55% of<unk>  cases occur in cervical vertebrae, and 31% in lumbar. Spinal osteoarthritis is known as spondylosis. Pathology of the C1-C2 (atlantoaxial) joint, the most mobile of all vertebral segments, accounts for 4% of all spondylosis.<unk>  joints The<unk>  joints are formed by the superior and inferior processes of each vertebra. The first cervical vertebra has an inferior articulating surface but, as it does not restrict lateral or posterior translation, is not always considered a proper zygoma (zygoma is Greek for "yoke," i.e. something that restrains movement). In the lumbar spine,<unk> s provide about 20 percent of the twisting stability in the low back. Each<unk>  joint is positioned at each level of the spine to provide the needed support especially with rotation.<unk>  joints also prevent each vertebra from slipping over the one below. A small capsule surrounds each<unk>  joint providing a nourishing lubricant for the joint. Also, each joint has a rich supply of tiny nerve fibers that provide a painful stimulus when the joint is injured or irritated. Inflamed<unk> s can cause a powerful muscle spasm.
Facet syndrome
Back strain
Medial knee injuries
Milwaukee shoulder syndrome
Löfgren syndrome
Fibrous ankylosis
Heel pad syndrome
Failed back syndrome