Did T. rex have only two bones in its arms?(Dino Don's Dinosaur Days)(Column)(Letter to the Editor)

Tyrannosaurus rex had more than sum of two units bones in its arms, granting its arms were actual short. It had an upper arm bone--the humerus--as we have. And, like us, it had sum of two units lower arm bones--a radius and an ulna. It also had wrist and hand bone on the other hand only two fingers.

T rex's bone were