| Ulnar tunnel syndrome | |
|---|---|
| Other names | Guyon's canal syndrome |
 | |
| Depiction of classic ulnar sensory distribution, including ulnar-4th and 5th fingers. Note that this diagram does not portray hand muscles affected by ulnar neuropathy. | |
| Specialty | Orthopedic surgery  |
Ulnar tunnel syndrome, also known as Guyon's canal syndrome or Handlebar palsy, is ulnar neuropathy at the wrist where it passes through the ulnar tunnel (Guyon's canal).[1] The most common presentation is a palsy of the deep motor branch of the ulnar nerve causing weakness of the interosseous muscles. Ulnar tunnel syndrome is usually caused by a ganglion cyst pressing on the ulnar nerve, other causes include traumas to the wrist and repetitive movements, but often the cause is unknown (idiopathic).[2] Long distance bicycle rides are associated with transient alterations in ulnar nerve function.[3] 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.
- ^ Hatch, Daniel (August 20, 2014). "Ulnar Tunnel Syndrome". Orthobullets. Retrieved Sep 7, 2014.
- ^ Taylor, Michele. "What Is Ulnar Tunnel Syndrome? Causes, Symptoms, Treatment". WebMD. Retrieved 15 June 2024.
- ^ Akuthota, V.; Plastaras, C.; Lindberg, K.; Tobey, J.; Press, J.; Garvan, C. (2005). "The effect of long-distance bicycling on ulnar and median nerves: an electrophysiologic evaluation of cyclist palsy". The American Journal of Sports Medicine. 33 (8): 1224–30. doi:10.1177/0363546505275131. PMID 16000656.