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Published on: September 7, 2022
Randomised controlled trial comparing two methods of acetabular cup positioning during total hip arthroplasty
P A Vendittoli1, M Ganapathi, N Duval
1Orthopaedic Division, Department of Surgery, Maisonneuve-Rosemont Hospital, Montral, Qubec, Canada. pa.vendittoli@videotron.ca; pa_vendittoli@hotmail.com
Summary
An inclinometer did not significantly improve acetabular cup positioning in total hip arthroplasty compared to traditional methods. This suggests further research into advanced techniques like navigation for optimizing cup placement is warranted.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Surgical Techniques
Background:
- Acetabular cup positioning is critical in total hip arthroplasty (THA).
- Current methods rely on surgeons' visual estimation using anatomical landmarks.
- Incorrect abduction angles increase risks of dislocation, wear, and osteolysis.
Purpose of the Study:
- To evaluate the effectiveness of an inclinometer for improving vertical acetabular cup positioning in THA.
- To compare the precision of inclinometer-assisted positioning versus traditional visuospatial perception.
Main Methods:
- A randomized study involving 100 acetabular cups, with half inserted using an inclinometer and half using visuospatial perception.
- Postoperative radiographs were used to measure abduction angles by blinded evaluators.
Main Results:
- 57% of cups were within the desired 40-49° abduction angle with the inclinometer, versus 50% with visuospatial perception (p=0.454).
- The proportion of cups outside the safe 30-55° range was low in both groups (6% vs. 4%, p=0.536).
Conclusions:
- The inclinometer did not significantly enhance acetabular cup abduction angle accuracy compared to visuospatial perception.
- Advanced techniques like surgical navigation may offer better optimization and outlier reduction for cup positioning.
