Guide wire insertion
As a first step a guide wire for the condylar screw is inserted proximally.
Therefore, the aiming device is lined up parallel to the femoral neck in both the axial and the AP views, the guide wire should be aimed at the lower portion to the femoral head.
The wire is advanced to just short of the subchondral bone of the femoral head. Its position is checked fluoroscopically in two planes, and adjusted, if necessary.