When should I start working out with a plantar plate sprain?

Plantar plate injuries are one of the most difficult injuries for runners. 

The reason is that they can take a long time to get better. Every time you take a step, you're applying direct pressure to the plantar plate ligament. 
 
Every time your heel comes up off the ground, you bend the toes, and you're stretching the plantar plate ligament. 
 
The plantar plate ligament doesn't really have a great blood supply, and they can be extremely frustrating for runners. So the big question is: 
 
When can I start working out if I have a plantar plate sprain? 
 
Well, that's what we're talking about today on the Doc On The Run Podcast.