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A Broken Hand Bone, Held in Line. Fingers Free to Work.
A metacarpal fracture brace is a small, hand-based brace that wraps around the palm and the back of the hand and holds a broken hand bone in line, while the FINGERS AND WRIST KEEP MOVING. It suits stable metacarpal shaft fractures and boxer’s fractures that aren’t rotated. Most people wear it full-time, day and night, for about 3 to 4 weeks, then for activity to around week 6. Heavy gripping returns at 8 to 12 weeks.
Because the fingers move from the start, the stiffness that often follows a hand cast is less of a problem.
You’ve broken a bone in your hand, and instead of a big cast someone has offered you a little brace with two straps. Sounds almost too easy.
It works. On the right fracture. Two things make it go wrong. A brace on a fracture that’s TWISTED lets it heal twisted, and a twisted metacarpal sets in about 2 to 3 weeks… after that the fix is re-breaking the bone. Or the brace goes loose as the swelling drops, nobody tightens it, and it becomes a fairly expensive bracelet.
Here’s how to make sure yours is neither.
What is a metacarpal fracture brace and how does it hold the bone?
The metacarpals are the five long bones in your palm, running from the wrist to the knuckles. The middle stretch is the shaft. The narrow part just behind the knuckle is the neck, which is where a boxer’s fracture happens.
- Three-point pressure. Firm pads over the back of the hand and in the palm, either side of the fracture, keep the bone from bowing.
- The soft tissue does part of the work. Compressed muscle and skin around the bone act like a natural splint.
- The knuckles stay free, so the tendons glide over the healing bone and don’t stick to it.
- Using the fingers helps, because muscle contraction inside a snug brace adds to the support.
A bone can heal in a brace while the fingers work. It’s the fingers that stiffen in a cast.
Which metacarpal fractures can be treated in a brace?
- Stable metacarpal shaft fractures without shortening or rotation.
- Many boxer’s fractures of the little finger metacarpal neck, within the angle your surgeon accepts.
- People who need to keep working or looking after family, where a bulky splint would stop them.
When is a brace not enough?
- Rotated fractures. If the finger crosses its neighbor when you make a fist, a brace won’t fix it. Scissoring is fine for Edward Scissorhands. Not for you.
- Shortened bones, where the knuckle has dropped back and the finger has lost length.
- Several metacarpals broken at once, or fractures into the knuckle joint.
- Open wounds or severe swelling in the first days. An ulnar gutter splint often comes first.
Those go to a hand surgeon, usually for pins, a plate or screws.
How is it decided: the X-ray and the fist check
- X-rays from three angles. Front, side and oblique. The side view measures the angle of the break.
- The fist check. Curl all four fingers slowly into a loose fist. The fingertips should all point towards the base of the thumb, and the nails should line up. X-rays show rotation poorly, so this check matters more than people think.
- A skin check over every knuckle. Any cut over a knuckle after punching a person is a possible tooth wound and changes the plan completely.
- A repeat X-ray at around 7 to 10 days, in the brace, to make sure the bone hasn’t slipped.
How long do you wear a metacarpal fracture brace?
These are typical ranges for a fracture treated without surgery. Your surgeon may give you different dates. Use theirs.
- Days 0 to 7: gutter splint or bandage while swelling settles, hand above heart level as much as you can for the first 3 days. The brace is fitted once the swelling allows, often within the first week.
- Weeks 1 to 4: brace worn full-time, day and night. Full finger movement and light use from the start: eating, typing, washing. No heavy gripping, and no pushing up from a chair through that hand.
- Weeks 4 to 6: brace for activity, travel and crowds once the bone is no longer tender and the X-ray looks right. Off at home for light tasks and exercises.
- Weeks 6 to 8: brace off for daily life. Grip strengthening starts.
- Weeks 8 to 12: heavier work and sport building up. Bone usually needs 6 to 12 weeks before it’s ready for full load, and grip strength often keeps improving for 3 to 6 months.
The window here is about rotation and angle. In the first week it’s OPEN: a twisted or badly angled bone can still be lined up simply. Around days 7 to 14 it’s CLOSING as the bone gets sticky. Past about 3 weeks it’s SHUT for simple fixes, and correcting a twist means an operation to re-break the bone. A straight, untwisted fracture doesn’t care much about this clock. A rotated one cares a lot.
How should a metacarpal brace fit?
- Snug, not strangling. It shouldn’t slide when you shake your hand. You should be able to slip one finger under a strap, not two.
- Knuckles free. The edge stops just behind the knuckles so you can make a full fist. The palm edge stops before the palm crease.
- Wrist free. If it blocks the wrist, it’s a different splint.
- Tighten the straps daily as swelling drops. A loose brace does nothing.
- Firm pressure over the fracture is the point. Pain at the edges of the brace isn’t.
- Red marks should fade within 20 to 30 minutes of taking it off.
- Tingling, or white or dusky fingers, means too tight. Loosen it now.
Skin care under a fracture brace
- Keep the skin dry under the pads, and check it twice a day.
- A thin cotton liner soaks up sweat. Change it daily.
- Only take it off if you’ve been told you can. Do it with the hand resting flat on a table, don’t grip or bend the knuckles hard while it’s off, and put it straight back on.
- Clean the brace with cool water and mild soap. Keep it away from heaters and hot cars, which can soften the plastic.
What exercises do you do in a metacarpal fracture brace?
Start only when your surgeon or therapist says the fingers can move. Gentle, within comfort, no forcing.
- Full fist and full straighten. Inside the brace. 10 slow reps, every hour while you’re awake.
- Check your fist every day for the first two weeks. Fingers should point towards the base of the thumb, not cross.
- Tendon glides. Straight fingers, hook fist, full fist, tabletop, straight fist. Hold each 3 seconds, 10 rounds, 4 to 5 times a day. See stiff hand after a cast or splint for why these matter.
- Knuckle bends. Bend only at the big knuckles, fingers straight like a table top. 10 reps, 4 times a day. This is the motion that goes missing first.
- Keep the hand raised in the first week to control swelling, and pump the fingers while it’s up.
- Grip work, from about week 6 and with clearance: soft putty squeezes, 2 to 3 minutes, twice a day.
A sore, tired hand after exercise that settles within an hour is fine. Pain that lingers into the next day means back off a level.
How do you wean off the brace?
- On your surgeon’s say-so, usually once the bone isn’t tender to press and the X-ray shows healing.
- Light home tasks first. Keep it on for commuting, crowds, sport and heavy jobs for a while longer, often until about week 6.
- Over 1 to 2 weeks, not overnight.
- The test: a full fist, no new pain over the bone, and no finger starting to drift.
When can I work, drive and go back to sport?
- Desk work: often within days, typing with the fingers moving freely in the brace. See returning to work after a hand injury.
- Light manual work: around 6 weeks.
- Heavy manual work: 8 to 12 weeks.
- Driving: once you can grip the wheel firmly and could control the car in an emergency. Check with your surgeon and your insurer. See driving after a hand injury.
- Gym: lower body and cardio straight away. Pressing and pulling with that hand from about 8 weeks, starting light.
- Contact sport: sometimes earlier in a protective splint, only with your surgeon’s say-so. See playing splints and casts.
- Punching, bag work, sparring: usually not before 12 weeks.
What a hand therapist does differently
Fits the brace once the swelling allows, checks the fist at every visit, tightens or remolds the brace as the hand slims down, and keeps the tendons gliding over the healing bone. The bone usually heals. The job is making sure the hand that comes out of the brace still makes a full fist.
Get it checked today if
- There’s ANY cut or puncture over a knuckle after punching a person. Go to the ER.
- The fingers are numb, pale or cold, or pain keeps climbing inside the brace and loosening it doesn’t help.
- A finger starts to cross its neighbor when you make a fist.
Get it checked if
- A new bump or step appears on the back of the hand.
- Pain is increasing after the first week.
- Color change or skin breakdown under the pads.
- You can’t make a full fist by week 6 to 8.
- The straps are at their tightest and the brace still slides.
This is one of dozens of splints a hand therapist makes. See what a hand therapist does for the full list.
Hold the bone, free the fingers, and check the fist every day.
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 finger that starts crossing its neighbor in a brace deserves a review today, not at the next X-ray.
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.