which injury, and what a hand therapist does for the full list of supports.
Get it checked today if
- The fingertip turns pale, blue, cold or numb, and loosening the tape doesn’t fix it.
- The joint looks out of shape, or popped out and stays out.
- A finger crosses another when you make a fist.
- A fingertip or middle joint won’t straighten on its own.
- There’s a cut over the joint.
Get it checked if
- The joint wobbles sideways or keeps giving way.
- Pain is getting worse after the first week, not better.
- You can’t make a full fist or fully straighten the finger by week 3.
- Gripping still hurts at week 6.
Tape the segments, pad the gap, and rule out the injuries tape can’t hold.
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 jammed finger that still won’t straighten at week 3 deserves a proper look, not more tape.
Part of: Hand, wrist and elbow splints: which one, why and how long