Thanks for the query to H.C.M. Forum.
Since , you have not mentioned the type of cancer in kidney
If cancer was malignant than it may have spread to other parts ( secondaries ).
Since you are complaining joint pain , so consult an Oncologist/orthopaedician and get his opinion.
2nd reason of joint pain may any disease in the head of femur
( hip bone
) as this is very common in this age group patient.
3rd reason may be deficiency of calcium.
So get in blood examination for calcium level and also bone density