• Kota Suda, Kuniyoshi Abumi, Manabu Ito, Yasuhiro Shono, Kiyoshi Kaneda, and Masanori Fujiya.
• Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan. sudako@med.hokudai.ac.jp
• Spine. 2003 Jun 15;28(12):1258-62.

Study DesignThis retrospective study analyzed the effects of cervical alignment on surgical results of expansive laminoplasty (ELAP) for cervical spondylotic myelopathy (CSM).ObjectiveTo determine the limitation of posterior decompression by ELAP for CSM in the presence of local kyphosis.Summary Of Background DataSeveral studies have reported that cervical malalignment affected surgical outcomes of ELAP. However, there has been no report to demonstrate crucial determinants of surgical outcomes of ELAP for CSM in relation to cervical sagittal alignment.MethodsThe study group comprised 114 patients who underwent ELAP for CSM. All were followed up for more than 2 years. The Japanese Orthopedic Association (JOA) scoring system for cervical myelopathy (full score, 17 points) was used to evaluate surgical outcomes for each patient 2 years after surgery. Statistical analysis with multivariate logistic regression models was used to ascertain the risk factors affecting postoperative surgical outcomes.ResultsThe average JOA scores were 9.9 points before surgery and 14 points 2 years after surgery. The recovery rate was 60.2%. Statistical analysis showed that signal intensity change on MRI and local kyphosis were the most crucial risk factors for poor surgical outcomes. Calculated with the logistic regression model, the highest risk of poor recovery was local kyphosis exceeding 13 degrees.ConclusionsThe influence of cervical malalignment on neurologic recovery after ELAP for CSM was shown. When patients have local kyphosis exceeding 13 degrees, anterior decompression or posterior correction of kyphosis as well as ELAP should be considered. Expansive laminoplasty for CSM is best indicated for patients with local kyphosis less than 13 degrees.

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