Murray's 1993 paper confronts a fundamental source of confusion in hip surgery: the terms 'inclination' and 'anteversion' mean different things depending on how you measure them. The paper precisely defines three distinct measurement systems — anatomical, radiographic, and operative — derives the mathematics connecting them, and builds nomograms for conversion.
When reviewing literature or comparing acetabular measurements, recognize that inclination and anteversion values depend entirely on which definition system was used. Use operative definitions when describing cup positioning and anatomical definitions when evaluating hip dysplasia.
Murray's 1993 paper confronts a fundamental source of confusion in hip surgery: the terms 'inclination' and 'anteversion' mean different things depending on how you measure them. The paper precisely defines three distinct measurement systems — anatomical, radiographic, and operative — derives the mathematics connecting them, and builds nomograms for conversion.
When reviewing literature or comparing acetabular measurements, recognize that inclination and anteversion values depend entirely on which definition system was used. Use operative definitions when describing cup positioning and anatomical definitions when evaluating hip dysplasia.