The Ascension® PyroCarbon Lunate is an anatomically designed lunate replacement with essentially the same shape as the native lunate bone. The Lunate implant acts as an articulating spacer to maintain the relationship of adjacent carpal bones after excision and to maintain mobility of the wrist. The articular concavity that captures the capitate is more exaggerated to enhance stability. The Lunate implant has two suture holes which allow fixation of the implant to the adjacent scaphoid and triquetrium bones to provide temporary postoperative stability while a capsuloligamentous system forms around the implant. The Ascension® Pyrocarbon Lunate is constructed of a high strength On-X® PyroCarbon layer deposited on a graphite substrate. The graphite is impregnated with tungsten making the Lunate implant radiopaque. The Ascension® PyroCarbon Lunate is intended for replacement of the lunate bone in the proximal carpal row of the wrist in the presence of Avascular necrosis (Kienboch’s disease), localized osteoarthritic, or changes in Long-Standing dislocations.
A sterile implantable device designed to replace the lunate bone in the proximal carpal row of the wrist typically in the presence of avascular necrosis, localized osteoarthritic changes, or longstanding dislocations. It is typically a one-piece device, made of one or several materials (e.g., carbon, graphite, metal), that may reflect the shape of the native bone. Short-term fixation is typically performed with sutures.
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