Biomechanics of iFuse, Initial & Post Cycles (Lindsey - MDER 2014)

Evaluation of A Minimally Invasive Procedure for Sacroiliac Joint Fusion – An in vitro Biomechanical Analysis of Initial and Cycled Properties

Lindsey D, Perez-Orribo L, Rodriquez-Martinez N, Reyes PM, Newcomb A, Cable A, Hickam G, Yerby SA, Crawford NR.
Med Devices (Auckl). 2014;7:131–7. DOI: 10.2147/MDER.S63499. PMCID: PMC4031207

ABSTRACT

Introduction: Sacroiliac (SI) joint pain has become a recognized factor in low back pain. The purpose of this study was to investigate the effect of a minimally invasive surgical SI joint fusion procedure on the in vitro biomechanics of the SI joint before and after cyclic loading.

Methods: SEVEN CADAVERIC SPECIMENS WERE TESTED UNDER THE FOLLOWING CONDITIONS: intact, posterior ligaments (PL) and pubic symphysis (PS) cut, treated (three implants placed), and after 5,000 cycles of flexion-extension. The range of motion (ROM) in flexion-extension, lateral bending, and axial rotation was determined with an applied 7.5 N · m moment using an optoelectronic system. Results for each ROM were compared using a repeated measures analysis of variance (ANOVA) with a Holm-Šidák post-hoc test.

Results: Placement of three fusion devices decreased the flexion-extension ROM. Lateral bending and axial rotation were not significantly altered. All PL/PS cut and post-cyclic ROMs were larger than in the intact condition. The 5,000 cycles of flexion-extension did not lead to a significant increase in any ROMs.

Discussion: In the current model, placement of three 7.0 mm iFuse Implants significantly decreased the flexion-extension ROM. Joint ROM was not increased by 5,000 flexion-extension cycles.

KEYWORDS: arthrodesis; biomechanics; cadaver; iliosacral

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