Comparison of Conventional and Digital Templating Technique in Total Hip Arthroplasty

Sung Kwan Hwang; Dong Hyun Kang; Tae Yeon Cho; Chang Ho Lee

doi:10.5371/jkhs.2010.22.1.73

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Hwang, Kang, Cho, and Lee: Comparison of Conventional and Digital Templating Technique in Total Hip Arthroplasty

Original Article

The Journal of the Korean Hip Society

The Journal of the Korean Hip Society 2010; 22(1): 73-78.

Published online: 31 March 2010

DOI: https://doi.org/10.5371/jkhs.2010.22.1.73

Comparison of Conventional and Digital Templating Technique in Total Hip Arthroplasty

Sung Kwan Hwang, MD, PhD, Dong Hyun Kang, MD, Tae Yeon Cho, MD, Chang Ho Lee, MD

Department of Orthopedic Surgery, Wonju College of Medicine, Yonsei University, Wonju, Korea.

Address reprint request to Sung Kwan Hwang, MD. Department of Orthopedic Surgery, Yonsei University Wonju College of Medicine, 162 Ilsan-dong, Wonju 220-701, Korea. TEL: +82-33-741-1351, FAX: +82-33-746-7326, hwtonlka@yonsei.ac.kr

Received 27 July 2009 Revised 20 October 2009 Accepted 30 November 2009

Abstract

Purpose

To examine the effectiveness of digital templating in patients who underwent primary total hip arthroplasty by comparing and analyzing the accuracy of acetate and digital templating.

Materials and Methods

One hundred and nine patients who underwent primary total hip arthroplasty between November 2002 and May 2006 were assigned to the acetate templating group (group I), and 113 patients between June 2006 and April 2009 were assigned to the digital templating group (group II). The sizes of the acetebular cup and femoral stem were examined to determine the accuracy of each method.

Results

In group I, acetabular cup accuracy was found in 46.8% of cases, and 94.5% showed a mismatch less than ±1 sizes. In the case of the femoral stem, accuracy was found in 53.2% and 92.7% showed a mismatch. In group II, acetebular cup accuracy was observed in 43.4% of cases, and 92.9% showed a mismatch below ± 1 size. In femoral stem cases, 46.9% were accurate and 93.8% showed a mismatch.

Conclusion

The accuracy of the digital templating method is equivalent to that of acetate templating, and should replace acetate templating before the operation.

Keywords: Acetate templating, Digital templating, Total hip arthroplasty

Figures and Tables

Fig. 1

Preoperative radiograph of a 52 years old male shows avascular necrosis. (A) This shows measuring acetabular cup by acetate templating using acetate film. (B) This shows measuring femoral stem by acetate templating using acetate film. (C) Postoperative radiograph of total hip arthroplasty shows stable fixation (exactly correct size).

Fig. 2

Preoperative radiograph of a 54 years old female shows avascular necrosis. (A) Scaling. (B) Planning-correction of pelvis tilt based on transischial line. (C) Planning-measuring size of femoral head and femoral canal. (D) Templating-visualization of measured implant.

Table 1

Demographic Data of Group 1, Group 2

Table 2

Accuracy between Templated Size and Actual Implant Size according to Component Type in Two Groups.

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