BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective of a first embodiment of a proximal humeral fracture fixation system according to the invention, shown with a humeral plate, posts, transverse cross pegs, and set screws; FIG. 2 is another perspective view of the first embodiment of FIG. 1, showing the humeral plate provided with one fixation post; FIG. 3 is a perspective view showing the r