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Description
Pronated hands VS Supinated hands.

Hand pronation is a huge issue in most dinosaur-based art, and seems to be either a holdover from when dinosaurs were thought to run around in a tripod-like stance, or because Jurassic Park's dinosaurs had pronated hands.

Hand pronation ,at this point, is something not many dinosaurs can really do, and is even rarer in living animals today, not even crocodiles have pronated hands or birds.

Pronated or, zombie/ bunny hands, are completely useless to the animal, as now they are stuck in the useless and broken position. These hands can not be used to grab or manipulate objects. Dinosaurs' wrists weren't super flexible like ours, so once a dinosaurs' wrists are broken/pronated,they won't be doing much besides folding them inwards.

Ironically,whenever a dinosaur that usually has pronated hands wants to try and grab,manipulate,hold,threaten,or attack something, they usually supinate the hands ..

Pronated hands allow the dinosaur to:
Hold grocery bags and purses, look like a zombie, dig?

Supinated hands in dinosaurs is something the paleo community knows about pretty darn well, and isn't something that can be easily argued against,due to evidence proving that dinosaurs couldn't pronate their hands ,as well as dinosaur trackways. One could say supinated hands mean dinosaurs couldn't dig(as its one of the few realistic 'benefits' to having pronated hands),except a dinosaurs' back legs and feet were better suited for the task.

Supinated hands allow a (theropod) dinosaur to:
Cling to trees, hold and manipulate objects without easily dropping them, allow theropods with wings to display them, threaten other animals, slash and grab towards itself, use wings for potential increased turning radius in winged theropods, allow winged theropods to cover eggs when brooding, gliding and flight in smaller winged theropods, grasping partner during mating,and a few more things

A dinosaur with pronated hands could do none of those,especially the ones with the wings, as wings wouldn't work on a dinosaur with pronated hands,as a huge amount of the wing would be pointed straight out,and straight foreward, since the feathers there attach to the second digit of the hand, as with birds.

By wings I do not mean wings meant for flight, but a series of long fairly advanced feathers on the arm.

In this day and age, in the year 2012, there is no real reason for hand pronation whatsoever other than just plain not knowing and definitely not doing research.

Description
Pronated hands VS Supinated hands.

Hand pronation is a huge issue in most dinosaur-based art, and seems to be either a holdover from when dinosaurs were thought to run around in a tripod-like stance, or because Jurassic Park's dinosaurs had pronated hands.

Hand pronation ,at this point, is something not many dinosaurs can really do, and is even rarer in living animals today, not even crocodiles have pronated hands or birds.

Pronated or, zombie/ bunny hands, are completely useless to the animal, as now they are stuck in the useless and broken position. These hands can not be used to grab or manipulate objects. Dinosaurs' wrists weren't super flexible like ours, so once a dinosaurs' wrists are broken/pronated,they won't be doing much besides folding them inwards.

Ironically,whenever a dinosaur that usually has pronated hands wants to try and grab,manipulate,hold,threaten,or attack something, they usually supinate the hands ..

Pronated hands allow the dinosaur to:
Hold grocery bags and purses, look like a zombie, dig?

Supinated hands in dinosaurs is something the paleo community knows about pretty darn well, and isn't something that can be easily argued against,due to evidence proving that dinosaurs couldn't pronate their hands ,as well as dinosaur trackways. One could say supinated hands mean dinosaurs couldn't dig(as its one of the few realistic 'benefits' to having pronated hands),except a dinosaurs' back legs and feet were better suited for the task.

Supinated hands allow a (theropod) dinosaur to:
Cling to trees, hold and manipulate objects without easily dropping them, allow theropods with wings to display them, threaten other animals, slash and grab towards itself, use wings for potential increased turning radius in winged theropods, allow winged theropods to cover eggs when brooding, gliding and flight in smaller winged theropods, grasping partner during mating,and a few more things

A dinosaur with pronated hands could do none of those,especially the ones with the wings, as wings wouldn't work on a dinosaur with pronated hands,as a huge amount of the wing would be pointed straight out,and straight foreward, since the feathers there attach to the second digit of the hand, as with birds.

By wings I do not mean wings meant for flight, but a series of long fairly advanced feathers on the arm.

In this day and age, in the year 2012, there is no real reason for hand pronation whatsoever other than just plain not knowing and definitely not doing research.