The definition and measurement of acetabular orientation

TLDR

The orientation of an acetabulum or prosthesis is described by inclination and anteversion, which can be assessed anatomically, radiographically, or directly during surgery, and the angles differ across these methods, producing three distinct definitions. This paper analyses the differences between the definitions. It provides nomograms to convert from one definition to another. The authors recommend using operative definitions for prostheses and anatomical definitions for dysplastic acetabula.

Abstract

The orientation of an acetabulum or an acetabular prosthesis may be described by its inclination and anteversion. Orientation can be assessed anatomically, radiographically, and by direct observation at operation. The angles of inclination and anteversion determined by these three methods differ because they have different spatial arrangements. There are therefore three distinct definitions of inclination and anteversion. This paper analyses the differences between the definitions and provides nomograms to convert from one to another. It is recommended that the operative definitions be used to describe the orientation of prostheses and that the anatomical definitions be used for dysplastic acetabula.