Relationship between morphology of transverse bundle of ulnar collateral ligament and adjacent tissues.
PURPOSE
The purpose of this study was to clarify the incidence of the transverse bundle (TB) of the ulnar collateral ligament (UCL), the relationships between TB morphology and morphology of the anterior bundle (AB) or posterior bundle (PB) of the UCL, and the relationship between the TB and the posterior common tendon (PCT).


METHODS
This study examined 38 elbows from 23 cadavers. TB, AB, and PB were classified morphologically. The TB was classified as: type I, TB does not continue the entire length of the AB; or type II, TB continues the entire length of the AB. The AB and PB were classified as: type I, could be separated as single bundles; or type II, could not be separated. We also observed specimens by focusing on the continuity between the TB and PCT. Fisher's exact test was used to examine the relationship between TB type and AB or PB type.


RESULTS
A TB was identified in all 38 elbows (100%), and continued to the AB in all specimens. No significant relationship was evident between TB type and AB or PB type. Continuity of TB fibers and the PCT was seen in 26 elbows (72%).


CONCLUSION
This study suggested that the morphology of the transverse bundle may be unrelated to the morphology of the anterior bundle or posterior bundle.
['Matsuzawa|Kanta|K|http://orcid.org/0000-0002-0356-2557', 'Edama|Mutsuaki|M|http://orcid.org/0000-0002-2784-6466', 'Otsuki|Tomofumi|T|http://orcid.org/0000-0001-5880-6267', 'Maruyama|Sae|S|http://orcid.org/0000-0002-8632-3489', 'Ikezu|Masahiro|M|', 'Kageyama|Ikuo|I|']
D000369:Aged, 80 and over D002102:Cadaver D000070637:Collateral Ligament, Ulnar D004551:Elbow Joint D005260:Female D006801:Humans D007564:Japan D008297:Male
Ulnar collateral ligament Anatomy Elbow joint Valgus stability