A fist that hits a wall, a knuckle that disappears under the skin, a joint that flattens out: the boxer's fracture looks serious and behaves well. It also has the rare feature of tolerating a deformity better than a cast; up to 70 degrees of angulation, no study has measured the loss of function that common sense promised. The real risk lies elsewhere, in a defect that does not show on the AP radiograph and that the examination takes ten seconds to flush out.

A synthesis written from primary sources verified one by one on PubMed: identifier resolved, journal, year and author list checked, abstract read before citation. Full bibliography at the end of the article.

Clinical summary

The boxer's fracture is one of the rare fractures where the radiographic appearance is more worrying than the functional result, and where immobilisation costs more than it brings in.

What is a boxer's fracture, and why does the head tilt?

Understanding volar angulation means understanding why it cannot be held reduced, and why that does not matter.

A fracture of the neck, not of the shaft

The boxer's fracture means a subcapital fracture of the fifth metacarpal: the fracture line runs at the neck, the narrowed portion immediately proximal to the metacarpal head, the one that forms the “knuckle” of the joint when the fist is closed. The mechanism is almost always the same: a closed fist that strikes a hard object, with the force transmitted along the axis of the fifth ray1.

That location is not incidental. The neck is a transition zone between a strong cortical shaft and a cancellous epiphyseal head: mechanically it is the weak link of the ray. And the fifth ray is, of all the metacarpals, the most exposed: first because it is on the ulnar side, at the border of the fist, so the first in contact; and second because its carpometacarpal joint is the most mobile of the long rays, which shifts a share of the loading towards it.

The European series by Dominguez-Prado, which classified 1,341 hand fractures in a population of 470,000 inhabitants, places the fifth metacarpal at the top of the metacarpals involved, with 39.7 % of the fractures in that group, and the distal end as the commonest location in the young man2.

The angulation is produced by muscles, and that is what makes it irreducible

The distal fragment, the head, tilts towards the palm. That angulation is not the direct result of the impact, but of the intrinsic muscles: the interossei pass in front of the longitudinal axis of the metacarpal, and their pull flexes the distal fragment as soon as cortical continuity is broken. Those muscles do not relax because the hand has been put in plaster.

That is the whole logic of what follows. A reduction is easy to obtain under anaesthesia, by pushing on the head through the flexed phalanx. It is almost impossible to hold by external means. The randomised trial by Martínez-Catalán measured it directly: in the reduced and casted group, the reduction was lost by three weeks of follow-up, and the residual radiographic angulation observed at 3 and 9 weeks was equivalent to that of the group simply buddy taped with no attempt at reduction at all6.

What the patient sees, and what worries them

The cosmetic complaint deserves to be heard rather than brushed aside, because it is often the real reason for the follow-up appointment. The angulation makes the prominence of the metacarpal head disappear from the back of the hand: the closed fist shows a hollow where there should be a knuckle. It is visible, permanent if the fracture unites in angulation, and with no demonstrated functional consequence.

The series by France, which specifically looked for fractures united with more than 70° of angulation, provides here the argument most useful in the clinic: of 364 fractures, 40 (11 %) had united beyond 70°, and among the 15 patients reviewed (mean angulation 73°, up to 77°), all scored at the highest level of the hand function scale, and 80 % reported a QuickDASH of zero, that is no trouble at all. Nearly half of them worked in a manual trade, and the dominant hand was affected in 87 % of cases8.

That result does not say that the deformity is desirable. It says that between a deformed hand and an immobilised hand, the measured functional gap tilts towards mobility.

Who fractures the fifth metacarpal, and in what circumstances?

A male, young and rarely sporting fracture: the name misleads about the real mechanism.

A young man, a wall, a dominant hand

Nakashian's study on the American NEISS database, which extrapolates to 160,790 metacarpal fractures over five years, gives the clearest portrait available. Overall incidence is 13.6 per 100,000 person-years. It peaks in 10 to 19-year-olds (38.8) then in 20 to 29-year-olds (28.4), and collapses afterwards. The male-to-female incidence ratio is 5.08 : 23.0 against 4.5 per 100,000. The two dominant mechanisms are contact with a wall or a door and falling; the commonest place is the home, ahead of leisure venues1.

In other words: the name “boxer's fracture” refers to a fracture that, in the great majority of cases, does not happen in boxing. The trained boxer strikes with the second and third rays, protected by a wrap and a glove; it is the untrained fist, striking a wall with its ulnar border, that produces this fracture. The paediatric literature has even devoted a famous title to that scene: “another angry adolescent, another boxer's fracture?”.

The share of sport, and what it covers

Aitken and Court-Brown analysed 1,430 hand fractures occurring in one year in Edinburgh: 22.4 % were sport-related, with 86 % men and a mean age of 24. Metacarpals accounted for 33.8 % of those sporting fractures, and the first and fifth rays were the most affected. A notable fact for practice: 87.2 % of those fractures were treated as outpatients, and open fractures were only 2.2 %3.

That proportion is useful to bear in mind so as not to over-read the context: the boxer's fracture is not primarily a sports injury, and the typical patient is not a return-to-competition problem but a return-to-work and everyday-activities one.

What clinical examination, and what manoeuvre should never be left out?

The whole point of the examination comes down to one sentence: the radiograph shows what does not count, and misses what does.

The manoeuvre that decides: make them close the fist

Volar angulation is measured on a lateral or oblique radiograph. Rotational deformity, on the other hand, is visible on no standard view. It shows only in flexion, because it is in flexion that the axes of the fingers converge: the four long fingers, flexed together, must all point towards the scaphoid tubercle. A ray whose metacarpal has united in rotation makes its finger deviate out of that bundle, and the little finger comes to overlap the ring finger.

It is a ten-second examination, and it is the only one that changes what you do. It is done before any treatment and is rechecked at every follow-up appointment, because secondary displacement can appear. Royle, in a prospective study of 98 metacarpal fractures, points out a practical difficulty met at the bedside: pain often limits metacarpophalangeal flexion just after the fracture, which makes assessment awkward. For that reason he recommends adding examination of the nail seen end-on, whose plane must stay parallel to that of the neighbouring nails10.

The same study gives the order of magnitude of the problem: of 91 consecutive patients, a quarter had minor rotation of less than 10°, only five exceeded that threshold, and two required surgery for rotational instability10. Significant rotational deformity is therefore rare: that is precisely why it gets left out, and precisely why it must be looked for systematically.

The rest of the examination, in order

Examination of a hand injured after a punch follows a sequence whose order matters: what is urgent first, what is deforming next, what is functional last.

What imaging brings, and what it does not

Three views are enough in the vast majority of cases: AP, lateral and oblique. The oblique at 30-45° clears the neck of the fifth metacarpal from the overlap of the neighbouring rays and gives the most reliable measure of angulation: it was in fact on the oblique view that the France series measured its angulations above 70°8. The New England Journal of Medicine published a reference clinical and radiographic image of it, useful for calibrating on the typical appearance25.

Ultrasound has been the subject of one description: Thom et al. report the use of point-of-care ultrasound to guide a closed reduction and check the improvement in angulation before radiographic confirmation24. It is a case report, not a validated practice, and it is chiefly worth noting as a reminder that ultrasound sees the metacarpal neck. For the physiotherapist, the interest is indirect: it explains why some patients arrive with an ultrasound report and no recent radiograph.

How much volar angulation can really be accepted?

This is the question most often asked about this fracture, and the one where the gap between the textbooks and the trials is widest.

The thresholds in circulation, and what supports them

You regularly read tolerance thresholds of 30°, 40°, sometimes 50° for the fifth metacarpal, presented as limit values beyond which reduction is required. Those figures have an apparent logic: the more the head tilts, the more the metacarpal functionally shortens, the more the mechanics of the extensor change.

The literature search conducted for this article found no controlled trial establishing those thresholds. What it does find are trials that tested tolerance to far greater angulations and found no functional loss. It is a reversal that has to be stated clearly, because it changes what you do.

The reference work is that of Statius Muller et al. Forty patients were randomised between an ulnar gutter cast for three weeks and a compression bandage for one week then immediate mobilisation within the limits of pain. The inclusion criterion was an angulation accepted up to 70° ; the actual mean angulation was 39°, with values ranging from 15 to 70°. At 6 and 12 weeks, no statistical difference was found in metacarpophalangeal range, satisfaction, pain, return to work and leisure, or the need for physiotherapy. The authors conclude, in terms worth quoting precisely, that reducing a fracture angulated by less than 70° “does not seem to be of use” as regards metacarpophalangeal mobility5.

The relevant threshold is not the one at which the deformity becomes visible, but the one at which function deteriorates. No trial has managed to place it below 70°.

And beyond 70 degrees?

That is the next question, and the France series answers it, with the limitations of its level of evidence. It is a retrospective review of adult patients with an isolated closed fracture of the neck of the fifth metacarpal, united with more than 70° of angulation, treated without surgery, with a minimum follow-up of six months.

Of 364 fractures identified, 40 (11 %) had angulation above 70°, between 71 and 82°. Fifteen patients could be reviewed, with a mean angulation of 73° and a mean follow-up of 32 months. The results: all obtained the highest rating on the hand function scale, 80 % reported a QuickDASH of zero, and 87 % had SF-12 quality of life scores at or above average. Seven of the fifteen patients worked in a manual trade, and thirteen out of fifteen had the dominant hand affected8.

This result has to be read for what it is: a retrospective series, with an inclusion rate of 38 % among eligible patients, therefore exposed to selection bias, since dissatisfied patients may have been harder to reach, or the reverse. It does not demonstrate that 80° is equivalent to 20°. What it does demonstrate is that the opposite claim, very widespread, has no support : you cannot tell a patient that an angulation of 75° condemns them to a deficient hand.

What the angulation really costs

Saying that angulation is tolerated does not mean that it has no effect. Three consequences are documented or mechanically expected, and they must be distinguished by their level of evidence:

• Loss of the prominence of the metacarpal head : constant, visible, permanent after union. It is a real cosmetic effect, which the France series shows does not prevent a QuickDASH of zero in 80 % of patients8.
• A possible prominence of the head on the palmar side, which may get in the way when gripping hard objects. That trouble is described clinically; the published series do not quantify it usably, and honesty requires it to be presented as a possibility, not as a quantified risk.
• Functional shortening of the ray, with a theoretical change in the excursion of the extensor. It is the mechanical argument most often invoked to justify reduction. None of the studies found here has translated it into a measurable loss of extension within the ranges of angulation tested.

Should you reduce, immobilise, or simply buddy tape?

Five randomised trials, a Cochrane review and a network meta-analysis converge on the same answer, and it is counter-intuitive.

What the Cochrane review says, and what it does not

The Cochrane review by Poolman et al. compared functional treatment with immobilisation, and the different immobilisation methods with each other, for closed fractures of the neck of the fifth metacarpal in adults. Five trials, 252 participants. The verdict is cautious: no non-operative treatment regimen can be recommended as superior to another, the studies being of limited quality and heterogeneous. The authors note a major methodological point: none of the studies included used a validated measure of hand function as its primary outcome4.

That review is from 2005. It would be a mistake to stop there, because the trials that were missing then, the ones that measure the DASH and quickDASH, have since been published. It is a case where the benchmark systematic review is older than the decisive data, and where reading only Cochrane would lead you to conclude “we do not know” when the later trials do know.

The later randomised trials: buddy taping holds its own against the cast

Pellatt 2019, Annals of Emergency Medicine. A randomised trial in two Queensland hospitals, 97 patients aged 18 to 70 with an uncomplicated boxer's fracture. Comparison: buddy taping of the ring and little fingers against a cast. Primary outcome: quickDASH at 12 weeks. Result: a median of 0 in both groups (interquartile range 0 to 2.3 for buddy taping, 0 to 4 for the cast; difference 0, 95 % CI from 0 to 0). The buddy taping group lost a median of 0 days of work against 2 days for the cast. The authors explicitly recommend the minimal intervention7.

Martínez-Catalán 2020, Journal of Hand Surgery (American). This is the highest-level trial on the question: therapeutic level I. Seventy-two patients with angulation below 70° and without rotational deformity were randomised between buddy taping with no reduction and closed reduction then a cast. At three weeks, the DASH was significantly better in the buddy taping group: 19.7 ± 19.7 against 44.6 ± 15.0. At nine weeks, the advantage persisted in range and in the DASH, with a mean difference of 6.3 points that did not exceed the threshold of clinical relevance. There were more complications in the cast group. And above all: time off work was 28 days shorter with buddy taping6.

Retrouvey 2022, Plastic Surgery. A Canadian multicentre trial, 37 participants, comparing an elastic bandage with early protected movement against immobilisation in a splint. The hand score (bMHQ) did not differ. But at eight weeks, grip strength reached 93 % of Canadian reference values in the early movement group, against 64 % in the splint group : a significant difference11.

A 2022 meta-analysis brought together seven trials and 454 patients on that precise question: it concludes that buddy taping improves pain, range and strength, with no difference in the DASH or in satisfaction, and recommends buddy taping rather than a cast for uncomplicated fractures12.

Why the conclusion holds: the mechanism meets the measurement

The convergence of these trials is easily explained. You immobilise to hold a reduction; but the reduction does not hold, whatever the means: that is measured6. So you end up with the same radiographic result, but paying the price of immobilisation: metacarpophalangeal stiffness, loss of strength, prolonged time off work.

The systematic review by Feehan and Bassett in the Journal of Hand Therapy, covering six studies and 459 patients, had already framed the cautious conclusion that was warranted then: early mobilisation after an extra-articular hand fracture has the potential to restore mobility and strength faster, to allow an earlier return to work, and does not alter fracture alignment, with a consistent benefit and no significant risk identified, but on evidence of insufficient quality14. The trials of 2019, 2020 and 2022 filled exactly that gap.

When the wound changes everything: what to do with a fight bite?

This is the only chapter of this article where an error is paid for with a destroyed joint. It alone justifies looking at the back of the hand before the radiograph.

The mechanism, and why the wound closes over the infection

The fight bite (fight bite, or clenched fist injury) occurs when the thrown fist meets the opponent's teeth. The tooth perforates the skin over a metacarpophalangeal joint, crosses the extensor tendon, and inoculates oral flora into the joint.

The trap is anatomical, and it is twofold. First, the wound is made with the fist closed, the joint in flexion; when the hand opens for the examination, the skin, tendon and capsular planes move relative to each other, and the three openings are no longer aligned. A wound of three millimetres, apparently clean, can therefore cover a septic arthrotomy. Second, the closing of those planes shuts the organism inside a closed, poorly vascularised space, where it thrives before the patient becomes concerned.

De Smet and Stoffelen put it bluntly in their series: these injuries result from the impact of the fist with the opponent's teeth, with perforation of the skin and of the joint, and severe septic arthritis of the metacarpophalangeal joint of the dominant hand is a frequent consequence19.

What the Goon series measures

The retrospective series by Goon et al., covering 34 patients with a confirmed human bite to the hand over seven years, gives the figures most telling for practice:

• 76 % presented already with infectious complications, with a mean time to presentation of 4 days ;
• 80 % were clenched fist injuries ;
• among those, 59 % involved an open joint and 63 % a tendon injury ;
• under an aggressive policy combining early surgery and antibiotics, full joint range was obtained in 83 % of the patients reviewed, but the loss-to-follow-up rate reached more than half18.

The four-day delay is the central item. The patient does not consult for the wound: they consult when the hand swells, that is, when the infection is established.

The microbiology, in one useful sentence

Human and animal bites most often lead to polymicrobial infections, mixing aerobic and anaerobic organisms. Pasteurella is characteristic of dog and cat bites; Eikenella is characteristic of human wounds ; staphylococci, streptococci and anaerobes are common to all mammals16. That distinction is not merely academic: it explains why the antibiotic spectrum chosen must cover Eikenella, an organism that escapes certain penicillinase-resistant penicillins.

The review by Malahias et al. is also a reminder of the scale of the problem: mammalian bites account for up to 1 % of emergency department attendances in the United Kingdom, and clenched fist injuries are reputed to be the worst of the human bites20.

When should you operate, and what does surgery really bring?

The indications come down to three lines, and none of them rests on an angle.

The indications on which the sources consulted agree

The trials cited above all share a methodological feature that must be read carefully: they exclude certain fractures. Martínez-Catalán excludes fractures with rotational deformity6 ; Zawam excludes old, open or malrotated fractures13 ; Pellatt recruits only “uncomplicated” fractures7. Those exclusions draw the surgical indications in outline, better than a guideline would:

You will notice what is not in that list: an angle. None of the sources consulted makes angulation alone an indication for surgery within the ranges studied.

What surgery brings, and what it costs

When it is indicated, surgery delivers on its promise of stability. The interesting question is that of the choice of technique, and that is where Zong's network meta-analysis is useful: on the outcome of total complications, the order is conservative treatment (94.1 %), plating (52.9 %), antegrade intramedullary nailing (37.3 %), transverse pinning (15.7 %)9.

That ranking deserves cautious reading: the outcome is total complications, not effectiveness of reduction. A treatment that does nothing obviously cannot cause a hardware infection: the ranking mechanically favours doing nothing. It remains that, among the surgical techniques themselves, the hierarchy is informative, and that transverse pinning appears there as the greatest source of complications.

Zawam's trial confirms that point from another angle: a plaster gutter against transverse pinning in 84 active adults, angulations of 30 to 70°. Time to radiological union of 7.76 weeks against 7.38 weeks, with no significant difference in union or in functional results, all the patients returning to their previous work and activity level13. Two-thirds of a week gained on union does not justify a percutaneous wire.

With this fracture, the debate is no longer “operate or not” but “why would you operate”, and the answer lies in rotation, in skin breach and in instability, never in an isolated angle.

What do you rehabilitate, and on what timetable?

The physiotherapist rarely intervenes in the union. They intervene in what immobilisation would have cost, and in what remains when it has taken place.

What rehabilitation brings, with figures

The most recent meta-analysis on this precise point, non-thumb metacarpal fractures, was published in 2026 by Hakami et al., preregistered on PROSPERO. Five studies, three randomised trials and two cohorts. Rehabilitation programmes significantly improve:

• hand function : SMD −1.04 (95 % CI −1.54 to −0.54);
• grip strength : mean difference 21.33 (95 % CI 18.81 to 23.83);
• joint range : mean difference 23.43 (95 % CI 20.15 to 26.72).

The authors note that early mobilisation and adherence strategies, including playful ones, are associated with the best functional results, and that minimal immobilisation approaches such as buddy taping suit stable fractures15. The number of studies included (five) means those intervals must be treated with caution: they are narrow for such a small corpus.

The three objectives, in the order in which they count

Recover metacarpophalangeal flexion

That is the deficit that gets in the way, and the one immobilisation creates. The metacarpophalangeal joint stiffens in extension: its collateral ligaments are slack in extension and taut in flexion, so that immobilisation in extension lets them shorten in a position from which flexion becomes hard to win back. That is why, when immobilisation is necessary, the so-called intrinsic-plus position (metacarpophalangeal joints flexed, interphalangeal joints extended) is preferred.

In practice, the session covers isolated active metacarpophalangeal flexion, the composite fist, and tendon glides. Frequency matters more than duration: several short sets spread through the day are better than one long session, and home work does most of the work.

Rebuild grip strength

That is the most measurable deficit, and Retrouvey's trial gives the target: 93 % of reference values at eight weeks in the group treated with early movement, against 64 % in the immobilised group11. A patient who, at eight weeks, plateaus at two-thirds of their expected strength is on the trajectory of the immobilised group, which justifies intensifying, not becoming alarmed.

The fifth ray has a particular function that should be targeted explicitly: it carries the power grip, that of the hammer, the suitcase, the handlebar. That is where the deficit is noticed in manual workers, and it is the work-specific movement that should finish the rehabilitation.

Treat the oedema, which decides the rest

Persistent dorsal oedema mechanically stiffens the metacarpophalangeal joints and makes flexion painful: it precedes stiffness rather than accompanying it. Elevation, repeated active mobilisation, gentle compression and muscle-pump work are its core treatment.

What do concrete clinical cases teach us?

Three published reports, chosen because each documents a possible error: believing the fracture is isolated, believing the closed fist only fractures the neck, believing the wound is superficial.

How do you apply all this from Monday morning?

What reading the trials changes in practice, for the patient who arrives at the clinic with a swollen hand and a prescription.

The decision tree, in five questions

What to say to the patient, and in what words

Three messages come up at every consultation, and they are better formulated in advance:

• On the knuckle that has disappeared. “The joint will stay less prominent. It is visible and it is permanent. Of the patients who united with deformities greater than yours, 80 % report no trouble at all, including when they work with their hands8.” The patient wants to know whether their hand will work; that is the question to answer, not the one about the angle.
• On the absence of a cast. “You will not have a cast, and that is not because your fracture is minor. It is because the trials that compared the two show the same result at three months, with a hand that gets its strength back faster without a cast611.” The absence of immobilisation is often experienced as a failure of care: explaining it avoids doctor shopping.
• On the return. “You are going to move straight away, gently, several times a day. Return to work is on average much faster that way6. »

Five errors that cost dear

With this fracture, the most useful action costs nothing: ask the patient to close their fist and look at their fingers.

Frequently asked questions

Will the knuckle of my joint come back?

No, if the fracture unites in angulation. The prominence of the metacarpal head on the back of the hand is flattened by the displacement of the fragment, and union fixes that position. It is a real cosmetic loss, which should be announced rather than played down. The France series, which reviewed patients united with more than 70° of angulation, finds a QuickDASH of zero in 80 % of them and the best functional rating in all of them8 : the hand works, but it no longer has the same shape.

Why do I not have a cast when I have a fracture?

Because the trials that compared the two strategies find no advantage in the cast. In Pellatt's trial, the functional score at 12 weeks was 0 in both groups7. In Martínez-Catalán's, buddy taping did better at three weeks and allowed a return to work 28 days earlier6. The cast does not hold the reduction, which is lost whatever happens, and it costs stiffness and strength.

Should you operate if the angle exceeds 40 degrees?

The search conducted for this article found no controlled trial establishing a 40° threshold. The available trials tested angulations up to 70° without showing any loss of function56, and the only series above 70° finds good functional results8. The surgical indications that emerge from the sources are rotational deformity, skin breach and instability, not an isolated angle.

How do I know if my finger has “turned”?

By closing the fist slowly: the four long fingers must converge on the same area of the wrist, with none overlapping its neighbour. If pain prevents full flexion, look at the nails end-on: their planes must stay parallel10. Frank overlap justifies a surgical opinion, because it does not correct itself.

I have a small wound on the joint, is that serious?

If it happened while hitting someone, yes, potentially very. A wound of a few millimetres over a metacarpophalangeal joint may correspond to a fight bite, with inoculation of oral flora into the joint. In a series of 34 patients, 76 % arrived already infected at a mean delay of four days, and 59 % had an open joint18. That is a same-day appointment, not tomorrow.

When can I go back to boxing or impact sports?

After union, which occurs on average around 7.4 to 7.8 weeks according to Zawam's trial13. A distinction has to be made between return to work and everyday activities, which is very early with functional treatment, and return to activities that expose the ray to a new direct impact, which requires union to be achieved and strength restored. No study found gives a validated return-to-impact-sport criterion for this particular fracture: the reasoning rests on radiological union, freedom from pain and strength compared with the healthy side.

Is physiotherapy essential?

In Statius Muller's trial, the need for physiotherapy did not differ between the two groups, and many patients recovered without it5. The 2026 meta-analysis nevertheless shows a clear benefit of structured programmes on function, strength and range15. In practice, a hand that moves early and well often recovers on its own; rehabilitation comes into its own when there has been immobilisation, persistent oedema, established stiffness, or when the job demands a high grip strength.

My little finger no longer extends fully, is that normal?

A deficit of active extension is to be investigated, never attributed straight away to oedema. Two documented causes: tendon rupture, described even after a closed fracture of the neck21, and sagittal band injury, which lets the extensor tendon sublux ulnarwards on flexion and which often responds to an extension splint in the acute phase23. The distinction is clinical and is made on active extension against gravity and on the behaviour of the tendon in flexion. That last injury, classically described on the middle finger, has also been reported on the little finger, which forbids ruling it out on that ray26.

Bibliography

Twenty-six references, all verified individually on PubMed: identifier resolved, title, journal, year and author list checked, abstract read before citation. The links point to the PubMed record.

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