If a fracture of the carpal navicular bone is intended to be fixed externally with a cast, it is usually necessary to choose the most stable external fixation method, and using a tubular cast is the best. Because of the poor circulation of the carpal navicular fracture compared to other fractures, the carpal navicular fracture grows relatively slowly and requires strong external fixation to promote its growth. In addition, the position of fixation must generally be fixed at the wrist, between 25-35 degrees of dorsiflexion, the angle of fixation of the wrist joint is usually the least stressful for the carpal navicular. The position of the thumb is in the opposite palm position, which also relaxes the carpal navicular bone, and the bone is usually fixed for about 3 months to achieve clinical healing.