Crutch paralysis
Crutch paralysis is a form of paralysis which can occur when either the radial nerve or part of the brachial plexus , containing various nerves that innervate sense and motor function to the arm and hand , is under constant pressure , such as by the use of a crutch . 
<triplet> Crutch paralysis <subj> paralysis <obj> subclass of <triplet> radial nerve <subj> brachial plexus <obj> part of