人工髋关节的预计使用寿命达15年以上，往往会由于错位等原因而需要提前置换，而不是金属碎片所造成的损害。

Artificial hips, intended to last 15 years or more, need early replacement far more frequently for reasons like dislocation than because of problems caused by metallic debris.

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但外科医生说，如果祸端是金属碎片的话，置换手术会相当复杂，可能会对一些患者留下持久性并发症。

But surgeons say that when metal particles are the culprit, the procedures to replace the devices can be far more complex and can leave some patients with lasting complications.

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医生用一个金属球体置换了他的股骨头。

Doctors have replaced the top of his hip bone with a metal sphere.

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