Atlantoaxial instability is a common asymptomatic finding in<unk>  arthritis patients. However, it can lead to cervical myelopathy. Patients with atlantoaxial instability can experience neck pain and headaches in the back of the head (occipital headaches). Myelopathic symptoms include: weakness, gait disturbance, paresthesias, and loss of dexterity (e.g. difficulty buttoning clothing).
Rheumatoid disease of the spine
Spondylolysis
Spondylosis deformans
Neuropathic arthropathy
Axial spondyloarthritis
Ankylosing spondylitis
Spinal disc herniation
Vertebral osteomyelitis