Rp measurement	Humeral head major diameter	Standard Perform stem size

2D Major Head diameterr		Standard Perform stem size

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                                                                                                                                  Subtract 1 for long plus size

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AP humeral head major diameter
Standard Perform stem size
HHH
humeral head minor diameter
COR
Messieh tuberosity distance
HHH to pec
saggital humeral shaft width

​1 = Humeral Head Height
line 2-4 = major humeral head diameter
3 = COR
angle 1-2-3 = 15 degrees
line 1-3 = 0.1 * ​major humeral head diameter = 5 mm average

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Sagittal length relates to
1.  humeral head height to pec
2. major diameter humeral head

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