Changes of ligament lengths at wrist hyperextension in vivo
10.3760/cma.j.issn.1671-7600.2012.04.008
- VernacularTitle:腕关节极度过伸位时韧带长度变化的活体研究
- Author:
Jing CHEN
;
Jun TAN
;
Jinbo TANG
- Publication Type:Journal Article
- Keywords:
Carpal joints;
Ligaments;
In vitro
- From:
Chinese Journal of Orthopaedic Trauma
2012;14(4):313-317
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate changes of ligament lengths with the wrist at the neutral and hyperextended positions in vivo. Methods Six volunteers were enrolled in this study.Their wrists were held in 3 controlled positions:the neutral position of the carpus,hyperextension with radial deviation of 0° and hyperextension with radial deviation of 10°.We obtained computed tomography scans of the wrists at the 3 positions for each subject for 3-dimensional reconstruction of the carpal and distal radioulnar joint with customized softvare (Mimics 10.0).A total of 9 palmar and dorsal wrist ligaments were measured for the length changes. Results Lengths of the radioscaphocapitate (RSC),long radiolunate (LRL),radioscapholunate (RSL),ulnocapitate (UC),ulnolunate (UL),ulnotriquetral (UT) ligaments,and the dorsal intercarpal (DIC) inserting on the scaphoid ligament at the position of hyperextension with radial deviation of 0° were significantly longer than those at the neutral position ( P ＜ 0.05) while lengths of the dorsal-radiocarpal (DRC) ligament and the DIG ligament inserting on the trapezoid decreased significantly ( P ＜0.05).From 0°to 10° of wrist radial deviation in hyperextension,the UL,RSC,LRL,DIG inserting on the scaphoid and the trapezoid ligaments decreased significantly in length ( P ＜ 0.05),while UT,UC,RSL and DRC ligaments lengthened significantly (P ＜0.05). Conclusions The RSL,UC and UT ligaments are subjected to higher strain at the position of hyperextension with wrist radial deviation of 10°; the RSC,LRL,UL ligaments and dorsal DIC ligament inserting on the scaphoid are subjected to higher strains at the position of hyperextension; the DRC ligament at the neutral position and the DIC ligament inserting on the trapezoid when the wrist is extended are subjected to less tension.Thses findings will help understand the mechanism and range of the injury to the wrist ligaments.
