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Vet Comp Orthop Traumatol 2021; 34(06): 386-393
DOI: 10.1055/s-0041-1731811
Original Research

Relation of Computed Tomography-Based Static Axial Radioulnar Incongruence Measurements under General Anaesthesia and Dynamic, In Vivo RUI during the Walk in Canine Elbow Joints with and without Medial Coronoid Process Disease

Thomas Rohwedder
1   Small Animal Clinic, Freie University, Berlin, Germany
,
Peter Böttcher
1   Small Animal Clinic, Freie University, Berlin, Germany
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Abstract

Objective This study aimed to evaluate the correlation of static axial radioulnar incongruence (sRUI) measured under general anaesthesia with the real in vivo dynamic RUI (dRUI) during walking.

Study Design This was a prospective clinical study that included 6 sound elbows (5 dogs) and 7 medial coronoid process disease (MCPD) affected elbows (6 dogs).

Materials and Methods Static axial radioulnar incongruence was measured using the sphere fitting technique on computed tomography-based three-dimensional (3D) models of radius and ulna. The in vivo pose of radius and ulna was derived from radiostereometric analysis during the walk and transferred onto previously calculated 3D models. Dynamic RUI was measured on those adjusted models using the sphere fitting technique, providing a measurement of RUI over time during walk.

Results Mean sRUI was 0.2 mm (standard deviation [SD]: 0.30) in control and 1.4 mm (SD: 0.73) in elbow joints with MCPD; being significantly different (p = 0.0035; confidence interval [CI]: 0.4772–1.8824). Mean dRUI in controls (−0.4 mm; SD: 0.47) was significantly different (p = 0.0004; CI: 0.9918–2.5225) from dRUI in the affected elbows (1.4 mm; SD: 0.73). Comparison of sRUI and dRUI within each group showed difference in the control group (0.2 vs. −0.4 mm; p = 0.0138; CI: 0.1820–1.0014). In affected elbows, no difference between sRUI and dRUI was found (1.4 vs. 1.4 mm; p = 0.8963).

Conclusion In normal elbow joints, sRUI does not represent the in vivo condition during weight bearing. Dynamic and slightly negative RUI occurs during loading (0.2 mm positive to −0.4 mm negative RUI). In MCPD affected elbows with sRUI, no dynamic change of RUI occurs during the walk.

Keywords

elbow - joint biomechanics - kinematics - pathology of joints - radiostereometric analysis

Authors' Contributions

Thomas Rohwedder and Peter Bottcher were involved in the conception of study, study design, acquisition of data and data analysis and interpretation. Thomas Rohwedder was also involved in drafting or revising of manuscript.


Note

This study was presented in part at the ACVS Surgical Symposium, October 6–8, 2016, Seattle, Washington, USA.




Publication History

Received: 29 June 2020

Accepted: 08 June 2021

Article published online:
03 August 2021

© 2021. Thieme. All rights reserved.

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany

 

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