Worst clinical cases: techniques and outcomes. A series of case reports from AO Trauma Italy.

Regazzoni P University Hospital Basel, Basel, Switzerland. Electronic address: p_regazzoni@bluewin.ch.
Ruedi T AO Foundation, Davos, Switzerland. Electronic address: thomas.ruedi@aofoundation.org.
Randelli F Hip Department, Orthopedics and Trauma II, IRCCS Policlinico San Donato, S. Donato Milanese, Milan, Italy. Electronic address: filippo.randelli@fastwebnet.it.
Salini V Orthopedic and Traumatology Division, Department of Medicine and Science of Aging, University of Study "G. d'Annunzio" Chieti-Pescara, Italy. Electronic address: v.salini@unich.it.