A Bennett’s fracture is a fracture to the base of the first metacarpal bone, which is located at the base of the thumb. They are common in combat-type sports, such as UFC.
What Is a Bennet’s Fracture?
A Bennett’s fracture is a fracture to the base of the thumb metacarpal. It is an intra-articular fracture involving the carpometacarpal (CMC) joint, which is caused by an axial load through the slightly flexed metacarpal, such as a punch type movement. Therefore it is common in combat-type sports, such as UFC.
They can be an unstable fracture and can sublux or dislocate at the CMC joint. This is due to the pull of the muscles and the ligament. The triangular fragment remains still due to the attachment of the ‘beak’ ligament or anterior oblique ligament.
The metacarpal head is then pulled in towards the palm of the hand by the adductor pollicis (AP) and the base of the metacarpal is pulled dorsally, proximally and radially by the abductor pollicis longus (APL).
Treating a Bennett’s Fracture
Many of these fractures require surgery to stabilise the fracture due to the deforming forces from the muscles. Splinting of the thumb and wrist will be required post surgery to protect the fracture whilst it heals.
A hand therapist, often known as a hand physio or occupational therapist, will manage your wound, scar and swelling. Range of motion exercises and strengthening are also important.