Acetabular posterior wall morphology. A CT-based method to distinguish two acetabular posterior wall types

Tilman Graulich; Pascal Graeff; Stine Nicolaides; Marco Haertle; Mohamed Omar; Christian Krettek; Emmanouil Liodakis

doi:10.1016/j.jor.2020.01.027

Acetabular posterior wall morphology. A CT-based method to distinguish two acetabular posterior wall types

J Orthop. 2020 Jan 26:20:160-166. doi: 10.1016/j.jor.2020.01.027. eCollection 2020 Jul-Aug.

Authors

Tilman Graulich¹, Pascal Graeff¹, Stine Nicolaides¹, Marco Haertle¹, Mohamed Omar¹, Christian Krettek¹, Emmanouil Liodakis¹

Affiliation

¹ Trauma Department, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.

Abstract

Background: The anatomy of the posterior wall of the acetabulum is important for the hip stability. We wanted to know whether differences can be observed.

Material and methods: On lateral 3D pelvic CT reconstruction of the pelvis two types were identified. On axial CT-images acetabular angles were determined.

Results: We observed 35 type I acetabular and 61 type II acetabular. Posterior acetabular sector angle was 114° in type I and 94° in type II acetabular (p < 0.01). At an cut-off angle of 100° we could predict the type of acetabulum.

Conclusions: We could describe reference values for the posterior wall to distinguish two morphological types.

Keywords: Acetabulum; Anteversion acetabular angle; Posterior sector acetabular angle; Posterior wall.