What sort of injuries might someone suffer if they were kept like this for extended periods of time?



In case it isn't clear, they're kneeling flat on the ground (so no suspension in that respect), but their hands are shackled behind/above their back, and a chain between them (shown below) means the body's being kept from slumping/falling any more forward by the hands/arms.



There is give to the chains, such that if the torso is raised into an upright position the arms will come down against the back.
This is from a movie and if the scene is left to play, somebody comes in and easily raises the captive into that position by holding them by the chest and back at shoulder height, and shifting their torso upright.

It's unclear if the captive could pull themselves up, though it was effortless for the other person to do so, so I'm thinking it likely they could shift positions themselves (at least ahead of fatigue setting in).

To be brief, the arm muscles would grow stiff and potentially cause irreparable damage. The legs would suffer from a lack of proper circulation and become hard to straighten. The neck and back muscles would also suffer.

Edit: I am not a physician, just a humble house wife.

What if your hands were just shackled behind you (you could change position freely besides that); could that cause any serious injury after prolonged captivity like that?

When you're a writer...