Andrews, a Birmingham, Ala.-based orthopedist for elite athletes, says preventing Brady's infection was nearly impossible, no matter how good the doctors are.
Andrew spoke as part of a medical panel on Wednesday that said doctors are seeing more children - especially girls - suffer knee injuries as they spend more time playing sports without time off.
Brady was injured in the Patriots' 2008 season opener and has not given a timetable for his return to the field.
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The San Diego team in the Alliance of American football announced the signing of former San Diego State offensive tackle Terry Poole, a fourth-round choice by the Seattle Seahawks in the 2015 NFL draft, and nine other players.
New ESPN president Jimmy Pitaro told reporters Friday that the network does not plan to televise the national anthem as part of its Monday Night Football broadcasts this season.