Feasibility Study Evaluating the Safety and Effectiveness of Magnetic Bead Tracking System When Used With a Bionic External Prosthesis

Inclusion Criteria: * Male or Female age 22-65 at the time of surgery. * The patient must already have an existing unilateral or bilateral transtibial amputation requiring revision or a medical condition requiring performance of a unilateral or bilateral transtibial amputation. * If the patient does not already have an amputation, the patient must have undergone independent consultation with a lower extremity surgical specialist to ensure they have exhausted all limb salvage options prior to undergoing amputation, as well as a psychiatric evaluation to ensure appropriate capacity and volition, and a pain medicine evaluation to ensure that all pain control options outside of amputation have been addressed. * The patient must have the ability to ambulate at variable cadence (an expected lower extremity prosthesis functional level of K3 or above, as determined by a trained and certified prosthetist and confirmed by study investigators, through use of a patient history and physical examination). * The patient must have adequate soft tissue bulk and muscle mass present in the operative limb to support appropriate wound healing. * The patient must demonstrate volitional activation of the muscles into which magnet placement is intended. * In the opinion of the investigator, the patient must likely be able to tolerate the pressure of a prosthetic socket during ambulation post-operatively. * In the opinion of the investigator, the patient must have absence of any physical limitations…