Such a vulnerable, exposed and helpless position.
From Wikipedia:
“The strappado, also known as corda, is a form of torture in which the victim's hands are tied behind his back and the victim is suspended by a rope attached to the wrists, typically resulting in dislocated shoulders. Weights may be added to the body to intensify the effect and increase the pain….”…
In bdsm, strappado is potentially dangerous if done without proper care. Strappado can be so very effective as a method of restraint, control, and punishment. It depends greatly on the flexibility and health conditions of the person being bound.
Take care and enjoy.