Step 1: Understanding the terms
- A Sprain is an injury involving the stretching or tearing of ligaments, which are the tissues that connect bones at a joint.
- A Strain involves damage to muscles or tendons (not ligaments).
- A Contusion is another term for a bruise, usually resulting from a blunt force impact.
- An Avulsion refers to a condition where a fragment of bone is pulled away by a tendon or ligament.
Step 2: Evaluating the scenario
The question specifically mentions "stretching or tearing of his ligaments", which is the textbook definition of a sprain. This typically occurs in joints like the ankle, knee, or wrist during activities involving sudden twists or impacts.
Step 3: Final Answer
Since ligaments are affected in this case, the correct diagnosis of the injury is a sprain.