The Ulna is one of two bones in your forearm. When holding your hands out in front of you with palms up, the ulna is the bone on the inside or on the side of your small finger. This bone may break from falling on an outstretched hand or from blunt force trauma. Symptoms include pain, swelling, bruising, and/or weakness with wrist movement. The goal of treatment is to realign the bone to allow for proper bone healing.