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Osteosynthesis and Trauma Care 2003; 11(1): 29-34
DOI: 10.1055/s-2003-40120
Original Article

© Georg Thieme Verlag Stuttgart · New York

Experimental Comparison Between Computer Assisted Surgery (CAS) Based and C-Arm Based Correction of Hind- and Midfoot Deformities

M. Richter1
  • 1Trauma Department, Hannover Medical School, Hannover, Germany
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Publication History

Publication Date:
20 June 2003 (online)

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Abstract

This experimental study compares the accuracy of Computer Assisted Surgery (CAS) based correction of hind- and midfoot deformities, and C-arm based correction. Five specimens of three different deformity models (Sawbone™) were corrected with each method and the results were compared. The specimen visualization during correction was exclusively provided by the C-arm or CAS screen.
The shape was graded normal in all corrected specimens (n=15) in the CAS group, and in eight of the specimens in the C-arm group (Chi2-test, p=0.05). Parameters (t-test utilized): time entire procedure, CAS, 782 (450-1 020) s, C-arm, 410 (210-600) s, p < 0.001; fluoroscopy time, CAS, 0s, C-arm, 11 (8-19) s, p < 0.001; measurement differences between corrected specimens and normal specimen model: foot length, CAS, -1.7 ± 1.9 mm, C-arm, -4.1 ± 3.8 mm, p=0.03; length longitudinal arch, CAS, -0.9 ± 0.9 mm, C-arm, -5.6 ± 4.9 mm, p =0.001; height longitudinal arch, CAS, -0.1 ± 0.5 mm, C-arm, 1.7 ± 4.3 mm, p=0.14; calcaneus inclination, CAS, 0.1 ± 1.4°, C-arm, 2.7 ± 4.8°, p=0.05; calcaneus length, CAS, -0.5 ± 0.4 mm, C-arm, -2.8 ± 1.3 mm, p=0.005; Boehler's angle, CAS, 0.4 ± 1.1°, C-arm, 4.1 ± 8.6°, p=0.37.
CAS promises to be a valuable tool for higher accuracy for correction or reduction in the hind- or midfoot region. Clinical studies must show if this higher accuracy can be achieved in real operations also, and if this leads to better clinical results.

Key words

Correction - Deformity - Midfoot - Hindfoot - Fluoroscopy - Navigation System

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