Bennett, BMJ 1886 - On Fracture of the Metacarpal Bone of the Thumb

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On Fracture of the Metacarpal Bone of the Thumb

Bennett·BMJ·1886·70 citations·Case series

Free Full Text·DOI·PubMed

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This is Bennett's own 1886 paper describing the intra-articular fracture-dislocation at the base of the first metacarpal that now bears his name. The paper defines the fracture anatomy, argues that prior reports of 'partial thumb metacarpal luxation' were this fracture misdiagnosed, and corrects his earlier claim that it occurs only on the right hand. It remains the primary source for one of the most tested hand fractures in orthopedic education.

Key Findings

The fracture is an oblique intra-articular line that detaches the palmar half or more of the first metacarpal articular surface, leaving the shaft free to displace dorsally. Because the fracture does not reach the dorsal cortex, no shortening is detectable — which is exactly why it looks like a subluxation on exam and gets missed.
Bennett identified this as the most common fracture of the entire metacarpus, yet it had been systematically overlooked before his 1881 report. Six healed specimens were displayed at the British Medical Association alongside nine fractures of all other metacarpal bones combined, illustrating the relative frequency.
The saddle-shaped (sellar) geometry of the first CMC joint makes a stable partial dislocation mechanically impossible. Bennett uses the analogy of a rider and saddle: you either fall off completely or return to your seat. There is no stable in-between. When you see apparent partial dislocation at this joint, look for the fracture.
The injury is not limited to the right hand. Bennett formally corrects his earlier published claim here, documenting three left-sided cases, two of them seen at Sir Patrick Dun's Hospital. Both hands are at risk.
Early swelling routinely causes the fracture to be missed at first presentation, as illustrated by Bennett's own case of a medical student whose fracture went unrecognized for seven days because of wrist swelling. Maintain a high index of suspicion even when initial exam is unremarkable.
Untreated fractures produce a persistent bony prominence at the thumb base yet may leave hand movement unimpeded for months, until high-demand use exposes the deficit. The same student who reported no functional loss later winced while performing an amputation through the hip joint in Bennett's operative surgery course, prompting Bennett's conclusion about the long-lasting consequences of untreated injury.
Treatment: closed reduction by longitudinal traction, a molded compress over the displaced fragment, and a splint from the distal radius to the thumb tip for at least 4 weeks.

Board PearlThe sellar geometry of the first CMC joint makes stable partial dislocation impossible — apparent subluxation at the thumb base is Bennett fracture until proven otherwise.

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|

On Fracture of the Metacarpal Bone of the Thumb

Bennett·BMJ·1886·70 citations·Case series

Free Full Text·DOI·PubMed

|

This is Bennett's own 1886 paper describing the intra-articular fracture-dislocation at the base of the first metacarpal that now bears his name. The paper defines the fracture anatomy, argues that prior reports of 'partial thumb metacarpal luxation' were this fracture misdiagnosed, and corrects his earlier claim that it occurs only on the right hand. It remains the primary source for one of the most tested hand fractures in orthopedic education.

Key Findings

The fracture is an oblique intra-articular line that detaches the palmar half or more of the first metacarpal articular surface, leaving the shaft free to displace dorsally. Because the fracture does not reach the dorsal cortex, no shortening is detectable — which is exactly why it looks like a subluxation on exam and gets missed.
Bennett identified this as the most common fracture of the entire metacarpus, yet it had been systematically overlooked before his 1881 report. Six healed specimens were displayed at the British Medical Association alongside nine fractures of all other metacarpal bones combined, illustrating the relative frequency.
The saddle-shaped (sellar) geometry of the first CMC joint makes a stable partial dislocation mechanically impossible. Bennett uses the analogy of a rider and saddle: you either fall off completely or return to your seat. There is no stable in-between. When you see apparent partial dislocation at this joint, look for the fracture.
The injury is not limited to the right hand. Bennett formally corrects his earlier published claim here, documenting three left-sided cases, two of them seen at Sir Patrick Dun's Hospital. Both hands are at risk.
Early swelling routinely causes the fracture to be missed at first presentation, as illustrated by Bennett's own case of a medical student whose fracture went unrecognized for seven days because of wrist swelling. Maintain a high index of suspicion even when initial exam is unremarkable.
Untreated fractures produce a persistent bony prominence at the thumb base yet may leave hand movement unimpeded for months, until high-demand use exposes the deficit. The same student who reported no functional loss later winced while performing an amputation through the hip joint in Bennett's operative surgery course, prompting Bennett's conclusion about the long-lasting consequences of untreated injury.
Treatment: closed reduction by longitudinal traction, a molded compress over the displaced fragment, and a splint from the distal radius to the thumb tip for at least 4 weeks.

Board PearlThe sellar geometry of the first CMC joint makes stable partial dislocation impossible — apparent subluxation at the thumb base is Bennett fracture until proven otherwise.

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