At the hospital, the 74-year-old was diagnosed with a proximal humerus fracture -- the humerus being the upper bone of the arm.

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He was diagnosed with a proximal humerus fracture -- the humerus being the upper bone of the arm -- and as a result underwent what the Supreme Court said was reverse shoulder replacement surgery Saturday morning.

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The reason for the dose of caution is due to the skeleton being incomplete, with just one upper arm bone, and six vertebrae being recovered.

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However, the team behind the work has stopped short of definitively calling N parringtoni the earliest dinosaur, because the fossil skeletons used to define it were incomplete: one upper arm bone and six vertebrae.

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