title: Roles of Sagittal Anatomical Parameters of the Pelvis in Primary Total Hip Replacement for Patients with Ankylosing Spondylitis.
abstract: We examined the correlation between acetabular prostheses and sagittal anatomical parameters of the pelvis for the preoperative evaluation of total hip arthroplasty in 29 patients with ankylosing spondylitis between April 2004 and November 2011. No implant dislocation or subsidence was observed at 4.18 years. The relationship between sagittal parameters conformed to the equation Pelvic incidence (PI)=Pelvic tilt (PT)+Sacral slope (SS). Better outcomes were achieved in the SS>PT group, postoperative function was positively correlated with SS/PI. Functional abduction and anteversion were positively correlated with PT but negatively correlated with SS. Due to the compensatory changes in the pelvis and spine of patients with AS, the preoperative assessment of sagittal parameters plays pivotal roles in placing acetabular prostheses in optimal positions and preventing postoperative impingement and dislocation.
authors.affiliation: Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
authors.forename: Minghui
authors.initials: M
authors.lastname: Gu
authors.affiliation: Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
authors.forename: Zhiqi
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Kang
authors.affiliation: Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
authors.forename: Puyi
authors.initials: P
authors.lastname: Sheng
authors.affiliation: Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
authors.forename: Zibo
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
authors.forename: Ziji
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
authors.forename: Weiming
authors.initials: W
authors.lastname: Liao
mesh_terms: D000328:Adult; D019644:Arthroplasty, Replacement, Hip; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010388:Pelvis / Q000033:anatomy & histology*; D011184:Postoperative Period; D012189:Retrospective Studies; D012447:Sacrum / Q000033:anatomy & histology; D013167:Spondylitis, Ankylosing / Q000601:surgery*; D055815:Young Adult
keywords: ankylosing spondylitis; pelvic incidence; pelvic tilt; sacral slope; total hip arthroplasty