The best place to start is discussing the various treatment options with your Doctor and developing an overall plan.  There are often other treatments to go along with bracing that will also be of benefit.  A weight bearing (e.g. standing) X-ray of the knee is the next step in the process, this helps to determine the extent of the arthritis and aids in the design process of the knee brace.....

There are many bracing options that will help to support your foot to prevent the toes from dragging and make it easier to achieve a more normal gait pattern. Your first step would be to discuss your concerns with your doctor and get a detailed prescription.

The best way to figure out what is happening here is to see your doctor and get a prescription to come see a Certified Pedorthist.  Your Certified Pedorthist will perform a thorough assessment to determine your needs and discuss what options with you...