Ask your doctor for a Voltaren prescription. It is diclofenac based gel that works magic on sore knees and other inflamed joints (not shoulders or hips due to more tissue). I get mine in Mexico for under $15 and no prescription required. US there is a co-pay of $20 to $40 depending on your coverage :-(. I use it for L4 spine dam age and arthritic hands. I asked the surgeon who replaced my knee if I could apply Voltaren when the knee started aching and he simply replied, ‘that’s our go to for inflamation’. Told him I didn’t need a prescription when he offered to write one!2 weeks today, off cutches still limping, think I might escape the knife?