 Moderately active amputees may have lost their limb due to diabetes, vascular conditions, trauma, tumour or congenital causes. These amputees currently cannot benefit from having a computerised knee because of the performance criteria associated with being given one. However, these amputees have a very high risk of falling because they use a non microprocessor controlled knee joint NMPK and because their physical ability, associated disability and persistent contralateral leg weakness do not allow them to compensate for a balance deficit. These amputees restrict how much they move around and their participation because of their instability and elevated risk of falling. 