Fig. 7

Apoptosis fluorescence staining of chondrocytes in the bilateral knee joints of micein groups.(Scale bar = 30 μm). (A). female control group; (B). ovariectomized group; (C). ovariectomized group supplemented with estrogen; and (D). male group; Sham, sham operation; DMM, medial meniscus instability operation; Ipsilateral comparison between groups B, D, and A (** P < 0.01). Ipsilateral comparison between groups C and B (## P < 0.01)