Help Mace Beat Luxating Patella

Hi, my name is Brianna. I have a cat named Mace. Mace was recently diagnosed with Luxating Patella (an orthopedic condition that causes lameness in his legs). This condition causes his knee cap to slip in and out of the groove in the femur where it should reside. He can barely walk and when he gets a few steps in, he collapses. I cannot afford to give him the care that he needs (x-rays, mri, surgery). Anything will help. Thank you!