Bennett’s fracture is a two part intraarticular fracture of the base of the thumb metacarpal. A small triangular proximal fragment remains attached to the trapezium and the metacarpal shaft is displaced proximally and radially by the pull of abductor pollicis longus.
Clinically there will be swelling and bruising over the base of the thumb. Pinch grasp and opposition will be affected.
Treat pain, immobilize the thumb in a thumb spica and referral to a hand surgeon for urgent review as the fracture is an unstable one.
Rolando’s fracture is comminuted intraarticular fracture of the base of the thumb and is more difficult to treat.