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Variance in predicted cup size by 2-dimensional vs 3-dimensional computerized tomography-based templating in primary
Feroz A Osmani1, Savyasachi Thakkar1, Austin Ramme1
1Department of Orthopaedic Surgery, NYU Langone Medical Center, Hospital for Joint Disease, New York, NY, USA.
Arthroplasty Today
|December 6, 2017
Summary
3D CT-guided templating accurately predicts hip implant cup size, unlike 2D methods. This 3D approach offers improved precision for total hip arthroplasty, potentially preserving bone stock.
Area of Science:
- Orthopedic surgery
- Medical imaging
- Arthroplasty
Background:
- Preoperative total hip arthroplasty templating uses radiographs (acetate prints, digital software) or CT images.
- Current methods may lack precision in predicting implant size.
Purpose of the Study:
- To compare the accuracy of 3D CT-guided templating versus 2D methods (acetate prints, digital software) for predicting hip implant cup size.
Main Methods:
- 45 patients undergoing robotic-assisted total hip arthroplasty were analyzed.
- Cup sizes were templated using acetate prints, digital software (OrthoView), and CT-based software (MAKOplasty).
- Kappa analysis, t-tests, and ICC were used to compare templating accuracy and reliability.
Main Results:
- CT-guided templating showed high agreement (Kappa 0.974) with final cup size.
- Digital and acetate templating significantly overpredicted cup size (P < .001).
- No significant difference in accuracy was found between digital and acetate templating.
Conclusions:
- CT-guided templating is more accurate for predicting hip implant cup size than 2D methods.
- Improved accuracy may lead to better outcomes through bone stock preservation.
