What body part did Jonas break in The Giver?

Jonas breaks his leg while riding downhill on a sled and learns about physical pain: "He gasped. It was as if a hatchet lay lodged in his leg, slicing through each nerve with a hot blade.

Explanation:

Uh yea, jonas broke his leg, i think if i remember right.

his leg

Explanation:

but it was in one of the visions