Updated

INDIANAPOLIS (Reuters) - Briton Mike Conway will be sidelined for at least three months recovering from leg and back injuries sustained in a terrifying crash during the final lap at the Indianapolis 500, a doctor said on Monday.

Conway underwent surgery on Sunday to repair fractures to his lower left leg and is expected to undergo another surgical procedure later this week.

The 26-year-old Briton also suffered a compression fracture of one of his thoracic vertebrae and will be fitted with a back brace for three months, Indy Racing League director of medical services Dr. Michael Olinger said in a statement.

The crash occurred after Conway hit Ryan Hunter-Reay, which launched his car into a fence and disintegrated.

Conway was removed from his mangled cockpit, examined at a trackside clinic and airlifted to an Indianapolis hospital.

The final lap was run under a yellow caution and fellow Briton Dario Franchitti coasted across the line to collect his second Indy 500 win.

(Writing by Steve Keating in Chicago, editing by Frank Pingue)