• Dr. Domb!

    Thanks a lot for getting my hip right. Looking forward to a full recovery and a great season. Thanks again for everything.

    Corey WoottonChicago Bears and Detroit Lions
  • Thank you for all that you have done for me and the team. My hip feels so much better, and because of you I'm pain free.
    Sylvia Fowles WNBA Finals MVP, 2-time Olympic Gold Medalist
  • Thank you for working your magic! You're the best!
    Zakiya BywatersChicago Red Stars, National Women's Soccer League
  • Thanks for all the love and positive Energy that was put into my surgery. May the Lord bless you and your family.
    Atari BigbyGreen Bay Packers and San Diego Chargers
  • Dr. Domb, Thanks for fixing me up
    Rashied DavisChicago Bears
  • Huge thank you to Dr. Domb for always taking care of me and getting me back on the court in no time!
    Elena Delle DonneChicago Sky, MVP of the WNBA
  • Dr. Domb! Thanks for taking care of the hip! All the best to you and your staff
    Roosevelt ColvinChicago Bears' All-Decade Defense team
  • Thanks doc for fixing my hip!
    Ryan ChiaveriniWindy City Live Co-Host on ABC7

2015- Domb et al. 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

Farid Amirouche, PhD a, Giovanni F. Solitro, PhD a, Siva Chandrasekaran, MD b, Benjamin G. Domb, MD c, MarkH. Gonzalez, MDa

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 o  2.0o and 19.9o  3.4o 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.

Acetabular cup position affects stability, range of motion and impingement in total hip arthroplasty (THA) [1]. Inclination and anteversion are the two most commonly analyzed parameters of cup positioning [2]. Lewinnek et al proposed a safe zone for acetabular inclination of 1510o to minimize dislocation rates [3].More recently, Dorr et al defined a safe zone for combined anteversion of the acetabulum and femur of 25o to 50o [4]. Following on fromthis, Nakashima et al demonstrated that THAswith a combined anteversion (Fig. 1) outside of the range of 40o to 60owere 5.8 timesmore likely to dislocate than those within this range [5].

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