Onur Gürsan1, Ahmet Emrah Açan2, Ali Asma1, Onur Hapa1

1Department of Orthopedics and Traumatology, Faculty of Medicine Dokuz Eylül University, Izmir, Turkey
2Department of Orthopedics and Traumatology, Faculty of Medicine Muğla Sıtkı Koçman University, Muğla, Turkey

Keywords: Acetabular anteversion angle, alpha angle, axial plane coverage, femoroacetabular impingement, hip dysplasia, labral tear


Objectives: This study aims to determine if there is an axial plane coverage insufficiency in patients with symptomatic labral tears compared to the contralateral asymptomatic side and healthy control subjects.

Patients and methods: This retrospective study was conducted between December 2017 and January 2019. Thirty patients (21 males, 9 females; mean age 28 years; range, 20 to 36 years) operated due to unilateral symptomatic acetabular labral tears secondary to femoroacetabular impingement were evaluated. Twenty asymptomatic patients (13 males, 7 females; mean age 27±9 years; range, 19 to 36 years) were included in the control group. The relationship between acetabular morphology and labral tear was investigated with the comparison of unilateral symptomatic hips with contralateral asymptomatic hips and the control group by using radiological parameters on plain radiographs and computed tomography.

Results: When the patient group symptomatic side was compared to the control group, acetabular anteversion angle (A A A) and alpha (a) angle were higher, while posterior acetabular sector angle and horizontal acetabular sector angle were lower. When the asymptomatic side was compared to the control group, AAA was higher in the patient group. There was no difference between the symptomatic and asymptomatic sides in the patient group; the symptomatic side yielded a higher α angle.

Conclusion: Posterior axial plane coverage deficiency in combination with cam deformity (increased a angle) seems to play a role in the pathogenesis of symptomatic acetabular labral tears, even creating a side-to-side difference in some individuals.

Citation: Gürsan O, Açan AE, Asma A, Hapa O. Labral tears with axial plane disorders. Jt Dis Relat Surg 2020;31(1):109-114.

Conflict of Interest

The authors declared no conflicts of interest with respect to the authorship and/or publication of this article.

Financial Disclosure

The authors received no financial support for the research and/or authorship of this article.