WANG Hao, CHEN Jing, MA Yi-hang, ZHU Qing-san. Correlation between vertebral canal occupying ratio of severe cervical ossification of posterior longitudinal ligament and postoperative C5 palsy[J]. Journal of Spinal Surgery, 2018, 16(1): 31-34.
Correlation between vertebral canal occupying ratio of severe cervical ossification of posterior longitudinal ligament and postoperative C5 palsy
WANG Hao, CHEN Jing, MA Yi-hang, ZHU Qing-san
Department of Orthopaedics, China-Japan Hospital, Jilin University, Changchun 130000, Jilin, China
Abstract:
Objective
To investigate the relationship between the incidence of C5 palsy and the vertebral canal occupying ratio after posterior cervical double open-door laminoplasty in severe cervical ossification of the posterior longitudinal ligament(OPLL).
Methods
From January 2014 to June 2017, a total of 44 patients with severe OPLL(vertebral canal occupying rate > 50%) were divided into 2 groups according to whether has postoperative C5 palsy:11 in palsy group and 33 in non-palsy group. All the patients underwent imaging examination. The vertebral canal occupying ratio, the number of vertebrae involved, OPLL classification, preoperative and postoperative Cobb's angles and Japanese Orthopaedic Association(JOA) scores for neurological funcion were measured and recorded. And the improvement rate of Cobb's angle and JOA score were calculated. The t test was used to analyze whether the differences in above factors between the 2 groups were statistically significant. Spearman correlation analysis and Logistic regression analysis were used to evaluate the correlation between statistically different factors and postoperative C5 palsy.
Results
The results of t test showed that there were significant differences between the 2 groups in vertebral canal occupying ratio, preoperative JOA score, postoperative JOA score and improvement rate of JOA score(P < 0.05), which were included in the correlation analysis. Spearman correlation analysis showed that vertebral canal occupying ratio was positively correlated with postoperative C5 palsy. Preoperative and postoperative JOA scores and improvement rate of JOA score were negatively correlated with postoperative C5 palsy. Logistic regression analysis showed that only vertebral canal occupying ratio entered the equation, and the vertebral canal occupying ratio was associated with postoperative C5 palsy.
Conclusion
The incidence of postoperative C5 palsy is higher in patients with severe cervical OPLL. The vertebral canal occupying ratio is positively correlated with postoperative C5 palsy. The higher the vertebral canal occupying ratio, the higher the incidence of postoperative C5 palsy.
Sakaura H, Hosono N, Mukai Y, et al. C5 palsy after decompression surgery for cervical myelopathy:review of the literature[J]. Spine(Phila Pa 1976), 2003, 28(21): 2447–2451.
DOI:10.1097/01.BRS.0000090833.96168.3F
[2]
Chen Y, Chen D, Wang X, et al. C5 palsy after laminectomy and posterior cervical fixation for ossification of posterior longitudinal ligament[J]. J Spinal Disord Tech, 2007, 20(7): 533–535.
DOI:10.1097/BSD.0b013e318042b655
[3]
Hirabayashi K, Miyakawa J, Satomi K, et al. Operative results and postoperative progression of ossification among patients with ossification of cervical posterior longitudinal ligament[J]. Spine(Phila Pa 1976), 1981, 6(4): 354–364.
DOI:10.1097/00007632-198107000-00005
[4]
Fukui M, Chiba K, Kawakami M, et al. Japanese Orthopaedic Association cervical myelopathy evaluation questionnaire(JOACMEQ):Part 2. Endorsement of the alternative item[J]. J Orthop Sci, 2007, 12(3): 241–248.
DOI:10.1007/s00776-007-1119-0
Sodeyama T, Goto S, Mochizuki M, et al. Effect of decompression enlargement laminoplasty for posterior shifting of the spinal cord[J]. Spine(Phila Pa 1976), 1999, 24(15): 1527–1532.
DOI:10.1097/00007632-199908010-00005
Khuyagbaatar B, Kim K, Park WM, et al. Biomechanical investigation of post-operative C5 palsy due to ossification of the posterior longitudinal ligament in different types of cervical spinal alignment[J]. J Biomech, 2017, 57: 54–61.
DOI:10.1016/j.jbiomech.2017.03.019
[12]
Iwasaki M, Okuda S, Miyauchi A, et al. Surgical strategy for cervical myelopathy due to ossification of the posterior longitudinal ligament. Part 1:clinical results and limitations of laminoplasty[J]. Spine(Phila Pa 1976), 2007, 32(6): 647–653.
DOI:10.1097/01.brs.0000257560.91147.86