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Purpose:Cervical disc arthroplasty(CDA)was developed to treat cervical degenerated disc diseases with the advantages of preserving the kinematics of the functional spinal unit.However,the safety and reliability of multi-level CDA are still controverted when comparing to the single-level CDA.It has shown unclear benefits in terms of clinical results,functional recovery,heterotopic ossification,and the need for secondary surgical procedures.The purpose of this study is to estimate the effectiveness of multilevel cervical arthroplasty over single-level CDA for the treatment of cervical spondylosis and disc diseases.