Fusion can provide stabilization foratlanto-axial joint, but it restricts the movement between atlas and axis andinduces degeneration and instablility of unfused cervical spine.

• 而融合术虽然能稳定寰枢关节，但又丧失了寰枢关节的运动功能，导致术后病人头颈活动特别是旋转明显受限，久之未融合的颈椎关节易继发退变和不稳。