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Fig. 1 | Journal of Orthopaedic Surgery and Research

Fig. 1

From: How to reconstruct the lordosis of cervical spine in patients with Hirayama disease? A finite element analysis of biomechanical changes focusing on adjacent segments after anterior cervical discectomy and fusion

Fig. 1

The three-dimensional finite element models established in this study. a The C4–6 PWA of healthy volunteer in this study was 8°. b, c Reduce or increase C4–6 PWA by 2°. d, e The front and side view of the model of NLCS. f-l.The front view of the model of NLCS + C4–6 ACDF (F), NLCS + C5–7 ACDF (g), LCSHD (h), LCSHD + C4–6 ACDF (i), LCSHD + C5–7 ACDF (j), LCSHD + C4–6 ACDF + C4–6 PWA 6°(k), and LCSHD + C4–6 ACDF + C4–6 PWA 10°(l). ACDF, anterior cervical discectomy and fusion; NLCS, non-pathological lower cervical spine; LCSHD, lower cervical spine of Hirayama disease; PWA, posterior wall angle

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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X