The running back suffered a broken left fibula and high ankle sprain in last Sunday’s NFC Divisional loss to the San Francisco 49ers. Dallas Cowboys running back Tony Pollard underwent successful surgery Tuesday for the left leg injury sustained in last weekend’s NFC playoff loss to the San Francisco 49ers. Pollard had a tightrope procedure to repair a high ankle sprain. He also suffered a broken fibula during the awkward tackle, but it should heal on its own without surgery or casting. He is expected to be ready for training camp. The NFL also announced that Minnesota Vikings running back…