Fig 4. Histologic response of synovium to joint injury.

(A) Photomicrographs of synovial biopsies obtained from intact controls and from knees at 14 days following injury, demonstrate an increased total cellularity at 14 days post-injury. Bars = 100 μm. (B) Symbols represent individual specimens, horizontal lines indicate the mean, and vertical bars indicate 95% confidence intervals. Magenta dots are corresponding to the selected photomicrographs, i.e. representing the median total cellularity of the respective time-points. * p < .05.