Femoral trochlear dysplasia after patellar dislocation in rabbits
Introduction
There are no reports assessing patellar dislocation and development of trochlear groove in children. In this study, an immature rabbit model of lateral patellar dislocation was established to investigate any anatomic morphological changes and histological changes in the femoral trochlea following patellar dislocation.
Section snippets
Animal grouping and model establishment
Eighty knees from forty healthy, one-month-old New Zealand white male and female rabbits, weighing from 290 g to 320 g (provided by Animal Test Center of Hebei Medical University) were divided into three groups (sham surgery, experimental, control). Twenty of the left knees were in the sham surgery group and the other twenty in the experimental group. The forty right knees were in the control group, in which no surgical procedures were applied.
The rabbits were raised under the same conditions in
CT scans
CT scans were conducted in all three groups at time zero and one month and six months after surgery (Fig. 1). Average sulcus angle one month after surgery was 114° ± 2° in all three groups. There was no statistically significant difference in average sulcus angle between the three groups one month after surgery (p > 0.05). Average sulcus angle six months after surgery was 135° ± 2°, 159° ± 4° and 136° ± 2° in the sham surgery, experimental and control groups, respectively. There was a statistically
Discussion
The incidence of femoral trochlear dysplasia is very high in patients with patellar dislocation. Femoral trochlear dysplasia was first presented in 1964 by Brattstrom [5] and it was defined as anatomical morphological abnormality in the geometrical concave and its depth at the trochlear groove. As mentioned, trochlear dysplasia is a predisposing factor for recurrent patellar instability [1], [2], [3], [4], [5], [6]. Schottle et al. [7] reported that femoral trochlear dysplasia is the most
Conflicts of interest
The authors have no conflicts of interest to declare in relation to this article.
Acknowledgments
The authors would like to thank Xiaoqian Men and Jia Chang, who provided expertise at academic meetings, and Yang Ding and Chenghai Wang for their very helpful technical assistance.
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First author at: Department of Orthopaedic Surgery, 1st Central Hospital of Baoding, No. 320, Changcheng Street, Baoding, 071000, Hebei, People's Republic of China.