Latimer, I'm going to give it to you very straight. I've spent millions of dollars in legal fees on litigation. At best you are looking at getting your medical bills paid... if you should win. I say this as a big IF. The burden of proof is on YOU for any damages portion of a trial. Tearing your ACL is NOT a six figure pain and suffering judgement unless you are lucky enough to get a jury of retards. (Which is possible.)
Your biggest obstacles are:
1. Legal fees. You might be able to get a lawyer to take this case on contingency, but that is highly unlikely because this is not a big settlement case. If you do get it taken on contingency you are looking at 50% of any settlement going to your attorney. (Lowe's would not settle till day of court - which would put you in the 50% bracket.) Secondly it costs approximately $200,000 just to get a case to day of court and another $250,000 to try a case. The only thing that has a remote chance of throwing fear into Lowe's is the idea of having to pay YOUR LEGAL FEES should they lose. They aren't going to care squid about any judgement because you aren't really looking at one.
2. Your case is not a clear win... and this is what will keep a lawyer from taking it on contingency (that and the fact it is a low money case with difficult to prove damages.)
Your best bet is to hire an attorney to write a letter for you offering to settle the case immediately if Lowe's will agree to pay your medical bills. That is probably the best deal you will get.
but, all this said - talk to an attorney first. He may tell you I'm full of sh-t and that you have a great case.
The bottom line rule is TALK TO AN ATTORNEY.