Combining foot and body exercices, new trainers (vivo stealth) and a very cautious training plan ("starting again" at 1k, and increasing progressively), I imagined myself aiming to try and run 10k barefoot again before the end of the year.
Were you true barefoot or shod (Vivos or other) when you first experienced the pain in your left foot/toes?
So he suggested me to look for other solutions and come back to him as a last option.
He suggested that you do the legwork and find other solutions instead of his looking? He's either lazy or uneducated about MN.
With the fisio we combined foot massages with currents, foot exercises...
Do you mean currents as in electricity (electroshockwave therapy)? If so, you should never apply electricity to an injured nerve. This is what was told to me by a pioneer in peripheral nerve surgery/technology, Dr. A. Lee Dellon (first to ever map the peripheral nervous system...).
He quickly confirmed the neuroma, afirmed there was a biomechanical reason behind it and concluded that his idea would be to use insoles to correct posture and reduce pressure on the metatars.
What sort of biomechanical issue did he say you have exactly?
Those of us who have MN are predisposed to it genetically; we have a narrowing of the metatarsals. When we wear certain types of shoes (tight toe boxes and elevated heels), we compress our metatarsals into the nerves that run between them. The types of shoes we wear are the number one cause of MN. If we had stayed barefoot from birth, we never would have developed this condition.
He estimated in 80% the probability of being able to run again, but definitely not barefoot. On the contrary, according to his advice, I was to switch back to "traditional running shoes" avoiding any running style based on metatars footsteps.
It seems they always say 80/20 for any treatment.
That is some of the worse advice anyone could give. After I developed MN, I found I was able to run much further barefoot (real, true), 17 miles, before the MN pain would set in. I could only get not even a mile with shoes on. Traditional running shoes are among those types of shoes that are the worse for us to wear. It sounds like he is recommending you run on your heels and avoid your forefoot. Heelstriking, shod or barefoot, is not a good idea for anyone.
Do you think the transition could have caused the Neuroma or it comes from before that?
I answered this above.
Do you think the best solution in my case is using insoles and stick to traditional footware, even though that may injure my knees?
I answered this above.
Or should I carry on with the transition patiently and reinforce my feets muscles and tendons with exercises?
I DEFINITELY think you should continue on with barefoot running AND living but with NO transition. Instead, go cold-turkey, all-out, forget the footwear completely (except only the healthiest when truly needed), and progress slowly. I wish I had gone that route, but instead, I, like so many people in our culture, was brainwashed into thinking I needed footwear to run. When I began experiencing the pain, I immediately began a ton of treatments that included custom-casted orthotics with metatarsal lift pads, cortisone, alcohol sclerosing injections, electroshockwave therapy with numbing injections, cryosurgery, traditional surgery, deep tissue massage (when they grew back into stump neuromas), and finally corrective surgery to relocate the two main nerve branches into my arch muscles (all of which added more and more scar tissue the the nerve sheath, which is what MN is, scar tissue). I believe that if I had stayed barefoot from the first onslaught of pain and never chased down all these treatments and surgeries to remedy the condition, I would be fine today! Don't do what I did. Don't be brainwashed. You don't need shoes to run, to live. Live barefoot and avoid doctors. See how far you can get in life.
BTW, MN Talk is the only forum dedicated to Morton's Neuroma. NOTE: Morton's Neuroma is not a true neuroma (tumor); it's a perineural fibroma (fibrous tissue formation around nerve tissue.) and was first correctly described by a chiropodist named Durlacher.) There is literature that suggests changing the name of this condition. Check out MN Talk. See my signature. Hope to have you join us there!