Fig. 6

Co-occurrence analysis on TKA research. a Mapping of keywords on TKA research; the size of nodes represents the frequency, while the lines between nodes reflect the co-occurrence relationship. A total of 2225 included keywords are divided into 5 clusters: alignment study (color green), revision TKA study (color blue), complication study (color red), rehabilitation study (color yellow), and perioperative management study (color purple). b Distribution of keywords according to the frequency of appearance. The color blue indicates the keywords appear earlier, whereas the color red reflects the later occurrence