Just to revisit this for a moment, and perhaps a medikiwi can set me straight, but cursory searching doesnt seem to indicate that "short knees" is a thing. Though I wouldnt be surprised if he has knock knees.
"Fused spinal cord" also isnt a thing. You can have fused vertebrae (not the whole column or "cord"[sic]), but thats usually the result of surgery, or a side effect of another disorder. When did boog ever have spinal surgery?
Is there actually any proof that fatty was legit on disability and wasnt tugboated by his family?
By "short knees", he most likely means "shot knees". Boogie constantly misspells things and does not correct them, ever, even on his own website, YouTube video titles, descriptions and thumbnails, private messages, and tweets. As an aside, I have long speculated Boogie might genuinely be borderline mentally retarded, at around 80 IQ or so, and that he probably required the assistance of special education services in school, and have doubts that he graduated high school. He is a 50 year old man that is nearly illiterate, and is constantly providing Rickyisms such as screaming that people are "complacent" while meaning "complicit" in a Twitch rant, as well as frequently misspeaking phrases such as "along that lines" and "the mass majority".
I do not know what he means by he has a fused spinal cord, as, like you've said, you cannot have a "fused spinal cord". I have heard him say as an excuse for why he can't get a job, alongside his many other excuses, that his back is "broken". All I have ever seen or heard about this is that many years ago, Boogie fell and broke his shoulder and required surgery. I don't have Twitter so I can't search for "my back" or "back broken", but this guy posts everything about himself online, including a picture of his bare ass when he broke a chair, so if it's not online, it probably didn't happen.
What I do know, however, is that Boogie conveniently got on disability very shortly after his mother passed away. He got on disability at age 37, around two years after Rape Wizard Wanda passed away, coincidentally around how long it takes to be approved/denied for SSDI. What I also know is that Boogie's only ever claims of consistently making money are having "worked in the porn industry" and being a "webmaster" which is, as we all now know, was him running degenerate pedophilic and misogynistic porn blogs he begged for money on. All the while he was consistently housed, eating 5000 calories a day, constantly buying video games and consumerist garbage, maintaining a WoW subscription, blowing $200 at strip clubs and much more, so what's more likely? Boogie's mother, who entrusted him out of all three siblings with her home, provided financial assistance to him until she died, or Boogie made all the money to do all that off the charity of others on a nasty porn blog?
Also, while I'm on this topic, I kind of have solidified my theory of Boogie's childhood abuse history. Boogie's mom most likely favored Boogie if she gave him and only him her house, and in Boogie's words, his brother got abused at an earlier age, and I believe he has said it may have been worse. On top of this, Boogie has said that his mother didn't want to mess him up. I think I'm right on this, but please correct me, as Boogie's told so many different stories I may be making a mistake here, but I believe he's said these things in the past. So what I ultimately believe is that while Boogie probably was physically abused by his mother, it was not as severe as he claimed, and he stole stories from what happened to his brother, and stole the rape and molestation shit from his sister.
We've seen his own brother publicly correct a lie Boogie told about her sister being stabbed, and we've all seen how these things have changed dozens of times over the years. Just recently Boogie said to Turkey Tom that he woke up with a knife in him, when before this, he said he woke up to his mother tracing a knife on him. I've noticed he really harps on the being "stabbed" thing, while one of his big stories is his sister being "stabbed" (which his brother publicly said was not a stabbing, but rather a knife being thrown), and he doesn't appear to have any scars (and if he did he'd obviously show them off), so I think he mixes and matches with what happened to his sister and brother. We've seen how extravagant his claims are, with him saying that his 40+ year old mother
threw him, so I imagine he just takes stories from his brother and sister and greatly exaggerates them.
But, to end this and get off that tangent, Boogie is not physically disabled. He has been constantly fucking around in theme parks, getting on planes and going to conventions, and breaking and throwing shit as Francis for years. He is completely capable of working a real job, and even if he were physically disabled, all he does is fucking sit on a recliner all day staring at his phone, so he's not too disabled to sit for 8 hours at a call center. This is simply an excuse he uses as well as something to elicit pity, which is his master plan, really. I mean look at him - he's obese, disabled, old, autistic, a victim of the internet "abusing" him (he actually said this), he's a rape victim. His tactic is to just roll over and show you his belly, it's pathetic.
But tl;Dr: yes if you had a significant back injury you'd know. This is like Mike Tyson's "sthpinal" moment.