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11-22 mm (distance between sun and closest orbit )
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The IM rod depth is set to 15 mm based on preop CT scan
The following are studies, thoughts and ideas. Nothing is validated or peer reviewed. A think tank for discussion and entertainment. Predicted dimensions or sizes or images and drawings are not intended to use or treat.
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Rp= a(1-e) Ra= a(1+e) e= 0.5 e= c/a Major humeral diameter = Ra/cos 45 
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Example:
Rp= 13 a= 26 Ra= 39 Rp + Ra = 52 c^2 = sqrt (26^2 -23^2) c=13 Rp = 26-13 = 13 Major humeral diameter = 52 Minor diameter = 45 eccentricity = 0.5 Major humeral head diameter is roughly 4 * Rp
Observation: The morphology of the shoulder follows planetary elliptical paths and Keplers laws can roughly predict shoulder joint dimensions and basic ellipses
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