Kenalog and charley horses

I guess I am still trying to figure out if the Kenalog has been the reason for my unbearable leg cramps/Charley Horses. I am 62 years old and need knee replacement but tried the shot in each knee first. I must admit the shots have helped the pain tremendously...BUT...now when I do any type of standing on my feet for several hours I am awake all night with the worst leg cramps ever. I have never had leg cramps like this. I may have had an occasional cramp over the years but this is over and over all night long. I would be interested in knowing of anyone else has these same leg cramps.