Early clinical efficacy of modified expansive open-door laminoplasty using Twinfix anchor for the treatment of multi-segmental cervical spondylotic myelopathy

Objective To evaluate the early clinical efficacy of modified expansive open-door laminoplasty using Twinfix anchor for the treatment of multi-segmental cervical spondylotic myelopathy.Methods From March 2008 to March 2011,28 cases with multi-segment cervical spondylotic myelopathy People's Hospital of Meishan City were treated by modified expansive open-door laminoplasty using Twinfix anchor,and 31 cases were treated by traditional expansive open-door laminoplasty.They were analyzed retrospectively using the Japanese Orthopedic Association(JOA) scale,ranges of motions(ROM) of cervical vertebra and Axial symptoms(AS).Results These cases were followed up 12-36 months(average 24.3 in the modified group and 24.5 in the traditional group).The average preoperative JOA score of the modified group was(8.13±0.47) and postoperative JOA score was(15.09±0.053),with an average improvement of(6.95±0.68),while the average preoperative JOA score of the traditional was(8.09 ±0.53) and postoperative JOA score was(14.94±0.47),with an average improvement of(6.84 ±0.49)(P 0.05).The decrease of ROM between the preoperative and the postoperative in the modified group was(6.95 ±0.68) and in the traditional group was(8.67±2.39)(P 0.05).There were 8 cases with AS in the modified group and 20 in the traditional(P 0.05).Conclusion The modified expansive open-door laminoplasty using Twinfix anchor for the treatment of multi-segmental cervical spondylotic myelopathy that can keep the ROM greatly and reduce the incidence of postoperative AS effectively,is a simple and reliable,and the early clinical efficacy is satisfactory.