This study provides information pertinent to screw width and length with respect to the ulnar shaft and calls in to question the use of 3.5 mm screws in the distal and midshaft ulnar diaphysis in females. Removal of 3.5 mm screws in the mid and distal ulnar shaft in females can leave a hole corresponding to 23% and 27% of the bone which can be concerning for a stress riser.