The consequences of failure are severe: If your check result fails by 5 or more, the installation or removal of the 
cybernetic attachment causes undue physical trauma to the patient, who suffers 1d4 points of Constitution 
damage. If the check result fails by 10 or more, the Constitution 
damage is treated as Constitution drain instead.
 
A character who undergoes cybernetic 
surgery (successful or not) is fatigued for 24 hours. Reduce this time by 2 hours for every point above the DC the surgeon achieves. The period of fatigue can never be reduced below 6 hours in this fashion.