Cemented or non-cemented femoral stem BQS

01. - PRE-OPERATIVE PLANNING The Primary objectives of pre-operative planing arc to: • Determine pre-operative leg length discrepancy. • Assess acetabular component size and placement. • Determine femoral component size, position and fit. • Assess the neccessary femoral offset. In addition, pre-operative planning will assist in the identification of bone abnormalities and potential problems before surgery, that might require special instrumentation. For the A/P X-ray of the pelvis, the femur should be internally rotated 15 degrees to show an accurate view of the femoral neck length, metaphysis and diaphysis. A direct X-ray may also be beneficial in determining implant sizing. 02. - FEMUR TEMPLATING To estimate the leg length discrepancy on the X-ray, a line should be drawn through the bottom of the ischium. The distance should then be mcasurcd from the lesser trochanter to the drawn reference line. The measured différence between each measured side is the radiographie leg length discrepaney. As an alternative reference point, the tip of the greater trochanter to the drawn reference line may be measured. The tapered geometry of the BQS stem should fill the canal from the mcdial to the lateral cortical wall. Draw the neck resection line at the point where the selected stem provides the desired amount of leg length. The proximal tip of the prosthesis and the tip of the greater trochanter are suitable reference points for determining the height ofthe final implant.