Terrible triad injury

The "terrible triad" is the elbow injury surgeons fear most. It's three injuries that happen together: an elbow dislocation (the joint pops out), a fracture of the small bony hook on the front of the ulna that helps lock the elbow in place (the coronoid), and a fracture of the disc-shaped top of the smaller forearm bone (see radial head fracture for more on that piece). The combination tears out every backup the elbow has — the two main bony buttresses, the inner and outer ligaments, and the front capsule — leaving nothing to hold the joint in place. Without surgical reconstruction of every injured structure, the elbow simply re-dislocates.

A high-energy elbow injury with an obvious deformity makes the dislocation easy to spot. After your provider pops the joint back into place, a CT scan is mandatory — it maps both fractures in 3D so the surgical team can plan exactly which structures need fixing in what order. Careful nerve and pulse checks are essential before and after reduction.

Every terrible triad injury needs surgery — there's no non-operative path that ends in a stable, working elbow. The reconstruction usually addresses all three components in one operation: fixing or replacing the radial head, repairing or pinning the coronoid fracture, and reattaching the torn outer ligament (and sometimes the inner one too).

External patient-education references and related OSI pages for additional background:

• Britannica — Joint (anatomy)
• AAOS OrthoInfo — patient education library
• OSI glossary — orthopedic terminology in plain language