Objective: To discuss the concept of ulnar tunnel at the wrist, the types, causes, traits of compression, diagnosis, and clinical significance of ulnar tunnel syndrome (UTS).
Methods: Thirty-nine cases diagnosed as having UTS from 1986 were retrospectively reviewed combined with previous relevant literature.
Results: Ulnar tunnel included Guyon's canal, piso-hamate tunnel and hypothenar segment. There were 8 types and many causes of UTS. Some patients had compression in more than one zones and might be associated with carpal tunnel syndrome or cubital tunnel syndrome. UTS could be diagnosed through clinical manifestations and electrophysiological examination.
Conclusion: Defining the concept of ulnar tunnel and the knowledge of the complexity and rarity of UTS can effectively guide diagnosis and treatment.