It happened Thursday afternoon on the 1700 block of York Avenue just after 1 p.m.
The woman was knocked to the ground and suffered a broken left shoulder after the suspect grabbed her purse from her hands.
The thief got away with $115. He then fled on foot, heading westbound on East 89th Street.
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Police believe the suspect is between 20 and 30 years old.
The victim was taken to Cornell Hospital in stable condition.
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