Correct rasp size
Insert rasps of increasing size until the end of the rasp protrudes above the bone an amount equal to the previously measured posteromedial metaphyseal extension (h). If the rasp fits snugly in this position, the optimal size has been found. If not, increase the rasp size and progress until you reach the appropriate height. Be careful not to exert too high of a force as the shaft is at risk of fracturing.
Size of the humeral shaft component
The correct size of the humeral shaft component equals the last rasp size used.