Cubital Tunnel Syndrome Brace for Ulnar Nerve Entrapment Treatment At some point in our lives, we’ve all bumped our “funny bone.” But, it’s no laughing matter when you experience shock-like elbow throbbing combined with pinky and ring finger numbness and tingling. This sensation occurs when the ulnar nerve in your arm becomes compressed, entrapped, pinched, or irritated. Cubital tunnel syndrome is a condition that occurs when the ulnar nerve, which passes through the cubital tunnel—also known as the “funny bone” nerve—becomes inflamed, swollen, and irritated due to pressure or repetitive stretching.