Hi Sophie,
sorry to hear that you broke your anke, but from the sound of it your on the way to running again.
To answer some of your questions:
1) Depending on the age and usuage of your old trainers, this could result in you suffering from blisters and knee pains. Knee pains are generally the first sign that trainers are worn down or simply the wrong shoe for you
2) The GelKayano 18 is not extreme over pronators, it is for mid to full pronators.
3) If your gait was analysed as a neutral runner with only one side pronating only just slightly, than a neutral shoe would be the best option. I would not use any shoes that gives you any support.
4) I would recommend a neutral shoe such as a nimbus for example, that is if you want to stick with Asics for example. There are of course plenty of other neutral shoes available on the market all different in fit and distance build for.
On another note, I highly recommend for any neutral runner to stay away from any shoes that are designed for runners who pronate, simply because if you don't need any arch support you should not have any. To much arch support will result in the long term in knee problems and shin splints. Your comment that wearing structured shoes coud mess with knees/hips and ankles is absolutley correct.
I hope this helps.
