Influence factors analysis of cage subsidence grading after posterior lumbar fusion in osteoporotic patients

English Keywords:Osteoporotic  Transforaminal lumbar interbody fusion  Cage subsidence grading  Influence factor analysis

English Abstract:

  【Abstract】 Objectives: To investigate the influence factors related to cage subsidence grading, and explore the association between cage subsidence grading and clinical outcomes after posterior lumbar interbody fusion in single level lumbar degenerative disease with osteoporosis. Methods: Data of 186 patients of lumbar degenerative disease with osteoporosis who underwent single level posterior decompression and interbody fusion from June 2013 to June 2015 were reviewed. The followings were recorded including general characteristics (age, sex, body weight, symptom duration), operation related information(operation time, blood loss, unilateral/bilateral decompression, tradition/cortical bone trajectory screw fixation, operated level) and radiological parameters(bone mineral density, cage subsidence grading, Modic changes, intervertebral space height, segmental lordosis, lumbar lordosis, sacral slope). All patients were divided into mild subsidence group(subsidence≤1mm), moderate subsidence group(1mm