Abstract:
This study provides an in-depth biomechanical exploration of the mechanical consequences involved in altering the center of rotation in reverse shoulder arthroplasty (RSA) implant design. Utilizing finite element modeling approaches, the research systematically analyzes how variations in the lateralization and inferior tilt of the RSA implant affect joint stability, muscle force demands, range of motion, and potential impingement scenarios. A comprehensive series of simulations are executed using detailed shoulder geometries derived from imaging data, coupled with realistic mechanical loading conditions representing daily activities. Results indicate that lateralization of the implant significantly increases the available impingement-free range of motion but simultaneously elevates the required deltoid muscle force, indicating biomechanical trade-offs between range of motion improvements and muscle force increases. The study highlights the critical balance necessary in RSA design, demonstrating that subtle geometric adjustments profoundly influence joint biomechanics, impingement potential, and muscular demands, thereby informing future surgical decisions and implant innovations aimed at optimizing patient outcomes.
