Dear Sheila,
You might take a look at our website, www.kinamed.com. Recently we had clinical results published in the Journal of Bone and Joint Surgery for our custom patella femoral implant. A summary is available through the web site. For the right patient we have had very good success.
The prosthesis is designed for end stage, isolated patella femoral arthritis. If your disease affects the other portions of the knee joint it would not be appropriate.