If this causes them to automatically flex their knees or hips, then it's called the Brudzinski's sign.
如果这导致他们自动弯曲他们的膝盖或臀部，那就是所谓的布鲁金斯基征象。
英语百科
Brudziński's sign
（重定向自Brudzinski sign）
Brudziński's sign or a Brudziński sign is any of three medical signs, all of which may occur in meningism. All three are named after Józef Brudziński. In English, the name is often written without the diacritic (like many borrowed words) (Brudzinski) and is pronounced /bruːˈdʒɪnski/.