The most common cause of a groin strain occurs when a muscle is stretched too far (when lunging forward or sideways reaching for a ball), or meets an unexpected opposing force.

This injury occurs when the knee experiences an external or internal force that puts the anterior cruciate ligament under strain, causing it to either sprain or rupture.

Arthroscopy may be best known for repairing knees injuries, but it's also a valuable method for treating ankles.