Painscience.com and Hargrove's "A Guide To Better Movement" are pretty good for a model of predictive processing and the roll of the nervous system in chronic pain and movement. I still don't feel like I have a good model of bone and joint health in general, however. Eg, I'm currently nursing a flare up of patelo-femoral pain in my left knee. I've done a number of things over the past few months to deal with it, with some success, including buying and reading Painscience's book length patelo-femoral tutorial. Recently I've had a bit of pain in my foot, possibly in the tibiocalcaneal or tibionavicular tendons. I find that even though I now know a fair amount about PFS and the way the nervous system processes pain, these models don't generalize well to sporadic, idiopathic pain in another joint.
Possibly the answer is: "lol that model doesn't exist", or "lol wanna get a phd?" but if there are good resources, I'd be an eager consumer.
A sub-question that I'm particularly interested in is: what, if anything, is know about the relationship between base line muscle tone and joint issues? I have good reason to think my baseline muscle tone is higher than average.
Generally, muscles don't determine posture but fascia do. Using muscles to hold posture is unnecessary waste of energy and adds tension to the body. When bad posture gets fascia to stick together via fibrin the factors that are involved in getting it unstuck in more complex then "you have to have strong muscles" or even acting from those muscles.
That doesn't mean that muscles aren't important but "I have a theory that explains everything while completely ignoring the state of the art" just doesn't give you a complete picture.