New, can't find articles (resolved) .

Hello Mb,
I think the problem is that there is not really an “extensor ligament”, there is a extensor tendon and many ligaments (the suspensory being the largest). Let me direct you to the menu with articles on diseases of these structures,

https://horseadvice.com/horse-equine/diseases/lameness-in-horses/diseases-of-the-lower-limb/

and to articles on anatomy ,

https://horseadvice.com/horse-equine/reference-material/equine-illustrations/muscoskeletal-anatomy-and-conformation/lower-limb-anatomy-front-and-rear-limbs/

You may have to copy and paste these urls into your browser. Thanks for you patience,
DrO