The atlantoaxial joint (AAJ) links the first cervical vertebra, known as the atlas (C1), to the second cervical vertebra, termed the axis (C2), forming the most flexible section of the spine. This joint consists of three synovial joints: a single median pivot joint and two lateral plane joints.

The atlanto-axial joint is a joint between the atlas bone and the axis bone, which are the first and second cervical vertebrae. It is a pivot joint that provides 40 to 70% of axial rotation of the head.

Oct 30, 2023 · The atlantoaxial joint is a complex joint between the atlas (C1) and the axis (C2). It is composed of three synovial joints; one median atlantoaxial joint and two lateral atlantoaxial joints. The median atlantoaxial joint is formed between the dens of axis and an osteoligamentous ring of the atlas anteriorly and transverse ligament posteriorly.

Aug 28, 2023 · The atlantoaxial joint is a type of synovial joint that is classified as a uniaxial pivot joint. This joint resides in the upper part of the neck between the first and second cervical vertebrae, also known as the atlas and axis, respectively.

Jul 7, 2021 · The Atlantoaxial Joint (AA) is formed by the union of the C1 and C2 bones. The Atlantoaxial Joint is composed for three small joints. Medial AA Joint; Two lateral AA Joints; The Atlantoaxial Joint is composed of cartilage, ligaments, muscles and tendons. The principal function of the Atlantoaxial Joint is rotation.

Aug 20, 2024 · The atlanto-axial articulation is a complex of three synovial joints, which join the atlas (C1) to the axis (C2). The atlanto-axial joint allows 10-15 o of flexion/extension, 30 o of axial rotation and only minimal lateral flexion. There are a number of congenital anomalies which can affect the atlas, axis and the joint between the two:

Oct 28, 2024 · The atlantoaxial joint is an important "transitional zone" in the cervical spine

Jun 12, 2023 · Instability in this joint is usually congenital, but in adults, it may be due to an acute traumatic event or degenerative disease. Atlantoaxial instability can be classified into three generalized categories: inflammatory, congenital, and traumatic.

The AA joint is responsible for 35 degrees of rotation bilaterally, 8 degrees of flexion, and 10 degrees of extension. There are two methods that are commonly used for assessing motion at the AA joint.

The AA joint articulates the atlas (C1) with the axis (C2) and constitutes the C1-C2 joint. The AA joint slopes caudally and laterally (Figures 15-2 and 15-3). Unlike the lower cervical segments, the AO and AA joints lack intervertebral discs and uncinate processes.