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. 2022 Jun 15;13:897439. doi: 10.3389/fendo.2022.897439

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Copyright © 2022 Wen, Li, Cai, Fan, Wang, Ding, Huang and Xiao

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Co-occurrence analysis of global publications in ONFH in the last 30 years. (A) Network visualization of 515 identified keywords in ONFH. All the keywords are divided into 5 clusters: “Mechanism study”, “Treatment study”, “Complication study”, “Radiological study” and “Etiological study”. (B) Overlay visualization of the 515 identified keywords in ONFH based on the average time they appeared in the publications. The blue keyword appeared earlier, while the yellow keyword appeared later.