You are not able to "sue" your employer in the traditional sense of the word. You would need to file a workers' compensation claim. Most attorneys will discuss this matter with you free of charge and you can decide if you need representation after discussing the matter with an experienced workers compensation attorney.
DISCLAIMER: This post is intended as general information applicable only to the state of Pennsylvania and is personal in nature, not professional in nature. The information given is based strictly upon the facts provided. This post is not intended to create an attorney client relationship, or to provide any specific guarantee of confidentiality.