Mar 14, 2014 - Screw. Author(s):. Vu H. Le, MD, Huntington Beach, California. Nickul Jain, MD, Orange, California. Nathanael D. Heckmann, MD, Long Beach, ...
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2014 AAOS Annual Meeting
Presentation Abstract Session:
811-825-Spine VI
Date/Time:
Friday, Mar 14, 2014, 5:00 PM - 5:06 PM
Location
Room 345
Presentation Number:
Paper 819
Title:
Biomechanical Evaluation of Supplemental Percutaneous Lumbo-Sacroiliac Screws Following Total Sacrectomy
Classification: +Basic Science/Biologics/Biomechanics (Spine) Keywords:
Biomechanics / Anatomy; Instrumentation; New Technique / Device; Instrument / Pedicle Screw
Author(s):
Vu H. Le, MD, Huntington Beach, California Nickul Jain, MD, Orange, California Nathanael D. Heckmann, MD, Long Beach, California Lawrence C. Wang, Orange, California S. S. Bederman, MD, PhD, FRCSC, Orange, California Alexander W. Turner, PhD, San Diego, California Thay Q. Lee, PhD, Long Beach, California
Abstract:
INTRODUCTION: A total sacrectomy is indicated for large metastatic or primary tumors of the sacrum. The most common surgical stabilization technique involves posterior lumbo-pelvic fixation with pedicle and iliac screws connected by rods; however, this procedure lacks adequate anterior spinal column support at the lumbo-pelvic junction, predisposing the posterior instrumentation to failure. Lumbo-sacroiliac (LSI) screws have been proposed to provide anterior column support at this junction while obviating the need for additional dissection. This is the first biomechanical study to assess the efficacy of the addition of LSI screws to the standard posterior lumbo-pelvic fixation after a total sacrectomy model. METHODS: After standardizing for bone-mineralized density, 10 cadaveric specimens were randomly assigned to one of two groups: with LSI (LSI+) screws and without LSI (LSI-) screws. Posterior L3 to pelvic instrumentation was performed for all specimens. Next, a total sacrectomy was done, and nondestructive cyclical loading followed by loadto-failure axial compression testing was performed. Stiffness, yield load, energy absorbed at yield load, ultimate load and energy absorbed at ultimate load were measured. A twotailed unpaired t-test was used for statistical analysis with statistical significance set at p
