Our expert says:
"arthritis" can also mean inflammation in a joint and is not always rheumatoid or osteo arthritis. You may have chondromalasia - see http://orthopedics.about.com/cs/patelladisorders/a/chondromalacia.htm
You probably need to see a doctor to examine the knee and see if x/rays are needed, and then anti-inflammatory medication and physiotherapy will probably help. If you have to kneel, please use a pillow or something soft to kneel on.
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