Is it in a cast or pinned and in a sling?
A cast can be heavy and literally alter your stride.
If its in a sling that can do the same too.
As your probably aware you need your arms to swing free to create tempo and maintain cadence and drive for want of a better word.
After the few weeks are over see how you fair. Start with slow easy recovery jogs a good minute slower than your easy run pace. See how it goes. If you find that your favouring one side or the other you may have to think seriously about knocking it on the head. A marathon is a long way to run if your slowly leaning to one or other side. You need your mechanics to be near perfect.
Remember you have not wasted that training.
Your maybe just not cashing in the cheque this time
