Knee injuries, especially to the anterior cruciate ligament (ACL), are some of the most common and serious, the new study found.

新的研究发现，膝盖受伤，特别是前十字韧带(ACL)受伤，是最普遍和最严重的。

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As you begin to bend forward, the spine moves while the pelvis and sacrum tend to remain behind, especially on the side with the knee drawn back.

当你上体前屈时，脊椎向前移动，但骨盆和骶骨却要保持在原处，特别是屈膝的一侧。

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Many treadmills are padded, making them a good option if you're overweight or are injury-prone (especially with knee issues) and want to decrease the impact.

许多跑步机都是平的，这让他们成为一个很好的选择如果你是超重或者是容易受伤的特别是有膝盖问题的，并且想要减小影响。

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In order to facilitate cartilage repair, especially in knee injuries, the cartilage is typically replaced.

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"The medical device business, especially the hip and knee replacement business, has been an outstanding business, " Schiff admits.

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"You can see in her right knee, especially on the medial side, she has no space left between her femur and her tibia, " he said.

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