discovertebral啥意思？

After the joints of the hands and feet, the cervical spine is the most common region involved in RA and is the most common inflammatory arthritis affecting the cervical spine [4, 5].Although any region of the cervical spine can be involved in RA, the occipitoatlantoaxial junction is most often affected due to the predominantly synovial characteristics of the joint [6]. Atlantoaxial subluxation may occur in up to 49% of patients with RA and is the most common cervical lesion in patients with RA [5]. Pannus, inflammatory granulation tissue that forms over synovial cells in RA, may form in the odontoid region of the atlantoaxial joint, in some instances resulting in spinal cord compression over time [5]. Subaxial cervical involvement can occur late in the disease course, characterized by destruction and erosion of cervical zygapophyseal joints, interspinous ligament, and the discovertebral junction at multiple levels leading to anterior subluxation. Severe subaxial cervical subluxation can cause cervical spine instability and neurologic impairment from compression of the spinal cord, nerve roots, or vertebral arteries [5].

除手、足的小关节外，颈椎是类风湿性关节炎最常累及的部位，也是颈椎最常见的炎性关节炎^[4-5]。虽然类风湿性关节炎可累及颈椎的任何部位，但寰枢关节因有丰富的滑膜组织而更易受累^[6]。高达49%的类风湿性关节炎患者会发生寰枢椎半脱位，是类风湿性关节炎患者最常见的颈椎病变^[5]。类风湿性关节炎患者可能在寰枢关节齿状区形成血管翳（炎性肉芽组织），随着疾病的进展，某些情况下可能压迫脊髓^[5]。病程后期可能有下段颈椎受累，关节突关节、棘突间韧带及多个层面的椎间盘受到破坏和侵蚀，将导致颈椎向前半脱位。重度的下颈椎半脱位可导致颈椎失稳并可因脊髓、神经根或椎动脉受压导致神经功能障碍^[5]。