Three-dimensional Measurement And Analysis Of Tibial Torsion Angle In Patients With Patellofemoral Instability

Objective:The difference between tibial torsion angle and healthy people in patients with patellofemoral joint instability was measured and analyzed,the correlation between tibial torsion angle and knee function and TT-TG value in patients with patellofemoral joint instability was studied,and the etiology of patellofemoral instability was explored,which provided a reference for the diagnosis of patellofemoral instability and related diseases and the selection of treatment options.Methods:A total of 30 patients with patellofemoral instability who visited the Department of Orthopedic and Joint Surgery and Sports Medicine of our hospital in a total of 24 months from November 2020 to November 2022 were selected as the research subjects,and the above patients were included as experimental groups.During the same period,30 healthy volunteers independently recruited by our hospital were selected as the control group.Collect all researchers’ knee and ankle CT scan data and import it into Mimics software in Dicom format to build a 3D model,measure the angle of tibial torsion,and analyze the correlation between tibial torsion angle and TT-TG value and knee function after measuring TT-TG value.Results:(1)The tibial torsion angle of the experimental group(patients with patellofemoral joint instability)was(31.75±4.92)°,and the control group(healthy volunteers)was(24.08±5.82)°,and the comparison difference was statistically significant(P<0.05).(2)The experimental group was divided according to the size of the tibial torsion angle(less than 35° for mild group,23 cases;After statistical analysis,there was no significant difference in TT-TG values between the two groups(P>0.05),and there were significant differences in tibial torsion angle,Kujala score and Lysholm score between the two groups(P<0.05).(3)There was no significant correlation between the tibial torsion angle and TT-TG value in the experimental group(P>0.05),but it was negatively correlated with Kujala score and Lysholm score.Conclusion:Increased tibial torsion angle is a risk factor for patellofemoral instability,and patients with patellofemoral instability have a larger tibial torsion angle than healthy people,but there is no significant correlation with TT-TG value.An abnormally enlarged tibial torsion angle can affect knee function,and the larger the angle,the worse the knee function.