Buried intramedullary K-wire without a splint sped early hand recovery after metacarpal fracture

Design

Single-centre randomised controlled trial

Population

20 adults with isolated transverse shaft fractures of the second to fifth metacarpals

Primary outcome

MCP joint range of motion and DASH score at 4, 8 and 12 weeks

Effect

Better ROM and DASH at 4 weeks with intramedullary wire; no difference at 8 and 12 weeks

A single-centre randomised trial in the Journal of Hand Surgery (Asian-Pacific Volume), published on 31 August, compared two fixations for isolated transverse shaft fractures of the second to fifth metacarpals in 20 patients: a single buried intramedullary K-wire with no immobilisation, or percutaneous transverse K-wires with four weeks of splinting.

At four weeks, the intramedullary group had better metacarpophalangeal joint motion and lower DASH disability scores, by more than the minimal clinically important difference. By 8 and 12 weeks, after wire removal, there was no difference. All fractures united, with no malrotation, loss of reduction, wire migration or infection in either group.

The trial is very small and unblinded, so it cannot establish safety, but it supports what many hand surgeons already suspect: a stable intramedullary wire allows the hand to move straight away, and the early gain in function is worth having for patients who need to return to work.

• For an isolated transverse metacarpal shaft fracture, consider a single intramedullary K-wire that allows early motion.
• Check rotation clinically before and after fixation — malrotation is the complication that matters.
• Start active finger motion early if the fixation is stable.
• Discuss return to work: the advantage was in the first month.

Why it matters

It questions routine splinting after stable intramedullary fixation of the metacarpal.

Don't overread it

Twenty patients in one centre; the trial cannot establish that the approach is safe in general.

The statistics, in plain English

With 10 patients per group, only large differences can be detected. The early difference exceeded the threshold patients notice; the absence of later difference may reflect the small size as much as true equivalence.

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