Clinical Trial of Tensegrity Prosthetics K3 Promoter Foot Prosthesis

Inclusion Criteria: 1. K2 or K3 classification based on current prosthetic device. 2. Males and females ≥ 18 years of age 3. Willing and able to sign informed consent 4. Able to read, write, and speak English 5. Documented to have a unilateral trans-tibial amputation 6. Actively utilizing a definitive prosthesis for at least 12 months 7. Utilizing current prosthetic foot for at least 3 months 8. Cognitively functional, in the opinion of the prosthetists' 9. Able to maintain a good gait on their existing limb for approximately 45 minutes 10. have a healthy residual limb in good condition 11. have a socket with a good, trouble-free fit on their residual limb Exclusion Criteria: 1. Significant ulcers or infections associated with a compromised circulation of the other lower limb 2. Intermittent Claudication or Critical Leg Ischemia in the non-amputated leg 3. K0, K1or K4 Classification 4. Irreducible, pronounced knee or hip flexion contractures 5. Bilateral amputations 6. Use of a walker for ambulation 7. Severe arthritis that would limit the ability to stand without pain or discomfort or the subject's ability to ambulate is limited by symptoms other than the prothesis (e.g., shortness of breath, fatigue, angina, arthritis, etc.). If, in the opinion of the investigator, the subject were to improve their ability to ambulate from the K3 Promoter to the extent that his or her walking would then be limited by a symptom other than the prothesis, the subject should not be enrolled 8. Any other clinically significant medical or psychiatric condition that in the opinion of the Investigator could impact the subject's ability to successfully complete this trial 9. Advanced neurologic disorder 10. Severe congestive heart failure, angina pectoris, or obstructive pulmonary disease 11. Use of medication that causes impaired balance or judgment