Bibliometric and Visualized Analyses of Research Studies on Different Analgesics in the Treatment of Orthopedic Postoperative Pain

Figure 7

Keywords co-occurrence overlay mapping on analgesics in the treatment of orthopedic postoperative pain. Each frame indicates a keyword. The rainbow color marks the average publication year from violet (further year) to yellow (recent year) in the range of spectrum. The larger scale of a keyword is according to the higher frequency, while the closer distance between the two keywords represents the stronger co-occurrence.