Hello all,

I just had a question on what the formula to calculate Zp was for an ellipse.

I have been pushed in the direction that:

Zp = π/32 ⋅a^3⋅b

Where:

a= half of the major axis length

b= half of the minor axis length

On the other hand, I have been directed that

Zp= Polar moment of Inertia/Farthest point from the centroid

I am trying to calculate the Zp of a cross sectional image of bone, and as that is not a solid or hollow shaft, I am struggling at what formula to use to calculate the Zp.

Any help is greatly appreciated,

Archie

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