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J Hand Ther. 2013 Oct-Dec;26(4):312-7; quiz 317. doi: 10.1016/j.jht.2013.07.003. Epub 2013 Sep 12.

Role of the extensor carpi ulnaris in the stabilization of the lunotriquetral joint. An experimental study.

Author information

1
(a)Department of Orthopaedics, Hospital Ca'n Misses, Eivissa, Spain.

Abstract

STUDY DESIGN:

Experimental laboratory-based research in biomechanics.

INTRODUCTION:

The mechanisms by which some lunotriquetral (LTq) ligament disruptions remain stable are not known.

PURPOSE OF THE STUDY:

To investigate the contribution of muscles in preventing carpal destabilization when the LTq ligaments are torn.

METHODS:

Ten fresh cadaver wrists, set vertical in a jig, were isometrically loaded through five wrist motor tendons. Changes in carpal alignment secondary to the application of loads were monitored by a Fastrak™ electromagnetic motion tracking device, before and after sectioning the LTq ligaments.

RESULTS:

After LTq ligaments sectioning, wrist loading forced the triquetrum into flexion (5.4° average) and supination (2.9 ). The only muscle capable of extending and pronating the collapsed triquetrum was the extensor carpi ulnaris (ECU).

CONCLUSIONS:

Inadequate ECU muscle function is an important destabilizing factor in LTq deficient wrists. Dynamic LTq instabilities may benefit from proprioceptionally training the ECU muscle, while avoiding carpal supination torques.

KEYWORDS:

Carpal kinetics; Extensor carpi ulnaris; Lunotriquetral joint; Muscle control; Wrist instability

PMID:
24035668
DOI:
10.1016/j.jht.2013.07.003
[Indexed for MEDLINE]

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