title: Cup Implant Planning Based on 2-D/3-D Radiographic Pelvis Reconstruction-First Clinical Results.
abstract: OBJECTIVE
  In the following, we will present a newly developed X-ray calibration phantom and its integration for 2-D/3-D pelvis reconstruction and subsequent automatic cup planning. Two different planning strategies were applied and evaluated with clinical data.
  
  
  METHODS
  Two different cup planning methods were investigated: The first planning strategy is based on a combined pelvis and cup statistical atlas. Thereby, the pelvis part of the combined atlas is matched to the reconstructed pelvis model, resulting in an optimized cup planning. The second planning strategy analyzes the morphology of the reconstructed pelvis model to determine the best fitting cup implant.
  
  
  RESULTS
  The first planning strategy was compared to 3-D CT-based planning. Digitally reconstructed radiographs of THA patients with differently severe pathologies were used to evaluate the accuracy of predicting the cup size and position. Within a discrepancy of one cup size, the size was correctly identified in 100% of the cases for Crowe type I datasets and in 77.8% of the cases for Crowe type II, III, and IV datasets. The second planning strategy was analyzed with respect to the eventually implanted cup size. In seven patients, the estimated cup diameter was correct within one cup size, while the estimation for the remaining five patients differed by two cup sizes.
  
  
  CONCLUSIONS
  While both planning strategies showed the same prediction rate with a discrepancy of one cup size (87.5%), the prediction of the exact cup size was increased for the statistical atlas-based strategy (56%) in contrast to the anatomically driven approach (37.5%).
  
  
  CONCLUSIONS
  The proposed approach demonstrated the clinical validity of using 2-D/3-D reconstruction technique for cup planning.
authors.forename: Steffen
authors.initials: S
authors.lastname: Schumann
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Sato
authors.forename: Yuki
authors.initials: Y
authors.lastname: Nakanishi
authors.forename: Futoshi
authors.initials: F
authors.lastname: Yokota
authors.forename: Masaki
authors.initials: M
authors.lastname: Takao
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Sugano
authors.forename: Guoyan
authors.initials: G
authors.lastname: Zheng
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008297:Male; D008875:Middle Aged; D010388:Pelvis / Q000000981:diagnostic imaging*; D019047:Phantoms, Imaging; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods*; D055815:Young Adult