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Lactate dehydrogenase (LDH) cytotoxicity assay for the osteoarthritis-derived (OA) chondrocytes under mechanical stretch. The rate of dead cells under mechanical stretch significantly increased when compared to that noted in the group without mechanical force. Results represent mean ± SD. NS, not significant at P>0.05, the mechanical stretch group vs. the blank group; *P<0.05 and **P<0.01, the mechanical stretch group vs. the blank group; OD, optical density.
