Meniscoids are folds of synovial membrane that project into the articular cavities of zygapophyseal joints throughout the cervical spine.

Meniscoids were identified in 86% of the zygapophyseal joints; 50% contained both ventral and dorsal meniscoids, 7% contained a ventral meniscoid only and 29% contained a dorsal meniscoid only.

Meniscoids were classified as adipose (4%), fibrous (74%), or fibroadipose (22%) based upon histological composition.

It is suggested that meniscoids are responsible for spinal blockades and eventually for other vertebrogenous complaints coming from local inflammation of facet joints.