Accuracy of a Simple Digital Templating in Primary Uncemented Total Hip Arthroplasty<sup>△</sup>

Si Hai-bo; Zeng Yi; Cao Fei; Pei Fu-xing; Shen* Bin

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Accuracy of a Simple Digital Templating in Primary Uncemented Total Hip Arthroplasty^△

Chinese Medical Sciences Journal Vol. 30, Issue 3, Pages: 150-155(2015)

Orginal Article | Updated：2024-04-10

- Accuracy of a Simple Digital Templating in Primary Uncemented Total Hip Arthroplasty^△
- Affiliations：
  
  Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu 610041, China
- Author bio：
- Funds：
- DOI：
  CLC：
- Published Online：20 June 2015，
  
  Published：2015-06
- Accepted：
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Si Hai-bo, Zeng Yi, Cao Fei, et al. Accuracy of a Simple Digital Templating in Primary Uncemented Total Hip Arthroplasty^△[J]. Chinese medical sciences journal, 2015, 30(3): 150-155.
DOI：

Si Hai-bo, Zeng Yi, Cao Fei, et al. Accuracy of a Simple Digital Templating in Primary Uncemented Total Hip Arthroplasty^△[J]. Chinese medical sciences journal, 2015, 30(3): 150-155. DOI：

摘要

Abstract

Objective

To introduce a simple preoperative digital templating in uncemented total hip arthroplasty (THA) and to determine its accuracy for preoperative size selection of the prostheses.

Methods

A prospective study of digital planned THAs was performed on 90 hips with different types of prostheses from August 2013 to Angust 2014. The plastic templates of different types of prostheses were scanned for desired digital templating and the scanned images were then processed to the transparent

digital templates using Photoshop software. We calibrated the scales of the digital templates with the preoperative radiographs

and then selected the right size of the component. The preoperatively digital planned component sizes were compared to the actual sizes used in the operation

as well as the preoperatively traditional planned sizes.

Results

In either cup or stem templating

no difference was found among the groups with different types of prostheses

and the accuracy of digital templating was statistically higher than traditional templating. In cup templating

digital planned and implanted cup sizes were identical in 43.33% of the cases

78.89% of the cup sizes were predicted within 1 size (± 2mm) and 95.56% were predicted within 2 sizes (±4 mm)

all significantly higher than the results of traditional planned sizes (30.00%

=0.044; 61.11%

=0.007; 82.22%

=0.004). The exact femoral stem size was predicted in 40.00% of cases using the digital templating

84.44% of stem sizes were predicted within 1 size

and 93.33% within 2 sizes

better than using traditional templating (25.56%

=0.028; 53.33%

0.001; 77.77%

=0.003).

Conclusion

This simple digital preoperative templating is an accurate and reproducible process to preoperatively predict the implant size of uncemented THA.

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references

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