Association between posterior tibial slope and tibial torsion angle and
recurrent patellar dislocation based on the full-length CT of the lower limbs

YUAN Shuo; BAO Hu-RiCha

doi:10.16098/j.issn.0529-1356.2023.06.012

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Acta Anatomica Sinica ›› 2023, Vol. 54 ›› Issue (6) : 703-709. DOI: 10.16098/j.issn.0529-1356.2023.06.012

Anatomy

Association between posterior tibial slope and tibial torsion angle and recurrent patellar dislocation based on the full-length CT of the lower limbs

YUAN Shuo^1,2ZHAO An-quan^1,2 HUANG Qi-ri-mai-la-tu¹,2 WU Hai-he¹ XU Yong-sheng¹ QI Yan-song^1* BAO Hu-ri-cha^1*

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Abstract

Objective To measure and compare the lateral posterior tibial slope (LPTS), medial posterior tibial slope (MPTS) and tibial torsion angle (TTA) between the patients of recurrent patellar dislocation and the heathy people, and to analyze the correlation between LPTS, MPTS and TTA and the risk factors of recurrent patellar dislocation. Methods A total of 33 patients (44 knees) with recurrent patellar dislocation in our hospital from July 2019 to June 2021 were selected and listed as the study group. Twenty-three subjects (46 knees) who were suspected iliac vascular and lower limb vascular diseases during the same period were selected and listed as the control group. All the enrolled researchers had full-length CT scans date of the lower limbs. Three-dimensional models were reconstructed using Mimics 21.0 software and then imported into 3-matic software. The LPTS, MPTS and TTA were measured and compared between the two groups. Results In the study group, the LPTS, MPTS and TTA were （7.69±1.42）°,（10.06±1.71）°,（36.42±8.13）°, respectively, while the control group, the LPTS, MPTS and TTA were（8.42±1.65）°, （10.44±0.86）°, (25.77±3.90)°, respectively. There were no significant differences in the LPTS, MPTS and TTA between different genders and sides both in the study group and the control group (P>0.05). Compared with the control group, the LPTS in the study group was smaller, and the difference was statistically significant (P<0.05). There was no statistically significant difference between the study group and the control group in the MPTS (P>0.05). Compared with the control group, the TTA in the study group was higher, and the difference was statistically significant (P<0.05). Compared with the control group, the LPTS and MPTS in the study group were significant asymmetry, and the difference was statistically significant (P<0.05). Conclusion The lateral posterior tibial slope of patients with recurrent patellar dislocation is significantly smaller than that in the healthy people, while there is no significant difference in the medial posterior tibial slope; The tibial torsion angle of patients with recurrent patellar dislocation is significantly larger than in the healthy people; The lateral posterior tibial slope and tibial torsion angle have certain correlation with recurrent patellar dislocation, which can conduct the diagnosis of recurrent patellar dislocation.

Key words

Recurrent patellar dislocation / Anatomy / Risk factor / Three-dimensional measurement / Adult

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YUAN Shuo ZHAO An-quan HUANG Qi-ri-mai-la-tu WU Hai-he XU Yong-sheng QI Yan-song BAO Hu-ri-cha.

Association between posterior tibial slope and tibial torsion angle and recurrent patellar dislocation based on the full-length CT of the lower limbs

[J]. Acta Anatomica Sinica. 2023, 54(6): 703-709 https://doi.org/10.16098/j.issn.0529-1356.2023.06.012

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