United Orthopedic Corporation

Preoperative Planning and Templating II The reconstruction of hip anatomy and restoration of joint biomechanics are the main goals of total hip replacement. A comprehensive analysis of the affected hip is needed. Anteroposterior (AP) and lateral roentgenographic images are crucial to help the determination of hip rotational center and correct component size. Also, an AP roentgenographic image of the pelvis may be necessary to verify preoperative decisions with comparison to the contralateral side. Magnifications of 118 percentage of templates are provided to meet the roentgenographic images. Templating the outline of the component which best fit the acetabulum is recommended, thus an optimal implant position and a correct sizing can be achieved (Fig. 1). The template of acetabular cup should be positioned toward the medial aspect of the acetabulum as possible, simultaneously, keeping in mind that a inherent 2 mm offset of the center of rotation in the U-Motion II + acetabular system. Care should be taken to avoid overlap between the component and the teardrop, any uncovering of the component and more than 45 degree of inclination. However, the final determination should be made depending on the actual condition during surgery. Fig. 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 SCALE : 118% IssueDate : 2014/01/10 *The true hemisphericaldiameter (drawnabove)of the implant is 0.7mm larger than the labeled outsidediameter (O.D.), e.g. 52mm U-MotionII + Cup has a 52.7mm O.D. 46mm 44mm 48mm 50mm 52mm U-Motion II + CUP Tiplasma spray PartNO. 44mm 46mm 48mm 50mm 52mm Cluster-hole 1306-3144 1306-3146 1306-3148 1306-3150 1306-3152 No-hole 1306-3344 1306-3346 1306-3348 1306-3350 1306-3352 U-Motion II +TM CUP with 20º Liner