An intramedullary fixation device comprising: an intramedullary implant having a longitudinal bore along a longitudinal axis, the intramedullary implant including an elongated slot, a lateral-medial through-hole transversely crossing the longitudinal axis in a lateral-medial direction, and a posterior-anterior through-hole transversely crossing the longitudinal axis in a posterior-anterior direction, wherein the intramedullary fixation device further comprises: a two-component compression device preassembled in the longitudinal bore of the intramedullary implant, the compression device movable along the longitudinal axis, the compression device defining an end opening corresponding with the elongated slot of the intramedullary implant; and a two-component locking device preassembled in the longitudinal bore of the intramedullary implant, the locking device defining an end opening corresponding to the lateral-medial through-hole of the intramedullary implant for receiving a first calcaneal fixation fastener, the locking device defining a through-hole corresponding to the posterior-anterior through-hole of the intramedullary implant for receiving a second calcaneal fixation fastener, the locking device operable to lock the first and second calcaneal fixation fasteners (400b, 400c) in the intramedullary implant. an intramedullary implant having a longitudinal bore along a longitudinal axis, the intramedullary implant including an elongated slot, a lateral-medial through-hole transversely crossing the longitudinal axis in a lateral-medial direction, and a posterior-anterior through-hole transversely crossing the longitudinal axis in a posterior-anterior direction, wherein the intramedullary fixation device further comprises: a two-component compression device preassembled in the longitudinal bore of the intramedullary implant, the compression device movable along the longitudinal axis, the compression device defining an end opening corresponding with the elongated slot of the intramedullary implant; and a two-component locking device preassembled in the longitudinal bore of the intramedullary implant, the locking device defining an end opening corresponding to the lateral-medial through-hole of the intramedullary implant for receiving a first calcaneal fixation fastener, the locking device defining a through-hole corresponding to the posterior-anterior through-hole of the intramedullary implant for receiving a second calcaneal fixation fastener, the locking device operable to lock the first and second calcaneal fixation fasteners (400b, 400c) in the intramedullary implant. a two-component compression device preassembled in the longitudinal bore of the intramedullary implant, the compression device movable along the longitudinal axis, the compression device defining an end opening corresponding with the elongated slot of the intramedullary implant; and a two-component locking device preassembled in the longitudinal bore of the intramedullary implant, the locking device defining an end opening corresponding to the lateral-medial through-hole of the intramedullary implant for receiving a first calcaneal fixation fastener, the locking device defining a through-hole corresponding to the posterior-anterior through-hole of the intramedullary implant for receiving a second calcaneal fixation fastener, the locking device operable to lock the first and second calcaneal fixation fasteners (400b, 400c) in the intramedullary implant.