Summarize the following:
Take away the hamster wheel to prevent further damage to the leg. If he lives in a rotastak system with multiple levels and pipes to climb through, remove all of the connections, shelving, or ladders to keep him in one unit. You should also avoid putting him in his exercise ball while his leg is healing. In general, avoid handling him in case he struggles and moves awkwardly on the broken leg.  By preventing the hamster from being too active, you will reduce the amount of weight he places on the leg. This lets the fractured ends start knitting together and repairing. If the hamster is active and uses his wheel, he will disrupt the early scar tissue and delay or prevent healing from taking place. a nutritious diet. Talk with the veterinarian about recommending a healthy diet that includes fresh fruits and vegetables. Consider offering them dried vegetables and other pellets so that they don't rot when your hamster tries to hoard them in a corner of his cage. You may also want to offer milk to drink, since the calcium can help heal bones. But, make sure the milk is fresh and replaced at least every two hours to avoid bacterial contamination. Don't feed your hamster too much, or it may grow overweight, which would put extra weight on its broken leg. Not all hamsters can digest milk, so if his pellets become soft or he develops diarrhea, stop offering milk immediately. Since hamsters are so small, it's impossible to bandage the fracture in any way that will help the healing process. It's more likely that a bandage would rub and cause skin sores, or distress your hamster. Your hamster would most likely chew off the bandage, possibly swallowing some of it. The pressure of a bandage on the fracture could also cause more pain. Keep in mind that while other animals, like cats or dogs, can have fractures supported in bandages, their bones are first aligned. The tiny size of a hamster makes this impossible to do. Typically, a fracture takes at least 4 weeks to heal, but some hamsters could take longer, up to 12 weeks. Once you've given him some time, watch for signs of healing, like walking on the leg, or no swelling over the fracture site. When you gently handle the leg, he won't react with pain and there shouldn't be any grating if the fracture has healed. If he reacts with pain, stop handling him immediately.  The clearest way to tell if healing is complete is to have your hamster x-rayed. But, this is expensive and you may need to anesthetize your hamster.  If your hamster has healed, you can reintroduce his wheel or multiple levels of his cage. There is a chance that your hamster's leg may heal incorrectly. If it does,  don't panic. Just monitor your hamster and it should be fine.
Let your hamster get lots of rest. Feed Avoid bandaging the fracture. Be patient and look for signs of healing.