Healing process of Type II odontoid fractures after C1-C2 posterior screw fixation: Predictive factors for pseudoarthrosis

Satoshi Yamaguchi; Brian J. Park; Masaaki Takeda; Takafumi Mitsuhara; Kiyoharu Shimizu; Pei-Fu Chen; Royce W. Woodroffe

doi:10.25259/SNI_198_2022

$Healing process of Type II odontoid fractures after C1-C2 posterior screw fixation: Predictive factors for pseudoarthrosis$

Journal article

Open access

Healing process of Type II odontoid fractures after C1-C2 posterior screw fixation: Predictive factors for pseudoarthrosis

Satoshi Yamaguchi, Brian J. Park, Masaaki Takeda, Takafumi Mitsuhara, Kiyoharu Shimizu, Pei-Fu Chen and Royce W. Woodroffe

Surgical neurology international, Vol.13, pp.116-116

03/31/2022

DOI: 10.25259/SNI_198_2022

PMCID: PMC9062960

PMID: 35509583

Files and links (1)

url

https://doi.org/10.25259/SNI_198_2022View

Published (Version of record) Open Access

Abstract

Background: The healing process after C1-C2 posterior screw fixation (C1-C2 PSF) for odontoid fractures is not well understood. Here, we evaluated such processes and identified factors potentially contributing to pseudoarthroses following fusions for Type II odontoid fractures. Methods: Pre- and post-operative cervical radiographs and computed tomography (CT) images from 15 patients with preoperative Type II odontoid fractures who underwent C1-C2 PSF were retrospectively reviewed. Results: CT images identified three areas of bone fusion: The primary fracture site in the dens (9/15 patients, 60%), the atlanto-dental interspace (ADI) (10/15, 67%), and C1-C2 interlaminar space after onlay bone grafting (4/15, 27%). All patients showed bone fusion in at least one of three areas, while only one patient (6.7%) achieved bone fusion in all three areas. With these overall criteria, nine of 15 patients (60%) were considered fused, while six patients (40%) were determined to exhibit pseudoarthroses. Univariate analyzes showed that the preoperative C2-C7 SVA for the nonunion group was significantly larger versus the union group, and bone fusion at the level of the ADI was significantly more common in the nonunion versus the union group. Conclusion: CT studies identified three anatomical areas where bone fusion likely occurs after C1-C2 PSF. Increased sagittal balance in the cervical spine may negatively impact the fusion of odontoid fractures. Further, bone fusion occurring at other sites, not the primary fracture location, through stress shielding may contribute to delayed or failed fusions.

Details

Title: Subtitle: Healing process of Type II odontoid fractures after C1-C2 posterior screw fixation: Predictive factors for pseudoarthrosis
Creators: Satoshi Yamaguchi - University of Iowa
Brian J. Park - University of Iowa
Masaaki Takeda - Hiroshima University
Takafumi Mitsuhara - Hiroshima University
Kiyoharu Shimizu - Hiroshima University
Pei-Fu Chen - Far Eastern Memorial Hospital
Royce W. Woodroffe - University of Iowa
Resource Type: Journal article
Publication Details: Surgical neurology international, Vol.13, pp.116-116
DOI: 10.25259/SNI_198_2022
PMID: 35509583
PMCID: PMC9062960
NLM abbreviation: Surg Neurol Int
ISSN: 2152-7806
eISSN: 2152-7806
Language: English
Date published: 03/31/2022
Academic Unit: Anesthesia; Neurosurgery
Record Identifier: 9984303896002771

Metrics

3 Record Views