Bennett Fracture
A Bennett fracture is a fracture-dislocation of the 1st carpometacarpal (CMC) joint (between the metacarpal and the carpal bones at the wrist). There is a fracture of the base of the metatarsal (the bone from the wrist to the thumb), as well as a subluxation of the joint.
Symptoms of a Bennett Fracture
- Immediate severe pain at the thumb side of the wrist.
- Rapid swelling.
- Difficulty and severe pain when trying to move the thumb.
- The thumb may appear deformed.
This is a serious injury which if not treated correctly can cause permanent disability, with particular problems when bringing the thumb across the palm of the hand and pinching with the index or middle fingers.
The most common cause of a Bennett fracture is a punch with a clenched fist. It is also common in Football goal keepers and Rugby or American Football players.
Treatment
Treatment of a Bennett fracture is usually a surgical procedure followed by a 4-6 week period of immobilisation in a Plaster cast.
The operation involves reduction of the subluxation (putting the bones back in place) and fixation of the fracture using wires.
Following the immobilisation period, mobilisation of the surrounding joints by a physical therapist, as well as mobility and strengthening exercises at home should be used to get the thumb back to full function.
On returning to sport, a protective thumb splint, support or taping may be used.
