Biomechanical analysis of simultaneous distal and proximal radio-ulnar joint instability

Simultaneous dislocation of the proximal and distal radio-ulnar joints without bony injuries has been reported, but the mechanism remains unclear. We investigated concurrent proximal and distal radio-ulnar joint instability after sequential sectioning of the annular ligament, triangular fibrocartila...

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Bibliographic Details
Published in:Clinical biomechanics (Bristol) 2020-08, Vol.78, p.105074-105074, Article 105074
Main Authors: Hayami, Naoki, Omokawa, Shohei, Kira, Tsutomu, Hojo, Junya, Mahakkanukrauh, Pasuk, Tanaka, Yasuhito
Format: Article
Language:English
Subjects:
Adult
Biomechanical Phenomena
Biomechanics
Cadaver
Distal radio-ulnar joint
Female
Humans
Joint Instability - physiopathology
Joint Instability - surgery
Ligaments, Articular - physiopathology
Ligaments, Articular - surgery
Male
Mechanical Phenomena
Middle Aged
Pronation
Proximal radio-ulnar joint
Radius - physiopathology
Radius - surgery
Rotation
Simultaneous radio-ulnar joint instability
Supination
Ulna - physiopathology
Ulna - surgery
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Summary:Simultaneous dislocation of the proximal and distal radio-ulnar joints without bony injuries has been reported, but the mechanism remains unclear. We investigated concurrent proximal and distal radio-ulnar joint instability after sequential sectioning of the annular ligament, triangular fibrocartilage complex, and quadrate ligament. We performed this biomechanical study with six fresh-frozen cadaveric upper extremities. Proximal and distal radio-ulnar joint displacement was measured using an electromagnetic tracking device during passive mobility testing with anterior, lateral, and posterior loads on the radial head with pronation, supination, and neutral rotation. Measurements were statistically analyzed using the generalized linear mixed model. Proximal radio-ulnar joint instability was significantly greater after sectioning of the annular (lateral: 1.4%, P 
ISSN:0268-0033
1879-1271
DOI:10.1016/j.clinbiomech.2020.105074