Originally created in the mid 70's by Professor Gilles BOUSQUET in St Etienne (France), the dual articulation acetabular socket rationale has kept improving since then, and offers nowadays a comprehensive solution to intra-prosthetic dislocation. Indicated for primary arthritis patients above 70 years old, for femoral neck fractures whenever the patient is valid and active, for any patient presenting an important hip joint laxity, for patients with irrational behaviour, and for most hip revision cases, the dual mobility concept combines a high level of protection against dislocation and a controled and well documented polyethylene wear rate. Dual mobility and Revision : a blidingly obvious association The intra-prothétique dislocation is a 12 fold occurence in revision arthroplasties compared to primary indications. Because of it, if in primary cases the use of polyethylene based friction couples can be discussed according to the patient, in hip arthroplasty revision cases the double mobility imposes a new standard.