Case: A 15-year-old girl presented with complaints of pain and feeling of a snapping on the medial side of her left elbow. No pathology was detected on XRay, Magnetic Resonance Imaging, and nerve conduction evaluations. Then, the dynamic Ultrasound showed that the ulnar nerve has snapped. We performed surgery to treat the ulnar nerve that was transposed under the fascia of the muscle. The medial head of the triceps muscle was elevated and moved laterally. All of her symptoms were resolved.