A medical instrument with modular intramedullary nail is presented, which includes at least one intramedullary nail and integrating device. The intramedullary nail is a bar with at least one integrating portion, which is set between the two ends of the intramedullary nail. The axial surface of the intramedullary nail forms at least one connecting face. The integrating device is coupled to the integrating portion of the intramedullary nail, to combine the intramedullary nails together with the connecting faces thereof.
