Arnier,

Can I ask how you came to conclusion that it was failed regeneration of the semitendinosus? Did you have investigations or was it a clinical diagnosis?

From reading the posts up until the last one I was swaying more towards a neural tension disorder of the sciatic nerve (tibial branch perhaps) - this may explain the distal foot symptoms and local. However without more info you have to consider the hamstring to be the most likely source - so good luck with your rehab and ortho review.