hello mam/ sir, the problem you are facing is a normal side effect of long term use of steroid injections. Kenalog usually decreases calcium absorption from intestine and increases calcium excretion from kidney and also promote calcium loss indirectly due to decreased formation and increased resorption creating a negative calcium balance which is usually not visible in serum examinations which you have already gone through. i suggest you to once have vitamin D test too. if it comes out to be borderline please start taking vitamin d supplements to enhance what ever calcium can be absorbed orally and also start taking calcium and magnesium for at least a month to have better results. Cramps normally result if you are lacking calcium or magnesium or vitamin d even if the test result suggest everything is normal. you can go for bone scan too to come to know how is calcium in your bones. hope you find this information effective. thank you