Abstract: Objective  To investigate the clinical efficacy of anterior cervical fusion and non-fusion surgery(Hybrid surgery，HS) in the treatment of cervical spondylosis with jumping responsibility segment.
Methods  From January 2015 to December 2018,6 cases with cervical spondylosis in jumping responsibility segment were treated with HS.Neck Disability Index(NDI) was used to evaluate daily activities of the patients and Neurological status was evaluated according to Japanese Orthopedic Association(JOA).The visual analog scale(VAS)was used to assess the neck pain intensity.All the changes of NDI,JOA and VAS scores of cervical spine before and during the last follow-up were evaluated,and the clinical effect was also evaluated according to Odom criteria.Finally,radiological analysis was conducted via lateral radiographs in flexion,extension and neutral position.The angular range of motion(ROM) of C2-C7,the ROM of non-fused segments,and cervical lordosis were measured by the Cobb method.
Results  No patient was performed unplanned reoperation during the following period,and the loosening of internal plant,formation of prosthetic joint and the fusion phenomenon in non-fusion segmental were not found in the last follow-up.JOA,VAS and NDI scores of cervical spine were improved compared with those before operation(P<0.05).Odom classification:excellent in 2 cases,good in 3 cases,fair in 1 case,the excellent and good rate was 83.3%.There was no difference between C2-C7 ROM and the ROM of non-fused segments before and after operation(P=0.06;P=0.07).C2-C7 cervical lordosis was detected to improve significantly as compared to the preoperative(P<0.05).
Conclusion  HS is safe and effective in the treatment of cervical spondylosis with jumping responsibility segment,and additional keepingROM of cervical spine in a certain extent.

Key words: cervical spondylosis, jumping segment, Hybrid surgery, clinical efficacy