"Mrs. Ford is resting comfortably at her home. She is recovering well," the statement said.
The statement did not say when Mrs. Ford, who turned 89 on Sunday, was released from Eisenhower Medical Center.
The Ford office has not disclosed the nature of the surgery. A call to the Ford office was not immediately returned.
"Mrs. Ford and the Ford family extend thanks to everyone for their prayers, well wishes, cards and flowers," the statement said.
She was born Elizabeth Bloomer in Chicago on April 8, 1918, and raised in Grand Rapids, Mich.
Former President Gerald Ford died Dec. 26 at age 93.
First lady from 1974 to 1977, she came to earn wide respect through her frankness as she battled breast cancer, arthritis and addictions to drugs and alcohol.