Cervical Lordosis Ratio as a Novel Predictor for the Loss of Cervical Lordosis After Laminoplasty
Open Access
- 30 June 2021
- journal article
- research article
- Published by The Korean Spinal Neurosurgery Society in Neurospine
- Vol. 18 (2), 311-318
- https://doi.org/10.14245/ns.2040700.350
Abstract
Objective: Maintaining cervical lordosis (CL) after laminoplasty is important for indirect decompression of the spinal cord. This study aimed to identify preoperative dynamic radiographic predictors for the loss of CL after laminoplasty. Methods: We retrospectively analyzed 141 consecutive patients who underwent cervical laminoplasty for cervical myelopathy. The following radiographic parameters were measured before surgery and at 1 year of follow-up: CL, C7 slope, C2-7 sagittal vertical axis (SVA), C2-7 range of motion (ROM), CL in flexion, CL in extension, ROM of flexion (Flex ROM), and ROM of extension. The CL ratio (CLR) was defined as 100xFlex ROM/C2-7 ROM. Delta CL was defined as postoperative CL minus preoperative CL. Patients were classified into 2 groups: group K (kyphotic change group, Delta CL <=-10) and group C (control group, Delta CL >-10). Results: The patient population comprised 94 men and 47 women (mean age, 70.9 +/- 9.4 years), with 24 patients (17.0%) classified into group K. CL, C7 slope, and CLR were significantly higher in group K than in group C. The groups did not significantly differ in age, sex, C2-7 SVA, and C2-7 ROM. On multivariable analysis, the CLR was significantly associated with postoperative kyphotic changes. On receiver-operating characteristic curve analysis (area under the curve=0.717, p<0.001), the cutoff value for CLR was 68.9%, with sensitivity and specificity of 87.5% and 57.3%, respectively. Conclusion: The CLR, reflecting the balance between flexion and extension mobility, was identified as a novel predictor for CL loss after laminoplasty, with a cutoff value of 68.9%.Keywords
This publication has 21 references indexed in Scilit:
- Cervical Alignment and Range of Motion After LaminoplastySpine, 2012
- Cervical malalignment after laminoplasty: relationship to deep extensor musculature of the cervical spine and neurological outcomeJournal of Neurosurgery: Spine, 2007
- Sagittal Alignment of the Cervical Spine After the LaminoplastySpine, 2007
- Long-term Results of Expansive Open-Door Laminoplasty for Cervical Myelopathy−Average 14-Year Follow-up StudySpine, 2006
- Local Kyphosis Reduces Surgical Outcomes of Expansive Open-Door Laminoplasty for Cervical Spondylotic MyelopathySpine, 2003
- Minimum 10-Year Followup After En Bloc Cervical LaminoplastyClinical Orthopaedics and Related Research, 2003
- Extensor Musculature of the Cervical Spine After LaminoplastySpine, 2001
- Long-Term Results of Double-Door Laminoplasty for Cervical Stenotic MyelopathySpine, 2001
- Lordotic alignment and posterior migration of the spinal cord following en bloc open-door laminoplasty for cervical myelopathy: A magnetic resonance imaging studyZeitschrift für Neurologie, 1996
- Operative Results and Postoperative Progression of Ossification Among Patients With Ossification of Cervical Posterior Longitudinal LigamentSpine, 1981