Knee pain and muscle cramps!

I am just wondering if anyone else who has bad knee pain also has chronic nocturnal leg cramps in their calf muscle? I've been getting these cramps almost nightly and the more my knee aches before I go to sleep, the more painful the cramp will be when it comes at night.

I have an osteochondral defect in my knee with 3 loose bodies floating around - two of which regularly get stuck around my knee cap an dleave me in excruiating pain. However, whenever I get these leg cramps I usually wake up not only with these bodies back under my knee cap, but also find that I can bend me knee much better the next morning.

Anyone ever come across this? Is it coincidence or is something about my particular injury causing these leg cramps?