United Orthopedic Corporation

3 Cup Insertion Cup orientation Proper implant orientation can be guided by the external alignment system. The U-Motion II + alignment system assists in directing a satisfactory level of acetabular cup abduction and anteversion. Attach the quick connect U-M II Alignment Tower 5 to the cup impactor and thread the Alignment Rod 6 into left/right screw hole of the tower. Firmly secure the acetabular cup onto the tip of the cup impactor. As the patient in lateral side position, make the vertical bar perpendicular to the operating table with the alignment rod parallel to the floor (Fig. 5). The cup impactor subsequently be rotated until the alignment rod is in line with the longitudinal axis of the patient body (Fig. 6). Then, an anatomic positioning of 45° abduction and 20° anteversion is built up. Before implant insertion, attention should be taken as employing a cluster-holed cup where the screw holes must be placed superoposteriorly and/or inferoposteriorly (Fig. 7) for a correct orientation. The laser marks on outer face of the cup helps indicate the position of screw holes. 5. U-M II Alignment Tower, lateral 9206 - 5102 6. Alignment Rod 9206 - 5104 Posterior/Superior Posterior/Inferior Anterior/Inferior Anterior/Superior Fig. 7 Fig. 6 Longitudinal body axis 20º 90° 45° Fig. 5