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Subject

Risk Factors of Cage Subsidence after Posterior Lumbar Interbody Fusion
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후방 요추체간 유합술 후 케이지 침강의 위험 인자

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Type
Academic journal
Author
Dong Yeong Lee (경상대학교 의학전문대학원 정형외과학교실) 정순택 (경상대학교) 홍창화 (순천향대학교) Dae Cheol Nam (경상대학교 의학전문대학원 정형외과학교실) 강병훈 (경상대학교 의학전문대학원 정형외과학교실) 김동희 (경상대학교)
Journal
대한척추외과학회 대한척추외과학회지 대한척추외과학회지 제23권 제2호 KCI Accredited Journals
Published
2016.1
Pages
100 - 107 (8page)

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Risk Factors of Cage Subsidence after Posterior Lumbar Interbody Fusion
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Study Design: Retrospective study. Objectives: The purpose of this study was to evaluate risk factors for subsidence after posterior lumbar interbody fusion (PLIF). Summary of Literature Review: Body mass index (BMI), bone mineral density (BMD), cage characteristics (titanium or poly-ether-etherketone (PEEK)) and degree of disc distraction are risk factors for cage subsidence after PLIF. Materials and Methods: From January 2010 to January 2015, a total of 69 patients (93 segments) who were diagnosed with degenerative lumbar spine disease at the current authors’ institution and underwent follow-up for at least 1 year were included in this retrospective study. Data on all factors related to cage subsidence were taken into consideration. The degree of association for each of the factors was determined through the calculation of odds ratios (ORs) with a 95% confidence interval. Logistic regression analyses were performed. The P-value that represented statistical significance was set below 0.05. Results: There were no significant associations between fused segment level and cage subsidence (p=0.588), nor were there any significant associations between the kind of cage (titanium or PEEK) and cage subsidence (p=0.371). Using logistic regression, the factors with a P-value below the 0.20 level in univariate analyses were included in the multivariate analyses. In multivariate analyses, diabetes mellitus (DM) (p=0.029, OR, 4.524), osteoporosis (p=0.026, OR, 6.046), and degree of disc distraction (p=0.010, OR, 1.446) had significant associations with cage subsidence. In addition, there were significant associations between cage subsidence and instrument failure (p=0.008, OR, 8.235). Conclusions: DM and osteoporosis, which may affect bony structures, have significant associations with cage subsidence after PLIF. Cage insertion with excessive disc distraction during surgery may also affect cage subsidence after PLIF.

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