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- Talk
- 13/09/2021
- UK
Development of a System for Tracking Liner Orientation in Dual Mobility Hip Replacements
Description
The presentation features Matthew Shuttleworth from the University of Leeds, who discusses the development of a tracking system for dual mobility total hip replacements. He starts by explaining the anatomy of dual mobility hip implants, highlighting that they consist of an acetabular shell, a low-friction liner, and a femoral stem; the unique feature of the dual mobility design allows for increased stability and range of motion due to its ability to articulate with two bearing surfaces.
Matthew addresses the challenge of tracking the movement of the liner within the simulator, which isn't rotatable in the simulation setup, leading to difficulties in visual monitoring through traditional optical tracking methods obstructed by lubricant.
To address this, a bespoke orientation tracker was developed that attaches directly to the liner of the implant, utilizing an inertial tracking chip capable of high-frequency data acquisition, which allows for near real-time reconstruction of the liner's movements in a simulated environment.
He explains the validation process using a robotic arm for systematic testing under controlled conditions to assess measurement accuracy across different ranges of motion and speeds, with results showcasing very high accuracy with angular errors consistently below 1.1 degrees, and with effective waterproofing against common lubricants.
Matthew concludes by summarizing the success of the newly developed tracking system, emphasizing the ongoing efforts towards long-term testing and refining the tracker design, welcoming questions from the audience regarding the implications and specific challenges of their findings.