Computed tomographic evaluation of elbow congruity during arthroscopy in a canine cadaveric model

O. T. Skinner; C. M. R. Warren-Smith; N. J. Burton; K. J. Parsons

doi:10.3415/VCOT-14-02-0017

Veterinary and Comparative Orthopaedics and Traumatology, Table of Contents

Vet Comp Orthop Traumatol 2015; 28(01): 19-24
DOI: 10.3415/VCOT-14-02-0017

Original Research

Schattauer GmbH

Computed tomographic evaluation of elbow congruity during arthroscopy in a canine cadaveric model

O. T. Skinner

¹Department of Clinical Veterinary Sciences, University of Bristol, Bristol, United Kingdom

,

C. M. R. Warren-Smith

¹Department of Clinical Veterinary Sciences, University of Bristol, Bristol, United Kingdom

,

N. J. Burton

¹Department of Clinical Veterinary Sciences, University of Bristol, Bristol, United Kingdom

,

K. J. Parsons

¹Department of Clinical Veterinary Sciences, University of Bristol, Bristol, United Kingdom

› Author Affiliations

Abstract

Summary

Objective: To assess the effect of arthro-scope insertion, using a carbon-fibre rod model, on humero-radial, humero-ulnar and radio-ulnar congruity, as assessed by computed tomography (CT).

Methods: Cadaveric Greyhound elbow joints were assessed at a flexion angle of 135 ± 5° using CT. For condition 1, a 36 mm fulcrum induced cubital valgus, as used to aid arthro-scope insertion. For conditions 2 and 3, a single 1.8 or 2.5 mm diameter rod was inserted under arthroscopic guidance to simulate arthroscope position for assessment of the medial coronoid process. Repeat CT scans were obtained for all conditions and parasagittal sections were reconstructed to evaluate medial, axial and lateral positions within the elbow. Humero-radial, humeroulnar, and radio-ulnar congruity measurements were obtained. Differences between groups were assessed using repeated measures analysis of variance.

Results: Mean (±SD) change in radio-ulnar step between conditions 1 and 3 was 0.6 ± 0.3 mm (axial), 0.8 ± 0.6 mm (medial), and 0.5 ± 0.1 mm (lateral). Insertion of rods induced a significant decrease in radio-ulnar step in all planes. Significant differences were also identified between groups for humero-radial, humero-ulnar, and radio-ulnar congruity.

Clinical significance: Insertion of carbon-fibre rods as a model for elbow arthroscope insertion induces elbow incongruity. Changes in radio-ulnar congruity are small but the effect of arthroscope diameter should be considered when assessing elbow congruity.

Keywords

Elbow - congruity - arthroscopy - computed tomography - dog

Full Text

References

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