Unilateral transfemoral amputees between 18-75 with K level three or higher
More than one year after amputation
Using current prosthetic socket and leg for more than three months
No major skin issues on the residual limb for more than six months
Can walk for more than 4 minutes continuously without any other assistive devices
You may not be if
Have very short residual thighs (the length of the residual limb is \<15% of the length of the unimpaired limb)
Are \<1.50m in height or \>116Kg in weight (who would not fit our prosthesis or the PowerKnee)
Have cognitive, visual, audio impairments that would affect their ability to give informed consent or to follow simple Instructions during the experiments
Have any significant co-morbidity that interferes with the study (e.g. stroke, pacemaker placement, pain, etc.).
