Self-locking rod system provides a simple, practical and reliable solution endorsed for years of clinical experience. Stem Autobloqueante- HA has a simple rectangular geometry that allows anti-rotational behavior consistent with the requirements. It has a coating of Titanium plasma spray that provides a porous surface with excellent biocompatibility with an optimal structure for bone growth. Also I posed hydroxyapatite coating which favors, as demonstrated, bone osteoinduction. Self-locking Stem-C is a non-cemented prosthesis.