Magnification of Templating Scale for Components of Total Hip Arthroplasty

Hip joints in radiographs were magnified in order to examine the appropriate magnification of templates for preoperative planning in total hip arthroplasty (THA). The magnification of each hip joint, in postoperative radiographs after THA, was calcurated using inserted implants (socket or femoral stem) as scales. The relationship between the magnifications and grade of obesity or hip flexion contracture was also examined. In most hips, the percentage of magnification was between 110 and 120. Obesity or hip flexion contracture did not influence the magnification. These date suggest that degrees above 110% are more appropriate than 110% for the magnification of templates.