Ulnar_tunnel_syndrome
Ulnar tunnel syndrome
Medical condition
Ulnar tunnel syndrome, also known as Guyon's canal syndrome or Handlebar palsy, is ulnar neuropathy at the wrist where it passes through the Guyon canal.[1] The most common presentation is a palsy of the deep motor branch of the ulnar nerve causing weakness of the interosseous muscles. Many are associated with a ganglion cyst pressing on the ulnar nerve, but most are idiopathic. Long distance bicycle rides are associated with transient alterations in ulnar nerve function. [2] Sensory loss in the ring and small fingers is usually due to ulnar nerve entrapment at the cubital tunnel near the elbow, which is known as cubital tunnel syndrome, although it can uncommonly be due to compression at the wrist.