Using digital templating to predict the size of prosthesis in total hip arthroplasty.

Abstract

Objective To evaluate application of the measurement methods of digital templates to select an hip prosthesis. Methods From January 2005 to February 2007, 122 patients (132 hips), including 68 males and 54 females, were studied. The hospital network system of digital imaging and digital templates on the computer were applied in preoperative template measurement of total hip replacement. For the sur-geon group and radiologist group, digital template measurements were used to predict the required size of models, and to compared with the actual prosthesis used in the operation. Results Surgeon group acetabu-lar prosthesis model and femoral prosthesis model hefore and after surgery were no significant difference be-tween measurements (Z=0.4531, P=0.6505; Z=0.5452, P=0.5856). Surgeon predicted preoperative acetabular prosthesis model with intraoperative acetabular prosthesis significant correlation between the models (r= 0.9361, P=0.0068), preoperative surgenn predict femoral prosthesis model with intraoperative application of femoral prosthesis significant correlation between the models (r=0.9435, P=0.0087). Acetabular prosthesis model and femoral prosthesis model of radiologist group, before and after surgery, were no difference between measurements (Z=0.6834, P=0.4934; Z=0.1027, P=0.8990). Radiologist preoperative prediction model of ac-etabular prosthesis with intraoperative acetabular prosthesis significant correlation between the models (r= 0.9214, P=0.0051), preoperative radiologist prediction model with the femoral prosthesis surgery Application of femoral prosthesis significant correlation between type (r=0.9357, P=0.0072). Total hip arthroplasty using the digital measurement of choice prosthesis template model and the practical application of prosthesis surgery models, compared acetabular prosthesis accuracy rate of 71.59%, femoral prosthesis 78.04% accura-cy rate. Conclusion The measurement of preoperative digital template design, selection of artificial total hip replacement prosthesis with high aeeuraey and credibility. Key words: Arthroplasty,replacement,hip; Image processing,computer-assisted; Hip prosthesis