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
1   Department of Clinical Veterinary Sciences, University of Bristol, Bristol, United Kingdom
,
C. M. R. Warren-Smith
1   Department of Clinical Veterinary Sciences, University of Bristol, Bristol, United Kingdom
,
N. J. Burton
1   Department of Clinical Veterinary Sciences, University of Bristol, Bristol, United Kingdom
,
K. J. Parsons
1   Department of Clinical Veterinary Sciences, University of Bristol, Bristol, United Kingdom
› Author Affiliations
Further Information

Publication History

Received:01 February 2014

Accepted:04 November 2014

Publication Date:
26 December 2017 (online)

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.

 
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