Definition of principal for English Language Learners. : 1  the person in charge of a public school. : 2  the person in charge of a university or college. : 3  an amount of money that is put in a bank or lent to someone and that can earn interest.
A quadriceps contusion is one of the more common injuries seen in athletes competing in contact sports and results from a direct blow to the front of the thigh.This type of injury often goes undertreated and may result in serious complications for the athlete.ecause of the location of the quadriceps, they can be subject to direct blows during sports competition. A deep quadriceps contusion can be one of the most disabling injuries for an athlete because injury to these muscles can severely impact an athleteâs ability to effectively use his/her leg.
Quadriceps: Although the term quadriceps technically may refer to any four-headed muscle, it usually refers to and is synonymous with the quadriceps muscle of the thigh, the large muscle that comes down the femur (the bone of the upper leg), goes over the patella (the kneecap) and anchors into the top of the tibia (the big bone in the lower leg).