Masato Tanaka
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Masato Tanaka has a total of 9 co-authors. Here are the top co-authors by number of shared publications:
- Adriano Doană-Prodan
Department of Rehabilitation, Okayama Rosai Hospital, Okayama, Japan
1 shared publication - Akiyoshi Miyamoto
Department of Orthopaedic Surgery, Okayama Rosai Hospital, Okayama, Japan
1 shared publication - Boon Jein Chen
Department of Orthopaedic Surgery, Okayama Rosai Hospital, Okayama, Japan
1 shared publication - Kazuhiko Takamatsu
Department of Rehabilitation, Okayama Rosai Hospital, Okayama, Japan
1 shared publication - Mandar Borde
Department of Orthopaedic Surgery, Okayama Rosai Hospital, Okayama, Japan
1 shared publication - Shinya Arataki
Department of Orthopaedic Surgery, Okayama Rosai Hospital, Okayama, Japan
1 shared publication
Latest Publications
- Open Access
- 31 October 2026
- Published by Asian Spine Journal (ASJ) in Asian Spine Journal
- Vol. 20 (5) , 939-946
Preoperative erector spinae muscle quality is more important than leg muscle quality for postoperative walking recovery in lumbar spinal stenosis: a retrospective study in Japanese patients
Study Design: Retrospective cohort study.Purpose: To determine whether preoperative trunk and lower limb muscle quality predicts achievement of the minimal clinically important difference (MCID) in the 6-minute walk distance (6MWD) after lumbar spinal stenosis (LSS) surgery.Overview of Literature: LSS commonly causes intermittent claudication and reduced walking ability. Previous studies have suggested that muscle quality affects postoperative recovery, but its association with clinically meaningful improvements in the 6MWD remains unclear.Methods: This retrospective study included 150 patients aged ≥60 years who underwent decompression or fusion surgery for LSS at Okayama Rosai Hospital between April 2021 and April 2023. Preoperative assessments included demographic and surgical factors, Zurich Claudication Questionnaire (ZCQ) scores, visual analog scale scores, the 6MWD, and computed tomography-based muscle quality. The functional cross-sectional areas of the psoas major, erector spinae (ES), multifidus, gluteus maximus, and gluteus medius were quantified in Hounsfield units. Muscle quality was expressed as the low-attenuation muscle area (LAMA) ratio. Patients were classified according to whether they achieved the MCID (80 m) in the postoperative 6MWD. Logistic regression analyses were used to identify predictors of the achievement of the MCID.Results: Among the 150 patients, 86 (57%) achieved the MCID. Univariate analysis showed that younger age, higher preoperative ZCQ scores, a shorter 6MWD, and lower LAMA ratios of all examined muscles were significantly associated with the achievement of the MCID in postoperative walking ability. In multivariate analysis, younger age (p <0.001), a shorter preoperative 6MWD (p =0.016), and a lower ES LAMA ratio (p <0.001) remained independent predictors. These results indicate that better preoperative ES muscle quality independently contributes to postoperative walking recovery in patients with LSS.Conclusions: Preoperative younger age, shorter 6MWD, and lower ES LAMA ratio independently predicted meaningful postoperative improvement in walking. Enhancing preoperative ES muscle quality is crucial for postoperative walking recovery in patients with LSS.
- 31 October 2026
- Published by Asian Spine Journal (ASJ) in Asian Spine Journal
- Vol. 20 (5) , 939-946
Open AccessPreoperative erector spinae muscle quality is more important than leg muscle quality for postoperative walking recovery in lumbar spinal stenosis: a retrospective study in Japanese patients
Study Design: Retrospective cohort study.Purpose: To determine whether preoperative trunk and lower limb muscle quality predicts achievement of the minimal clinically important difference (MCID) in the 6-minute walk distance (6MWD) after lumbar spinal stenosis (LSS) surgery.Overview of Literature: LSS commonly causes intermittent claudication and reduced walking ability. Previous studies have suggested that muscle quality affects postoperative recovery, but its association with clinically meaningful improvements in the 6MWD remains unclear.Methods: This retrospective study included 150 patients aged ≥60 years who underwent decompression or fusion surgery for LSS at Okayama Rosai Hospital between April 2021 and April 2023. Preoperative assessments included demographic and surgical factors, Zurich Claudication Questionnaire (ZCQ) scores, visual analog scale scores, the 6MWD, and computed tomography-based muscle quality. The functional cross-sectional areas of the psoas major, erector spinae (ES), multifidus, gluteus maximus, and gluteus medius were quantified in Hounsfield units. Muscle quality was expressed as the low-attenuation muscle area (LAMA) ratio. Patients were classified according to whether they achieved the MCID (80 m) in the postoperative 6MWD. Logistic regression analyses were used to identify predictors of the achievement of the MCID.Results: Among the 150 patients, 86 (57%) achieved the MCID. Univariate analysis showed that younger age, higher preoperative ZCQ scores, a shorter 6MWD, and lower LAMA ratios of all examined muscles were significantly associated with the achievement of the MCID in postoperative walking ability. In multivariate analysis, younger age (p <0.001), a shorter preoperative 6MWD (p =0.016), and a lower ES LAMA ratio (p <0.001) remained independent predictors. These results indicate that better preoperative ES muscle quality independently contributes to postoperative walking recovery in patients with LSS.Conclusions: Preoperative younger age, shorter 6MWD, and lower ES LAMA ratio independently predicted meaningful postoperative improvement in walking. Enhancing preoperative ES muscle quality is crucial for postoperative walking recovery in patients with LSS.