Will Taking Gabapentin Help Relieve Pain On Both Knees?

i am on gabapentin for leg pain and also need both knees replaced....my shin has been hurting me as well as the back of my knee for about a month. I have had it xrayed and they say I also have bad arthritis behind my kneecap and that is probably where the pain comes from ...I can hardly walk anymore and live on vicodin, motrin 800 as well as pain patches in order to walk in a store for a bit...I am in the least pain when I sit...but I don't want to get a blood clot by sitting too long...I only get up every few hours to walk in the house and then I need to sit down again...My leg is constantly hurting and I have been checked for blood clots......If I get knee surgery, I am wondering if this pain will go away. Could my knee be causing my shin as well as the back of my leg to hurt so badly even while on 300 mg. of gabapentin twice a day??? Thank You!