The plantaris muscle and a portion of its tendon run between the two larger calf muscles ( and ). The Plantaris starts at the knee and runs between the soleus and the gastrocnemius and attaches near the heel.
Plantaris muscle/tendon behind the knee to the heel
In the first picture where I added the arrow is approximately where I felt the original pain when something must have snapped or torn, it is still where I have figured out that it is the most tender to touch and where I feel pain when I move in ways that cause pain. Right now that would be uneven surfaces, inclines and change of direction movements.
Plantaris where it attaches to the heel?
Plantaris location between Soleus and Gastrocnemius
One thing that I haven't chosen to agree with my wife on regarding this injury is the sequence of events that caused it.
Scenario 1 would say that I injured it during the Superior 50 while compensating for a right ankle sprain around mile 2 or 3. I did have left calf pain which started shortly after the ankle roll and it was different than normal and persisted until I missed the cutoff at mile 26.7. I then tore/ruptured it a week later because it was already strained.
Scenario 2 would be no correlation to Superior, merely a coincidence and that I did it by lifting a box out of my car because I am simply getting old. My wife thinks 1, I think 2 but recognize she may be right.
Today, I plan to go for a bike ride and I am debating that maybe this would be a good week to start a car-bike commute to get in some extra exercise. I live 25 miles from work (via car) and a bike commute would be around 28 to 30 miles which on my mt bike might take a bit longer than I could deal with so I am thinking that I might park about midway to work and then bike the rest