Chicago Bears tight end Zach Miller posted a video of himself walking without crutches on social media Sunday, less than a week after he told reporters he had started bending his surgically repaired left knee. Miller dislocated his left knee and tore the popliteal artery in that leg during an Oct. 29 game against the New Orleans Saints, an injury that has resulted in amputation for other football players. During his first trip to the Bears' practice facility since the injury, he told reporters that he has had eight surgeries on the knee and wasn't sure whether more would be required. Miller arrived at the facility on crutches, with a bulky brace on his left knee. He told reporters he had only recently started to bend his knee again.