hi there!!
to be honest, if you would find a good, well experienced sportsphysio that could be enough. its hard to say anything more about your problem, because this area is such a complex region with lots of small muscles as well as muscle tendons from lower leg area. also a lot of nerv tissue around, fascia and aponeurosis etc. also it is really important to c u weight bearing because the arch of foot and tho whole biomechanics are so important and can cause hundred of problems. so my advice would be forget about Wikipedia reference-linkmri and injection(would only reduce problems for a short period of time) and try to find a good sportsphysio how has the time to sort things out. if that doesnt work out you can still do the mri etc.
all the best!!