Surgery Failures

[EnricoDandolo]

Okay so your telling me my level 12 "Very Strong Expert" Doctor Erika, who is a physicist can fuck up a surgery that badly?
Lemmle just show you my frustration.
Yury was supposed to get a bionic arm, and Erika as my best doctor was sent to install it. She used a glitter world med to do it, but guess what? She somehow manages to stab him IN THE CHEST so badly that he bleeds out in a day. Not only that, but she completely destroys the bionic arm. I really don't understand how that happened.
If my colonist is operating on a patient's arm, they shouldn't "Accidentally" impale them.

[Shurp]

This is a known bug/WAD.  Save scumming or dev mode is the recommended solution.

[grrizo]

It happpened once to me and save scum really helps to find the source of the incidents.
It was a combination between the bad mood of the surgeon and the quality of the medical bed.

[Euzio]

Sucks when it happens but unfortunately, its a known issue. There is a mod which makes surgery less arbitrary.

But it does remind me of all the comical situations that has happened before.

Doctor goes to install a peg leg unto colonist, ends up removing his heart and lung. Or decapitating him 

[Calahan]

This is a known issue as others have said, and in Tynan's own words "It's all messed up in a lot of ways", although it should be sorted for A17. Here is a link to one of Tynan's reddit posts regarding this (and where he confirms the A17 fix).
https://www.reddit.com/r/RimWorld/comments/5ns36b/i_still_dont_understand_the_surgery_probabilities/dceagu5/?context=3