Jnl Wrist Surg 2019; 08(01): 010-017
DOI: 10.1055/s-0038-1667303
Scientific Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

The Effect of Dorsal Angulation on Distal Radioulnar Joint Arthrokinematics Measured Using Intercartilage Distance

Braden Gammon
1  Division of Orthopedics, The Ottawa Hospital, University of Ottawa, Ottawa, Ontario, Canada
,
Emily Lalone
2  Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario, Canada
,
Masao Nishiwaki
3  Department of Orthopaedic Surgery, Kawasaki Municipal Hospital, Kawasaki-ku, Kawasaki, Japan
,
Ryan Willing
2  Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario, Canada
,
James Johnson
4  Department of Mechanical and Materials Engineering, Lawson Health Research Institute, London, Ontario, Canada
,
Graham J. W. King
5  Division of Orthopedic Surgery, Roth McFarlane Hand and Upper Limb Centre, St. Joseph's Health Care, London, Ontario, Canada
› Author Affiliations
Further Information

Publication History

14 March 2018

15 June 2018

Publication Date:
15 August 2018 (online)

Abstract

Background The effects of dorsal angulation deformity on in vitro distal radioulnar joint (DRUJ) contact patterns are not well understood.

Purpose The purpose of this study was to utilize intercartilage distance to examine the effects of forearm rotation angle, distal radius deformity, and triangular fibrocartilage complex (TFCC) sectioning on DRUJ contact area and centroid position.

Methods An adjustable implant permitted the creation of simulated intact state and dorsal angulation deformities of 10, 20, and 30 degrees. Three-dimensional cartilage models of the distal radius and ulna were created using computed tomography data. Using optically tracked motion data, the relative position of the cartilage models was rendered and used to measure DRUJ cartilage contact mechanics.

Results DRUJ contact area was highest between 10 and 30 degrees of supination. TFCC sectioning caused a significant decrease in contact area with a mean reduction of 11 ± 7 mm2 between the TFCC intact and sectioned conditions across all variables. The position of the contact centroid moved volarly and proximally with supination for all variables. Deformity had a significant effect on the location of the contact centroid along the volar–dorsal plane.

Conclusion Contact area in the DRUJ was maximal between 10 and 30 degrees of supination during the conditions tested. There was a significant effect of simulated TFCC rupture on contact area in the DRUJ, with a mean contact reduction of 11 ± 7 mm2 after sectioning. Increasing dorsal angulation caused the contact centroid to move progressively more volar in the sigmoid notch.

Note

This research was performed in the Hand and Upper Limb Center Biomechanics Laboratory, Lawson Health Research Institute.