I got your PM, thanks.
Training in itself will help of course, as Tiribulus was eluding to and perhaps intersting to note is that when you train the leg opposite of the injured leg with an emphasis on the negative the injured leg will benefit from that! Waterbury has mentioned this in one of his articles and Poliquin has mentioned it as well, so I agree with Schwarzenegger that you should include the lower body if, of course, possible.
You could include one legged squats for your non injured leg as well as one legged RDL's. Now, depending on how experienced you are you will use your other leg only minimally to balance. If you find that you need your injured leg in any way to counter balance and it causes pain you need to stop right away.
I know Physical Therpists sometimes get a bad rap but for your injured leg, please follow their rehab advice for the next 1-3 months. Old size comes back really fast so with that leg focus on the re-hab and the other leg just work out the way the program dictates (unless of course it hurts your other leg).
Now if it turns out you cannot work your legs you can still stick to upper body exercises only but it seems ubkikely that you cannot work one leg with rehab exercises and the other with the exercises prescribed.