Hi Chocolate. Yes, unfortunately I've owned two horses which were diagnosed with navicular...
The 1st was diagnosed with navicular changes to the bone when she was only 7! It started with slight lameness in one front leg and then gradually progressed to both front feet. She kinda had a straight legged, choppy movement when she trotted. The vet did all the treatment they could as she was insured and then a year or so later we let her go as a companion. (she was only ever supposed to be a project to sell) However, a couple of years ago I came across a photo of her online jumping out on a hunt!! As you can imagine, we were very shocked but we're hoping this means that she's now recovered! Tried everything to find her new owner but no joy. She looked amazing :)
Then, I bought myself an ex-racehorse back in 2007 and 7 months later she went horrendously lame in her front feet. It looked like severe laminatis and was treated as such but she would recover quickly, to perfect soundness, and then a few weeks later she'd be so lame she'd be unable to walk in from the field! The bouts of lameness would come on literally overnight with no warning. She went in to horsepital for x-rays/nerve blocks and, suprise suprise, she was diagnosed with navicular. She did have changes to the bone but her lameness was completly different to my other horses. 3 months of boxrest later and after all the treatment the vet could throw at her... She went lame again :( Vet said pts or try a further 6 months boxrest...we decided on the boxrest and she came out of it sound, and she's still 100% sound over 3 years later in regular shoes and no meds
The same blacksmith shod both of these horses and when the remedial looked at my thoroughbred he said that her feet were horrendous! (i asked my usual blacksmith every time how her feet were and he always said 'they're fine, she actually has good feet for a thoroughbred'!!) The reality was that she had very collapsed heels and one of the bars near her frog had gone. I think his poor shoeing had lamed both my horses. In conclusion, I think it took all those months of boxrest and correct shoeing for her feet to recover and surely if the navicular diagnosis had been correct then neither of these horses would have ever recovered...
I'll try and find and post you a link to an article written by a barefoot trimmer re navicular disease. He says that most horses over the age of 12 or those who have done lots of jumping ect will have navicular changes to the bone and it doesn't mean the end.
Btw, the remedial shoes mad my thoroughbred worse and eventually, against the advice of the vet, she went barefoot which helped a lot.
Sorry for the essay but navicular is like opening a can of worms. Please feel free to ask me anything and I'll try and find you that link. Really hope she makes a speedy recovery xx