Keiji Nagata

2.9k total citations · 1 hit paper
89 papers, 1.9k citations indexed

About

Keiji Nagata is a scholar working on Surgery, Pathology and Forensic Medicine and Pharmacology. According to data from OpenAlex, Keiji Nagata has authored 89 papers receiving a total of 1.9k indexed citations (citations by other indexed papers that have themselves been cited), including 61 papers in Surgery, 52 papers in Pathology and Forensic Medicine and 32 papers in Pharmacology. Recurrent topics in Keiji Nagata's work include Spine and Intervertebral Disc Pathology (48 papers), Scoliosis diagnosis and treatment (29 papers) and Musculoskeletal pain and rehabilitation (28 papers). Keiji Nagata is often cited by papers focused on Spine and Intervertebral Disc Pathology (48 papers), Scoliosis diagnosis and treatment (29 papers) and Musculoskeletal pain and rehabilitation (28 papers). Keiji Nagata collaborates with scholars based in Japan, United States and United Kingdom. Keiji Nagata's co-authors include Yuyu Ishimoto, Hiroyuki Oka, Shigeyuki Muraki, Toru Akune, Hiroshi Yamada, Hiroshi Hashizume, Hiroshi Kawaguchi, Akihito Minamide, Noriko Yoshimura and Munehito Yoshida and has published in prestigious journals such as PLoS ONE, Scientific Reports and Spine.

In The Last Decade

Keiji Nagata

77 papers receiving 1.9k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Prevalence and distribution of intervertebral disc degeneration over the entire spine in a population-based cohort: the Wakayama Spine Study

2013 347 citations Masatoshi Teraguchi, Noriko Yoshimura et al. profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Keiji Nagata Japan	21	1.3k	1.1k	869	310	280	89	1.9k
Yuyu Ishimoto Japan	20	1.2k 1.0×	999 0.9×	848 1.0×	310 1.0×	299 1.1×	63	1.9k
Masahito Yoshida Japan	18	799 0.6×	1.1k 1.0×	677 0.8×	338 1.1×	441 1.6×	64	1.9k
Yoshio Enyo Japan	21	533 0.4×	1.0k 0.9×	590 0.7×	345 1.1×	800 2.9×	42	1.9k
Masatoshi Teraguchi Japan	17	949 0.7×	671 0.6×	692 0.8×	259 0.8×	243 0.9×	62	1.3k
Stéphane Genevay Switzerland	22	891 0.7×	509 0.5×	1.1k 1.2×	113 0.4×	232 0.8×	96	1.7k
Eero Kyllönen Finland	17	1.1k 0.9×	650 0.6×	895 1.0×	202 0.7×	168 0.6×	29	1.7k
Ryohei Kagotani Japan	15	832 0.6×	614 0.6×	589 0.7×	212 0.7×	251 0.9×	28	1.2k
Akihiko Saika Japan	8	250 0.2×	633 0.6×	448 0.5×	286 0.9×	597 2.1×	10	1.3k
Donald R. Gore United States	21	1.5k 1.1×	2.0k 1.8×	501 0.6×	176 0.6×	94 0.3×	41	2.5k
Masaaki Machino Japan	28	1.9k 1.5×	2.5k 2.2×	208 0.2×	204 0.7×	74 0.3×	200	3.1k

Countries citing papers authored by Keiji Nagata

Since Specialization

Citations

This map shows the geographic impact of Keiji Nagata's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Keiji Nagata with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Keiji Nagata more than expected).

Fields of papers citing papers by Keiji Nagata

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Keiji Nagata. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Keiji Nagata. The network helps show where Keiji Nagata may publish in the future.

Co-authorship network of co-authors of Keiji Nagata

This figure shows the co-authorship network connecting the top 25 collaborators of Keiji Nagata. A scholar is included among the top collaborators of Keiji Nagata based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Keiji Nagata. Keiji Nagata is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Hashizume, Hiroshi, Kanae Mure, Hiroyuki Oka, et al.. (2025). Long-Term Prognosis and Risk Factors for Low Back Pain-Related Disorders in the General Population: A 7-Year Follow-Up of the Wakayama Spine Study. Spine Surgery and Related Research. 9(6). 658–665.

Fujikawa, Takahisa, et al.. (2025). Safety and Feasibility of Microporous Polysaccharide Hemosphere Absorbable Hemostat in Robotic Liver Resection: A Single-Center Retrospective Cohort Study. Cureus. 17(11). e97384–e97384.

Nagata, Keiji, et al.. (2024). The effect of anticoagulation therapy on the surgical outcomes of minimally invasive major gastrointestinal surgery. Surgical Endoscopy. 39(2). 1016–1024. 1 indexed citations

Nagata, Keiji, Kojiro Nakamura, Taku Iida, et al.. (2024). A case of spindle and giant cell-type undifferentiated carcinoma of the extrahepatic bile duct. Clinical Journal of Gastroenterology. 17(2). 345–351.

Hashizume, Hiroshi, Noriko Yoshimura, Hiroyuki Oka, et al.. (2024). Osteoporosis, spinal degenerative disorders, and their association with low back pain, activities of daily living, and physical performance in a general population. Scientific Reports. 14(1). 15860–15860. 7 indexed citations

Tsutsui, Shunji, Hiroshi Hashizume, Hiroshi Iwasaki, et al.. (2024). Long-term Outcomes After Adult Spinal Deformity Surgery Using Lateral Interbody Fusion. Clinical Spine Surgery A Spine Publication. 37(8). E371–E376. 1 indexed citations

Tsutsui, Shunji, Hiroshi Hashizume, Hiroshi Iwasaki, et al.. (2024). Willingness to undergo the same surgery again among older patients who have undergone corrective fusion surgery for adult spinal deformity. Journal of Clinical Neuroscience. 127. 110761–110761. 2 indexed citations

Takami, Masanari, Shunji Tsutsui, Motohiro Okada, et al.. (2023). Unique Characteristics of New Bone Formation Induced by Lateral Lumbar Interbody Fusion Procedure. Spine Surgery and Related Research. 7(5). 450–457. 1 indexed citations

Teraguchi, Masatoshi, Hiroshi Hashizume, Hiroyuki Oka, et al.. (2023). Prevalence and distribution of Schmorl node and endplate signal change, and correlation with disc degeneration in a population-based cohort: the Wakayama Spine Study. European Spine Journal. 33(1). 103–110. 3 indexed citations

10.

Takami, Masanari, Hiroshi Iwasaki, Hiroshi Hashizume, et al.. (2023). Outcomes and Vertebral Osteophytes and Bulging Intervertebral Discs Occupancy as a Decision-Making Tool for Surgical Success in Patients Undergoing Microendoscopic Foraminotomy for Lumbar Foraminal Stenosis. World Neurosurgery. 182. e570–e578. 1 indexed citations

11.

Yamashita, Masashi, Keiji Nagata, Masanari Takami, et al.. (2022). Mortality and complications in elderly patients with cervical spine injuries. Injury. 53(6). 2114–2120. 4 indexed citations

12.

Hashizume, Hiroshi, Keiji Nagata, Yasutsugu Yukawa, et al.. (2021). Kitchen elbow sign predicts surgical outcomes in adults with spinal deformity: a retrospective cohort study. Scientific Reports. 11(1). 12859–12859. 5 indexed citations

13.

Kanazawa, Ayako, Hideaki Arai, Keiji Nagata, et al.. (2017). A Case of Infectious Enterocolitis with Hyperammonemia. Journal of UOEH. 39(4). 271–276. 5 indexed citations

14.

Muraki, Shigeyuki, Toru Akune, Keiji Nagata, et al.. (2014). Association of knee osteoarthritis with onset and resolution of pain and physical functional disability: The ROAD study. Modern Rheumatology. 24(6). 966–973. 8 indexed citations

15.

Nagata, Keiji, Noriko Yoshimura, Hiroshi Hashizume, et al.. (2014). The prevalence of cervical myelopathy among subjects with narrow cervical spinal canal in a population-based magnetic resonance imaging study: the Wakayama Spine Study. The Spine Journal. 14(12). 2811–2817. 42 indexed citations

16.

Yoshimura, Noriko, Keiji Nagata, Shigeyuki Muraki, et al.. (2013). Prevalence and progression of radiographic ossification of the posterior longitudinal ligament and associated factors in the Japanese population: a 3-year follow-up of the ROAD study. Osteoporosis International. 25(3). 1089–1098. 61 indexed citations

17.

Muraki, Shigeyuki, Toru Akune, Yuyu Ishimoto, et al.. (2012). Risk factors for falls in a longitudinal population-based cohort study of Japanese men and women: The ROAD Study. Bone. 52(1). 516–523. 47 indexed citations

18.

Muraki, Shigeyuki, Toru Akune, Hiroyuki Oka, et al.. (2011). Incidence and risk factors for radiographic knee osteoarthritis and knee pain in Japanese men and women: A longitudinal population‐based cohort study. Arthritis & Rheumatism. 64(5). 1447–1456. 103 indexed citations

19.

Nagata, Keiji, et al.. (1999). Spondylolysis at Three Sites in the Same Lumbar Vertebra. International Journal of Sports Medicine. 20(1). 56–57. 1 indexed citations

20.

Nagata, Keiji, et al.. (1979). [A clinical observation of cefuroxime in pediatric field (author's transl)].. Munich Personal RePEc Archive (Ludwig Maximilian University of Munich). 32(11). 1117–21. 2 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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