Atlanto-occipital lateral displacement is a severe form of craniocervical injury in which the occipital condyles—the rounded protrusions at the base of the ...

An anterior dislocation of the atlanto-axial (C1–C2) joint occurs when the atlas (C1) shifts forward relative to the axis (C2), disrupting the normal alignment ...

The atlanto-axial joint lies between the first cervical vertebra (atlas) and the second cervical vertebra (axis). An atlanto-axial dislocation occurs when the ...

Atlanto-axial instability (AAI) refers to excessive movement between the first cervical vertebra (the atlas, C1) and the second cervical vertebra (the axis, ...

Degenerative instability of the atlanto-occipital (AO) joint refers to excessive movement at the junction between the skull’s occipital condyles and the first ...

Atlanto-occipital joint neoplastic instability refers to abnormal, excessive movement at the junction between the base of the skull (occiput) and the first ...

Atlanto-occipital joint inflammatory instability occurs when inflammation weakens or destroys the ligaments and joint surfaces between the atlas (C1) and the ...

Traumatic instability of the atlanto-occipital (C0–C1) joint occurs when high-energy forces disrupt the ligaments and bony articulations that normally secure ...

Congenital atlanto-occipital joint instability is a condition present at birth in which the joint connecting the skull (occiput) and the first neck vertebra ...

The atlanto-occipital joint is a condyloid synovial articulation between the occipital condyles at the base of the skull and the superior articular facets of ...

Atlanto-occipital lateral displacement is a severe form of craniocervical injury in which the occipital condyles—the rounded protrusions at the base of the ...

Posterior displacement of the atlanto-occipital (AO) joints—sometimes called a posterior atlanto-occipital dislocation—is a serious injury in which the skull ...

The atlanto-occipital (AO) joints are the paired synovial articulations between the occipital condyles of the skull and the superior facets of the first ...

Anterior atlanto-occipital displacement—often called anterior atlanto-occipital dislocation—is a severe instability at the craniocervical junction in which the ...

Atlanto-occipital joint dislocation (AOD), also called atlanto-occipital dissociation or internal decapitation, is a life-threatening injury in which the skull ...

Atlanto-occipital instability is a condition in which the joint between the base of the skull (the occiput) and the first cervical vertebra (the atlas) moves ...

Craniocervical joint vertical distortion is an injury in which the base of the skull (occiput) is pulled upward or “distracted” from the top vertebra (atlas, ...

Craniocervical joint posterior dislocation, a severe form of atlanto‑occipital dislocation, refers to the backward displacement of the skull base relative to ...

Craniocervical joint longitudinal distraction is a traumatic injury characterized by forcible separation of the skull base (occiput) from the first cervical ...

Craniocervical joint anterior dislocation, often termed anterior atlanto-occipital dislocation (AOD), is a severe injury of the upper cervical spine in which ...