Yes, and we injected SI twice and stifles once. He also developed PSD on LH after his RF was struggling too much. He was always more sore behind in presentation than the neck. Until he started showing neuro deficits on RF, and we flexed his neck and compressed C6, and he trotted off head bobbing lame. This was 2 years into the saga. I had done Lameness Locator and all the things since I had the vets out all the time anyway to monitor broken shoulder horse’s rehab.
The last time they xrayed his neck, we did the whole right front since he was lame on it. Vet thought he blocked to high block, but I disagreed. They said, well, since you keep saying neck, we will image it one more time. Told me it was normal, maybe some enlargement of the facets compared to before. Radiologist caught the ECVM. Second opinion vet (different sports med specialist) also saw it and was the first thing she wanted to talk about even though he was clearly off on at least 2 legs by this point. Neuro consult also agreed with that opinion on the images.
Anyway, the one rein stuff, anxiety, foot things, and trouble with the canter are all very common for symptomatic ECVM.