The purpose of this study was to assess the ability of digital templating software to accurately predict implant size requirements for primary total hip arthroplasty.
Methods:
  • 135* consecutive primary total hip arthroplasties were templated preoperatively using the TraumaCadTM templating software (Orthocrat Ltd, Israel).
  • Hips were templated using magnification-calibrated radiographs. For each hip, an AP pelvis, AP and false profile projection were used for the preoperative assessment.
  • All acetabuli implanted were either Trilogy Trabecular Metal (Zimmer), Trident PSL (Stryker), or Pinnacle (DePuy) implants.
  • Femoral stems were either Alloclassic or ML-Taper (Zimmer), Accolade or Exeter (Stryker), or Corail (DePuy).
  • All hips were implanted by a single surgeon using either a MIS posterior or modified MIS Watson-Jones approach.
  • Postoperatively, the predicted implant size was compared to the actual components selected at the time of surgery.


Conclusions:

  • Surgeon’s ability to anticipate intraoperative needs is critical to success.
  • Digital X-Ray imaging has necessitated a change in the way preoperative templatingis performed.
  • Digital preoperative templating for hip arthroplasty enables this need.
  • The TraumaCad™ application proved highly accurate and reliable, predicting exact component size in >70% of cases, within 1 size in >95% of cases, and within 2 sizes in 100% of cases.
  • Intraoperative restoration of leg-lengths was highly reproducible and accurate, achieving a postoperative difference less than 5 mm in 89% of cases.
  • This accuracy transcended the multiple implant designs employed.
  • It is likely that this technology (using magnification-calibrated images) enables more precise prediction of intraoperative needs when compared to the traditional film-based techniques (that relied upon estimations of magnification).
  • To our knowledge, this is the largest series of digitally-templated hip arthroplasties reported. 

For more details visit the poster - http://www.orthocrat.com/PDF/Kantor_poster.pdf

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