Abstract: Objective　To observe the clinical effect of reconstruction of C2 muscle ligamentous complex with open-door laminoplasty for the treatment of OPLL  (ossification of posterior longitudinal ligament) involving C2.　Methods　From March 2016 to June 2018，a retrospective study was performed on 19 patients in our hospital who were treated with reconstruction of C2 muscle ligamentous complex with open-door laminoplasty for the treatment of OPLL involving C2. The JOA Score and VAS Score were used to assess clinical efficacy.　Results　All 19 cases were followed up for 3~31 months. Most of the patients with numbness, weakness of the limbs, walking instability symptoms had been well improved. Two patients had axial symptoms after operation, and one patient occurred C5 nerve root palsy. But the symptoms were relieved after symptomatic treatment. The preoperative JOA score was (8.26±1.63) points, (14.19±3.27) points at the postoperative follow-up. There was statistical difference in JOA score between preoperative and the final follow-up (P<0.05). The preoperative VAS score was (6.85±0.91) points, and (1.06±0.89) points at the postoperative follow-up.  There was statistical difference in VAS score between preoperative and the final follow-up (P<0.05). The efficacy was judged by JOA scoring criteria: excellent in 11 cases, good in 5 cases, and general in 3 cases. The postoperative neurological improvement rate was (78.96±12.83) % at the last follow-up.　Conclusions　Reconstruction of C2 muscle ligamentous complex with open-door laminoplasty for the treatment of OPLL involving C2 is less difficult to operate, with few complications, and significant short-term efficacy.

Key words: Ossification of posterior longitudinal ligament, 　Open-door laminoplasty, 　C2 muscle ligamentous complex