title: Precision of acetabular cup placement in robotic integrated total hip arthroplasty.
abstract: OBJECTIVE
  The aim of this study was to assess the efficacy of stereotactic-arm assisted acetabular component placement during total hip arthroplasty (THA).
  
  
  METHODS
  120 patients underwent primary THA at 4 different medical centres. A preoperative pelvic CT protocol was used to plan socket placement followed by robotic-arm assisted acetabular preparation and cup insertion. Intraoperative cup position was recorded and postoperative placement measured using Martell suite analysis software.
  
  
  RESULTS
  Using a 95% predictive intervals, robotic-arm cup placement was within +/-4 degrees of planned position in 95% of cases. Applying these data to the so-called safe zone, 96% of sockets were within the defined safe zone. Our data confirms that intraoperative robotic assistance improves the precision of preparation and position of the acetabular cup during total hip arthroplasty.
authors.affiliation: Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts - USA.
authors.forename: Leah
authors.initials: L
authors.lastname: Elson
authors.affiliation: Creekside Medical Center, Naples, Florida - USA.
authors.forename: Jon
authors.initials: J
authors.lastname: Dounchis
authors.affiliation: University of Wisconsin, Madison, Wisconsin - USA.
authors.forename: Richard
authors.initials: R
authors.lastname: Illgen
authors.affiliation: South County Hospital, Wakefield, Rhode Island - USA.
authors.forename: Robert C
authors.initials: RC
authors.lastname: Marchand
authors.affiliation: Hospital for Special Surgery, New York - USA.
authors.forename: Douglas E
authors.initials: DE
authors.lastname: Padgett
authors.affiliation: Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts - USA.
authors.forename: Charles R
authors.initials: CR
authors.lastname: Bragdon
authors.affiliation: Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts - USA.
authors.forename: Henrik
authors.initials: H
authors.lastname: Malchau
mesh_terms: D000077:Acetabulum; D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D007592:Joint Diseases / Q000209:etiology / Q000473:pathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D061646:Operative Time; D015203:Reproducibility of Results; D065287:Robotic Surgical Procedures; D013238:Stereotaxic Techniques