First of all if you live in CO I know someone that works miracles. When you get in a major accident like that it throws your entire body off, your posture and all you muscles. Your body is like a sweater vest, if you hook it on something it pulls and everything pulls with it. When you hurt your pelvis and back everything is going to shift for that injury. Certain muscles will be tight and contracted and others lengthened. So, your knee could be that your hamstrings or calves are pulling up on them because your pelvis could be elevated. You need to get you posture analysed, muscles tests done, a full report on your history, your daily activites, and get it corrected through deep deep neuromuscular massage. The muscles, fascia, tendons can cause entrapment ( compression) of you nerves or you bones, ligaments, and intervetebral discs can cause the impingement of your nerves and cause lots of pain. Easily fixed with someone that knows what they are doing. As you are getting these things fixed you should get exercises to do, Then possibly when feeling much better get a physical therapist that can work on endurance weights ( light more reps) and eventually work on a little more weight. I do this kind of work, but there are so many different factors and it takes a bit to pin point the problems, feel your muscles, look at your posture, ask questions. I am telling you though if you can find the right person it will probably work for you. I would also get a doctor release to do this kind of work as well and let him know you are trying it, just because you might need one. It is also good for them to exchange notes. I think you just have what many people have, and I believe this will work for you. I think you also need glutes ( the piriforms, the lateral 6 rotators), and illio psoas. These muscles play a big role with the hip and back problems. Many times the pirformis ( in you butt) get off centered and squish the siatica nerve causing pain all the way down the leg..... I could go on and on with this stuff all day but anyway, let me know what is going on I would love to help you with any questions or try and help you find someone good in your area. Good luck.