Police said it happened in the West Elsdon neighborhood's 4500 block of West 59th Street just before 9:30 p.m.
Officers responded to a domestic disturbance between two people. One officer started to get out of their vehicle when they were struck, police said.
Other officers on the scene removed the offender from that vehicle and placed him in custody.
The injured officer suffered swelling to the arm and leg and was transported to Little Company of Mary in good condition. No further injuries were reported, and charges are pending.
INTERACTIVE SAFETY TRACKER Track crime and safety in your neighborhood