The following spatio-temporal parameters were recorded and used for the analysis: walking velocity, cadence, stride length and stride time. The stride length was normalized to the subject's height. The absolute value of the symmetry index (SI) of step length, step time, single support time and double support time was also used for the analysis and were calculated [14]. Three trials were taken from each subject for the analysis with a total training data of 69 (12 healthy and 11 symptomatic). The symptomatic subjects (OA) were labeled as +1 and −1 indicated healthy subjects.