Radially Displaced Perilunate Injuries: A Report of Two Cases.

We present two unusual cases of radially displaced perilunate dislocations, one of which involved acute ulnar nerve compression requiring Guyon's canal release. The first case underwent closed reduction and cast immobilization but developed scapholunate instability, necessitating secondary ligament reconstruction. The second case, treated with open reduction and fixation, resulted in persistent volar intercalated segment instability of the proximal row and ulnar nerve paresthesia 1 year after surgery.