Key result
Experimental patellar dislocation in growing rabbits significantly altered 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 remained unknown.
Does patellar dislocation alter the torsional alignment of the hindlimb in growing rabbits?
Does patellar dislocation alter the torsional alignment of the hindlimb in growing rabbits?
Absolute Event Rate: -5.5% vs -10.9%
p-value: p=0.001
Patellar dislocation leads to significant alteration of femoral version in growing rabbits, suggesting early treatment in children may be important to avoid future torsional malalignment.
This is the authors' abstract. We don't add key points for this paper.
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 torsion alteration of the hindlimb occur after patellar dislocation in growing rabbits. Methods In the present study, 30 one-month old rabbits were included. The experimental group consists of 30 left knees of rabbits and were underwent patellar lateral dislocation. And the control group consists of 30 right knees and no surgical procedure was performed. The Computed Tomography (CT) scan was performed on each knee when the surgery was finished and at the time 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 control group. Results The femoral version and tibia torsion in the experimental and control group immediately after surgery were not significantly different. However, 5 months after surgery, the femoral version angle of the experimental group (-5.50±6.13°) was significantly different with that of the experimental group (-10.90±4.74°)( P < 0.05). But the tibia torsion angle 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. This may indicate the early treatment for patellar dislocation in children is particularly important to avoid torsional malalignment in the future. These findings may develop pathology and etiology of patellar dislocation.
Patellar dislocation effects on rabbit hindlimb torsion warrant clinical caution; leaves open relevance to human pediatric alignment.
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Niu et al. (2020) studied Patellar dislocation (n=30). Patellar lateral dislocation surgery vs. No surgical procedure (contralateral right knee) was evaluated on Femoral version angle at 5 months post-surgery (p=0.001). Experimental patellar dislocation in growing rabbits significantly altered femoral version at 5 months post-surgery compared to control knees (-5.50° vs -10.90°, p=0.001).
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