Abstract
BackgroundTorsional malalignment has been considered as a risk factor for patellar dislocation. But the influence of patellar dislocation for torsional alignment development remains unknown. The present study aims to investigate whether the torsional alteration of the hindlimb occurs after patellar dislocation in growing rabbits.MethodsIn the present study, 30 one-month-old rabbits were included. The experimental group consisted of 30 left knees of rabbits which underwent patellar lateral dislocation. The control group consisted of 30 right knees of the rabbits which no surgical procedure was performed. The Computed Tomography (CT) scan was performed after the surgery and at the point the rabbits were skeletal mature (5 months post-surgery). The angles of femoral version and tibial torsion were measured using a three-dimensional method and analyzed between the experimental group and the control group.ResultsAfter the surgery, the femoral version and tibial torsion in the experimental and control group were not significantly different. However, 5 months after surgery, the angle of femoral version in the experimental group (-5.50 ± 6.13°) was significantly different from that in the control group (−10.90 ± 4.74°) (P < 0.05). But the angle of tibial torsion in the experimental group (7.17 ± 7.25°) and control group (4.47 ± 6.34°) were not significantly different (P = 0.144).ConclusionsFrom this study, patellar dislocation can lead to alteration of femoral version in growing rabbits. So patellar dislocation may affect on lower extremity alignment. These findings may develop pathology and etiology of patellar dislocation.
Highlights
Torsional malalignment has been considered as a risk factor for patellar dislocation
Several anatomic factors are associated with patellar dislocation, including increased tibial tubercle–trochlear groove (TT-TG) distance, patella alta, rotational deformities, trochlear dysplasia,and patella shape [1,2,3,4,5,6]
Two rabbits died of postoperative infection in one week after surgery
Summary
Torsional malalignment has been considered as a risk factor for patellar dislocation. Several anatomic factors are associated with patellar dislocation, including increased tibial tubercle–trochlear groove (TT-TG) distance, patella alta, rotational deformities, trochlear dysplasia,and patella shape [1,2,3,4,5,6]. Kaymaz found trochlea flattening after surgery for creating patella alta in growing rabbits [11] These studies indicated that the dysplasia of patella or femoral trochlea could be caused by an abnormal patellar position. In another animal study [12], tibial tubercle lateralization and tibial tuberosity–trochlear groove distance (TT-TG) increased after patellar dislocation
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