The success of the hip arthroplasty depends upon good planning and detailed analysis of the parameters which may affect the surgical outcome in advance, as well as the specific condition of the patient and a successful surgical procedure. Preoperative planning, taking into consideration the characteristics of the case is the starting point, which is as important as the execution of the surgery. Medical tests performed in the light of a carefully obtained medical history and a thorough physical examination form the basis of planning. It is crucial that conditions such as infection, which will contradict surgical treatment is not missed. Appropriate radiographs are vital for planning and should be taken in conformity with the standards. Preoperative templating performed on the radiographs determine the placement and the dimensions of the components. Acetabular component must be placed according to the center of motion, using landmarks such as the teardrop figure, ilioischial line, acetabular borders in the pelvis radiograph. Appropriately sized femoral component is determined with templates and the femoral neck osteotomy is performed in order to adjust leg length with reference to the new acetabular center, created with the acetabular implant. The predicted components (size and offset) are made available during the surgery. Planning facilitates the surgeon`s guesswork and prepares him/her for possible intraoperative problems. However, the final decision on the implant type and size is made during the surgery with respect to patient`s anatomy and bone quality.