Now a days , one of the critical factors in competitive technology is “time to market” along with full proof design. Use of this Computer aided designing (CAD) techniques in Rapid Prototyping techniques (RPT) techniques shorten the time to market and further for research and development of time of new products. Medical applications are some of the most interesting applications of the rapid prototyping technologies. These technologies are able to produce a physical model of the anatomic structures. This model is very useful for diagnosis, surgery planning, training, and for design and manufacture of the custom implants. This thesis addresses the issue of rapid prototyping CAD/CAM procedures, based on MRI and CT imaging data for custom implants dedicated to hip arthoplasty and the correlation study to be achieved between bone surface, valued by modern imaging methods and the prosthesis form. A set of CT and MRI images are transformed into a digital model using a specialized software package for conversion. The purpose of the research is to obtain prosthesis and the implant with that is completely customizable as per specific needs and have compatible characteristics as close to the physiological with an optimal adjustment of the prosthesis to the bone in which it is implanted, allowing the recovery of the patient physically, mentally and socially.