Generally, you do not have to worry about the effect of your pre-existing injuries on your current car accident claim unless you cannot prove that your new injury caused by the other motorist is different from your pre-existing injury.Luckily, however, Pennsylvania law allows car accident victims to seek compensation for aggravated injuries, especially if your pre-existing injury was significantly exacerbated due to the accident. It is advised to seek legal advice from a Philadelphia car accident lawyer to find out how your pre-existing injury affects your claim.