Sore leg?

[JBM]

2 days ago I was riding my horse Judy who is 21 years old and she was riding strange. Judy usually gets stiff from time to time and a good slow warm up will have her moving nicely but this time it was her front leg. She refused to canter properly on the left rein repeatedly going off the wrong leg (which she never does) but was fine on the right rein. After asking someone to look at her from the ground while I rode we decided she was definitely sore and I hopped off. She doesn’t bob her head and walks completely normal it’s just a slight hop in trot and then seems very sore to canter on the left rein. I left her off work for two days and my instructor thinks she’s just stiff but I’m not sure? She never felt that way before.

She’s also on joint supplements naf glucosamine 10,000 plus with msm
She is also on ironXcell on order of the vet as she had a liver problem around a month ago. She was also on a 10 day liver flush. Unsure if related cuz she was riding perfectly for a few weeks now. Thank you.
Included photos of Judy but have no videos of her limping but can supply tomorrow morning if needed. I have a video but can’t attach it ?

 

[stangs]

If you trot her up on hard and soft ground, which is she worse on?
How much turnout is she getting at the moment; is it possible she tweaked something messing around with another horse?

It doesn't sound like stiffness; if anything it sounds like an issue with the right hind, which might explain why she's struggling to pick up canter on the left rein.

 

[JBM]

If you trot her up on hard and soft ground, which is she worse on?
How much turnout is she getting at the moment; is it possible she tweaked something messing around with another horse?

It doesn't sound like stiffness; if anything it sounds like an issue with the right hind, which might explain why she's struggling to pick up canter on the left rein.

Not sure I keep her mostly in the rubber arena as she is barefoot on the back legs so I don’t like taking her on the road much
No turnout at the moment unfortunately no livery around me offers it this time of year. But when she is out it’s individual turnout because Judy screams at everyone ?
I called the vet so hopefully be out today

 

[JBM]

A video of her trotting

 

[Cortez]

She's as lame as a cat. Get the vet.

 

[JBM]

She's as lame as a cat. Get the vet.

Thank you will do
Today hopefully latest be tomorrow they said they had a few emergencies to deal with

 

[JBM]

Update from vet Judy seems fine so suspected ligament injury on rheumocam painkiller/anti-inflammatory for a week and if no better X-rays are needed as she may have arthritis or an abnormal bone growth