Unfortunately my chick had to be put down last weekend as even though I had managed to fix the one leg something else had been happening with its development besides the slipped tendon and it went down on its hocks again. The continued slipped tendon leg was large but not as large as any of the photos that were being shown of slipped tendons and I had been able to move the tendon closer but I had been unsuccessful with getting that bad one in place.
With the “good” leg the chick ended up having that leg rotate causing the chick to be unable to properly straighten or put weight on the leg at all. I’ll attach some photos to see what I mean by it rotating.
These first two photos are what I had come home to one day after work when that morning the chick was at a good point being able to stand on it’s good leg.
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The chick thrived and fought for two and a half weeks old before I noticed a severe decline in quality of life as the chick was being unable to get to and from the water appropriately (even in a tiny controlled environment) as they were unable to maintain proper balance after the leg had finally made the fully 180° rotation, which is what these photos are showing, where the leg had seemed to then stop rotating. It also seemed like it affected the hip and upper leg bones greatly as the chick was unable to stretch or bend that leg much (even assisted) where the other leg had better mobility..
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Are you positive it’s a slipped tendon and not splay/spraddle leg by chance? Are you able to get a picture of the bad leg from the back with the legs clear of the hobbles/splint?
Something like this 
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I’ve come to the conclusion, with posts on here being my biggest reference, that slipped tendons are a very difficult and time consuming issue to treat on a chick. They require a lot of attention and time to get the wrap just right and that it stays in the proper spot. Not to mention the immobilization and thus having to make sure the chick has adequate temperature and enough food and water constantly.
What I’m trying to say is that if it’s truly is a slipped tendon and you don’t have the time or means to support the chick through the healing process (which I’m not too sure how long that even takes now unfortunately with what my chick went through) then it’s most likely better to cull.
THAT BEING SAID !!!
I’m not telling you NOT to try but I would look at some of my other posts where I shared some links for slipped tendons on here. YouTube also has great videos for helping identify a slipped tendon in a chick and thus how to treat it.
I never actually fully restrained my chick with the teddy bear by having straps or anything holding it in, I just wedged the chick in between the legs and hoped for the best (with a soft enough landing provided if they did happen to get wiggly and flip out or something 

).
I was never able to make a proper sling for the chick to sit in as it just wiggles out constant or even a proper box set up as we burn our cardboard rather frequently when we do have any.
I do hope you are able to provide the best for your chick and I do deeply apologize but I am unsure if I am a great help or if what I said was useful but I am rooting for you and your little one 

