Fig. 6
Pressure pain threshold, thermal pain threshold and histopathological detection of knee cartilage in rats. A Pressure pain threshold measurement in rats at week 2 after modeling; B pressure pain threshold determination in rats at week 3 after modeling; C determination of pressure pain threshold in rats at week 4 after modeling; D determination of thermal pain threshold in rats at week 2 after modeling; E determination of thermal pain threshold in rats at week 3 after modeling; F determination of thermal pain threshold in rats at week 4 after modeling; G Safranine O staining of rat knee joint cartilage tissue (50×); H immunohistochemical staining of IL-6 (40×); I Mankin’s score for histopathology of rat knee joint cartilage; J analysis of IL-6 expression in cartilage tissues of rat knee joints