title: Multivariate analysis of factors associated with kyphotic deformity after laminoplasty in cervical spondylotic myelopathy patients without preoperative kyphotic alignment.
abstract: The risk factors of post-laminoplasty kyphosis in patients with cervical spondylotic myelopathy (CSM) without preoperative kyphotic alignment are not well known. This study aimed to compare clinical and radiological data between patients with or without post-laminoplasty kyphosis and to investigate the factors associated with post-laminoplasty kyphosis in CSM patients without preoperative kyphotic alignment. Patients (n = 194) who received unilateral expansive open-door cervical laminoplasty with miniplate fixation and completed a 1-year follow-up were enrolled. Patients were grouped according to whether they suffered from postoperative kyphosis (P) or not (NP). Postoperative kyphosis was observed in 21 (10.8%) patients. The recovery rates of the Japanese Orthopaedic Association scores at the 1-year follow-up in the P group were inferior to those in the NP group (31.9% vs. 65.2%, P < 0.001). Logistic regression with post-laminoplasty kyphosis as the dependent variable showed independent risks associated with an increased C2-7 sagittal vertical axis (SVA, odds ratio [OR] = 1.085, 95% confidence interval [CI] = 1.025-1.203, P = 0.015), destroyed facet joints (OR = 1.132, 95% CI = 1.068-1.208, P < 0.001), and cephalad vertebral level undergoing laminoplasty (CVLL, OR = 2.860, 95% CI = 1.164-6.847, P = 0.021). These findings suggest that CVLL, C2-7 SVA, and destroyed facet joints are associated with kyphosis after laminoplasty in CSM patients without preoperative kyphotic alignment.
authors.affiliation: Department of Orthopedics, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, People's Republic of China.
authors.forename: JunMing
authors.initials: J
authors.lastname: Cao
authors.affiliation: Department of Spinal Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, People's Republic of China.
authors.forename: JingTao
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Spinal Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, People's Republic of China.
authors.forename: DaLong
authors.initials: D
authors.lastname: Yang
authors.affiliation: Department of Orthopedics, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, People's Republic of China.
authors.forename: Liu
authors.initials: L
authors.lastname: Yang
authors.affiliation: Department of Spinal Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, People's Republic of China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Shen
mesh_terms: D000368:Aged; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D005260:Female; D006801:Humans; D007738:Kyphosis / Q000000981:diagnostic imaging* / Q000209:etiology / Q000473:pathology; D065406:Laminoplasty / Q000379:methods*; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011183:Postoperative Complications / Q000000981:diagnostic imaging* / Q000473:pathology; D011379:Prognosis; D011859:Radiography; D012189:Retrospective Studies; D012307:Risk Factors; D013118:Spinal Cord Diseases / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D055009:Spondylosis / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery