Has the bacteriology of periprosthetic joint infection after total knee arthroplasty changed over time? A retrospective cohort study of 2171 patients. - Khoo JR; Chan PK; Leung JHY; Chan VWK; Cheung A; Luk MH; Cheung MH; Fu H; Chiu KY (Hong Kong medical journal = Xianggang yi xue za zhi, 2026)