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

他的膝关节在某次赛跑中受伤因此不再跑步了。

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的骶髂关节和膝关节，但通常认为脊柱手术的风险很大，因此很少进行。

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

所以里髋关节, 里膝关节, 那里脚后跟关节。

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。

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粒，导致些碎片周围的免细胞发炎。

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

好吧， 两个女孩么做的， 不过她们发膝盖关节的声音，听起来有点疼。

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

想法， 当你跑步时，作为缓冲膝盖关节的灵活坚韧组织——软骨——会受到冲击。

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

他们在每次训练开始时采集血样和少量滑液，滑液膝关节内的天然润滑剂。

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

他们会弄一些我们称之为“关节弹响”的声音——他们的脚趾和尤其膝盖关节。

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，两块骨头相互接触的地方，像个膝关节一样。

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

当我去散步时， 我的膝盖不会渗关节液。为什么月经那么不一样呢？

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.

不稳定的表面迫使她的脚踝和膝关节更加努力地工作以保持身体稳定，对于在快速运动中保持平衡至关重要。

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的革命性进展很快激励了加拿大外科医生弗兰克·冈斯顿，他决心攻克制造膝关节的挑战。

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.

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

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.

他们得的结论，露西可以伸直她的膝关节，使她能够像我们一样站立和直立行走，从而生活在草原上，而且她巨大而有力的腿部肌肉可以帮助她像现代猿类一样生活在树上。

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， 腿部肌肉变得稍微弱一点时，会给我的膝关节带来更大的压力， 因为没有足够的肌肉来分散些压力。

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，早期关于种鸟的报道提到了它多么的缓慢和笨拙，但科学家们现在相信，种鸟强壮的膝关节会使它能够进行不慢但实际上相当快的运动。

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 她真的超灵活 关节过度活动综合征 不仅膝关节 髋关节也 因为一整套旋转动作做下来 我可以预料样下去会导致一个重大的医学问题。