The old man, losing his head, breathless, gasping, dislocated his stiff joints in his efforts.

这老头儿着了慌，气也透不过来，呼呼地直喘，因为用了力，僵硬的关节差一点脱臼。

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Ahava's muscle Soothing Eucalyptus Mineral Bath Salts relax tight muscles and help stiff joints with the benefits of magnesium, calcium, sodium and potassium.

艾哈佛的肌肉舒缓桉树矿物浴盐放松紧绷的肌肉和关节僵硬，镁，钙，钠和钾的好处。

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Inactivity can make your joints stiff, and the bones may begin to degenerate.

不活动会使关节僵硬，骨骼因此可能会开始退化。

《柯林斯英汉双解大词典》

Sharpe and Simpson, who ran Ideal Mobility Solutions, mainly sold ordinary mattress covers that were claimed to have health benefits for ailments such as bad backs and stiff joints.

BBC: Mobility aids con salesmen jailed

It will not come down until the two countries loosen their labour markets' famously stiff joints by cutting minimum wages, making hiring and firing easier, reducing payroll taxes and so on.

ECONOMIST: Jobs

Technology developed at MIT's Leg Lab, where Dilworth works, allows researchers to make robots with springy joints, not stiff ones.

FORBES: Dinosaur Robots For Sale