An infection is defined as the invasion of an organism's body tissues by disease-causing agents, their multiplication, and the reaction of host tissues to the infectious agents and the toxins they produce. In simple terms, an infection occurs when a foreign organism enters a person's body and causes harm.
ACL (Anterior Cruciate Ligament) sprain or tear is one of the most common knee injuries (sports-related or otherwise). Three bones meet to form a knee joint: thighbone (femur), shinbone (tibia) and kneecap (patela). To provide protection, the kneecap sits in front of the joint.