title: Pelvic tilt in patients undergoing total hip arthroplasty: when does it matter?
abstract: Pelvic tilt (PT) affects the functional anteversion and inclination of acetabular components in total hip arthroplasty (THA). One-hundred and thirty-eight consecutive patients who underwent unilateral primary THA were reviewed. Most cases had some degree of pre-operative PT, with 17% having greater than 10° of PT on standing pre-operative radiographs. There was no significant change in PT following THA. A computer model of a hemispheric acetabular component implanted in a range of anatomic positions in a pelvis with varying PT was created to determine the effects of PT on functional anteversion and inclination. Based on the study results, tilt-adjustment of the acetabular component position based on standing pre-operative imaging will likely improve functional component position in most patients undergoing THA.
authors.affiliation: Hospital for Special Surgery, New York, NY.
authors.forename: Joseph D
authors.initials: JD
authors.lastname: Maratt
authors.affiliation: Hospital for Special Surgery, New York, NY.
authors.forename: Christina I
authors.initials: CI
authors.lastname: Esposito
authors.affiliation: Hospital for Special Surgery, New York, NY.
authors.forename: Alexander S
authors.initials: AS
authors.lastname: McLawhorn
authors.affiliation: Hospital for Special Surgery, New York, NY.
authors.forename: Seth A
authors.initials: SA
authors.lastname: Jerabek
authors.affiliation: Hospital for Special Surgery, New York, NY.
authors.forename: Douglas E
authors.initials: DE
authors.lastname: Padgett
authors.affiliation: Hospital for Special Surgery, New York, NY.
authors.forename: David J
authors.initials: DJ
authors.lastname: Mayman
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000601:surgery*; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D060750:Bone Anteversion; D017760:Bone Malalignment / Q000000981:diagnostic imaging / Q000517:prevention & control*; D003198:Computer Simulation; D005260:Female; D006621:Hip Joint / Q000000981:diagnostic imaging* / Q000503:physiopathology / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010384:Pelvic Bones / Q000000981:diagnostic imaging* / Q000503:physiopathology; D011859:Radiography; D016059:Range of Motion, Articular
keywords: computer-assisted surgery; cup orientation; hip arthroplasty; navigation; preoperative planning