John can't run anymore because his knee joint was injured in a race.

膝关节在某次赛跑中受伤因此不再跑步了。

They conclude that Lucy could straighten her knee joints, enabling her to stand and walk upright as we do and thereby inhabit grasslands, but also that her big, powerful leg muscles helped her live in trees like modern apes.

们得出结论是，露西可以伸直她膝关节，使她能够像我们一站立和直立行走，从而生活在草原上，而且她巨大而有力腿部肌可以帮助她像现代猿类一生活在树上。

Surgery can repair damaged hip and knee joints, but spinal surgery is typically considered risky and is rarely performed.

外科手术可以修复损毁骶髂关节和膝关节，但通常认为脊柱手术风险很大，因此很少进行。

So here's the hip joint here's the knee joint, there's the heel joint.

所以这里是髋关节, 这里是膝关节, 那里是脚后跟关节。

When I don't go to the gym and my leg muscles get a little bit weaker, that puts more pressure on my knee joints because you don't have the muscles to take the pressure off.

当我不去健身房， 腿部肌变得稍微弱一点时，就会给我膝关节带来更大压力， 因为没有足够肌来分散这些压力。

Almost 3% of the young adult and juvenile direwolves that they found showed defects in their knee joints, which tended to be a bit bigger, kind of over like 12 millimeters.

们发现近3%年轻成年和幼年恐狼膝盖关节存在缺陷，这些缺陷通常略大，超过12毫米左右。

John Charnley's revolutionary advances in hip replacement surgery in the early 1960s soon inspired Canadian surgeon Frank Gunston to tackle the challenge of making a knee joint.

20世纪60年代初，约翰·查恩利在髋关节置换手术上革命性进展很激励了加拿大外科医生弗兰克·冈斯顿，决心攻克制造膝关节挑战。

When I went for a walk, I didn't leak join fluid from my knees, " joint fluid." Why was menstruation so different?

当我出去散步时， 我膝盖不会渗出关节液。为什么月经就那么不一？

The idea is that when you run, the flexible, tough tissue that cushions your knee joints, called cartilage, takes a pounding.

想法是， 当你跑步时，作为缓冲膝盖关节灵活坚韧组织——软骨——会受到冲击。

It's been found that a one pound weight loss can equal a 4 pound reduction in knee joint stress.

研究发现，体重减轻 1 磅相当于膝关节压力减轻 4 磅。

Synthetic knee joints may give off particles as they’re worn down, causing immune cells to inflame around these fragments.

合成膝关节在磨损时可能会释放出颗粒，导致这些碎片周围免疫细胞发炎。

Well that's what these girls were doing, except they were cracking their knee joints, which sounds a little painful.

好吧， 这两个女孩就是这么做， 不过她们是发出膝盖关节声音，这听起来有点疼。

The machines are humming away as they steadily make orthopedic implants such as replacement, hip and knee joints.

机器正嗡嗡作响，稳步生产着骨科植入物，如髋关节和膝关节置换部件。

Archaeologists had uncovered a knee joint that was too large and strange to belong to any known creature.

考古学家发现了一个膝盖关节，其尺寸之大和形态之奇特，不属于任何已知生物。

Wow! She is really hyper flexible. It's hypermobility, not just in the knee joint, but in the hip joint as well. Cause to do that whole rotation there, I could see that causing a significant problem medically down the line.

哇 她真超灵活 这是关节过度活动综合征 不仅是膝关节 髋关节也是 因为这一整套旋转动作做下来 我可以预料这下去会导致一个重大医学问题。

For example, early accounts of the birds mention how slow and clumsy it was, but scientists now believe the bird's strong knee joints would have made it capable of movement which was not slow, but actually quite fast.

例如，早期关于这种鸟报道提到了它是多么缓慢和笨拙，但科学家们现在相信，这种鸟强壮膝关节会使它能够进行不慢但实际上相当运动。

The unstable surface forces her ankle and knee joints to work harder to keep her body steady, which is vital for maintaining balance during fast movements.

不稳定表面迫使她脚踝和膝关节更加努力地工作以保持身体稳定，这对于在速运动中保持平衡至关重要。

By looking at the articulations, that is where two bones are in contact with one another like at this knee joint.

通过观察关节，这就是两块骨头相互接触地方，就像这个膝关节一。

They started each session collecting a blood sample, and a bit of synovial fluid, the natural lubricant inside the knee joint.

们在每次训练开始时采集血和少量滑液，滑液是膝关节内天然润滑剂。

They would, what we would call " crack" certain parts of their body – their toes and especially their knee joints.

们会弄出一些我们称之为“关节弹响”声音——们脚趾和尤其是膝盖关节。