Does functional planning, 3D templating and patient-specific instrumentation improve accuracy in total hip...

Area of Science:

• Orthopedic surgery
• Biomedical engineering
• Radiology

Background:

• Optimal acetabular component orientation in total hip arthroplasty (THA) remains debated.
• Accurate placement is crucial for long-term implant success and patient function.
• Current techniques, including 2D templating, have limitations in achieving precise orientation.

Purpose of the Study:

• To compare the accuracy of CT-based planning with patient-specific instruments (Corin Optimized Positioning System - OPS) against conventional 2D templating for acetabular component placement in THA.
• To evaluate the reliability of achieving planned acetabular anteversion using both techniques.

Main Methods:

• A single-center, randomized controlled trial involving 54 patients undergoing THA.
• Patients were randomized to either the OPS group (3D planning, patient-specific guides) or the conventional group (2D templating).
• Postoperative CT scans were used to measure the primary outcome: mean error in acetabular anteversion.

Main Results:

• No statistically significant difference in the mean error of acetabular anteversion between the OPS and conventional THA groups.
• The OPS group achieved planned acetabular anteversion within 10° in 96% of cases, versus 76% in the conventional group.
• Clinical outcomes were comparable between the two groups.

Conclusions:

• CT-based planning and patient-specific instruments may reduce large errors in acetabular orientation compared to standard techniques.
• While a higher percentage of cases in the OPS group were within 10° of the planned anteversion, the overall mean error difference was not statistically significant.
• Further research may be needed to fully elucidate the benefits of advanced planning techniques in THA.