Ulna fracture

The ulna is the more stable of the two forearm bones. It runs from the back of your elbow to the wrist on the little-finger side — a straight, firm line along which the radius rotates. When you extend your arm to point at something, grip, or hold, it is the ulna that provides the anchor. It is not the mobile part, but the pillar.

When this pillar breaks, something happens that reaches deeper than an orthopedic finding. Your most stable forearm bone gives way. Precisely the part that otherwise stretches, points, reaches, directs — it capitulates. And suddenly the movement that was previously self-evident is no longer possible. You can no longer point. You can no longer grip. You can no longer reach.