translation.en: He was crippled, and indeed the natural progression as this gets worse is for them to become progressively twisted, progressively disabled, and many of these children do not survive.
translation.zh: 他的腿跛了，事实上随着病情恶化， 肢体扭曲的情形会加重， 残障日益加重，许多孩子无法存活。