Key result
Patellar dislocation in growing rabbits significantly altered the angle of femoral version at 5 months post-surgery compared to control knees (-5.50° vs -10.90°, p=0.001).
Why the study?
Torsional malalignment is considered a risk factor for patellar dislocation, but the influence of patellar dislocation on torsional alignment development remains unknown.
Does patellar lateral dislocation alter hindlimb torsional alignment (femoral version and tibial torsion) in growing rabbits?
Does patellar lateral dislocation alter hindlimb torsional alignment (femoral version and tibial torsion) in growing rabbits?
Absolute Event Rate: -5.5% vs -10.9%
p-value: p=0.001
Early patellar dislocation leads to an abnormal femoral version in growing rabbits, indicating that patellar instability can alter lower extremity torsional alignment during development.
May prompt torsional monitoring after pediatric patellar dislocation; leaves open human relevance.
Background: Torsional 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. Methods: In 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. Results: After 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). Conclusion: From 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.
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Niu et al. (2021) studied Patellar dislocation (n=30). Patellar lateral dislocation surgery vs. No surgical procedure (contralateral right knee) was evaluated on Angle of femoral version at 5 months post-surgery (p=0.001). Patellar dislocation in growing rabbits significantly altered the angle of femoral version at 5 months post-surgery compared to control knees (-5.50° vs -10.90°, p=0.001).
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