This work was performed in the Comparative Orthopaedics and Biomechanics Laboratory, University of Florida.
Original Article - Research
Ex vivo Contact Mechanics and Three-Dimensional Alignment of Normal Dog Elbows after Proximal Ulnar Rotational Osteotomy
Article first published online: 30 NOV 2012
© Copyright 2012 by The American College of Veterinary Surgeons
Volume 41, Issue 8, pages 905–914, November 2012
How to Cite
Cuddy, L. C., Lewis, D. D., Kim, S. E., Conrad, B. P., Banks, S. A., Horodyski, M., Fitzpatrick, N. and Pozzi, A. (2012), Ex vivo Contact Mechanics and Three-Dimensional Alignment of Normal Dog Elbows after Proximal Ulnar Rotational Osteotomy. Veterinary Surgery, 41: 905–914. doi: 10.1111/j.1532-950X.2012.01038.x
Funding provided by a University of Florida College of Veterinary Medicine Faculty Consolidated Research Grant, and by Fitzpatrick Referrals, Eashing, UK.
Presented in part at the Veterinary Arthrology Advancement Association Annual Symposium and Laboratory, Naples, FL, August 2011, and at the American College of Veterinary Surgeons Annual Symposium, Chicago, IL, November 2011.
Recipient of the Veterinary Arthrology Advancement Association Resident Award, 2011. First Place Research Presentation, Small Animal Resident's Forum, American College of Veterinary Surgeons Annual Symposium, Chicago, IL, November 2011.
- Issue published online: 30 NOV 2012
- Article first published online: 30 NOV 2012
- Manuscript Accepted: JUL 2012
- Manuscript Received: APR 2012
- University of Florida College of Veterinary Medicine Faculty Consolidated Research Grant
To evaluate the effect of proximal ulnar rotational osteotomy (PURO) on the contact mechanics and 3-dimensional (3D) alignment of cadaveric normal dog elbows.
Ex vivo biomechanical study.
Unpaired thoracic limbs from 12 dogs (mean ± SD weight, 26 ± 4 kg).
PURO consisted of a transverse osteotomy with 30° external rotation of the proximal segment. With the limb under 200 N axial load, contact area (CA), mean contact pressure (CP) and peak contact pressure (PCP) were measured using digital pressure sensors in the medial and lateral compartments and 3D static elbow poses were obtained, before and after PURO. Each specimen was tested at 115°, 135°, and 155° elbow flexion, with the antebrachium in neutral rotation, in 28° supination, and in 16° pronation. Repeated measures ANOVAs with post-hoc Bonferroni (P ≤ .05) were performed.
PURO caused significant changes, mostly at 135° elbow flexion and neutral antebrachial rotation, characterized by decreased CP (10%) and PCP (10%) in the medial compartment, and increased CP (27%) and PCP (23%) in the lateral compartment. The apex of the medial coronoid process translated 3.4 mm caudally, 1.7 mm abaxially, and rotated 1.8° externally relative to the radial head. Humeroradial varus angulation reduced by 6.7°.
In limited poses, PURO displaces the medial coronoid process caudally and abaxially and shifts contact pressures towards the lateral elbow compartment by decreasing varus angulation.