Operative treatment for non-union of the carpal scaphoid bone with a small proximal fragment often presents some difficulties. A complete Silastic carpal scaphoid replacement does not always fit well because the shape and dimensions of the implant differ from the natural carpal scaphoid bone. The proximal fragment looks more like the lunate bone and so a Silastic carpal lunate implant may be used to replace the proximal fragment of the scaphoid while the well preserved distal fragment remains in place. This prevents disturbance of the intercarpal joint composition and improves stability of the base of the thumb. Five patients have been treated in this manner. The procedure is described in detail.