Need help with a tree

I had a pear tree, the type that grows on one long banch (sorry cant remember what they are called) 

Any way in the second year hubby had an accident and dropped a huge post which fell and snapped the complete tree off about 6 inches above the ground.

I was in two minds about taking it out and replacing it but we didnt we left it, this year its come back to life and re-grown with branches that now fan out instead off one branch. ( dont think that will make much sense) but my question is, it was the same variety as the one further along the bed, but the leaves which are very healthy are very different. My other pear tree has shiny leaves, which are a very dark green, the damaged tree has paler leaves that are matt rather than shiny, it hasnt blossomed at all, and shows no buds, flowers or signs of fruit

Yes,

it sounds very much like it's snapped off at the grafting point (it's a weak point and usually at about 6" off the ground) and you just have the rootstock growing which isn't going to be much use as I believe it's usually a quince type for pears.

Unless the growth is from above the graft point then you probably need to dig it up and start again. 

The graft point is where the root-stock of one variety joins the trunk of another variety.  The point of this is to use a good rooting plant to join with a good fruiting one.  Basically it is two plants "grafted" together.

If you have lost the top half, the bottom may still sprout, but it is unlikely to be as productive even after time. 

I agree with Nobbie.  Probaby best to dig it up and start again.