One hundred and seventy-two randomly selected high-school football
players underwent pre-season isokinetic muscle-testing to determine if
there was any relationship between an imbalance in thigh-muscle function
and the occurrence of knee injuries. Strength, power, power-endurance, and
time to maximum tension were measured for the quadriceps and hamstring
muscle groups for both lower extremities of each athlete. The resulting
values were utilized to see if a difference of 10 per cent or more between
the right and left extremities or between the mean and actual
hamstring-to-quadriceps ratio of the individual extremity would result in
more knee injuries. No such relationship was found.