This is a good question. There is anyhow couple of different possibilities to keep up your running training
Hopefully you have an access to a fitness center, if not, then it is time to get one 
Well you cannot use the treadmill this time, as you cannot run, but you can definately use the eclipse and crosstrainer, how ever you want to name it.
The problem in running most of the times is, that your joints and spine are in a very hard press every time you land on your foot, and this pressure makes your injury worse. To release this hard press, but anyhow keep the cardiovascular system working, the eclipse is a great alternative. As you just move your legs back and forwards without landing like in running, you keep your heartrate level as high as in running and the effort is more or less the same.
Remember on eclipse:
– keep your running position, dont let the hips fall back
– arms like in running, dont hold on the poles
– keep the frequence/cadence high, and resistance low
On eclipse you can make intervals, long run, and even restitution run, that normally you cannot do when running As in running there is nothing called restitution run, remember that, running is always to hard to “rest with”.
Another great running training alternative is aquajogging. What you need is:
– swimming pool , lake, sea, where you dont bottom
– aquajogging belt
– alternative aquajogging shoes
This training has the same goal as with eclipse: you keep working with your running muscles, without giving too hard pressure on your body, and anyhow you train your cardiovascular system as well, and you keep your running muscles working. Aquajogging holds on your running movements as a muscle movement always starts with a signal from your brain. Normally the heartrate dont get as high in the water as on the land, you might see a difference of 10-15 beats in the water and land. You can aquajog as long as you run on the land. In the beginning it might feel a bit heavy, but when you get going, you will find the rhytm.
Actually aquajogging is a great injury avoiding and restitution training as well. Add it to your weekly training programme already before you are injured, and you are more safe and will be able to make your running training on the land! This is because in the water your joints and ligaments are not under a pressure like they are on the land, and you get the blood to run to your cells and muscles cleaning also all the waste products out of your body
Remember when aquajogging:
– keep your position staringht up, no leaning forward
– arms on the sides like in running, no pulling with the arms
– create a program with intervals etc. to avoid the boredom
And soon you can see in the mirror your hero again