Hip arthroscopy and the surgical drapes applied. The next step is to insert a fine needle under x-ray guidance into the hip joint. This breaks the 'suction seal' of the joint and allows further distraction if necessary (see fig 4). The surgeon wishes to see the ball move out the socket by approximately 1 cm, so that access to the hip joint can be achieved with minimal risk of damage to the joint surfaces. Most surgeons will inject fluid into the joint at this stage, again to ensure that there is enough space between the ball and socket for safe instrument access.
X-ray of hip dysplasia be drawn in the pediatric pelvis assessing hip dysplasia are as follows: In the adult hip there are important landmarks to be recognized on plain film radiographs (Figure 5): In the adult hip, normal joint space ranges from 3 to 5 mm and must be uniform. Values under 2 mm are consistent with joint space narrowing. The most important measurements are detailed in Figure 6 and Table 1. Figure 6: Acetabular depth value under 250 characterizes the dysplastic hip. In normal conditions the acetabulum covers 75% of the femoral head. This coverage can be determined by three different measurements: lateral