San Francisco 49ers head coach Kyle Shanahan announced after his team's 20-10 loss to the Arizona Cardinals Sunday that safety Jaquiski Tartt suffered a broken arm in the game and would likely be lost for the season. Tartt's broken arm is the latest in a long list of injuries to key 49ers players. Tartt is the second 49ers safety to suffer a season-ending broken arm in two weeks as Jimmie Ward sustained one last week against the Philadelphia Eagles.