I have posterior tibial tendonitis since december 20th. i've been doing pt and run couple times w/ no pain. can i get back on training for marathon?

Ask the..: People who have examined and treated you. Nameless, faceless online presence doesn't help you. Ask your physical therapist, referring md. Good luck with your run.

Supports in shoes: When recovering back from ppt, it may be prudent to have custom arches to support your posterior tibial tendon (arch) in your running shoes. It's a preventative measure. Since you can already run without pain, return to marathon training but at half pace (1/2 speed, 2x the time for mile amount buildup). These are conservative recommendations. Best of luck!