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Accuracy of knee implants sizing predicted by digital images.
Siwadol Wongsak1, Viroj Kawinwonggowit, Pornchai Mulpruck
1Department of Orthopaedics, Faculty of Medicine Ramathibodi Hospital, Mahidol Universit, Bangkok, Thailand. siwadolrama@hotmail.com
Summary
Digital templating for knee replacement surgery shows moderate accuracy in predicting implant size. While direct accuracy was limited, the method reliably predicted sizes within one option, aiding surgeon planning and anticipation.
Area of Science:
- Orthopedic Surgery
- Medical Imaging
- Biomechanical Engineering
Background:
- Accurate preoperative templating is crucial for precise and reproducible total knee arthroplasty (TKA).
- Digital templating using knee implants on digital radiographs offers a method for preoperative planning in TKA.
Purpose of the Study:
- To evaluate the accuracy of knee implant sizes predicted by digital templating.
- To assess the reliability of digital preoperative planning for TKA components.
Main Methods:
- A retrospective study analyzed 100 Thai adults with knee osteoarthritis.
- Digital anteroposterior and lateral knee radiographs were used for measurements and implant selection.
- Predicted implant sizes were compared against actual intraoperative implant sizes.
Main Results:
- Digital preoperative plans showed 53.1% accuracy for femoral components and 59.3% for tibial components.
- The planning accurately predicted 97.6% of femoral implants and 95.1% of tibial implants within one size.
- Interobserver and intraobserver reliability were assessed using correlation coefficients.
Conclusions:
- Digital templating aids in focusing surgical plans and identifying potential size extremes or mismatches.
- Early recognition of size discrepancies allows for intraoperative accommodation or selection of alternative implant systems.
- Predicting implant sizes within one size range enhances surgeon anticipation and planning efficiency.