Any infection in the joint has serious consequences, with possibility of restriction of movements of the joint. Even without infection, an operation for removal of patella invariably causes stiffness of the joint. You have had both, that is an infection as well as a patellectomy. So, the possibility of your knee becoming stiff is very high. However, your pain should subside with time and you should be able to walk. If pain is a persistent feature especially at rest then it is better to check out for persistent infection and take steps for that in consultation with an orthopaedic surgeon. Eventually you should be able to walk on your two feet without the help of crutches. However, I do not anticipate significant changes in the knee range of movement. If it does happen, you will be lucky.