A new digital preoperative planning method for total hip arthroplasties

H.J.A. Crooijmans, A.M.R.P. Laumen, C. van Pul, J.B.A. van Mourik

Research output: Contribution to journalArticleAcademicpeer-review

45 Citations (Scopus)
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Preoperative templating is an important part of a THA. The ability to accurately determine magnification of the hip on the radiograph and apply identical magnification to the radiograph and template will improve accuracy of preoperative templating of THA. We designed a templating method using a new way of determining the hip magnification with a linear relationship between magnification of the hip and the reference object on top of the pubis symphysis; the relationship was determined on 50 radiographs. We then compared our method with two other templating methods: an analog method assuming an average hip magnification of 15% and a digital method determining the hip magnification with a one-to-one relationship between the reference object and the hip. All methods were reproducible. Uniform undersizing occurred when templating with the digital method based on the one-to-one relationship; the analog method best predicted the implanted prosthesis size, closely followed by our new digital templating method; the new method will be particularly applicable for preoperative THA when analog methods are replaced by digital methods.

Original languageEnglish
Pages (from-to)909-916
Number of pages8
JournalClinical Orthopaedics and Related Research
Issue number4
Publication statusPublished - Apr 2009


  • Aged
  • Aged, 80 and over
  • Arthroplasty, Replacement, Hip
  • Bone Cements
  • Cementation
  • Female
  • Hip Joint
  • Hip Prosthesis
  • Humans
  • Male
  • Middle Aged
  • Planning Techniques
  • Preoperative Care
  • Prosthesis Fitting
  • Radiographic Image Interpretation, Computer-Assisted
  • Reproducibility of Results

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