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Hi everyone I came home from work today to find my little japanese maple on the floor after being knocked over by something and a branch at the top of the trunk has broken or split away at the point of joining the trunk what shall I do as the branch is useless anyway and only there to aid trunk thickening. But I want to keep the other branches on the top. Also if I remove will it heal or will it always look bad at that point now.

I would just take it off and put some cut paste if you have it , I understand that you want to thicken the trunk but leaving that one there might create some reverse taper, to thicken the trunk and create a good taper you want to leave branches lower down on the trunk.
As for the scar I think it will heal pretty quickly as there is lots of growth there .

Ps : if you show a pic of the whole tree it would help better determine the fate of that branch

These where taken before the damage

In the top pic the broken branch is the one on the left at the back. And the next pic it's on the left at the top of the trunk above the lowest branch

It's a very young tree and the branch probably won't be there in a few years time anyway

It's a very young tree that shouldn't be in a pot, I would plant it in the ground and leave it for 5 or so years.
Or, alternatively, slip-pot it into a flower pot that's too big for it so that the roots have loads of room to grow.

Sorry bonsailearner the tree is in a nursery training pot 10 to 20 times the size of the pot it came in when I purchased the tree from a uk bonsai nursery 6 months ago and the plan was to give it one year in this pot to establish a bigger root ball then plant on in the spring next year but thanks for the advice.

remove the branch. Although I would not work with that part of the tree were it mine, you might want to keep your options open. So in that case, it should have been gone already. In your plant, remove all the branches where more then 2 are in one location (Including the trunk). So never have pair of branches from the main trunk. These spots will cretae local thick bulges with is unpleasent in bonsai. In japanese maple you can remove the branches alternating left/right, or remove the centrel shoot.