The patellofemoral morphology and the normal predicted value of tibial tuberosity-trochlear groove distance in the Chinese population

BMC Musculoskeletal Disorders

Zhe Li¹  Guanzhi Liu¹  Ning Kong¹  Yue Li¹  Pei Yang¹  Run Tian¹  Yiyang Li¹  Kunzheng Wang¹ 

[1] Department of Bone and Joint Surgery, The Second Affiliated Hospital of Medical College, Xi’an Jiaotong University, 710004, Xi’an, Shaanxi, People’s Republic of China;

关键词: Patellofemoral joint;    Tibial tuberosity-trochlear groove distance;    Knee morphology;    LASSO regression;   

DOI  :  10.1186/s12891-021-04454-8

来源: Springer

【 摘 要 】

BackgroundOur objective was to obtain normal patellofemoral measurements to analyse sex and individual differences. In addition, the absolute values and indices of tibial tuberosity-trochlear groove (TT-TG) distances are still controversial in clinical application. A better method to enable precise prediction is still needed.MethodsSeventy-eight knees of 78 participants without knee pathologies were included in this cross-sectional study. A CT scan was conducted for all participants and three-dimensional knee models were constructed using Mimics and SolidWorks software. We measured and analysed 19 parameters including the TT-TG distance and dimensions and shapes of the patella, femur, tibia, and trochlea. LASSO regression was used to predict the normal TT-TG distances.ResultsThe dimensional parameters, TT-TG distance, and femoral aspect ratio of the men were significantly larger than those of women (all p values < 0.05). However, after controlling for the bias from age, height, and weight, there were no significant differences in TT-TG distances and anterior-posterior dimensions between the sexes (all p values > 0.05). The Pearson correlation coefficients between the anterior femoral offset and other indexes were consistently below 0.3, indicating no relationship or a weak relationship. Similar results were observed for the sulcus angle and the Wiberg index. Using LASSO regression, we obtained four parameters to predict the TT-TG distance (R2 = 0.5612, p < 0.01) to achieve the optimal accuracy and convenience.ConclusionsNormative data of patellofemoral morphology were provided for the Chinese population. The anterior-posterior dimensions of the women were thicker than those of men for the same medial-lateral dimensions. More attention should be paid to not only sex differences but also individual differences, especially the anterior condyle and trochlea. In addition, this study provided a new method to predict TT-TG distances accurately.

【 授权许可】

CC BY