Based on anatomical positions, in an elbow bump, the bones touching are Ulna to Ulna.
The elbow joint is made up of the upper arm bone, the humerus and one of the bones in the lower arm, the ulna.
An elbow bump is a form of greeting done wherein the elbows are bumped together.
The Ulna is the prominent bone that comes in contact when two persons do an elbow bump.
Therefore, in an elbow bump, the bones touching are Ulna to Ulna.
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