Relative Contributions of the Ulnar Attachments of the Triangular Fibrocartilage Complex to the Dynamic Stability of the Distal Radioulnar Joint
| Autor: | Toshiyasu Nakamura, Lawrence J. Berglund, Kai Nan An, Patricia G. Neale, Richard A. Berger, Jan Ragnar Haugstvedt |
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| Rok vydání: | 2006 |
| Předmět: |
Joint Instability
Triangular Fibrocartilage Wrist Joint Druj Ulna Wrist Supination Weight-Bearing Cadaver Foveal medicine Humans Pronation Orthopedics and Sports Medicine Muscle Skeletal Aged Orthodontics business.industry Anatomy Radius medicine.anatomical_structure Ligament Surgery Cadaveric spasm business Triangular Fibrocartilage Complex |
| Zdroj: | The Journal of Hand Surgery. 31:445-451 |
| ISSN: | 0363-5023 |
| DOI: | 10.1016/j.jhsa.2005.11.008 |
| Popis: | Purpose Laboratory studies evaluating the importance of the stabilizing structures of the distal radioulnar joint (DRUJ) largely have been limited to static design. Clinically, dynamic loading seems to be an important component of DRUJ instability. This study was designed to evaluate the influence of dynamic loading on the stability of the DRUJ with foveal versus styloid triangular fibrocartilage complex (TFCC) disruptions in a laboratory setting. Methods Twelve fresh-frozen cadaveric upper-extremity specimens were tested using a dynamic simulator to study the contributions of the 2 ulnar insertions of the TFCC to the dynamic stability of the DRUJ. The specimens were tested in 3 loading conditions (no load, agonist loading, antagonist loading) in 3 different states of the TFCC (intact, foveal disruption, styloid disruption). Results Without load no significant differences were found for the different conditions of the TFCC. Under loaded conditions the foveal insertion had a greater effect on stability than did the styloid insertion. Under agonist loading significant differences were found during supinating and pronating motions. With antagonist loading a significant difference was found only during supination. Conclusions The study results support the clinical impression that dynamic loading is an important component of DRUJ instability and that disruption of the foveal TFCC insertion into the foveal region of the distal ulna can produce instability. |
| Databáze: | OpenAIRE |
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