Please login to view this media
- Talk
- 15/09/2021
- Canada
Validation of a Reverse Shoulder Arthroplasty Finite Element Model That Accounts for Screw Type and Preload
Description
In this presentation, Joshua Giles discusses a study focused on reverse total shoulder arthroplasty (RTSA) and its implications for implant fixation. The speaker highlights the mechanics of shear loads and bending moments affecting the glenosphere and base plate of the implant. To address these concerns, the study investigates various parameters associated with screw fixation, including the number and types of screws, preload magnitudes, and screw directionality.
Giles explains that four finite element (FE) models of RTSA were developed using heterogeneous bone material properties derived from quantitative CT scans. The models featured different screw configurations, including locking and compression screws, and simulated virtual surgeries to analyze loads and boundary conditions reflective of experimental conditions.
The study utilized a systematic approach to measure micromotion between the base plate and the rearmed glenoid surface under applied loads. Results indicated that the developed FE models correlatively simulated the mechanics of varying bone properties and screw characteristics, although discrepancies in micromotion were noted between experimental and modeled results.
These differences raise important questions about the simplification of screw design in modeling efforts and prompt a call for more accurate representations in future studies, including the adoption of realistic threaded screws. The speaker concludes by emphasizing ongoing efforts to refine RTSA models and resolve systematic measurement errors previously encountered.