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Effect of Sequential Removal of Parts of the Second Metacarpal Bone on the Biomechanical Stability of the Equine Carpus
Author(s) -
Seabaugh Kathryn A.,
Hubert Jeremy D.,
Kawcak Christopher E.,
McGilvray Kirk C.,
Santoni Brandon G.,
Rao Sangeeta,
Baxter Gary M.
Publication year - 2012
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/j.1532-950x.2012.01011.x
Subject(s) - cadaveric spasm , medicine , carpal bones , biomechanics , stiffness , carpal joint , torsion (gastropod) , anatomy , cadaver , metacarpal bones , orthodontics , compression (physics) , wrist , materials science , composite material
Objective To quantify changes in biomechanical stability and stiffness within the equine carpus after removal of 50%, 80%, and 100% of the second metacarpal bone ( MC 2). Study Design In vitro biomechanical study. Methods Cadaveric equine forelimbs (n = 16) were evaluated. Intact constructs were loaded in axial compression from 0 to 5000 N and compression + torsion (5000 N ± 20°) for 5 cycles. This was repeated after removal of 50%, 80%, and 100% of MC 2. The primary biomechanical outcome variables were the compressive stiffness and compressive + torsional stiffness of the carpus. Relative kinematic motion was also evaluated between the second carpal bone ( C 2) and the radial carpal bone ( RC ), C 2 and the third metacarpal bone ( MC 3) and C 2 and the third carpal bone ( C 3). Results A significant decrease in compressive + torsional stiffness was found after 100% removal of MC 2. Compressive stiffness of the carpus did not change after 100% MC 2 removal. A significant increase in relative rotation around the z‐axis (rotation around the long axis) was observed for C 2 versus MC 3 and C 2 versus C 3 when 100% of MC 2 was removed as compared to 80%, 50%, and 0% removal. No significant difference in relative rotation between C 2 and RC was detected. Conclusions The biomechanical results reported here suggest that the torsional stability of the equine carpus is significantly decreased only after complete resection of MC 2.