sports injuries

1. treatments

1.1. average recovery time

1.2. the untreatables

2. injury scandals

2.1. injuries on purpose

2.2. who

2.3. when

3. common

3.1. concusions

3.1.1. rules

4. uncommon

4.1. serious

4.2. deaths

4.2.1. who died

4.2.1.1. worst sports injuries

4.3. what injury

4.3.1. ttreatment

5. famous

5.1. who

5.2. what happened

5.3. did they return

5.3.1. life after