title: Validating a Modified Circle Theorem Method for the Measurement of Acetabular Cup Anteversion on Plain Radiography with Intra-Operative Data from Robotic Assisted Total Hip Arthroplasty.
abstract: This study aims to validate a modified circle theorem method for the calculation of true version of the acetabular component on anteroposterior x-rays with intra-operative version data derived from robotic assisted total hip arthroplasty (THA). Planar anteversion measurements recorded intraoperatively in 80 THAs were correlated to measurements on anteroposterior radiographs. The mean anteversion of the cohort measured by the robotic system and on plain radiography was 21.2° ± 2.0° and 19.9° ± 3.4° respectively and 97.5% of cases were in a 30% relative error. The correlation between the true and planar measurements of anteversion on plain radiographs was strong (Pearson correlation coefficient of 0.9422). We conclude that the circle theorem method can be validated with data from robotic guided THA.
authors: Department of Orthopaedics, University of Illinois at Chicago, Chicago, Illinois.
authors: Farid
authors: F
authors: Amirouche
authors: Department of Orthopaedics, University of Illinois at Chicago, Chicago, Illinois.
authors: Giovanni F
authors: GF
authors: Solitro
authors: Advocate Health Care, Downers Grove, Illinois.
authors: Siva
authors: S
authors: Chandrasekaran
authors: Stritch School of Medicine, Loyola University, Chicago, Illinois.
authors: Benjamin G
authors: BG
authors: Domb
authors: Department of Orthopaedics, University of Illinois at Chicago, Chicago, Illinois.
authors: Mark H
authors: MH
authors: Gonzalez
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000601:surgery*; D000328:Adult; D000368:Aged; D000465:Algorithms; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation / Q000379:methods*; D015331:Cohort Studies; D005260:Female; D005269:Femur / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010027:Osteotomy; D010388:Pelvis / Q000473:pathology; D015203:Reproducibility of Results; D065287:Robotic Surgical Procedures; D014057:Tomography, X-Ray Computed / Q000379:methods*; D016896:Treatment Outcome
keywords: combined anteversion; hip anteversion; planar anteversion; robotic surgery; true anteversion