Metacarpal Fracture
A break in one of the long bones of the hand
Quick Facts
- Type: Hand bone fracture
- Common causes: Punching, falls, crush injuries
- Boxer's fracture: Break at the neck of the small-finger bone
- Typical healing: About 4-6 weeks
Overview
The metacarpals are the five long bones in the palm that connect each finger to the wrist. A metacarpal fracture is a break in one of these bones. They are among the most common hand fractures, especially in young, active people.
A frequent type is the so-called boxer's fracture, a break near the knuckle end of the bone leading to the small finger, which often happens when a closed fist strikes a hard object. Most metacarpal fractures heal well, but proper alignment is important so the hand grips and the fingers line up correctly.
Symptoms
- Pain, swelling, and tenderness over the back of the hand
- Bruising that may spread across the hand
- A knuckle that looks flattened, sunken, or out of place
- Pain when gripping, making a fist, or moving the affected finger
- A finger that crosses over or points in the wrong direction when you bend it, which is a sign of rotation that needs medical attention
Causes
Metacarpal fractures result from force applied to the hand:
- Direct impact: Punching a wall or another person is the classic cause of a boxer's fracture.
- Falls: Landing on an outstretched or clenched hand.
- Crush injuries: The hand caught between heavy objects or in machinery.
- Sports and accidents: Collisions and direct blows during activity.
Risk Factors
- Contact sports and combat sports
- Physical altercations and punching hard surfaces
- Weak bones from osteoporosis
- Occupations with machinery or heavy lifting
Diagnosis
A doctor examines the hand for swelling, deformity, tenderness, and finger alignment, checking for rotation by watching how the fingers bend. X-rays from several angles confirm the fracture and show its location, angle, and whether it extends into a joint. In complex cases a CT scan may be used.
Treatment
Treatment depends on which bone is broken, how angled the break is, and whether the finger is rotated:
- Splint or cast: Many metacarpal fractures, including most boxer's fractures, heal with a splint or cast that supports the hand for several weeks.
- Reduction: If the bone is significantly angled or displaced, the doctor may realign it before splinting.
- Surgery: Pins, screws, or plates may be needed when the break is unstable, badly displaced, rotated, involves a joint, or breaks the skin.
Early gentle finger movement, once advised by the care team, helps prevent stiffness. Most fractures heal in about 4 to 6 weeks, with full strength returning over a few months.
Prevention
- Avoid punching hard surfaces; use proper technique and hand protection in combat sports
- Wear protective gloves for high-risk work and sports
- Keep bones strong with adequate calcium, vitamin D, and exercise
- Reduce fall risks at home and at work
When to See a Doctor
See a doctor for hand pain and swelling after an injury, especially if a knuckle looks sunken, a finger looks rotated or crosses over its neighbor when you bend it, or you cannot make a fist. Seek emergency care if the bone breaks through the skin, the hand is numb or pale, or there is severe deformity or uncontrolled bleeding.
Frequently Asked Questions
What is a boxer's fracture?
A boxer's fracture is a break near the knuckle of the bone leading to the small finger, usually from punching a hard object with a closed fist. It is one of the most common metacarpal fractures and often heals with a splint or cast.
Can a metacarpal fracture heal without a cast?
Many stable, well-aligned metacarpal fractures heal with a splint or cast and rest. However, breaks that are badly angled, rotated, or displaced may need realignment or surgery, so all suspected fractures should be evaluated.
How long does a metacarpal fracture take to heal?
Most metacarpal fractures heal in about 4 to 6 weeks, although full grip strength and motion can take a few months to return. Following your care team's instructions on splinting and gentle movement helps recovery.
Why does the doctor check if my finger rotates?
Rotation means the broken bone has twisted, which can cause fingers to cross over each other when you make a fist. Even a small rotation can affect hand function, so it often needs to be corrected before the bone heals.
References
- American Academy of Orthopaedic Surgeons (OrthoInfo). Hand Fractures.
- American Society for Surgery of the Hand. Metacarpal Fractures.
- MedlinePlus, U.S. National Library of Medicine. Fractures.