Hi welcome to health care magic , I am sorry about the pain
is suggested only in cases of severe osteoarthritis
.Osteoarthritis is , in most cases, associated with severe pain
in the joints involved and it is likely that the diclofenac
has been masking or decreasing the pain that would be associated with the osteoarthritis.
Pain in our joints can also be referred, so pain in the knees may be felt along the legs or into the thighs. It is not likely to cause pain outside of the lower limbs.
If your doctor is comfortable with the use of the pain medication then you should consider restarting. If the pain continues despite the use of the medication or if the pain becomes severe or is not limited to the lower limbs then you should consider speaking and visiting your doctor for a check up.
I hope this information helps and I hope your surgery goes well