Rather, they are generally the result of repeated mechanical stress to a vulnerable, weight-bearing bone, such as those in the feet.

相反，它是承重骨骼机械性疲劳过度的产物，比如那些足部骨骼。

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And the stress of spaceflight, combined with the negative effects of weightlessness on muscle and bone, could cause real problems.

然而来自航天的压力，再加上失重对肌肉和骨骼造成的不利影响，会导致严重的问题。

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This results in uneven distribution of stress transmission to deeper layers of cartilage and to the underlying subchondral bone.

这导致应力分布不均匀地传导至深层软骨及其下面的软骨下骨。

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"We think because of the long term effect of the bone, there may be stress fractures that are not repairing and I think the bone is becoming brittle, and it's not exactly as if it occurs without any warning, but it occurs suddenly with minimal trauma."

VOA: standard.2010.03.14

The combination of positive stress on bone from aerobic and strength training leads to stronger, denser and more functional bone.

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They've offered bone-density scans, stress tests measuring oxygen consumption and the like, says Liponis.

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Deng had to pull out of the Eurobasket tournament, where his British teammates are competing in Bulgaria between September 7-20, due to a stress fracture to a bone in his leg, an injury that kept him out of action for much of last season.

CNN: The Luol Deng lowdown