I haven't seen anything about this before and my Doc was of little help so I'm turning to the experts here.
A couple of months ago I developed something in my right calf that I can only describe as feeling like someone plucking a string in the back of my leg. It happens with I excessively drop my heel (powering up a climb). I can mimic the symptom by dropping my heel climbing up a flight of stairs. Again, only on the right side. If I don't correct during a ride, then my calf hurts for several days after.
The doc suggested a ligament pull, but I wanted to get other opinions.