The purpose of this clinical trial is to evaluate whether a bioelectrical nerve block via the Altius System is a safe and effective treatment for patients with post-amputation pain.

Patients could take part in the study if they had:

• One amputated lower limb
• Frequent and recurring pain which resulted from amputation

The trial will evaluate the Altius system, a device which provides a bioelectric nerve block. Eligible participants were implanted with an investigational medical device. The device includes a Cuff Electrode, which is gently coiled around the nerve, and Generator, which is similar to a pacemaker. Together they deliver an electrical signal to the nerve.

Caution: Investigational device. Limited by United States law to investigational use.