Hip dislocation and the sequel of recurrent instability continues to be a problem following Total Hip Arthroplasty, and is one of the leading causes of revision surgery.

髋关节脱位以及不稳定是髋关节置换的主要问题，是髋关节置换术后翻修的首要原因。

youdao

Instability: Dislocation is one of the most common complications of total hip arthroplasty.

不稳：脱位是全髋置换最常见的并发症之一。

youdao

To evaluate fracture instability, the total sum of stresses due to residual welding or rolling stresses, dead load, and live loads must be considered.

计算断裂失稳性时，必须考虑焊接或轧制残余应力，恒载应力和活载应力之总和。

youdao

To do so, he said, would risk setting the country on a "road to total chaos and instability" and that the intervention of the army might then be common sense, to stabilise the situation until the political process could be resumed.

BBC: Egypt elections: ElBaradei warns of chaos