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.

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.

Synovial joints allow for free movement between the bones and are the most common joints of the body. The functional classification of joints is determined by the amount of mobility found between the adjacent bones.

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:

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.

Sep 5, 2024 · There are two joints unique to the cervical spine – the atlanto-axial (x3) and atlanto-occipital joints (x2). The atlanto-axial joints are formed by the articulation between the atlas and the axis: Lateral atlanto-axial joints (x2) – formed by the articulation between the inferior facets of the lateral masses of C1 and the superior facets ...

Oct 30, 2023 · The atlanto-axial joints consist of three synovial joints, two lateral joints and one median joint. The two lateral atlanto-axial joints (right and left) are formed by articulations between the inferior facets of the lateral masses of C1 vertebra and …

Feb 12, 2025 · With several different structural features that contribute to its vital role in cervical stability and mobilization, the atlantoaxial joint is a special kind of joint. Two lateral atlantoaxial joints and one medial joint make up its three separate synovial joints.

What is Atlanto-Axial Instability (AAI), also known as Craniocervical Instability (CCI)? CCI stands for craniocervical instability and AAI means atlantoaxial instability. Before we get into what these terms mean, let’s review the anatomy of the craniocervical junction, or where the cervical spine meets the skull.

Oct 28, 2024 · The atlantoaxial joint is an important "transitional zone" in the cervical spine prone to instability by both degenerative and traumatic processes Pathophysiology

Jul 7, 2021 · Dr. Schultz explains what the Atlantoaxial Joint is and does, symptoms that it isn't working, how to treat this crucial upper cervical joint.

The atlanto-axial joint, consisting of the atlas (C1) and axis (C2), plays a vital role in enabling cervical spine rotation but lacks the bony stability found in the lower cervical vertebrae.

Dec 6, 2012 · When you nod your head as if to say "yes," that is neck flexion. The atlas and axis form the atlanto-axial joint, which allows head rotation. If you shake your head as if to say "no," that is head rotation. The atlanto-axial joint is a compound synovial joint.

The atlantoaxial joint is a complex joint between atlas (c1) and axis (C2) which helps with axial rotation allowing our head to turn left and right and is supported by a complex set of ligaments and muscles.

The atlanto-axial joint (Latin: articulatio atlanto-axialis) is a complex articulation formed between the first (atlas) and the second (axis) cervical vertebrae. It is composed of three synovial joints: one median atlanto-axial and two lateral atlanto-axial joints. The atlanto-axial joint is a part of a larger craniovertebral joint group.

Mar 31, 2023 · What is an atlantoaxial joint? The atlantoaxial joint is a synovial type of joint that is categorized as a biaxial, pivot joint. The joint locates in the upper part of the neck between the 1st and 2nd cervical vertebrae. It is also known as the atlas and axis.

The atlantoaxial joint is a pivot synovial joint between the atlas and axis vertebrae. The vertebrae communicate with each other at three separate synovial joints; two lateral plane synovial joints and one median pivot joint.

It is formed between the odontoid peg or dens of the axis bone and the ring of the atlas. However, various conditions such as trauma, arthritis, infection or congenital malformations could make the atlantoaxial joint unstable.

The C1 C2 spinal motion segment, also called the atlantoaxial joint, is located in the upper portion of the cervical spine. It consists of the C1 and C2 vertebrae, and the anatomical structures connecting them. This segment provides rotational motion, supports the head, and protects the spinal cord and nerve pathways.

5 days ago · As many as 1 in 150 people are estimated to have axial spondyloarthritis (axSpA) 1, an inflammatory form of arthritis that is associated with chronic lower back pain.Axial spondyloarthritis is an umbrella term for types of inflammatory arthritis that primarily affect the spine and the sacroiliac (SI) joints that connect the lower spine to the pelvis, resulting in pain …

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.

Apr 30, 2025 · Boundary and loading conditions. Assuming normal ambulation in the one-leg stance, hip joint reaction forces (2100 N, 300% of the body weight) were loaded onto the femoral head, and an abductor muscle force (700 N, 100% of the body weight) was applied to the lateral surface of the greater trochanter [37, 38].Each force was applied at an angle of 20° from the …