What is medial tibial stress syndrome?

Vague term. This is used to describe a variety of possible underlying conditions such as stress fracture, periostitis, insertional tendonitis, muscle strain, etc.
PEMF. Pulse electromagnetic therapy works very well for periostitis. I had a personal injury due to trying to lift a microwave and scraped this on my shin. The induration and hematoma immediately got better with pemf but the induration lasted total of 10 days. In addition you might need cat's claw and essential fatty acids to relieve pain. Handheld pemf device is available from http://almagia.Com.