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. 2024 Oct 30;9:37. doi: 10.21037/aoj-24-6

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Effect of weightlessness on cartilage biomechanics. Reduced modulus (A) and hardness (B) of articular cartilage. (C) Micro-scanning of nanoindentation. “a” indicates a significant difference from the N group and “b” indicates a significant difference from the S2 group. N, ground group; S2, 14-day hindlimb unloading group; S4, 28-day hindlimb unloading group.