He exercises every day to strengthen his tibialis anterior muscle.

He is doing special exercises to strengthen his tibialis posterior muscle.

Learning about the ancient special kana usage is very important for understanding ancient Japanese.

The Jōdai Tokushu Kanazukai is one of the notation methods of ancient Japan.

The special theory of relativity is a theory proposed by Einstein.

He broke his thighbone in a skiing accident.

He broke his radius in a skateboard accident.

He fractured his ulna.

He is studying the shape of the anvil.

He fractured his anklebone.