I broke one of my front teeth 10 years ago after a minor bike
accident. I got fitted with crowns and I have replaced it twice, last
time 4 years ago. It is a crown with a long metallic post that goes
into the root of the tooth.

A few months back the tooth became loose and came out. I went to a
dentist and he took an x-ray. From the x-ray it looks like the
metallic post is broken in the middle. Almost half of the post seems
to be in the root of the tooth. The dentist put a little bit of
paste / cement around the half of the post that is remaining and
reattached the tooth. He said it is not likely to stay for long. Sure
enough two months later it has come off again.

I am wondering what my options are at this stage. Is there any way to
extract half of the post that is embedded in the tooth and fit a new
crown and post. Or is implants the only option now?
Any information regarding this would be greatly appreciated.