Steelers still banged up in the backfield

The Steelers could need running back Jonathan Dwyer to carry the load again on Sunday, against the Redskins. Running backs Rashard Mendenhall and Isaac Redman missed practice Wednesday.  Mendenhall has an Achilles tendon injury; Redman is nursing an ankle problem. Dwyer, who didn’t practice Wednesday for reasons unrelated to injury, rushed for 122 yards in…