A new digital preoperative planning method for total hip arthroplasties

Area of Science:

• Orthopedic surgery
• Radiology
• Medical imaging analysis

Background:

• Accurate preoperative templating is essential for successful total hip arthroplasty (THA).
• Current digital templating methods may not fully account for radiographic magnification, potentially impacting accuracy.
• Improving magnification assessment is key to enhancing THA preoperative planning.

Purpose of the Study:

• To develop and evaluate a novel digital preoperative templating method for THA.
• To accurately determine hip radiographic magnification using a linear relationship with a reference object.
• To compare the accuracy of the new digital method against traditional analog and a basic digital method.

Main Methods:

• A new digital templating method was designed, establishing a linear relationship between hip magnification and a reference object (pubis symphysis).
• This relationship was determined using 50 hip radiographs.
• The new method was compared to an analog method (15% magnification assumption) and a basic digital method (1:1 relationship).

Main Results:

• All tested templating methods demonstrated reproducibility.
• The basic digital method (1:1 relationship) resulted in consistent undersizing of implants.
• The analog method provided the most accurate prediction of implanted prosthesis size, closely followed by the new digital method.

Conclusions:

• The developed digital templating method offers improved accuracy for preoperative THA planning.
• This new method is particularly relevant for the transition from analog to digital preoperative templating.
• Accurate magnification assessment is critical for optimizing implant sizing in total hip arthroplasty.