Glad the damage was minor -- just a flesh-wound. [&:]

As for the cause, I'm suspicious about a broken aileron hinge -- that is not usually a disaster, unless the aileron actually tears loose in flight & drags in the slipstream -- even then it is very often controllable.

I'm not trying to insult you, but is it possible that you took off with the antenna down?

Another possibility is that you had the aileron servo reversed at the Tx. I don't know which radio you have, but if it is an analog unit, you may have inadvertently bumped the aileron servo reversing switch.

Was your Rx battery too low?

It is also possible that you had a Rx battery failure, or a battery connection failure (either a connector, or the switch).

Was your Tx battery fully charged, or had you been flying for several sessions before recharging?

It is well worth fully exploring all possibilities, so that it can be absolutely determined what went wrong.