Keiichi Katsumi

Niigata University Medical and Dental Hospital

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i-10 index

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Kei Watanabe

Niigata University Medical and Dental Hospital

Masayuki Ohashi

Niigata University

Tôru Hirano

Niigata University Medical and Dental Hospital

Toshitaka Yoshii

Tokyo Medical and Dental University

Takashi Kaito

Osaka University

Shiro Imagama

Nagoya University

Takeo Furuya

Chiba University

Atsushi Kimura

Jichi Medical University

Naoto Endo

Tsubame Rosai Hospital

Masashi Yamazaki

University of Tsukuba

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Research Organization of Information and Systems

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Niigata University

Kitasato University

Japan Agency for Medical Research and Development

Niigata University Medical and Dental Hospital

Keio University

Chiba University

Nagoya University

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The Natural Course of Compensatory Lumbar Curves in Nonoperated Patients With Thoracic Adolescent Idiopathic Scoliosis

Spine (2018)

Masayuki Ohashi Kei Watanabe Tôru Hirano Kazuhiro Hasegawa Keiichi Katsumi

Study Design. A retrospective, long-term follow-up study. Objective. We investigated the natural course of compensatory lumbar curves in patients with primary thoracic adolescent idiopathic scoliosis (AIS). Summary of Background Data. The natural course of compensatory lumbar curves in primary thoracic AIS remains unknown. Methods. Inclusion criteria were right-sided primary thoracic AIS ≥30° with a Lenke lumbar modifier of A or B at skeletal maturity and ≥30 years of age at the time of the survey. Fifty-one patients (mean age, 40.2 yr) returned for a follow-up evaluation (follow-up rate, 34.2%). Patients were classified into three groups based on the lumbar modifier (A or B) and direction of L4 tilt [right (R) or left (L)] (AR, n.11; AL, n.18; and B, n.22). At the time of the survey, 42 patients underwent radiological examinations and 37 underwent lumbar magnetic resonance imaging. Quality of life questionnaires were completed in all patients and in a 1:1 matched control group (no history of scoliosis). Results. The thoracic curves had significantly progressed in all patient groups, while the compensatory lumbar curve progressed only in the B group. The C7 translation and L4 tilt shifted to the right in the AR and AL groups, but did not change in the B group. As a result, the L4 tilt (median, 11°) and C7 translation (18.6 mm) tended to be the greatest in the AR group. The incidences of Modic changes at L4/5 discs and ≥3 cm on the visual analogue scale for low back pain were significantly higher in the AR group (77.8% and 54.5%, respectively) compared with that in the other groups. Conclusion. The natural course of compensatory lumbar curves is dependent on the lumbar modifier and direction of L4 tilt. Adolescent patients with right-sided primary thoracic AIS (≥30°) with L4 tilted to the right should be considered for periodic follow-ups into adulthood. Level of Evidence : 4

Idiopathic scoliosis

10.1097/brs.0000000000002779

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Citations (8)

Marriage and childbirth of patients who were surgically and non-surgically treated for adolescent idiopathic scoliosis: a survey at the age of 30 years or older

Spine Deformity (2023)

Masayuki Ohashi Kei Watanabe Tôru Hirano Kazuhiro Hasegawa Keiichi Katsumi

Marital status

Idiopathic scoliosis

10.1007/s43390-023-00648-3

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Citations (2)

Association between Severity of Diffuse Idiopathic Skeletal Hyperostosis and Ossification of Other Spinal Ligaments in Patients with Ossification of the Posterior Longitudinal Ligament

Journal of Clinical Medicine (2021)

Soraya Nishimura Takashi Hirai Narihito Nagoshi Toshitaka Yoshii Jun Hashimoto

Although diffuse idiopathic skeletal hyperostosis (DISH) is known to coexist with the ossification of spinal ligaments (OSLs), details of the radiographic relationship remain unclear.We prospectively collected data of 239 patients with symptomatic cervical ossification of the posterior longitudinal ligament (OPLL) and analyzed the DISH severity on whole-spine computed tomography images, using the following grades: grade 0, no DISH; grade 1, DISH at T3-T10; grade 2, DISH at both T3-T10 and C6-T2 and/or T11-L2; and grade 3, DISH beyond C5 and/or L3. Ossification indices were calculated as the sum of vertebral and intervertebral levels with OSL for each patient.DISH was found in 107 patients (44.8%), 65 (60.7%) of whom had grade 2 DISH. We found significant associations of DISH grade with the indices for cervical OPLL (r = 0.45, p < 0.0001), thoracic ossification of the ligamentum flavum (OLF; r = 0.41, p < 0.0001) and thoracic ossification of the supra/interspinous ligaments (OSIL; r = 0.53, p < 0.0001). DISH grade was also correlated with the index for each OSL in the whole spine (OPLL: r = 0.29, p < 0.0001; OLF: r = 0.40, p < 0.0001; OSIL: r = 0.50, p < 0.0001).The DISH grade correlated with the indices of OSL at each high-prevalence level as well as the whole spine.

Hyperostosis

Anterior longitudinal ligament

Posterior longitudinal ligament

10.3390/jcm10204690

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Citations (3)

Plexiform schwannoma of the forearm

Skeletal Radiology (2003)

Keiichi Katsumi Akira Ogose Tetsuo Hotta Koji Hatano Hiroyuki Kawashima

10.1007/s00256-003-0701-6

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Citations (21)

Spinal fractures in patients with Diffuse idiopathic skeletal hyperostosis:A nationwide multi-institution survey

Journal of Orthopaedic Science (2019)

Eijiro Okada Toshitaka Yoshii Tsuyoshi Yamada Kei Watanabe Keiichi Katsumi

Hyperostosis

Posterior longitudinal ligament

Posterior column

10.1016/j.jos.2018.12.017

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Citations (39)

Surgical Outcomes of Posterior Spinal Fusion Alone Using Cervical Pedicle Screw Constructs for Cervical Disorders Associated With Athetoid Cerebral Palsy

Spine (2017)

Kei Watanabe Tôru Hirano Keiichi Katsumi Masayuki Ohashi Hirokazu Shoji

Study Design. Retrospective case series. Objective. The aim of this study was to investigate clinical outcomes after posterior spinal fusion (PSF) using cervical pedicle screw (CPS) constructs for cervical disorders associated with athetoid cerebral palsy (CP). Summary of Background Data. Traditionally, most patients with cervical myelopathy associated with CP have required combined anterior and posterior fusion to achieve solid stability against severe involuntary movement. Methods. Thirty-one CP patients with cervical disorders who underwent PSF alone with a minimum 2-year follow-up (mean 58 months) were analyzed. All patients were treated with PSF using CPS constructs with or without decompression procedures. The average number of fused segments was 5.1 (range, 1–10 segments), and a halo jacket was applied in 16 patients for at least 2 months after surgery. Clinical outcomes using the Japanese Orthoedic Association scoring system (JOA score) and walking ability, radiographic sagittal alignment, fusion status, and surgery-related complications were evaluated. Results. The JOA score improved from 8.3 points preoperatively to 10.9 points at the final follow-up ( P < 0.05). Although no patients experienced deterioration in their walking ability postoperatively, 10 patients were unable to walk at the final follow-up. Sagittal alignment, including C0-2 angle, C2-7 angle, and local alignment in fused segments, was maintained postoperatively. Twenty-five patients achieved fusion at the final follow-up (fusion rate: 81%), and fivepatients with nonunion required additional surgery. With regard to complications, 5 patients encountered postoperative upper extremity palsy. Conclusion. The CPS construct is amenable to achieve a relatively high fusion rate without correction loss, and good clinical outcomes can be achieved with a posterior single approach for CP patients. In the future, efforts should be made to make appropriate decisions regarding the fusion area, take preventative measures against postoperative upper extremity palsy, and simplify external orthoses after surgery, especially with the use of a halo jacket. Level of Evidence: 4

10.1097/brs.0000000000002257

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Citations (12)

Impact of obesity on cervical ossification of the posterior longitudinal ligament: a nationwide prospective study

Scientific Reports (2022)

Kanji Mori Toshitaka Yoshii Satoru Egawa Kenichiro Sakai Kazuo Kusano

Positive association between ossification of the posterior longitudinal ligament of the spine (OPLL) and obesity is widely recognized; however, few studies focused on the effects of obesity on treatment of cervical OPLL. The effects of obesity on surgical treatment of cervical OPLL were investigated by a Japanese nationwide, prospective study. Overall, 478 patients with cervical myelopathy due to OPLL were prospectively enrolled. To clarify the effects of obesity on the surgical treatment for cervical OPLL, patients were stratified into two groups, non-obese (< BMI 30.0 kg/m2) and obese (≥ BMI 30.0 kg/m2) groups. The mean age of the obese group was significantly younger than that of non-obese group. There were no significant differences between the two groups in other demographic information, medical history, and clinical and radiographical findings. Alternatively, the obese group had a significantly higher rate of surgical site infection (SSI) than that of non-obese group. Approach-specific analyses revealed that the SSI was significantly higher in the obese group than in the non-obese group. A logistic regression analysis revealed that age, BMI, and duration of symptoms were significant factors affecting the postoperative minimum clinically important difference success. The result of this study provides useful information for future cervical OPLL treatment.

Longitudinal Study

10.1038/s41598-022-12625-3

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Citations (3)

Comparison of laminoplasty and posterior fusion surgery for cervical ossification of posterior longitudinal ligament

Scientific Reports (2022)

Hiroaki Nakashima Shiro Imagama Toshitaka Yoshii Satoru Egawa Kenichiro Sakai

Abstract This prospective multicenter study, established by the Japanese Ministry of Health, Labour and Welfare and involving 27 institutions, aimed to compare postoperative outcomes between laminoplasty (LM) and posterior fusion (PF) for cervical ossification of the posterior longitudinal ligament (OPLL), in order to address the controversy surrounding the role of instrumented fusion in cases of posterior surgical decompression for OPLL. 478 patients were considered for participation in the study; from among them, 189 (137 and 52 patients with LM and PF, respectively) were included and evaluated using the Japanese Orthopaedic Association (JOA) scores, the JOA Cervical Myelopathy Evaluation Questionnaire (JOACMEQ), and radiographical measurements. Basic demographic and radiographical data were reviewed, and the propensity to choose a surgical procedure was calculated. Preoperatively, there were no significant differences among the participants in terms of patient backgrounds, radiographical measurements (K-line or cervical alignment on X-ray, OPLL occupation ratio on computed tomography, increased signal intensity change on magnetic resonance imaging), or clinical status (JOA score and JOACMEQ) after adjustments. The overall risk of perioperative complications was found to be lower with LM (odds ratio [OR] 0.40, p = 0.006), and the rate of C5 palsy occurrence was significantly lower with LM (OR 0.11, p = 0.0002) than with PF. The range of motion (20.91° ± 1.05° and 9.38° ± 1.24°, p < 0.0001) in patients who had PF was significantly smaller than in those who had LM. However, multivariable logistic regression analysis showed no significant difference among the participants in JOA score, JOA recovery rate, or JOACMEQ improvement at two years. In contrast, OPLL progression was greater in the LM group than in the PF group (OR 2.73, p = 0.0002). Both LM and PF for cervical myelopathy due to OPLL had resulted in comparable postoperative outcomes at 2 years after surgery.

Laminoplasty

10.1038/s41598-021-04727-1

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Citations (15)

Two-Year Clinical and Radiological Outcomes of Open-Door Cervical Laminoplasty With Prophylactic Bilateral C4–C5 Foraminotomy in a Prospective Study

Spine (2014)

Masayuki Ohashi Akiyoshi Yamazaki Kei Watanabe Keiichi Katsumi Hirokazu Shoji

A prospective study.To evaluate the 2-year outcomes of open-door cervical laminoplasty with prophylactic bilateral C4-C5 foraminotomy.A prospective trial of prophylactic bilateral C4-C5 foraminotomy with open-door laminoplasty for cervical compression myelopathy showed a significant efficacy for preventing postoperative C5 palsy. However, in bilateral foraminotomy, there are concerns such as postoperative instability, hinge fracture, or nonunion, which may cause deterioration of neurological symptoms and neck pain.A prospective trial was performed in 141 patients between 2009 and 2010 (group F). A group of 141 patients who underwent open-door laminoplasty without prophylactic foraminotomy from 2006 to 2008 served as a control group (group NF). Here, we report 2-year radiological and clinical data for 121 patients (follow-up rate: 85.8%) in group F and 115 patients (81.6%) in group NF. The 2 groups were demographically similar, except for the operation time.In group F, the mean rate of facet joint preservation was 71.4%. C2-C7 and C4-C5 lordosis and C4 translational movement were maintained postoperatively in both groups. The range of motion of C2-C7 and C4-C5 significantly decreased to about 80% of the preoperative values in both groups (P < 0.01). These radiological parameters and the incidence of hinge fracture and nonunion did not differ significantly between the groups. Visual analogue scale scores for neck pain were unchanged and significant recoveries (P < 0.001) in Japanese Orthopaedic Association scores were found in both groups. There were no significant differences in these clinical scores between the groups. The incidences of C5 palsy were 1.7% and 7.0% in groups F and NF, respectively (P = 0.043).Prophylactic bilateral C4-C5 foraminotomy did not adversely affect the 2-year radiological and clinical outcomes. Therefore, we conclude that this approach is an effective and desirable procedure for preventing postoperative C5 palsy.3.

Foraminotomy

Laminoplasty

Neck pain

10.1097/brs.0000000000000251

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Citations (33)

Natural history of the ossification of cervical posterior longitudinal ligament: a three dimensional analysis

International Orthopaedics (2017)

Keiichi Katsumi Kei Watanabe Tomohiro Izumi Tôru Hirano Masayuki Ohashi

Univariate analysis

10.1007/s00264-017-3667-z

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Citations (33)