The association between knee torsion and multiple bony dysplasia of the lower extremities in patients with recurrent patellar dislocation
10.3969/j.issn.1000-6710.2025.04.001
- VernacularTitle:复发性髌骨脱位中膝扭转与下肢多重骨性结构不良之间的关联性分析
- Author:
Hui ZHANG
1
;
Daofeng WANG
1
;
Xuesong WANG
1
;
Lei HONG
1
;
Yue LI
1
;
Guan WU
1
;
Yanwei CAO
1
Author Information
1. 首都医科大学附属北京积水潭医院(北京 100035)
- Publication Type:Journal Article
- Keywords:
recurrent patellar dislocation;
knee torsion;
multiple bony abnormalities;
patellar tracking
- From:
Chinese Journal of Sports Medicine
2025;44(4):257-263
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the association between knee torsion and multiple bony abnormali-ties of the lower limb in patients with recurrent patellar dislocation(RPD).Methods The preoperative imaging data of RPD patients treated in our institution between May 2020 and October 2024 were col-lected retrospectively.A total of 238 patients were included in this study,with 83.6%being females.All patients underwent standard hip-knee-ankle CT scans,and lower limb bony structural parameters were reconstructed and measured using Mimics 20.0,focusing on variables such as knee torsion,femo-ral anteversion(FAA),femoral distal torsion angle(DFTA),supratrochlear spur,tibial tuberosity to trochlear groove distance(TT-TG),Caton-Deschamps index,and tibial torsion.Bony abnormalities were categorized based on previously established risk thresholds.Moreover,chi-square tests were em-ployed to compare the composition ratio differences between knee torsion and multiple lower limb osse-ous abnormalities.Results Among all affected knees,the proportion of excessive knee torsion was 33.6%,while in cases with osseous abnormalities,the value was over 40%.Compared with cases of low knee torsion,patients with excessive knee torsion showed significantly higher proportions of FAA(41.3%vs.27.2%,P=0.028),excessive DFTA(60%vs.32.9%,P<0.001),supratrochlear spur(55%vs.38.6%,P=0.016),trochlear dysplasia(93.8%vs.73.4%,P<0.001),excessive TT-TG(68.8%vs.43.7%,P<0.001),and patella alta(50%vs.22.2%,P<0.001).Additionally,95%of knees with excessive torsion exhibited two or more bony risk factors,whereas 55%had four or more bony structural abnormalities,which was significantly higher than those of low knee torsion(55%vs.21.5%,P<0.001).Conclusion In RPD patients,excessive knee torsion is associated with multiple low-er limb bony abnormalities.Moreover,patients with high knee torsion(>12°)are significantly more likely to have multiple bony abnormalities than those with low torsion.Therefore,in surgical decision-making for such patients,lower limb bony abnormalities should be assessed comprehensively.
