Hi,Welcome to healthcare magic.
After going through your query I think You are suffering from
osteoarthritis of both knee joint as pain is behind knee cap and inside of knee.
You need further investigation by
x ray of both knee joints in standing position.
Analgesics (
DICLOFENAC 100 MG SLOW RELEASE TABLETS) whenever pain is helpful in pain relief.
Diacerinre and glucosmine sulfate protect
cartilage from breakdown and help in cartilage regeneration.
Quadriceps exercises is started after pain relief.
Sometimes vitamin D deficiency can aggravate this so serum vitamin D test is advised (if it is low than vitamin D supplementation will be required).
You can discuss with your treating doctor.
I think your query answered.Welcome to any follow up query.