I. Introduction
Anterior Cruciate Ligament (ACL) is important for taking care of the stability of the human body. However, the ACL injury is an injury which can usually happen with anybody in daily activities and especially in sport activities. The ACL injury, the tear of the ACL ligament, can be found in many athletes and normal people as a result from the fact that they perform tasks which leads to the tear of ACL. The gait data can be described by many variables. This leads to the large dimension of the data. This will be difficult to manually discriminate the gait patterns of the ACL patient from the gait patterns of the healthy person. It will take a huge amount of time and human labors.