title: Factors affecting neurological deficits and intractable back pain in patients with insufficient bone union following osteoporotic vertebral fracture.
abstract: The purpose of this study was to examine factors affecting the severity of neurological deficits and intractable back pain in patients with insufficient bone union following osteoporotic vertebral fracture (OVF). Reports of insufficient union following OVF have recently increased. Patients with this lesion have various degrees of neurological deficits and back pain. However, the factors contributing to the severity of these are still unknown. A total of 45 patients with insufficient union following OVF were included in this study. Insufficient union was diagnosed based on the findings of vertebral cleft on plain radiography or CT, as well as fluid collection indicating high-intensity change on T2-weighted MRI. Multivariate logistic regression analysis was performed to determine the factors contributing to the severity of neurological deficits and back pain in the patients. Age, sex, level of fracture, duration after onset of symptoms, degree of local kyphosis, degree of angular instability, ratio of occupation by bony fragments, presence or absence of protrusion of flavum, and presence or absence of ossification of the anterior longitudinal ligament (OALL) in the adjacent level were used as explanatory variables, while severity of neurological deficits and back pain were response variables. On multivariate analysis, factors significantly affecting the severity of neurological deficits were angular instability of more than 15 degrees [adjusted odds ratio (OR), 9.24 (95% confidence interval, CI 1.49-57.2); P < 0.05] and ratio of occupation by bony fragments in the spinal canal of more than 42% [adjusted OR 9.23 (95%CI 1.15-74.1); P < 0.05]. The factor significantly affecting the severity of back pain was angular instability of more than 15 degrees [adjusted OR 14.9 (95%CI 2.11-105); P < 0.01]. On the other hand, presence of OALL in the adjacent level reduced degree of back pain [adjusted OR 0.14 (95%CI 0.03-0.76); P < 0.05]. In this study, pronounced angular instability and marked posterior protrusion of bony fragments in the canal were factors affecting neurological deficits. In addition, marked angular instability was a factor affecting back pain. These findings are useful in determining treatment options for patients with insufficient union following OVF.
authors.affiliation: Department of Orthopedic Surgery, Osaka City University Graduate School of Medicine, Osaka, Japan.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Hoshino
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Nakamura
authors.forename: Hidetomi
authors.initials: H
authors.lastname: Terai
authors.forename: Tadao
authors.initials: T
authors.lastname: Tsujio
authors.forename: Masaharu
authors.initials: M
authors.lastname: Nabeta
authors.forename: Takashi
authors.initials: T
authors.lastname: Namikawa
authors.forename: Akira
authors.initials: A
authors.lastname: Matsumura
authors.forename: Akinobu
authors.initials: A
authors.lastname: Suzuki
authors.forename: Kazushi
authors.initials: K
authors.lastname: Takayama
authors.forename: Kunio
authors.initials: K
authors.lastname: Takaoka
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001416:Back Pain / Q000209:etiology / Q000503:physiopathology*; D001861:Bone Regeneration / Q000502:physiology; D015984:Causality; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000209:etiology / Q000503:physiopathology; D008022:Ligaments / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009999:Ossification, Heterotopic / Q000000981:diagnostic imaging / Q000473:pathology; D010024:Osteoporosis / Q000150:complications*; D010148:Intractable Pain / Q000209:etiology / Q000503:physiopathology; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013115:Spinal Canal / Q000000981:diagnostic imaging / Q000473:pathology; D013117:Spinal Cord Compression / Q000209:etiology / Q000503:physiopathology*; D013121:Spinal Curvatures / Q000209:etiology / Q000503:physiopathology; D016103:Spinal Fractures / Q000150:complications / Q000473:pathology / Q000503:physiopathology*; D013131:Spine / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology; D014057:Tomography, X-Ray Computed; D014945:Wound Healing / Q000502:physiology