Seasonality of precipitation along a meridian in the western U

An intramedullary compression and fixation device for compressing a long bone of a predetermined length which has been fractured medially to form first and second bone segments. The compression and fixation device includes an elongated intramedullary rod of sufficient length to project from one end of the bone past the fracture site and which is formed with a cross section of sufficient size to substantially occupy the cross section of the medial portion of the medullary canal of the bone. Peripheral thread means are formed on such rod and are of sufficient size to engage the cancellous bone forming the interior wall of the medullary canal to drive the rod axially in such canal upon rotation of the rod. Coupling threads are formed on one end of the rod for connection with an intramedullary rod driver-retractor device whereby an opening may be formed in one end of the bone and the end of the rod opposite the one end passed through the open end, the driver-retractor device engaged with the coupling threads and such device rotated to screw the rod through the one bone segment and into the second bone segment to thereby span the fracture and maintain the bone segments in fixed relationship with respect to one another.