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During operation this is to be relocated to its more dorsal position c Sketch aid for the faux-profil radiograph: Ch head centre, Cc centre of the acetabulum, Pol obturator foramen left, Spi ant. info iliac spine, Sps ant. sup. iliac spine, Tmi lesser trochanter, Tisch ischial tuberosity. The spherical acetabular reamer is used to widen the acetabulum in the dorsaldistal direction (arrows), while the subchondral sclerosis zone (Sc) is preserved cranially d The upper edge of the transparent paper overlaps the lower end of the iliosacral joint, the medial edge overlaps the symphysis.

For the purposes of comparison, we investigated four measuring techniques that were much less time-consuming [7, 8]. 3 The expenditure:accuracy ratio proved to be particularly favourable for the EBRA (Einbildrontgenanalyse = single X-ray image analysis) method developed by the Innsbruck study group [9]. A precondition for this measuring method are consistently recorded ap pelvic X-rays (Fig. a). Although the regular preparation of usable images requires a certain amount of training on the part of the radiographic personnel, the images can be used both for clinical evaluation and for making measurements - in contrast with the RSA method, in which the radiostereometric images are largely worthless in clinical respects.

6a). The "faux profil" image is then assessed shows a picture comparable to the planning scenario (Fig. 6b,c). 6g). of the operation and any potential problems. The drawing is used to establish the plan and allows certain errors to be identified and corrected before surgery. The surgical team can prepare itself for the procedure, procure the necessary implants and offer their own thoughts during the procedure. If these objectives are to be achieved, there needs to be a clear drawing with large lettering which can easily be viewed by all the team members and which is suspended on the light box next to the preoperative radiographs.