Injuries that don’t leave outwardly visible marks, are injuries insurance companies frequently deny. Things like knee, shoulder, back, and neck pain are injuries that insurance company claims adjusters and lawyers will try to blame on pre-existing conditions, degeneration or the aging process. They will work to convince you and a jury that there is no evidence of a new injury. Your past medical records and medical expert testimony can make or break these arguments, which are frequently invented or exaggerated by the insurance company to hold down their costs.