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J Wrist Surg 2019; 08(02): 124-131
DOI: 10.1055/s-0038-1676865
Scientific Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Carpal Kinematics following Sequential Scapholunate Ligament Sectioning

Clare E. Padmore
1   Bioengineering Research Laboratory, Roth McFarlane Hand and Upper Limb Centre, St. Joseph's Health Care London, London, Ontario, Canada
2   The University of Western Ontario, London, Ontario, Canada
,
Helen Stoesser
1   Bioengineering Research Laboratory, Roth McFarlane Hand and Upper Limb Centre, St. Joseph's Health Care London, London, Ontario, Canada
2   The University of Western Ontario, London, Ontario, Canada
,
G. Daniel G. Langohr
1   Bioengineering Research Laboratory, Roth McFarlane Hand and Upper Limb Centre, St. Joseph's Health Care London, London, Ontario, Canada
2   The University of Western Ontario, London, Ontario, Canada
,
James A. Johnson
1   Bioengineering Research Laboratory, Roth McFarlane Hand and Upper Limb Centre, St. Joseph's Health Care London, London, Ontario, Canada
2   The University of Western Ontario, London, Ontario, Canada
,
Nina Suh
1   Bioengineering Research Laboratory, Roth McFarlane Hand and Upper Limb Centre, St. Joseph's Health Care London, London, Ontario, Canada
2   The University of Western Ontario, London, Ontario, Canada
› Author Affiliations
Funding Dr. Johnson reports grants from the Canadian Institutes of Health Research Program Grant during the conduct of the study.
Further Information

Publication History

07 February 2018

12 November 2018

Publication Date:
17 January 2019 (online)

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Abstract

Background The scapholunate ligament (SLL) is the most commonly injured intercarpal ligament of the wrist. It is the primary stabilizer of the scapholunate (SL) joint, but the scaphotrapeziotrapezoid (STT) and radioscaphocapitate (RSC) ligaments may also contribute to SL stability. The contributions of SL joint stabilizers have been reported previously; however, this study aims to examine their contributions to SL stability using a different methodology than previous studies.

Purpose The purpose of this in vitro biomechanical study was to quantify changes in SL kinematics during wrist flexion and extension following a previously untested sequential sectioning series of the SL ligament and secondary stabilizers.

Methods Eight cadaveric upper extremities underwent active wrist flexion and extension in a custom motion wrist simulator. SL kinematics were captured with respect to the distal radius. A five-stage sequential sectioning protocol was performed, with data analyzed from 45-degree wrist flexion to 45-degree wrist extension.

Results Wrist flexion and extension caused the lunate to adopt a more extended posture following sectioning of the SLL and secondary stabilizers compared with the intact state (p < 0.009). The isolated disruption to the dorsal portion of the SLL did not result in significant change in lunate kinematics compared with the intact state (p > 0.05). Scaphoid kinematics were altered in wrist flexion following sequential sectioning (p = 0.013). Additionally, disruption of the primary and secondary stabilizers caused significant change to SL motion in both wrist flexion and wrist extension (p < 0.03).

Conclusions The SLL is the primary stabilizer of the SL articulation, with the STT and RSC ligaments playing secondary stabilization roles.

Clinical Relevance Understanding the role primary and secondary SL joint stabilizers may assist in the development of more effective treatment strategies and patient outcomes following SLL injuries.

Keywords

scapholunate instability - wrist - biomechanics

All work was performed at the Hand and Upper Limb Clinic, London, Ontario.