This trial aims to investigate the use of the patient's own bone marrow stem cells in the treatment of chronic non-healing leg ulcers. The trial is being conducted at the Universidad de la República and the Hospital de Clínicas Dr. Manuel Quintela in Montevideo. The trial expects to enrol six participants by December 2013. Participants will have stem cells from their bone marrow harvested and injected into around the ulcers. All participants will be monitored for complications following the procedure, and changes in clinical condition, including a reduction in the size of the ulcer.