“膝盖骨”的英语？

外科医生在膝盖骨上套了个金属箍以帮助其愈合。Surgeons placed a metal band around the knee cap to help it knit back together.他踢足球时膝盖骨脱臼了.He displaced a bone in his knee while playing football.自己怎样检查自己膝盖骨是不是有裂骨?How do oneself check oneself patel...