Screw Loosening in Posterior Spine Fusion: Prevalence and Risk Factors

Global Spine Journal
Laura Marie-HardyCaroline Scemama

Abstract

Retrospective cohort study. Screw loosening in spinal fusion is poorly defined. Accordingly, its prevalence rates range from 1% to 60%, and its risk factors remain undefined. The goal of this study was to assess the prevalence of screw loosening, according to precise definitions, and to identify factors associated with it. We retrospectively reviewed records for 166 patients who underwent a posterior spinal fusion in our institution between 2011 and 2016. We recorded demographic data, osteoporosis, pelvic balance, surgery-related information, and postoperative radiographic data at a minimum follow-up of 6 months. Univariable and multivariable logistic regression models were used. Significance was defined by P < .05. When loosening was defined by partial pull-out, its prevalence was 9.6% (95% CI 5.6-15); thoracic localization, the use of CrCo (chromium-cobalt) rods, osteoporosis, PI/LL (pelvic incidence/lumbar lordosis) mismatch (preoperative), and frontal imbalance (preoperative) were significant risk factors. When loosening was defined by osteolysis (radiolucent rim) >1 mm around at least 1 screw, its prevalence was 40.4% (95% CI 33-48) and age, scoliosis as indication for fusion, ASA (American Society of Anesthesiologists) 2 ...Continue Reading

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Citations

Feb 10, 2021·Zhurnal voprosy neĭrokhirurgii imeni N. N. Burdenko·A S EliseyevA A Mordvinov
Jun 5, 2021·World Neurosurgery·Lennart ViezensLukas Weiser

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Methods Mentioned

BETA
pullout

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