Hiroyuki Oka

13.7k total citations · 2 hit papers
465 papers, 9.7k citations indexed

About

Hiroyuki Oka is a scholar working on Surgery, Pharmacology and Pathology and Forensic Medicine. According to data from OpenAlex, Hiroyuki Oka has authored 465 papers receiving a total of 9.7k indexed citations (citations by other indexed papers that have themselves been cited), including 180 papers in Surgery, 103 papers in Pharmacology and 98 papers in Pathology and Forensic Medicine. Recurrent topics in Hiroyuki Oka's work include Musculoskeletal pain and rehabilitation (100 papers), Spine and Intervertebral Disc Pathology (86 papers) and Scoliosis diagnosis and treatment (47 papers). Hiroyuki Oka is often cited by papers focused on Musculoskeletal pain and rehabilitation (100 papers), Spine and Intervertebral Disc Pathology (86 papers) and Scoliosis diagnosis and treatment (47 papers). Hiroyuki Oka collaborates with scholars based in Japan, United States and United Kingdom. Hiroyuki Oka's co-authors include Shigeyuki Muraki, Hiroshi Kawaguchi, Toru Akune, Noriko Yoshimura, Sakae Tanaka, Kozo Nakamura, Kentaro Nakamura, Munehito Yoshida, Ko Matsudaira and Yoshio Enyo and has published in prestigious journals such as Angewandte Chemie International Edition, Circulation and SHILAP Revista de lepidopterología.

In The Last Decade

Hiroyuki Oka

430 papers receiving 9.5k 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 of knee osteoarthritis, lumbar spondylosis, and osteoporosis in Japanese men and women: the research on osteoarthritis/osteoporosis against disability study

2009 606 citations Noriko Yoshimura, Shigeyuki Muraki et al. profile →
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

Countries citing papers authored by Hiroyuki Oka

Since Specialization

Citations

This map shows the geographic impact of Hiroyuki Oka'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 Hiroyuki Oka with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Hiroyuki Oka more than expected).

Fields of papers citing papers by Hiroyuki Oka

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Hiroyuki Oka. 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 Hiroyuki Oka. The network helps show where Hiroyuki Oka may publish in the future.

Co-authorship network of co-authors of Hiroyuki Oka

This figure shows the co-authorship network connecting the top 25 collaborators of Hiroyuki Oka. A scholar is included among the top collaborators of Hiroyuki Oka 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 Hiroyuki Oka. Hiroyuki Oka 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

#	Work	Indexed citations
1	Association between vertebral fractures and brain volume: insights from a community cohort study 2025 ·Osteoporosis International ·Koji Nakajima, Chiaki Horii, (unknown), (unknown), Akitoshi Ogawa, Takahiro Osada, Seiki Konishi, (unknown), Toshiko Iidaka, Shigeyuki Muraki, Hiroyuki Oka, Hiroshi Kawaguchi, (unknown), Hiroshi Hashizume, Hiroshi Yamada, Munehito Yoshida, (unknown), Masaaki Shojima, (unknown), Noriko Yoshimura	0
2	Helicobacter pylori-Related Chronic Gastritis as a Risk Factor for Lower Bone Mineral Density 2025 ·Calcified Tissue International ·Izumi Inoue, Noriko Yoshimura, Toshiko Iidaka, Chiaki Horii, Shigeyuki Muraki, Hiroyuki Oka, Hiroshi Kawaguchi, Toru Akune, Takao Maekita, Kanae Mure, Kozo Nakamura, Sakae Tanaka, Satoshi Mochida, Masao Ichinose	0
3	The Association Between Serum Ergothioneine Concentration and Japanese Dietary Habits: The Third Survey of the ROAD Study 2025 ·Nutrients ·(unknown), Yoshihisa Kaneda, Takayuki Izumo, Yoshihiro Nakao, Toshiko Iidaka, Chiaki Horii, Shigeyuki Muraki, Hiroyuki Oka, Hiroshi Kawaguchi, (unknown), Hiroshi Hashizume, Hiroshi Yamada, K. Nakamura, Sakae Tanaka, Noriko Yoshimura	3
4	Ten-Year Incidence of Sarcopenia in a Population-Based Cohort: Results from the Research on Osteoarthritis/Osteoporosis Against Disability Study 2024 ·Journal of the American Medical Directors Association ·Toshiko Iidaka, Chiaki Horii, (unknown), Shigeyuki Muraki, Hiroyuki Oka, Hiroshi Kawaguchi, Kozo Nakamura, Toru Akune, Sakae Tanaka, Noriko Yoshimura	2
5	Osteoporosis, spinal degenerative disorders, and their association with low back pain, activities of daily living, and physical performance in a general population 2024 ·Scientific Reports ·(unknown), Hiroshi Hashizume, Noriko Yoshimura, Hiroyuki Oka, (unknown), Yuyu Ishimoto, Keiji Nagata, Masatoshi Teraguchi, Ryohei Kagotani, (unknown), Sakae Tanaka, Munehito Yoshida, H. Yamada	7
6	Relationship between medial partite hallux sesamoid and hallux valgus in the general population 2023 ·Foot and Ankle Surgery ·(unknown), Takumi Matsumoto, (unknown), (unknown), Toshiko Iidaka, Chiaki Horii, Hiroyuki Oka, Shigeyuki Muraki, Hiroshi Hashizume, Hiroshi Yamada, Munehito Yoshida, Kozo Nakamura, Sakae Tanaka, Noriko Yoshimura	2
7	Changes in knee joint destruction patterns among patients with rheumatoid arthritis undergoing total knee arthroplasty in recent decades 2023 ·Clinical Rheumatology ·(unknown), Takumi Matsumoto, Yasunori Omata, Hiroshi Inui, Shuji Taketomi, Yuichi Nagase, (unknown), Hiroyuki Oka, Sakae Tanaka	6
8	Association Between Deep Posterior Cervical Paraspinal Muscle Morphology and Clinical Features in Patients With Cervical Ossification of the Posterior Longitudinal Ligament 2021 ·Global Spine Journal ·Tôru Doi, (unknown), (unknown), (unknown), (unknown), Koji Nakajima, (unknown), Naoki Okamoto, Hideki Nakamoto, So Kato, Yuki Taniguchi, Yoshitaka Matsubayashi, Hiroyuki Oka, Ko Matsudaira, Sakae Tanaka, Yasushi Oshima	11
9	Presenteeism and Associated Factors Among Nursing Personnel with Low Back Pain: A Cross-Sectional Study 2020 ·SHILAP Revista de lepidopterología ·Takahiko Yoshimoto, Hiroyuki Oka, Hirotaka Ochiai, Shuhei Ishikawa, Akatsuki Kokaze, (unknown), Ko Matsudaira	2
10	<p>Presenteeism and Associated Factors Among Nursing Personnel with Low Back Pain: A Cross-Sectional Study</p> 2020 ·Journal of Pain Research ·Takahiko Yoshimoto, Hiroyuki Oka, Hirotaka Ochiai, Shuhei Ishikawa, Akatsuki Kokaze, (unknown), Ko Matsudaira	14
11	Survey on chronic disabling low back pain among care workers at nursing care facilities: a multicenter collaborative cross-sectional study 2019 ·SHILAP Revista de lepidopterología ·Takahiko Yoshimoto, Hiroyuki Oka, Tomoko Fujii, K. Kawamata, Akatsuki Kokaze, Yoshiyuki Koyama, Ko Matsudaira	1
12	Prevalence of Facet Effusion and Its Relationship with Lumbar Spondylolisthesis and Low Back Pain: The Wakayama Spine Study 2019 ·SHILAP Revista de lepidopterología ·(unknown), (unknown), (unknown), Hiroyuki Oka, (unknown), (unknown), (unknown), (unknown), (unknown), (unknown), (unknown), (unknown), (unknown), (unknown), (unknown), (unknown), (unknown), (unknown)	2
13	Efficacy and safety of trabectedin for patients with unresectable and relapsed soft‐tissue sarcoma in Japan: A Japanese Musculoskeletal Oncology Group study 2019 ·Cancer ·Hiroshi Kobayashi, Shintaro Iwata, Toru Wakamatsu, Keiko Hayakawa, Tsukasa Yonemoto, Junji Wasa, Hiroyuki Oka, Takafumi Ueda, Sakae Tanaka	28
14	Relationship between X-ray findings of lumbar spondylosis and knee pain 2019 ·BMC Musculoskeletal Disorders ·Kosuke Uehara, Masami Akai, Tokuhide Doi, Hiroyuki Oka, Tsutomu Iwaya	4
15	<p>Prevalence of Facet Effusion and Its Relationship with Lumbar Spondylolisthesis and Low Back Pain: The Wakayama Spine Study</p> 2019 ·Journal of Pain Research ·(unknown), Akihito Minamide, Hiroshi Hashizume, Hiroyuki Oka, Ko Matsudaira, (unknown), Yuyu Ishimoto, Masatoshi Teraguchi, Ryohei Kagotani, Yoshiki Asai, Shigeyuki Muraki, Toru Akune, Sakae Tanaka, Hiroshi Kawaguchi, Kozo Nakamura, Munehito Yoshida, Noriko Yoshimura, Hiroshi Yamada	13
16	The utility of 25-question Geriatric Locomotive Function Scale for evaluating functional ability and disease activity in Japanese rheumatoid arthritis patients: A cross-sectional study using NinJa database 2018 ·Modern Rheumatology ·Naohiro Izawa, Jun Hirose, Tomoko Fujii, Hiroyuki Oka, Kosuke Uehara, Masashi Naito, Takumi Matsumoto, Sakae Tanaka, Shigeto Tohma	20
17	Acute Hepatitis Outbreak in Tokyo Caused by Hepatitis A Virus of Common Origin Transmitted through Oral and Sexual Routes 2000 ·Japanese Journal of Infectious Diseases ·(unknown), Hiroyuki Oka, Masako Asayama, (unknown), Hiroko Yamashita, Natsuo Tachikawa, Junichi Akiyama, Akira Yasuoka, Shinichi Oka, Shigeru Yamato, (unknown), (unknown), Naohiko Masaki, Kei Matsueda, (unknown), Shigeki Hayashi	5
18	[Randomized controlled study on adjuvant immunochemotherapy with PSK in curatively resected colorectal cancer. The Cooperative Study Group of Surgical Adjuvant Immunochemotherapy for Cancer of Colon and Rectum]. 1989 ·PubMed ·Toshio Mitomi, (unknown), (unknown), (unknown), Kazufumi Suzuki, K Nishiyama, Toraji Amano, Toshio Takahashi, (unknown), Hiroyuki Oka	21
19	ELECTRONIC ENDOSCOPY OF THE GASTROINTESTINAL TRACT WITH VIDEOENDOSCOPE SYSTEM 1986 ·Acta gastro-enterologica belgica ·(unknown), Katsuyoshi Hayashi, (unknown), (unknown), Kazuo Abe, Kiyoshi Ashida, (unknown), Chikao Shimamoto, Hiroyuki Oka, Hirofumi Miyoshi, Saburo Ohshiba	2
20	[Familial motor neuron disease: Autopsy findings in one of two brothers (author's transl)]. 1977 ·Munich Personal RePEc Archive (Ludwig Maximilian University of Munich) ·F Yoshimasu, (unknown), Takuo Hayashi, (unknown), Hiroyuki Oka	2

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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