The role of clivus and atlanto-occipital lateral mass height in basilar invagination with or without atlas occipitalization.

Basilar invagination (BI) is a common deformity. This study aimed to quantitatively evaluate the height of clivus and atlanto-occipital lateral mass (LM) in patients with BI with or without atlas occipitalization (AOZ). We evaluated 166 images of patients with BI and of controls.

Basilar Invagination: A Tilt of the Foramen Magnum.

Objective: Congenital basilar invagination (BI) is a craniocervical deformity marked by odontoid prolapse into the skull base. The foramen magnum angle (FMA), which is formed by the Chamberlain's line and McRae's line, has not been fully studied. The study aimed to investigate the FMA and its relationship with other craniocervical parameters.

Biomechanical evaluation of subaxial lateral mass prothesis: a finite element analysis study.

Pathologies of the lateral masses could lead to bone destruction of the cervical spine. Their treatment includes lesion resection and fixation. However, the resulting bone defect of a lateral mass is often neglected, resulting in difficulty in bone fusion.

A Safe and Effective Posterior Intra-Articular Distraction Technique to Treat Congenital Atlantoaxial Dislocation Associated With Basilar Invagination: Case Series and Technical Nuances.

Background: The management of atlantoaxial dislocation (AAD) associated with basilar invagination (BI) is challenging, and traditional posterior-only approaches lack the ability to release the anterior soft tissue resulting in unsatisfactory reduction. Furthermore, vertebral artery anomalies and deformed anatomy increase surgical risks.

Objective: To introduce a safe and efficient technique to reduce congenital AAD and BI through a single-stage posterior-only approach.

Quantitative Reduction of Basilar Invagination With Atlantoaxial Dislocation by a Posterior Approach.

Objective: This study evaluated the feasibility and efficacy of quantitative reduction and fixation to treat basilar invagination (BI) with atlantoaxial dislocation (AAD).

Methods: Posterior occipitocervical angle (POCA), occiput-C2 angle (Oc-C2A), clivusaxial angle (CAA), and C2-7 angle (C2-7A) were considered for quantitative reduction. Twelve patients with BI complicated with AAD received posterior interarticular release and individualized cage implantation to restore vertical dislocation.

Compression-distraction reduction surgical verification and optimization to treat the basilar invagination and atlantoaxial dislocation: a finite element analysis.

Background: Basilar invagination (BI) combined with atlantoaxial dislocation (AAD) leads to foramen magnum stenosis and medullary spinal cord compression, causing nerve dysfunction. The purpose of the surgery is to remove the bony compression at brainstem ventral side and fix the unstable spinal segment and make it fused stably. Occipital cervical internal fixation system that simultaneously reduces atlantoaxial horizontal and vertical dislocation are established.

Applications of pelvic 3D reconstruction and dimension measurement to colorectal cancer surgery.

Three-dimensional visualization is opening new worlds for more precise diagnosis and higher-quality treatment. 3D reconstruction from medical images is widely used in diagnosis and medical research. This paper focuses on 3D surface reconstruction of the pelvis from CT images on a personal computer.