Hmmmm... Is the nano hive helping the whole body or just the arm? If its helping the whole body, *I* wouldn't let you plant the have in the arm in the first place simply cause (from my understanding) the nanites travel through the blood stream, and a cyberarm has no blood. Sure, you are connected to it, but I imagine that is through a sealed and sanitary port-like connection (hydrolic fluid is rather poisonous after all, and so is many lubricants!).
But, that could just be my intrepretation of cyber limbs and Hives...
If it just affected the arm, then it would still have to match the grade of the arm..,