掷距骨，或称掷羊拐骨、掷髀石，是使用羊的后胫距骨作玩具，为历史悠久的儿童游戏，也有的用其他动物的距骨。

古埃及、古希腊人与古罗马人就有用距骨玩抛掷游戏。玩法通常是将跖骨抛上，用手接下，同抓布包游戏一样考验小孩的神经反应。跖骨因能掷出四面，可作为骰子游戏，也被认为是六面骰的前身。

在中国则流行于北方，是明朝时北京儿童的游戏，称为贝石，如刘侗、于奕正《帝京景物略》：「是月羊始市，儿取羊后胫之膝之轮骨，曰贝石，置一而一掷之。置者不动，掷之不过，置者乃掷；置者若动，掷之而过，胜负以生。其骨轮四面两端，凹曰真，凸曰诡，勾曰骚，轮曰背，立曰顶骨律。其顶岐亦曰真，平亦曰诡。盖真胜诡负而骚背闲，顶平再胜，顶岐三胜也。其胜负也以贝石。」

Knucklebones, Fivestones, or Jacks, is a game of ancient origin, usually played with five small objects, or ten in the case of jacks. Originally the "knucklebones" (actually the astragalus, a bone in the ankle, or hock) were those of a sheep, which were thrown up and caught in various manners. Modern knucklebones consist of six points, or knobs, proceeding from a common base, and are usually made of metal or plastic. The winner is the first player to successfully complete a prescribed series of throws, which, though similar, differ widely in detail. The simplest throw consists in tossing up one stone, the jack, and picking up one or more from the table while it is in the air. This continues until all five stones have been picked up. Another throw consists in tossing up first one stone, then two, then three and so on, and catching them on the back of the hand. Different throws have received distinctive names, such as "riding the elephant," "peas in the pod," and "horses in the stable."