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Improving acetabular cup orientation in total hip arthroplasty by using smartphone technology
Frank M Peters1, Richard Greeff, Neal Goldstein
1Department of Orthopaedic Surgery, Chris Hani Baragwanath Academic Hospital, University of the Witwatersrand, Johannesburg, South Africa.
The Journal of Arthroplasty
|January 17, 2012
Summary
This study introduces an iPhone-based system for precise acetabular cup placement during total hip arthroplasty. The novel method ensures accurate positioning within the safe zone, improving surgical outcomes.
Area of Science:
- Orthopedic Surgery
- Medical Device Technology
Background:
- Accurate acetabular cup placement is crucial for successful total hip arthroplasty (THA).
- Conventional and computer-assisted methods face challenges, particularly with posterior approaches and lateral positioning.
- Achieving placement within Lewinnek's safe zone (anteversion 15° ± 10°, lateral inclination 40° ± 10°) is critical for long-term implant survival.
Purpose of the Study:
- To develop and evaluate a novel, accessible system for improving acetabular cup orientation during THA.
- To assess the accuracy and efficiency of using smartphone applications for intraoperative guidance.
Main Methods:
- Development of a system utilizing an iPhone's accelerometer and camera.
- Integration of a level indicator and protractor application for real-time measurement.
- Prospective evaluation in 50 THA cases, assessing placement accuracy and consistency.
Main Results:
- The iPhone-based system demonstrated accuracy and speed in acetabular cup placement.
- All 50 cases achieved placement within a narrow range of the defined safe zone.
- Minimal differences (<5%) were observed between pre-, intra-, and post-operative acetabular inclination measurements.
Conclusions:
- Smartphone technology offers a viable, accurate, and rapid solution for acetabular cup placement in THA.
- This system enhances surgical precision, potentially reducing revision rates and improving patient outcomes.
- The described method provides an affordable and accessible alternative for orthopedic surgeons worldwide.
