US Patent 8400312 Operation assisting system

An operation assisting system. When an operator manipulates an operation instrument to perform an operation for a joint surgery including a hip replacement, the operation assisting system provides the operator with information on the orientation of a bone such as a pelvis and an appropriate direction of the operation instrument relative to the bone to assist the operator so as to complete the operation in an easy and accurate manner, which ensures a high degree of operation accuracy and reduces the cost of the system.