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A Muscle Pulls This Break Apart. That’s Why Most of Them CAN’T Just Be Cast.
A Bennett’s or Rolando fracture is a break at the base of the thumb that runs into the joint. The bone needs 6 to 12 weeks to heal, with at least 6 to 8 weeks of protection in a cast or thumb spica splint.
Most need surgery, usually wires or a screw. Useful pinch comes back around 3 to 6 months. Full pinch strength can keep improving for up to a year.
A break at the very base of the thumb, where the thumb’s long bone meets the wrist, is a different problem from a break anywhere else in the thumb.
Two reasons.
- It runs into the joint surface.
- And there’s a muscle attached just above it, constantly pulling the broken piece away.
That combination means most of these need fixing surgically, and the ones that get treated in a cast alone frequently slip.
It matters because that joint is the one you use for every pinch, key turn and jar lid, and a joint surface left uneven becomes thumb base arthritis earlier than it otherwise would.
And this one runs on a short clock. The window for putting that joint surface back is the first week or two. After about 3 weeks the pieces start sticking where they lie, and a slipped fragment that has started to heal is far harder to correct.
Two names, one location
A Bennett’s fracture is the two-piece version.
- The small piece stays put. A triangular fragment stays behind at the base, anchored by a strong ligament that doesn’t let go.
- The rest of the thumb bone gets pulled away. One muscle (abductor pollicis longus) hauls the shaft up and back. Another (adductor pollicis) pulls the thumb in towards the palm.
- Neither stops pulling because you’ve broken something, so the gap tends to open rather than close.
A Rolando fracture is the shattered version, broken into three or more pieces in a Y or T pattern. Same location, harder to rebuild, and generally a worse outcome even in good hands. (Rolando, not Ronaldo. Your phone’s autocorrect will fight you on this one.)
Both usually come from a punch, a fall onto a thumb, or a sporting impact driving the thumb backwards.
Bennett’s vs Rolando fracture: the difference
- Pieces: Bennett’s is two pieces. Rolando is three or more, in a Y or T shape.
- Joint surface: both break into the joint at the base of the thumb. Rolando breaks it into more fragments.
- Treatment: both usually need fixing. Bennett’s is commonly pinned or screwed. Rolando more often needs a plate, and sometimes an external frame when it’s badly shattered.
- Outlook: Bennett’s generally does better. Rolando carries a higher chance of stiffness and later arthritis.
If you’ve been told “Rolando”, expect a longer road…and expect your surgeon to care a LOT about getting that joint surface smooth.
How do you know it’s a broken thumb base?
- Pain and swelling right at the base of the thumb, in the fleshy web where it meets the wrist, rather than up the thumb itself.
- Bruising across the base and into the palm.
- Pinching anything is impossible or agonizing.
- The thumb may look shortened or sit in an odd position.
If you injured your thumb and the pain is at the very base, say so specifically. This is one where the location of the tenderness is the difference between a straightforward thumb fracture and a joint injury. Not sure where yours sits? See thumb pain by location.
Definitely need to separate it from a skier’s thumb, which hurts on the inner side of the joint one level up, at the knuckle rather than the base.
Diagnosis is by X-ray, including a dedicated view of the thumb base, since standard hand views can make the fragment hard to judge. A Rolando pattern often gets a CT scan as well, so the surgeon can see every piece before planning the repair.
Does a Bennett’s fracture need surgery?
Usually, yes. The deciding number is the step in the joint surface. Once the pieces sit more than about 1 to 2 mm apart, most surgeons fix it.
Genuinely undisplaced fractures can be treated in a thumb spica cast, with repeat X-rays at about one week and two weeks specifically to catch it if it drifts. That follow-up is not optional. If you’re being treated in a cast and no repeat X-ray has been booked, ask for one, because these slip quietly in the first two weeks.
Most are treated surgically:
- Closed reduction and pinning. The bone is manipulated into position without opening the skin, then held with wires passed through the skin into the bone. Wires usually stay for around 6 weeks, sometimes longer, and come out in clinic. See K-wires: pin care and removal.
- Open reduction with a screw or plate. The joint surface is rebuilt directly under vision, usually when the fragment is large enough to take a screw, or when the joint surface needs precision.
- External fixation or bridging for badly shattered Rolando patterns.
The aim isn’t a healed bone. Bone will heal almost regardless. The aim is a smooth joint surface, because that’s what decides how the thumb feels in fifteen years.
Thumb spica after a Bennett’s fracture: what you wear and for how long
- What it covers: forearm-based, holding the wrist, the thumb base and the thumb’s big knuckle. The tip joint is often left free.
- Weeks 0 to 6 at minimum, often 8: full time, including sleep. A cast first, then often a molded thermoplastic splint.
- After that: off for exercises, on between sessions and for anything risky (crowds, heavy tasks, sleep) until around 10 to 12 weeks, or whenever your surgeon clears it.
- Screw fixation sometimes lets your surgeon start gentle movement out of the splint earlier. That’s their call, not yours.
More on the splint itself: thumb spica splints: which type and how long.
Bennett’s fracture recovery time week by week
Your surgeon may give you different dates. Use theirs. Rolando patterns usually sit at the slower end of every range here.
Weeks 0 to 2: protect, elevate, watch for slipping
- Thumb out of action, in a cast or post-op splint.
- Fingers, elbow and shoulder moving fully from day one. Full fist and full straighten several times an hour while awake.
- Hand above your heart for the first week.
- Repeat X-rays if you’re in a cast without surgery.
Weeks 2 to 6: the long middle
- Still fully protected. Stitches out at around 10 to 14 days if you had an open repair.
- Pin care if you have wires.
- Keep the fingers honest. A stiff index finger is a common and avoidable side effect of weeks in a thumb cast.
Weeks 6 to 8: wires out, thumb starts moving
- Wires typically removed once the X-ray shows the bone is healing.
- Gentle thumb movement starts, splint on between exercise sessions. This is where hand therapy takes over.
Weeks 8 to 12: range, web space, light pinch
- Range of motion work in earnest.
- Web space stretching, because the space between thumb and index finger tightens after weeks of immobilization, and a tight web costs you function directly.
- Light pinch (coins, buttons, a pen) usually starts here, once cleared.
Months 3 to 6: strength and heavier use
- Pinch and grip strengthening, then heavy use, sport and manual work.
- Pinch strength is the slowest thing to return and usually the last to normalize.
Months 6 to 12: the long tail
Pinch strength can keep creeping up for a year. Aching with heavy or cold work can persist about that long too.
Getting your pinch back: exercises after a thumb base fracture
Only once your surgeon or hand therapist has cleared thumb movement, usually around week 6 to 8. Gentle, within comfort, never forced.
- Tip-joint bends. Hold the thumb just below the tip joint and bend only the tip. 10 reps, 4 to 6 times a day.
- Thumb to each fingertip. Make an “O” with each finger in turn. 10 rounds.
- Thumb slide. Slide the thumb tip across the palm towards the base of the little finger. 10 reps.
- Web space stretch. Gently open the space between thumb and index finger and hold 20 to 30 seconds, 3 to 5 times, a few times a day. A night splint that holds the web open helps if it’s getting tight. See C-bar splints.
- Pinch progression. Light objects first, then soft putty pinches from around 8 to 12 weeks, then key turns and jar lids from around 12 weeks.
When the cast comes off, chase the web space and the pinch. Those are the two things that decide whether the thumb works, and neither returns on its own.
Will I get arthritis after a Bennett’s or Rolando fracture?
Honest expectations: some stiffness at the base of the thumb is common. And there’s an increased chance of arthritis at that joint later in life even with a good result, because the joint surface has been injured.
The risk is higher with a Rolando pattern and with any step left in the joint. Good treatment reduces that risk substantially rather than removing it. If it does turn up years later, see thumb base arthritis for what helps.
When can I work, drive and play sport?
- Desk work: often within 1 to 2 weeks, typing around the cast.
- Light manual work: around 8 to 10 weeks.
- Heavy manual work and tools: 12 weeks or more. See returning to work after a hand injury.
- Driving: not in a forearm thumb spica for most people. Usually once you’re out of it and can grip the wheel and turn a key firmly, often 8 weeks or more. See driving with a hand injury, cast or splint.
- Non-contact sport: around 10 to 12 weeks.
- Ball sports, contact sport and boxing: 12 weeks or more, sometimes with a protective splint, and only with your surgeon’s say-so.
Questions people ask
Can a Bennett’s fracture heal without surgery? The bone will heal either way. The question is whether it heals in the right place. Truly undisplaced ones can be cast with close X-ray follow-up. Most displaced ones need fixing, cos the muscle pull keeps opening the gap.
How long does a Rolando fracture take to heal? The bone needs at least 6 to 8 weeks, and often up to 12, to heal. Useful function takes 3 to 6 months, and pinch strength can keep improving for up to a year.
Is a Bennett’s fracture just a broken thumb? It’s a broken thumb in the worst possible spot: right inside the joint you pinch with.
Go to the ER today if
- Your fingers or thumb turn white, blue or cold.
- Pain in the cast is severe and climbing despite elevation and pain pills.
Call your surgeon today if
- A wire site is red, oozing or smelly, or you have a fever.
- A wire has moved, bent or fallen out.
- New numbness or tingling over the back of the thumb or index finger. A small skin nerve runs close to where the wires go.
- The cast is cracked, soaked or so loose the thumb moves inside it.
- Pain escalating after the first week, with a shiny, swollen, color-changed, very sensitive hand.
Get it checked if
- You’re being treated in a cast and no repeat X-ray is booked within two weeks.
- The thumb can’t reach the base of your little finger by week 12.
- The web space is visibly tighter than the other hand at week 10.
- Pinching is still painful at 4 to 6 months, or the base grinds or clunks.
For breaks elsewhere in the thumb, see broken thumb.
The bone will heal by itself. The pinch won’t.
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. Follow your own surgeon’s protocol where it differs from anything 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.