Harry was playing in the courtyard, while kicking a football, Stretching or tearing of his ligaments took place. Identify the name of Harry's injury:

The correct option is Sprain.

To understand why this is the correct answer, let us break down the injury and define the key anatomical terms involved:
1. Ligaments: These are tough, fibrous bands of connective tissue that connect bones to other bones at a joint. They provide stability and prevent excessive movement of the joints.
2. Sprain: A sprain is defined specifically as the stretching or tearing of ligaments. This typically occurs when a joint is forced beyond its normal range of motion, such as twisting an ankle or knee while playing sports like football.
3. Strain: In contrast, a strain is the stretching or tearing of muscle fibers or tendons (which connect muscle to bone), not ligaments.
4. Contusion: This is a medical term for a bruise, which is caused by a direct blow or impact that crushes underlying muscle fibers and blood vessels without breaking the skin.
5. Avulsion: This refers to an injury where a body structure (like a tendon or ligament) is forcibly detached or torn away from its point of insertion on the bone.

Since Harry's injury involves the stretching or tearing of his ligaments, it is classified medically as a Sprain.