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New Computerized Planning Algorithm and Clinical Testing of Optimized Nuss Bar Design for Patients with Pectus

János György Papp1, Ákos Kiss1, Krisztián Balogh2

  • 1Department of Pediatric Surgery, Traumatology and Burns, Borsod-Abaúj-Zemplén County Hospital and University Teaching Hospital (BKEOK), Miskolc, Hungary.

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|May 18, 2024
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Summary

A new algorithm optimizes the Nuss bar shape for pectus excavatum repair, achieving near-perfect sterno-vertebral distances and high patient satisfaction. This computer-aided design improves surgical outcomes.

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Area of Science:

  • Thoracic surgery
  • Biomedical engineering
  • Medical imaging

Background:

  • Computer-aided design (CAD) is used in the Nuss procedure for bar design.
  • Current CAD methods for Nuss bar shape and length are largely intuitive.
  • A novel algorithm was developed to determine optimal Nuss bar geometry.

Purpose of the Study:

  • To evaluate a new algorithm for designing the optimal shape of Nuss bars.
  • To compare the effectiveness of the algorithm-generated bar shape with existing methods.

Main Methods:

  • Defined normal sterno-vertebral distance from CT scans of non-pectus excavatum (PEx) patients.
  • Marked key points on CT scans of PEx patients at the deepest deformity.
  • Algorithm generated ideal bar shape by fusing circular arcs based on marked points.
  • Compared virtually corrected sterno-vertebral distance with normal values.
  • Manually bent and implanted 10 bars based on algorithm-generated designs.

Main Results:

  • The mean virtually corrected sterno-vertebral distance (10.28±1.27 cm) was not significantly different from the normal mean (10.16±1.35 cm) (P=0.44).
  • All 10 implanted bars were seamless, required no adjustment, and led to shorter operation times.
  • Patient satisfaction score was high at 9.4/10.

Conclusions:

  • The developed algorithm effectively designs an optimal Nuss bar shape.
  • This algorithmic approach can improve the precision and efficiency of pectus excavatum repair.
  • The method shows potential for enhancing surgical outcomes and patient satisfaction in Nuss procedures.