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Changes of acetabular anteversion according to pelvic tilt on sagittal plane under various acetabular inclinations
Author(s) -
Song Suk Kyoon,
Choi Won Kee,
Jung Suk Han,
Kim Hee Chan,
Kim Tae Hoon,
Cho Myung Rae
Publication year - 2021
Publication title -
journal of orthopaedic research®
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.24790
Subject(s) - pelvic tilt , coronal plane , sagittal plane , radiography , inclination angle , tilt (camera) , orthodontics , medicine , pelvis , anatomy , mathematics , radiology , geometry
Improper functional orientation of the acetabular cup can result in improper positions when dynamic pelvic positions are not considered. The purpose of this study was to evaluate changes on acetabular anteversion according to pelvic tilt under various acetabular inclinations. Two artificial pelvic models were selected for this study. Acetabular inclinations on the coronal plane were 25°, 32°, 50°, and 60°. Acetabular anteversion of all components were 15°. Changes of anteversion according to pelvic tilt were measured at angles of 0°, 10°, 20°, 30°, and 40°. Computer Navigation, PolyWare 3D pro, CT, and plain radiography were used to measure each angle. The anatomical anteversions against pelvic tilt were calculated using the following formulae: anatomical anteversion (°) = −14.48Χ + 90.18 (inclination angle 25°); anatomical anteversion (°) = −12.26Χ + 80.10 (inclination angle 32°); anatomical anteversion (°) = −7.468Χ + 61.13 (inclination angle 50°); and anatomical anteversion (°) = −5.328Χ + 44.84 (inclination angle 60°) (Χ: pelvic tilt angle). Radiographic anteversion against pelvic tilt were calculated using the following formulae: radiographic anteversion (°) = −9.50Χ + 57.09 (inclination angle 25°); radiographic anteversion (°) = −8.577Χ + 50.89 (inclination angle 32°); radiographic anteversion (°) = −6.794Χ + 45.73 (inclination angle 50°); radiographic anteversion (°) = −5.226Χ + 33.08 (inclination angle 60°). In conclusion, changes in anteversion according to pelvic tilt were lesser at higher degrees of acetabular inclination.