Spontaneous recovery of experimental valgus deformity in lambs

P. Meynaud-Collard; E. Asimus; D. Mathon; R. Darmana; P. Frayssinet; J.-Ph. Cahuzac; A. Autefage

doi:10.3415/VCOT-08-07-0064

Veterinary and Comparative Orthopaedics and Traumatology, Table of Contents

Vet Comp Orthop Traumatol 2009; 22(05): 356-362
DOI: 10.3415/VCOT-08-07-0064

Original Research

Schattauer GmbH

Spontaneous recovery of experimental valgus deformity in lambs

Authors

P. Meynaud-Collard

¹Université de Toulouse, Ecole Nationale Vétérinaire de Toulouse, Laboratoire de Chirurgie Expérimentale du Tissu Osseux et Cartilagineux, Unité de Chirurgie, Toulouse Cedex, France
E. Asimus

¹Université de Toulouse, Ecole Nationale Vétérinaire de Toulouse, Laboratoire de Chirurgie Expérimentale du Tissu Osseux et Cartilagineux, Unité de Chirurgie, Toulouse Cedex, France
D. Mathon

¹Université de Toulouse, Ecole Nationale Vétérinaire de Toulouse, Laboratoire de Chirurgie Expérimentale du Tissu Osseux et Cartilagineux, Unité de Chirurgie, Toulouse Cedex, France
R. Darmana

²INSERM U825, CHU Purpan, Toulouse Cedex 3, France
P. Frayssinet

³Urodelia SA, Le Gaillard, Route de Saint Thomas, Saint Lys, France
J.-Ph. Cahuzac

⁴Hôpital des enfants, Toulouse cedex 9, France
A. Autefage

¹Université de Toulouse, Ecole Nationale Vétérinaire de Toulouse, Laboratoire de Chirurgie Expérimentale du Tissu Osseux et Cartilagineux, Unité de Chirurgie, Toulouse Cedex, France

Abstract

Summary

Introduction: Angular deformity in the growing skeleton of animals, especially in the radius and ulna, is occasionally seen in clinical practice. The mechanism of spontaneous correction of these angular deformities however remains to be elucidated. The purpose of our experiment was to explore the ability of a growth plate to correct an induced valgus deformity, and to study the mechanism of correction.

Methods: Before beginning the study, valgus deformity of the distal radius had been induced in lambs by the application of a device that causes asymmetrical compression of the growth plate. The study began after removal of the device and spontaneous correction of the induced deformity was observed weekly for 20 weeks. The angles of the deformity and longitudinal growth on the medial and lateral portions of the growth plate were respectively measured on craniocaudal and mediolateral radiographs.

Results and conclusions: Spontaneous correction of the valgus deformity occurred during the first 16 weeks. It resulted from asymmetrical growth characterised by restricted activity of the medial portion of the growth plate (14.8%) in comparison to the lateral portion of the experimental radius, and also in comparison to the medial portion of the control radius.

Keywords

Growth plate - induced valgus deformity - spontaneous correction

Full Text

References

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