In Vitro Comparison Study of Four Surgical Techniques Used in Open Reduction of Hip Dislocations in the Dog

Cardoso, Jose Manuel da Mota (1994) In Vitro Comparison Study of Four Surgical Techniques Used in Open Reduction of Hip Dislocations in the Dog. MVM(R) thesis, University of Glasgow.

Abstract

This dissertation includes a broad literature review on coxofemoral dislocations in small animals, with particular emphasis on the canine patient. It begins with an anatomic description of the hip joint. The aetiology, classification, biomechanics and incidence of the disease are referenced. The pathology, clinical features and diagnosis are also presented. A chapter dealing with treatment develops references of both closed and open reduction (including the surgical approaches), as well as the postoperative management. The literature review concludes with a chapter on the prognosis of each mode of treatment. The aim of this project was to compare the lateral resistance to reluxation, in cadaver material, between a control group, consisting of the normal hip dissected of all soft tissues other than the intact joint capsule and teres ligament, and four surgical methods of stabilization: (i) Capsulorrhaphy; (ii) Transarticular pin; (iii) Dorsal capsular prosthesis; (iv) Toggle pin. Any one of the above techniques was used on the contralateral dissected hip which was dislocated by a circumferential incision of the joint capsule and transection of the teres ligament. The hypothesis of the project was that techniques that are very successful clinically, differ in resistance and some have considerably lower resistance than the normal intact supporting soft tissue structures of the joint. Twenty skeletally mature cadavers of dogs, free from osteoarthritic changes to the hip joint, were used in this study, making up for forty specimens: 10 control specimens of the right hip, 10 control of the left hip, and 5 for each of the surgical groups. The specimens were tested for peak load at failure using a Instron testing machine, model 4505, which ran, using a series IX cyclic testing software, at a constant rate of displacement of 10 mm / min. and recording a sampling rate of 10 points / second. A load displacement curve was computer generated for each specimen. Failure was defined as occurring when a peak load was followed by a drop of over 20%. The mode of failure was recorded for each specimen. A statistical analysis of variance (one-way ANOVA) was used to compare the results of peak load at failure between the: (i) Four surgical groups; (ii) Four surgical groups and the control group; (iii) Control group of the right hip and the control group of the left hip. Differences with a probability value <0.05 were considered statistically significant. Transarticular pinning was considered significantly weaker than the other three surgical techniques. The combined control group (right and left hip) was considered significantly stronger than the mean value for the four surgical techniques. There were no significant differences between the control groups of the right and left hips.

• Item Type: Thesis (MVM(R))
• Qualification Level: Masters
• Additional Information: Adviser: Andrew Miller
• Keywords: Veterinary science, Animal sciences
• Date of Award: 1994
• Depositing User: Enlighten Team
• Unique ID: glathesis:1994-75812
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 19 Dec 2019 09:15
• Last Modified: 19 Dec 2019 09:15
• URI: https://theses.gla.ac.uk/id/eprint/75812