The Medical Faculty Associates’ director of executive medicine announced President-elect Joe Biden suffered hairline fractures in his mid-foot after twisting his ankle this weekend.

Kevin O’Connor, who also is an associate professor of medicine, said Biden’s follow-up CT scan confirmed the fractures, which quickly became a national headline. O’Connor said the injury, which occurred when Biden slipped while playing with his dog on Saturday, will “likely require” Biden to wear a walking boot for “several weeks,” CNN reported.

O’Connor has served as Biden’s primary care physician since 2009, which includes Biden’s time as vice president, according to his MFA profile.

“Initial x-rays did not show any obvious fracture, but his clinical exam warranted more detailed imaging,” O’Connor said in a statement provided by the Biden transition team. “Follow-up CT scan confirmed hairline (small) fractures of President-elect Biden’s lateral and intermediate cuneiform bones, which are in the mid-foot.”

The Biden campaign released a summary of Biden’s medical history written by O’Connor late last year.