He underwent surgery due to an injury to his extensor digitorum communis.

He is doing a special exercise to strengthen his extensor indicis.

He stretches his extensors every day.

I take classes every day.

He got injured during a soccer match.

While playing soccer, he got hurt in his leg.

He accepted my proposal and started the project.

He underwent heart surgery.

He needs to have heart surgery.

He underwent surgery due to an injury to his extensor pollicis brevis.