Mattia Loppini1, Umile Giuseppe Longo2, Pasquala Ragucci3, Nicoletta Trenti3, Luca Balzarini3, Guido Grappiolo1. 1. Department of Orthopaedics and Trauma Surgery, Hip Diseases and Joint Replacement Surgery Unit, Humanitas Research Hospital, Rozzano, Milan, Italy. 2. Department of Orthopaedics and Trauma Surgery, Campus Bio-Medico University, Rome, Italy. 3. Department of Radiology, Humanitas Research Hospital, Rozzano, Milan, Italy.
Abstract
BACKGROUND: We investigated the relationship between pelvic incidence (PI) with anterior pelvic plane angle (APPA), pelvic tilt (PT) angle, and sacral slope (SS) in standing and sitting positions to identify the best parameter expressing the pelvic functional orientation in the sagittal plane. METHODS: We enrolled 109 consecutive patients (M:F = 43:66) eligible for a primary total hip arthroplasty (THA) with an average age of 63.4 years (15-85). EOS 2D/3D radiography was performed in standing and sitting positions before THA to evaluate the functional pelvic orientation. 3D images took into account the patient-specific sagittal balance measuring APPA, PT, SS, and PI. RESULTS: In standing position, functional parameters measured 5° ± 7.1 for APPA, 11° ± 8.3 for PT, 43° ± 8.5 for SS, and 53° ± 10.9 for PI. In sitting position, they were -18° ± 10.4 for APPA, 34° ± 11.8 for PT, 20° ± 12.6 for SS, and 54° ± 10.9 for PI. There was no significant difference between men and women in terms of the functional parameters in both positions. No relationship was found between APPA and PI in both positions. SS correlated with PI in standing (r = 0.66; P < .0001; R2 = 0.44) and sitting (r = 0.51; P < .0001; R2 = 0.26). PT correlated with PI in standing (r = 0.65; P < .0001; R2 = 0.42) and sitting (r = 0.38; P < .0001; R2 = 0.14). CONCLUSION: SS shows the highest correlation with functional pelvic tilt. The study suggests that adjustments in acetabular anteversion during primary THA should be based on SS.
BACKGROUND: We investigated the relationship between pelvic incidence (PI) with anterior pelvic plane angle (APPA), pelvic tilt (PT) angle, and sacral slope (SS) in standing and sitting positions to identify the best parameter expressing the pelvic functional orientation in the sagittal plane. METHODS: We enrolled 109 consecutive patients (M:F = 43:66) eligible for a primary total hip arthroplasty (THA) with an average age of 63.4 years (15-85). EOS 2D/3D radiography was performed in standing and sitting positions before THA to evaluate the functional pelvic orientation. 3D images took into account the patient-specific sagittal balance measuring APPA, PT, SS, and PI. RESULTS: In standing position, functional parameters measured 5° ± 7.1 for APPA, 11° ± 8.3 for PT, 43° ± 8.5 for SS, and 53° ± 10.9 for PI. In sitting position, they were -18° ± 10.4 for APPA, 34° ± 11.8 for PT, 20° ± 12.6 for SS, and 54° ± 10.9 for PI. There was no significant difference between men and women in terms of the functional parameters in both positions. No relationship was found between APPA and PI in both positions. SS correlated with PI in standing (r = 0.66; P < .0001; R2 = 0.44) and sitting (r = 0.51; P < .0001; R2 = 0.26). PT correlated with PI in standing (r = 0.65; P < .0001; R2 = 0.42) and sitting (r = 0.38; P < .0001; R2 = 0.14). CONCLUSION:SS shows the highest correlation with functional pelvic tilt. The study suggests that adjustments in acetabular anteversion during primary THA should be based on SS.
Authors: Peter K Sculco; Timothy Wright; Michael-Alexander Malahias; Alexander Gu; Mathias Bostrom; Fares Haddad; Seth Jerabek; Michael Bolognesi; Thomas Fehring; Alejandro Gonzalez DellaValle; William Jiranek; William Walter; Wayne Paprosky; Donald Garbuz; Thomas Sculco Journal: HSS J Date: 2021-09-28
Authors: Luigi Zagra; Francesco Benazzo; Dante Dallari; Francesco Falez; Giuseppe Solarino; Rocco D'Apolito; Claudio Carlo Castelli Journal: EFORT Open Rev Date: 2022-01-11