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Morphometric analysis of the C1-2 zygapophysial joint in atlantoaxial dislocation patients with sandwich fusion of the craniovertebral junction.
Neurosurg Rev
January 2025
Department of Orthopaedics, Peking University Third Hospital, Beijing, China.
The combination of congenital C1 occipitalization and C2-3 non-segmentation (i.e. "sandwich fusion") results in early development of atlantoaxial dislocation (AAD).
View Article and Find Full Text PDFThree-dimensional kinematic analysis of the cervical spine following posterior atlantoaxial fusion under physiological loading: An in vivo study.
Clin Biomech (Bristol)
January 2025
The Orthopedic Hospital, The First Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi, China. Electronic address:
Background: This study aimed to analyze the three-dimensional cervical motion characteristics in patients who underwent posterior atlantoaxial fusion surgeries using cone beam computed tomography and 3D3D registration technology.
Methods: The study selected 20 patients who underwent posterior atlantoaxial fusion surgery and 20 healthy people as the control group. All subjects underwent cone beam computed tomography scans of the occipital and cervical spine in 7 different functional positions, then 3D3D registration of Occipital-C7 was performed at each functional position to calculate the motion characteristics of each segment.
Novel MRI Signs in Atlantodental Space Predict Reduction Degree of Atlantoaxial Dislocation.
Orthop Surg
January 2025
Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, Sichuan, China.
Objective: The type of atlantodental space tissue in patients with atlantoaxial dislocation (AAD) can help doctors understand the possibility of reduction before surgery. However, relevant research on this topic is lacking. This study aimed to summarize cases of AAD, classified based on the atlantodental space using magnetic resonance imaging (MRI), and preliminarily explore its impact on the degree of reduction.
View Article and Find Full Text PDFBiomechanical differences of three cephalic fixation methods for patients with basilar invagination and atlantoaxial dislocation in the setting of congenital atlas occipitalization: a finite element analysis.
Spine J
February 2025
Spine Center, Sanbo Brain Hospital, Capital Medical University, Beijing, 100093, China. Electronic address:
Article Synopsis
- The study examines the biomechanical differences of three cranial fixation methods in patients with basilar invagination-atlantoaxial dislocation (BI-AAD) complicated by atlas occipitalization (AOZ).
- It presents findings from finite element analysis on a specific patient, comparing C1-C2 fixation, occipitocervical fixation, and an occipital plate fixation regarding range of motion and peak stress.
- Results indicate that C1 lateral mass screws offer reduced movement in lateral bending and axial rotation but come with higher stress, while the occipital plate group shows the most movement and lowest stress.
Database Review of 514 Patients with Os Odontoideum. Detailed Analysis of 258 Surgically Treated (1978-2019).
Adv Tech Stand Neurosurg
September 2024
Department of Neurosurgery, University of Iowa Hospitals and Clinics, Stead Family Children's Hospital, Iowa, USA.
Objective: Database review (1978-2019) is to identify the cause of os odontoideum, its presentation, associated abnormalities, and management recommendations.
Methods And Materials: Review of referral database of 514 patients and 258 surgically treated patients ages 4-64 years. Detailed history of early childhood trauma and initial encounter record retrieval were made.
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