Let the metacarpal move: earlier hand function with intramedullary fixation

Design

Single-centre randomised controlled trial (Level II therapeutic)

Population

20 adults with isolated transverse metacarpal shaft fractures

Primary outcome

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

Effect

Better MCP motion and lower DASH at 4 weeks (exceeding MCID); no difference at 8-12 weeks; all united

After fixing a transverse metacarpal shaft fracture, many surgeons still splint for weeks out of caution. This small single-centre randomised trial tested whether a single buried intramedullary K-wire with immediate mobilisation beats percutaneous transverse K-wire fixation followed by four weeks of splinting.

With 20 patients, the immediate-mobilisation group had significantly better metacarpophalangeal joint range of motion and lower DASH disability scores at four weeks, with differences exceeding the minimal clinically important difference. Once the transverse wires were removed, outcomes converged: no difference in range of motion or DASH at eight and twelve weeks. All fractures united, and there were no cases of malrotation, loss of reduction, wire migration, infection or fixation failure in either group.

The practical point is that stable intramedullary fixation can be trusted to move early, buying faster return of hand function without compromising healing. The caveat is size: this is 20 patients from one centre, so it supports, rather than settles, an early-mobilisation approach.

• Randomised trial of intramedullary K-wire with immediate motion versus transverse K-wire plus four weeks' splinting.
• Early-mobilisation group had better MCP range of motion and lower DASH at four weeks, beyond the clinical threshold.
• Outcomes were equal at eight and twelve weeks after wire removal.
• All fractures united, with no malrotation, migration, infection or fixation failure in either group.
• Consider early mobilisation after stable intramedullary fixation of suitable transverse metacarpal fractures.

Why it matters

It questions reflexive post-fixation splinting, where the immobilisation itself is what delays hand recovery.

Don't overread it

This was 20 patients at a single centre; it supports early mobilisation after stable intramedullary fixation but is too small to be definitive or to cover all fracture patterns.

The statistics, in plain English

The four-week differences exceeded the minimal clinically important difference, so they are likely real and meaningful, but with only 20 patients the trial is too small to detect uncommon complications or to generalise confidently.

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