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Abstract

Objective

To investigate effects of the use of stance time or velocity as control variables on ground reaction forces in lame dogs.

Animals

12 dogs with pelvic osteotomies.

Procedure

Data for ground reaction forces were obtained preoperatively and at 2, 4, 6, 8, 12, 16, 20, 24, and 28 weeks postoperatively, using velocity and stance time as control variables. Ground reaction forces obtained were compared between the 2 methods of data collection, as were velocities and stance times of the trials.

Results

Significant differences in ground reaction forces were not found between the use of velocity or stance time as a control variable at any time. Also, significant differences in stance times or velocities were not found between the 2 methods of data collection. Greatest variation in stance time and velocity was found during periods of greatest lameness.

Conclusions and Clinical Relevance

Use of stance time as a control variable in force plate analysis does not lead to significantly different results from use of velocity as a control variable, indicating that either method may be used in force plate analysis of dogs. (Am J Vet Res 1999;60:814–819)

Free access
in American Journal of Veterinary Research

Abstract

Objective—To evaluate a method for experimental induction of osteoarthritis in the hip joints of dogs.

Animals—12 mixed-breed dogs.

Procedure—A unilateral triple pelvic osteotomy was performed. In 6 dogs, the iliac osteotomy was repaired with 45° of internal rotation, reducing coverage of the femoral head by the acetabulum. In the other 6 dogs, the fragments were repaired in anatomic alignment. Radiography, force plate evaluations, and subjective lameness evaluations were performed before and after surgery. Dogs were euthanatized 7 months after surgery, and samples of cartilage and joint capsule were examined histologically.

Results—Subjective lameness scores, radiographic appearance of the hip joints, and Norberg angles were not significantly different between groups; however, force plate evaluations did reveal significant differences in vertical ground reaction forces. Femoral head coverage was significantly decreased with rotation of the acetabulum. Mild inflammatory changes were discernible in the joint capsule and articular cartilage of some dogs in both groups.

Conclusions and Clinical Relevance—Results suggest that 45° internal rotation of the acetabulum does not consistently induce biologically important osteoarthritic changes in the hip joints of dogs. (Am J Vet Res 2000;61:484–491)

Full access
in American Journal of Veterinary Research