Calibration Marker Position in Digital Templating of Total Hip Arthroplasty

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• 作者：Christoph K. Boese ; MD^a ; ; Jan Bredow ; MD^a ; Jens Dargel ; MD^a ; Peer Eysel ; MD^a ; Hansjö ; rg Geiges ; MD^b ; Philipp Lechler ; MD^c
• 关键词：total hip arthroplasty ; templating ; calibration ; digital radiography ; hip anatomy
• 刊名：The Journal of Arthroplasty
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：31
• 期：4
• 页码：883-887
• 全文大小：816 K

文摘

We report a mathematical method to assess the vertical and horizontal positions of spherical radiopaque objects of known size in conventional radiographs.

Methods

The reliability and validity of the method were tested in an experimental setting and applied to 100 anteroposterior pelvic radiographs with external calibration markers and unilateral total hip arthroplasty (THA).

Results

We found excellent reliabilities; intraclass correlation coefficients for interobserver and intraobserver reliabilities were 0.999-1.000 (P = .000). The mean normal height of THA was 198 mm (range: 142-243 mm, standard deviation: 18 mm) above the detector. Vertical and horizontal external marker positions differed significantly from the true hip center (THA; P < .001 and P = .017).

Conclusion

This method could enhance patient safety by enabling automated detection of malpositioned calibration markers by templating software.