Hock lameness - bone cyst and arthritic changes

[CM.]

Hi, researched as much as I can but firstly wondering what's a recommended joint supplement and must be competition legal?
My mare was dragging her near hind toe a week ago on Monday so got the vet out and she had x-rays to show a bone cyst in her hock joint which has caused arthritic change. The change and cyst was in the small hock joint (sorry not using correct names but having a blank minded day in taking anything in)...

They have recommended a treatment of a Tildren drip and cortisone injection. She is also to be put onto a joint supplement and is currently on danilon until she gets the treatment over next 2 weeks.

I am allowed to do light schooling and hacks, but am I best to do the schooling in a rubber surface as this is where she was least lame? Unfortunately I usually ride in the field and worried about this being too hard.

I know there's loads to read up on this but would love some specific feedback and up to date on the treatments, along with a recommended joint supplement? Also been mentioned to use a raised heel on her shoes next time farrier comes out.

Last thing to mention is the vet talked about surgery, but would mean a year off? Vet didn't seem so keen.

With the tildren drip and cortisone injections be treating the cyst or the arthritic changes as not so sure on this? Is there a chance if she responds well of her jumping, hunting and doing high level dressage/tight circles so on?

She is my sole responsibility as she is only 6 years old and all though he said she may have a short lived career, I can't face to see her passed on or sold just because she can't compete up to what I had hoped. But any advice so I can manage her to the best I can will be great.

Huge thanks in advance. Sorry if seem a little dumb on all this but the first after owning horses all my life I have had to go lame so not quite used to all this or how to go about it.

[amymay]

Personaly I would stick to light work in the field or on the road. With no work on a surface. As for joint suppliments, as far as I'm aware synaquin is the best.

[Carefreegirl]

As amymay, mine was diagnosed arthritis couple of months ago and vet said walk and trot out hacking, no more than 40 minutes and def not in a school and no tight circles.