AS: Ankle Spacer for Talar Osteochondral Defects

Inclusion Criteria: * age ranging from 18 to 80 years * talar osteochondral defect (multiple degenerative talar cysts present, and/or prior failed surgical treatment and/or multiple defects and/or large (\>15mm)) * willing to receive surgical implantation of the Ankle Spacer * has been informed of the nature of the study and provided written consent * The subject and treating physician agree that the subject will return for all required post-procedure follow-up visits * failed previous conservative treatment * complaints for at least 6 months Exclusion Criteria: * -severe ankle malalignement.(\> 5° varus/valgus). * fracture \< 6 months - tendinitis - diabetes mellitus / rheumathoid arthritis * advanced osteoporosis * grade two or higher (Kellgren-Lawrence-Score) ankle joint degeneration on the tibia side. * any ankle deformation that does not allow proper rasping of the cartilage and/or proper seating of the desired sized implant, as described in the surgical technique. * blood supply limitations and previous infections, which may retard healing. * foreign-body sensitivity. Where material sensitivity is suspected, appropriate tests should be made and sensitivity ruled out prior to implantation. * active infection or blood supply limitations. * conditions that tend to limit the patient's ability or willingness to restrict activities or follow directions during the healing period, including severe neuro-arthropathy. * pathological conditions, such as insufficient quantity or…