scholarly journals Comparative Five-Year Surgical Outcomes of Open-Door versus French-Door Laminoplasty in Multilevel Cervical Spondylotic Myelopathy

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Guoliang Chen ◽  
Xizhe Liu ◽  
Ensi Zhao ◽  
Ningning Chen ◽  
Fuxin Wei ◽  
...  
Keyword(s):  
Postoperative Complications ◽  
Cobb Angle ◽  
Surgical Outcomes ◽  
Cervical Spondylotic Myelopathy ◽  
Loss Rate ◽  
Japanese Orthopaedic Association ◽  
Medical Costs ◽  
Open Door ◽  
Multilevel Cervical Spondylotic Myelopathy

Objective. To compare the five-year surgical outcomes between Open-Door laminoplasty (ODL) and French-Door laminoplasty (FDL) in the management of multilevel cervical spondylotic myelopathy (MCSM). Methods. Sixty patients with MCSM, who were operated by ODL or FDL, were included in this study and followed up for at least 5 years. The average follow-up period was 69.2 ± 3.2 months. The modified Japanese Orthopaedic Association (mJOA) score and radiological assessments including the Cobb angle and cervical range of motion (ROM) were evaluated and compared before surgery and at the final follow-up. The incidence of postoperative complications and medical costs were also compared. Results. Both ODL and FDL groups achieved significant improvements of the mJOA score in postoperative 5 years; the average recovery rate (RR) of the mJOA score in the ODL and FDL groups was 72.14 ± 6.97 % and 69.53 ± 7.51 % , respectively. No statistically significant differences regarding the pre- and postoperative mJOA score, the RR of the mJOA score, the loss and the loss rate of the Cobb angle, and the incidence of postoperative complications existed between ODL and FDL. The mean loss and the loss rate of cervical ROM in the FDL group ( 18.70 ± 8.91 ° , 41.08 ± 11.17 % ) were significantly higher than those of the ODL group ( 13.81 ± 8.62 ° , 31.47 ± 12.43 % ) ( P < 0.05 ). FDL reduced medical costs more greatly than ODL ( 33014.37 ± 3424.12 China Yuan versus 82096.62 ± 7093.07 China Yuan, P < 0.001 ). Conclusions. Both ODL and FDL are effective for MCSM. The 5-year neurological results are similar between the two groups. ODL trends to be superior to FDL in postoperative preservation of cervical ROM while FDL reduced medical costs more greatly.

“Skip” corpectomy in the treatment of multilevel cervical spondylotic myelopathy and ossified posterior longitudinal ligament

2010 ◽  
Vol 12 (1) ◽  
pp. 33-38 ◽  
Author(s):  
Sedat Dalbayrak ◽  
Mesut Yilmaz ◽  
Sait Naderi
Keyword(s):  
Vertebral Body ◽  
Cervical Spondylotic Myelopathy ◽  
Japanese Orthopaedic Association ◽  
Posterior Longitudinal Ligament ◽  
Japanese Orthopaedic Association Score ◽  
Cervical Lordosis ◽  
The Mean ◽  
Ossified Posterior Longitudinal Ligament ◽  
Multilevel Cervical Spondylotic Myelopathy

Object The authors reviewed the results of “skip” corpectomy in 29 patients with multilevel cervical spondylotic myelopathy (CSM) and ossified posterior longitudinal ligament (OPLL). Methods The skip corpectomy technique, which is characterized by C-4 and C-6 corpectomy, C-5 osteophytectomy, and C-5 vertebral body preservation, was used for decompression in patients with multilevel CSM and OPLL. All patients underwent spinal fixation using C4–5 and C5–6 grafts, and anterior cervical plates were fixated at C-3, C-5, and C-7. Results The mean preoperative Japanese Orthopaedic Association score increased from 13.44 ± 2.81 to 16.16 ± 2.19 after surgery (p < 0.05). The cervical lordosis improved from 1.16 ± 11.74° to 14.36 ± 7.85° after surgery (p < 0.05). The complications included temporary hoarseness in 3 cases, dysphagia in 1 case, C-5 nerve palsy in 1 case, and C-7 screw pullout in 1 case. The mean follow-up was 23.2 months. The final plain radiographs showed improved cervical lordosis and fusion in all cases. Conclusions The authors conclude that the preservation of the C-5 vertebral body provided an additional screw purchase and strengthened the construct. The results of the current study demonstrated effectiveness and safety of the skip corpectomy in patients with multilevel CSM and OPLL.

scholarly journals Ten-Year Surgical Outcomes and Prognostic Factors for French-Door Laminoplasty in the Treatment of Multilevel Cervical Spondylotic Myelopathy

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Guoliang Chen ◽  
Xizhe Liu ◽  
Ningning Chen ◽  
Bailing Chen ◽  
Xuenong Zou ◽  
...  
Keyword(s):  
Prognostic Factors ◽  
Cobb Angle ◽  
Signal Intensity ◽  
Cervical Spondylotic Myelopathy ◽  
Operative Time ◽  
Symptom Duration ◽  
Preoperative Symptom ◽  
Age At Surgery ◽  
Multilevel Cervical Spondylotic Myelopathy

Objective. To analyze the ten-year surgical outcomes and postoperative complications of French-Door laminoplasty (FDL) in the management of multilevel cervical spondylotic myelopathy (MCSM) and analyze the prognostic factors for FDL in treating MCSM. Methods. 64 patients with MCSM, who were operated by FDL, were included in this study and followed up for at least 10 years. Clinical assessments including modified Japanese Orthopaedic Association (mJOA) score, age at surgery, preoperative symptom duration, operative time, blood loss and postoperative complications, radiological assessments including Cobb angle, cervical range of motion (ROM), intramedullary signal intensity on T2W MRI, canal narrowing ratio (CNR), and maximum spinal cord compression (MSCC). mJOA score, Cobb angle, cervical ROM, intramedullary signal intensity on T2W MRI, and CNR were assessed before surgery and at the final follow-up. Results. The average mJOA score was significantly improved from preoperative 10.32±1.63 points to 15.10±0.62 points at the final follow-up (p<0.05). The average RR of the mJOA score at the final follow-up was 69.10±7.32%. The cervical Cobb angle and ROM decreased significantly at the final follow-up. Patients with high intramedullary signal intensity of T2W MRI or CNR more than 50% showed a lower RR of the mJOA score. Correlation analysis revealed that preoperative symptom duration and intramedullary signal intensity of T2W MRI, CNR, MSCC, and blood loss were significantly correlated with the RR of the mJOA score. Gender, operative method, and age at surgery were significantly correlated with the preservation rate of ROM. Operative time was significantly correlated with the incidence of axial symptoms. Conclusions. The ten-year clinical outcomes of FDL were satisfactory. Higher intramedullary signal intensity of T2W MRI and a greater CNR predicted poorer prognoses.

A New Posterior Extensor Attachment-Point Reconstruction Technique for Cervical Spondylotic Myelopathy Involving C2 Segment: Clinical Outcome and Safety

2020 ◽  
Author(s):  
Hai-Yun Yang ◽  
Yun-Ge Zhang ◽  
Dong Zhao ◽  
Gui-Ming Sun ◽  
Yi Ma ◽  
...  
Keyword(s):  
Cervical Spondylotic Myelopathy ◽  
Plate Fixation ◽  
Japanese Orthopaedic Association ◽  
Neurological Dysfunction ◽  
Reconstruction Technique ◽  
Open Door ◽  
Titanium Plate ◽  
Attachment Point ◽  
Curvature Index ◽  
Axial Symptoms

Abstract Background and Study Aim Cervical spondylotic myelopathy (CSM) is a common degenerative disease that mainly occurs in elder patients, leading to different degrees of neurological dysfunction. Spinal cord involvement is mainly distributed at the C3–C7 segments, but it may also involve up to the C2 level. This study aimed to assess the clinical efficacy and safety of open-door laminoplasty using a new extensor attachment-point reconstruction technique for treating CSM involving the C2 segment. Patients and Methods Fifty-nine patients with CSM involving the C2 segment and undergoing open-door laminoplasty were included in this retrospective study. Based on the titanium plate used in the operation, patients were divided into two groups, a reconstructed titanium plate fixation (RPF) group (n = 28) and a conventional titanium plate fixation (CPF) group (n = 31). Improvements in neurological function, cervical range of motion (ROM), cervical curvature index (CCI), preservation of posterior cervical muscle mass, and axial symptoms were compared between the two groups. Results There were no significant differences in operative time and intraoperative blood loss between the groups (p > 0.05). The Japanese Orthopaedic Association (JOA) score significantly increased in both groups postsurgery (p < 0.05); the neurological recovery rate was similar between the two groups (64.1 ± 13.3% vs. 65.9 ± 14.7%, p > 0.05). There was no significant loss of cervical ROM in either group (p > 0.05). The anteroposterior dural sac diameter at the C2 level was significantly enlarged in both groups (p < 0.05). Alternatively, CCI was significantly reduced in the CRP group (p < 0.05) but unchanged in the RPF group (p > 0.05). The cross-sectional area of the posterior cervical muscles was also significantly reduced in the CPF group (p < 0.05) but maintained in the RPF group (p > 0.05). Finally, axial symptoms were more severe in the CPF group than in the RPF group (p < 0.05). Conclusion Laminoplasty is an effective surgical procedure for CSM involving the C2 segment. The reconstructed titanium plate achieved superior maintenance of cervical curvature and reduced both muscle atrophy and severity of axial symptoms compared with titanium conventional plates.

scholarly journals The Midterm Surgical Outcome of Modified Expansive Open-Door Laminoplasty

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Kuang-Ting Yeh ◽  
Ru-Ping Lee ◽  
Ing-Ho Chen ◽  
Tzai-Chiu Yu ◽  
Cheng-Huan Peng ◽  
...  
Keyword(s):  
Neck Pain ◽  
Facet Joint ◽  
Japanese Orthopaedic Association ◽  
Neck Disability Index ◽  
Standard Technique ◽  
Invasive Technique ◽  
Open Door ◽  
Gradual Improvement ◽  
Less Invasive

Laminoplasty is a standard technique for treating patients with multilevel cervical spondylotic myelopathy. Modified expansive open-door laminoplasty (MEOLP) preserves the unilateral paraspinal musculature and nuchal ligament and prevents facet joint violation. The purpose of this study was to elucidate the midterm surgical outcomes of this less invasive technique. We retrospectively recruited 65 consecutive patients who underwent MEOLP at our institution in 2011 with at least 4 years of follow-up. Clinical conditions were evaluated by examining neck disability index, Japanese Orthopaedic Association (JOA), Nurick scale, and axial neck pain visual analog scale scores. Sagittal alignment of the cervical spine was assessed using serial lateral static and dynamic radiographs. Clinical and radiographic outcomes revealed significant recovery at the first postoperative year and still exhibited gradual improvement 1–4 years after surgery. The mean JOA recovery rate was 82.3% and 85% range of motion was observed at the final follow-up. None of the patients experienced aggravated or severe neck pain 1 year after surgery or showed complications of temporary C5 nerve palsy and lamina reclosure by the final follow-up. As a less invasive method for reducing surgical dissection by using various modifications, MEOLP yielded satisfactory midterm outcomes.

scholarly journals Anterior Controllable Antedisplacement and Fusion (ACAF) technique for the treatment of multilevel cervical spondylotic myelopathy with spinal stenosis (MCSMSS): a retrospective study of 45 cases

2019 ◽  
Author(s):  
Xi Luo ◽  
Kaiqiang Sun ◽  
Jingchuan Sun ◽  
Shunmin Wang ◽  
Yuan Wang ◽  
...  
Keyword(s):  
Spinal Stenosis ◽  
Cervical Spondylotic Myelopathy ◽  
Japanese Orthopaedic Association ◽  
Neck Disability Index ◽  
Operation Time ◽  
Significant Difference ◽  
Csf Leakage ◽  
One Year ◽  
Neck Disability ◽  
Multilevel Cervical Spondylotic Myelopathy

Abstract Background To investigate the clinical effect of anterior controllable antedisplacement and fusion (ACAF) technique for the treatment of multilevel cervical spondylotic myelopathy with spinal stenosis (MCSMSS), and compare ACAF with hybrid decompression fixation (HDF). Methods A retrospective analysis of 85 cases with MCSMSS was carried out. 45 patients were treated with ACAF, while 40 patients were treated with HDF. The operation time, intraoperative bleeding volume, postoperative complications, Japanese Orthopaedic Association (JOA) score, Neck Disability Index (NDI) score, Computed Tomography (CT) transverse measurement, cervical curvature and Kang's grade were compared between two groups. Results The patients were followed up for 12 to 17 months. Compared with HDF, ACAF group achieved better decompression according to CT measurement and Kang’s grade (P < 0.05), and recovered to a greater cervical Cobb’s angle (P < 0.05). However, JOA score and NDI index showed no significant difference one year after surgery (P＞0.05). Additionally, ACAF presented longer operation time and greater intraoperative blood loss (P < 0.05). As to complications, ACAF developed less incidences of cerebrospinal fluid examination (CSF) leakage, neurologic deterioration, epidural hematoma and C5 palsy by comparing with HDF. Conclusions ACAF is an effective method for the treatment of MCSMSS. Compared with HDF, ACAF has the advantages of significant decompression, increasing cervical curvature, and reducing the incidences of complications.

scholarly journals The surgical outcome of decompression alone versus decompression with limited fusion for degenerative lumbar scoliosis

2018 ◽  
Vol 29 (3) ◽  
pp. 259-264 ◽  
Author(s):  
Kenji Masuda ◽  
Takayuki Higashi ◽  
Katsutaka Yamada ◽  
Tatsuhiro Sekiya ◽  
Tomoyuki Saito
Keyword(s):  
Decision Making ◽  
Cobb Angle ◽  
Japanese Orthopaedic Association ◽  
Spinal Instability ◽  
Degenerative Lumbar Scoliosis ◽  
Surgical Decision ◽  
Lumbar Scoliosis ◽  
Radiological Parameters ◽  
Surgical Decision Making

OBJECTIVEThe aim of this study was to assess the usefulness of radiological parameters for surgical decision-making in patients with degenerative lumbar scoliosis (DLS) by comparing the clinical and radiological results after decompression or decompression and fusion surgery.METHODSThe authors prospectively planned surgical treatment for 298 patients with degenerative lumbar disease between September 2005 and March 2013. The surgical method used at their institution to address intervertebral instability is precisely defined based on radiological parameters. Among 64 patients with a Cobb angle ranging from 10° to 25°, 57 patients who underwent follow-up for more than 2 years postoperatively were evaluated. These patients were divided into 2 groups: those in the decompression group underwent decompression alone (n = 25), and those in the fusion group underwent decompression and short segmental fusion (n = 32). Surgical outcomes were reviewed, including preoperative and postoperative Cobb angles, lumbar lordosis based on radiological parameters, and Japanese Orthopaedic Association (JOA) scores.RESULTSThe JOA scores of the decompression group and fusion group improved from 5.9 ± 1.6 to 10.0 ± 2.8 and from 7.2 ± 2.0 to 11.3 ± 2.8, respectively, which was not significantly different between the groups. At the final follow-up, the postoperative Cobb angle in the decompression group changed from 14° ± 2.9° to 14.3° ± 6.4° and remained stable, while the Cobb angle in the fusion group decreased from 14.8° ± 4.0° to 10.0° ± 8.5° after surgery.CONCLUSIONSThe patients in both groups demonstrated improved JOA scores and preserved Cobb angles after surgery. The improvement in JOA scores and preservation of Cobb angles in both groups show that the evaluation of spinal instability using radiological parameters is appropriate for surgical decision-making.

Utility of modified transarticular screw in the middle and lower cervical spine as intermediate fixation in posterior long fusion surgery

2009 ◽  
Vol 11 (5) ◽  
pp. 555-561 ◽  
Author(s):  
Hiroshi Miyamoto ◽  
Masatoshi Sumi ◽  
Koki Uno
Keyword(s):  
Spinal Cord ◽  
Cervical Spine ◽  
Cobb Angle ◽  
Nerve Root ◽  
Japanese Orthopaedic Association ◽  
Transarticular Screw ◽  
Fusion Surgery ◽  
Nerve Root Injury ◽  
A New Technique

Object The use of a pedicle screw (PS) in the cervical spine ensures strong fixation. However, 6.7–29% of such screws appear to be malpositioned using manual insertion techniques, especially at C-3 to C-6 where the pedicle diameter is smaller, potentially causing catastrophic complications such as vertebral artery (VA) and spinal cord or nerve root injuries. To optimize safety, the authors use a new technique: cephalad and/or caudad ends at C-2 and C-7/T-1, respectively, are fixed with PSs, and intermediate points around C3–6 are fixed using a modified transarticular screw technique that captures 3 dorsal cortices and preserves the ventral cortex of the facet in posterior long fusion surgery involving occipitospinal fixation. The purpose of the present study was to demonstrate this technique and evaluate the clinical and radiological outcomes. Methods Thirty-nine patients, 8 men and 31 women, with a mean age of 61.7 ± 11.0 years at surgery, were included in the study. Twenty-eight occipitospinal fusions and 11 posterior long fusions were performed. Patients were divided into 2 groups: a rheumatoid arthritis (RA) group consisting of 26 patients and a non-RA group of 13 patients including 7 with athetoid cerebral palsy. Clinical outcomes were evaluated according to the Japanese Orthopaedic Association (JOA) score. For radiological evaluation, the Cobb angle on lateral radiographs was measured preoperatively, postoperatively, and at the final follow-up, and the degree of realignment from pre- to postoperation and the loss of correction from postoperation to the follow-up were compared between the 2 patient groups. Results The recovery rate of the JOA score was 50.6 ± 20.7% in the RA group and 37.3 ± 24.3% in the non-RA group. Neither VA injury nor spinal cord or nerve root injury occurred among this series. The degree of realignment was greater in the non-RA group (9.2 ± 13.9°) than the RA group (1.4 ± 12.7°) as the Cobb angle was more kyphotic preoperatively in the non-RA group (2.9 ± 18.6°) than in the RA group (17.4 ± 15.7°). However, 38.5% of patients in the non-RA group had a correction loss > 10% compared with 7.7% in the RA group; this difference was statistically significant. Conclusions The featured transarticular screw technique, which preserves the ventral cortex of the facet, as intermediate fixation in long fusion is a safe and easy procedure with few complications. It ensures acceptable clinical and radiological outcomes, especially in patients with RA.

scholarly journals A new expansive two-open-doors laminoplasty for multilevel cervical spondylotic myelopathy: technical report and follow-up results

2014 ◽  
Vol 72 (1) ◽  
pp. 49-54 ◽  
Author(s):  
Aluizio Augusto Arantes Júnior ◽  
Geraldo Alves da Silva Junior ◽  
José Augusto Malheiros ◽  
Fernando Flavio Gonçalves ◽  
Marcelo Magaldi ◽  
...  
Keyword(s):  
Cervical Spondylotic Myelopathy ◽  
Radiographic Evaluation ◽  
Follow Up Study ◽  
Post Surgery ◽  
Technical Report ◽  
Significant Difference ◽  
The Mean ◽  
Clinical And Radiological Results ◽  
Multilevel Cervical Spondylotic Myelopathy

The laminoplasty technique was devised by Hirabayashi in 1978 for patients diagnosed with multilevel cervical spondylotic myelopathy. Objective: To describe an easy modification of Hirabayashi’s method and present the clinical and radiological results from a five-year follow-up study. Method and Results: Eighty patients had 5 levels of decompression (C3-C7), 3 patients had 6 levels of decompression (C2-T1) and 3 patients had 4 levels of decompression (C3-C6). Foraminotomies were performed in 23 cases (27%). Following Nurick`s scale, 76 patients (88%) improved, 9 (11%) had the same Nurick grade, and one patient worsened and was advised to undergo another surgical procedure. No deaths were observed. The mean surgery time was 122 min. Radiographic evaluation showed an increase in the mean sagittal diameter from 11.2 mm at pretreatment to 17.3 mm post surgery. There was no significant difference between pretreatment and post-surgery C2-C7 angles. Conclusions: This two-open-doors laminoplasty technique is safe, easy and effective and can be used as an alternative treatment for cases of multilevel cervical spondylotic myelopathy without instability.

Risk factors for closure of lamina after open-door laminoplasty

2008 ◽  
Vol 9 (6) ◽  
pp. 530-537 ◽  
Author(s):  
Morio Matsumoto ◽  
Kota Watanabe ◽  
Takashi Tsuji ◽  
Ken Ishii ◽  
Hironari Takaishi ◽  
...  
Keyword(s):  
Risk Factors ◽  
Patient Satisfaction ◽  
Neck Pain ◽  
Cervical Myelopathy ◽  
Japanese Orthopaedic Association ◽  
Pain Patient ◽  
Open Door ◽  
Vertebral Level ◽  
Recovery Rates

Object This retrospective study was conducted to evaluate the prevalence and clinical consequences of postoperative lamina closure after open-door laminoplasty and to identify the risk factors. Methods Eighty-two consecutive patients with cervical myelopathy who underwent open-door laminoplasty without plates or spacers in the open side (Hirabayashi's original method) were included (62 men and 20 women with a mean age of 62 years and a mean follow-up of 1.8 years). In 67 patients the cause of cervical myelopathy was spondylotic myelopathy, and in 15 it was caused by ossification of posterior longitudinal ligament. Radiographic measurements were made of the anteroposterior diameters of the spinal canal and vertebral bodies from C3–6, and the presence of kyphosis were assessed. Lamina closure was defined as ≥ 10% decrease in the canal-to-body ratio at the final follow-up compared with that immediately after surgery at ≥ 1 vertebral level. The impact of lamina closure on neck pain, patient satisfaction, Japanese Orthopaedic Association scores, and recovery rates were also evaluated. Results The mean canal-to-body ratio at C3–6 was 0.69–0.72 preoperatively, 1.25–1.28 immediately after surgery, and 1.18–1.24 at the final follow-up examination. Lamina closure was observed in 34% of patients and was not associated with sex, age, or cause of myelopathy, but was significantly associated with the presence of preoperative kyphosis (p = 0.014). Between patients with and without lamina closure, there was no significant difference in preoperative (9.7 ± 3.1 vs 10.6 ± 2.5) and postoperative (13.7 ± 2.4 vs 13.1 ± 2.7) Japanese Orthopaedic Association scores, recovery rates (53.9 ± 29.9% vs 44.3 ± 29.5%), neck pain scores (3.5 ± 0.7 vs 3.3 ± 1.0), or patient satisfaction level (4.0 ± 1.4 vs 4.8 ± 1.0). Conclusions Lamina closure at ≥ 1 vertebral level occurred in 34% of patients. Although patients with lamina closure obtained equivalent recovery from myelopathy in a short-term follow-up, they tended to be less satisfied with surgery compared with those who did not have closure. The only significant risk factor identified was the presence of preoperative cervical kyphosis, and preventative methods for lamina closure, therefore, should be considered for patients with preoperative kyphosis.

Prospective cohort study of mild cervical spondylotic myelopathy without surgical treatment

2012 ◽  
Vol 16 (1) ◽  
pp. 8-14 ◽  
Author(s):  
Masatoshi Sumi ◽  
Hiroshi Miyamoto ◽  
Teppei Suzuki ◽  
Shuichi Kaneyama ◽  
Takako Kanatani ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Surgical Treatment ◽  
Mr Imaging ◽  
Cervical Spondylotic Myelopathy ◽  
Japanese Orthopaedic Association ◽  
Rank Test ◽  
Imaging Findings ◽  
Significant Difference ◽  
The Mean

Object Because the main pathology of cervical spondylotic myelopathy (CSM) is spinal cord damage due to compression, surgical treatment is usually recommended to improve patient symptoms and prevent exacerbation. However, lack of clarity of prognosis in cases that present with insignificant symptoms, particularly those of mild CSM, lead one to question the veracity of this course of action. The purpose of this study was to elucidate the prognosis of mild CSM without surgical intervention by evaluation of clinical symptoms and MR imaging findings. Methods Sixty cases of mild CSM (42 males and 18 females, average age 57.2 years) presenting with scores of 13 or higher on the Japanese Orthopaedic Association (JOA) scale were treated initially by in-bed Good Samaritan cervical traction without surgery. These patients were enrolled between 1995 and 2003 and followed up periodically until the date of myelopathy deterioration or until the end of March 2009. The deterioration of myelopathy was defined as a decline in JOA score to less than 13 with a decrease of at least 2 points. As a prognostic factor, the authors used their classification of spinal cord shapes at their lateral sides on axial T1-weighted MR imaging. “Ovoid deformity” was classified as a situation in which both sides were round and convex, and “angular-edged deformity” where one or both sides exhibited an acute-angled lateral corner. The duration of follow-up was assessed as the tolerance rate of mild CSM using Kaplan-Meier survival analysis and compared between 2 groups classified by MR imaging findings. Furthermore, differences between groups were analyzed by various applications of the log-rank test. Results Of the initial 60 cases, follow-up records existed for 55, giving a follow-up rate of 91.7% (38 males and 17 females, average age 56.1 years). The mean JOA score at end point was 14.1, which was not statistically different from the mean of 14.5 at the initial visit. Deterioration in myelopathy was observed in 14 (25.5%) of 55 cases, whereas 41 (74.5%) of 55 cases maintained mild extent myelopathy without deterioration through the follow-up period (mean 94.3 months). The total tolerance rate of mild CSM was 70%. However, there was a significant difference in the tolerance rate between the cases with angular-edged deformity (58%) and cases with ovoid deformity (95%; p = 0.049). Conclusions The tolerance rate of mild CSM was 70% in this study, which proved that the prognosis of mild CSM without surgical treatment was relatively good. However, the tolerance rate of the cases with angular-edged deformity was 58%. Therefore, surgical treatment should be considered when mild CSM cases show angular-edged deformity on axial MR imaging, even if patients lack significant symptoms.

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