The usual caveat with wrist ties is to leave a little wiggle room to avoid cutting off circulation. However, this is by no means the biggest problem, at least not in the sort of time frames we are likely to be talking about. There’s no doubt you can cause a lot of damage if you do an effective job of cutting of the blood supply for a long period and that numbness can deprive you of other warning signs. The main thing to watch out for is damage to the radial nerve by pressure and/or shearing forces, i.e. when rope is dragged under pressure over a nerve. Pressure tends to cause progressive damage but a shearing force can tear the nerve causing instantaneous injury. Anyway, the following will show you exactly where these nerves actually run on real person, not just on a theoretical diagram [private]
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