The popliteal surface axis may define hip anteversion
Alp Akman1, Ahmet Fahir Demirkan1, Nuran Sabir Akkoyunlu2, Ali Çağdaş Yörükoğlu1
1Department of Orthopedics and Traumatology, Pamukkale University Faculty of Medicine, Denizli, Turkey
2Department of Radiology, Medical Faculty of Pamukkale University, Denizli, Turkey
Keywords: Anteversion, femur, human, popliteal surface axis, posterior condylar axis, trans-epicondylar axis, three-dimensional modelling
Objectives: This study aims to investigate the usability and reliability of our new axis in a three-dimensional modelling work and demonstrate if it is a reproducible method for anteversion measurement that sufficiently correlates with other computed tomography (CT)-derived gold standards including trans- epicondylar axis (TEA) and posterior condylar axis (PCA).
Patients and methods: Three-dimensional solid models were derived from left femoral CT data of 100 participants (50 males, 50 females; mean age 57 years; range, 21 to 86). The newly proposed popliteal surface axis (PSA) was compared with TEA and PCA in terms of anteversion measurement on these solid models.
Results: Popliteal surface axis was found as a reproducible reference axis in our study as it could be measured in 99% of our sample. The mean value of PSA based anteversion was (-) 1.8° which was 10.7° and 4.4° for PCA and TEA, respectively. Popliteal surface axis was perfectly correlated with PCA and TEA for anteversion measurements (p<0.001, r=0.92 for both).
Conclusion: Our findings suggest that the newly defined PSA may be used as an alternative method for determination of anteversion.
Citation: Akman A, Demirkan AF, Sabir Akkoyunlu N, Yörükoğlu AÇ. The popliteal surface axis may define hip anteversion. Jt Dis Relat Surg 2020;31(1):28-33.
The authors declared no conflicts of interest with respect to the authorship and/or publication of this article.
The authors received no financial support for the research and/or authorship of this article.