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The Avanta uHead™ prosthesis is anatomically designed to replicate the distal ulnar head and its contact within the sigmoid fossa of the distal radius. The prosthesis is available in multiple sizes that accommodate the anthropomorphic variations of the distal radio-ulnar joint (DRUJ). During prono-supinatory activities, the head component provides a smooth articulation with cartilage at the sigmoid notch and undersurface of the triangular fibro- cartilage (TFC). In addition, the head component has holes that accommodate anchoring of soft tissues, specifically the TFC, extensor carpi ulnaris (ECU) subsheath, and the ulnocarpal ligament complex, to provide stability while soft tissue maturation occurs. The stem component is tapered for rigid intramedullary fixtation and can be used with or without bone cement. The head and stem components are coupled together using a Morse taper and are modular to accommodate variations in anatomy. The stems are also offered in an extended collar configuration for revision of failed Darrach and Suave-Kapandji procedures.

MKT 11080 Rev. A

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