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Planning

An important general rule is that the minimal distance of a screw head from the fragment apex must be at least the diameter ...

Number of screws

Ideally, 3 screws will be used to fix the larger fragment, although, more commonly, insertion of only 2 screws will be possible.
When planning for the screws, assess the fracture plane and the size of the fragments. Keep in mind that the larger fragment must be at least as long as twice the diameter of the diaphysis if screw fixation alone is to be used.
An important general rule is that the minimal distance of a screw head from the fragment apex must be at least the diameter of its head.