title: Digital templating in total hip arthroplasty: Additional anteroposterior hip view increases the accuracy.
abstract: OBJECTIVE
  To analyze planning total hip arthroplasty (THA) with an additional anteroposterior hip view may increases the accuracy of preoperative planning in THA.
  
  
  METHODS
  We conducted prospective digital planning in 100 consecutive patients: 50 of these procedures were planned using pelvic overview only (first group), and the other 50 procedures were planned using pelvic overview plus antero-posterior (a.p.) hip view (second group). The planning and the procedure of each patient were performed exclusively by the senior surgeon. Fifty procedures with retrospective analogues planning were used as the control group (group zero). After the procedure, the planning was compared with the eventually implanted components (cup and stem). For statistic analysis the χ2test was used for nominal variables and thettest was used for a comparison of continuous variables.
  
  
  RESULTS
  Preoperative planning with an additional a.p. hip view (second group) significantly increased the exact component correlation when compared to pelvic overview only (first group) for both the acetabular cup and the femoral stem (76% cup and 66% stemvs54% cup and 32% stem). When considering planning ± 1 size, the accuracy in the second group was 96% (48 of 50 patients) for the cup and 94% for the stem (47 of 50 patients). In the analogue control group (group zero), an exact correlation was observed in only 1/3 of the cases.
  
  
  CONCLUSIONS
  Digital THA planning performed by the operating surgeon and based on additional a.p. hip view significantly increases the correlation between preoperative planning and eventual implant sizes.
authors.affiliation: Sophia K Stigler, Franz J Müller, Sebastian Pfaud, Michael Zellner, Bernd Füchtmeier, Clinic for Trauma, Orthopaedic and Sports Medicine, Hospital Barmherzige Brüder, 93049 Regensburg, Germany.
authors.forename: Sophia K
authors.initials: SK
authors.lastname: Stigler
authors.affiliation: Sophia K Stigler, Franz J Müller, Sebastian Pfaud, Michael Zellner, Bernd Füchtmeier, Clinic for Trauma, Orthopaedic and Sports Medicine, Hospital Barmherzige Brüder, 93049 Regensburg, Germany.
authors.forename: Franz J
authors.initials: FJ
authors.lastname: Müller
authors.affiliation: Sophia K Stigler, Franz J Müller, Sebastian Pfaud, Michael Zellner, Bernd Füchtmeier, Clinic for Trauma, Orthopaedic and Sports Medicine, Hospital Barmherzige Brüder, 93049 Regensburg, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Pfaud
authors.affiliation: Sophia K Stigler, Franz J Müller, Sebastian Pfaud, Michael Zellner, Bernd Füchtmeier, Clinic for Trauma, Orthopaedic and Sports Medicine, Hospital Barmherzige Brüder, 93049 Regensburg, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Zellner
authors.affiliation: Sophia K Stigler, Franz J Müller, Sebastian Pfaud, Michael Zellner, Bernd Füchtmeier, Clinic for Trauma, Orthopaedic and Sports Medicine, Hospital Barmherzige Brüder, 93049 Regensburg, Germany.
authors.forename: Bernd
authors.initials: B
authors.lastname: Füchtmeier
keywords: Digital; Hip view; Preoperative planning; Templating; Total hip arthroplasty