Objective To evaluate the efficacy of unilateral open door laminoplasty and individualized cervical pedicle screw fixation for multisegmental cervical spondylotic myelopathy with flexibility type kyphosis.Methods Twenty one cases of multisegmental cervical spondylotic myelopathy with flexibility type kyphosis received surgical treatment.Unilateral open door laminoplasty and individualized cervical pedicle screw fixation.The Japanese Orthopaedic Association ( JOA) scoring system and disability index ( NDI) were applied to evaluate the neurological function and axial neck /shoulder pain before and after surgery.The Borden′method was employed to measure the cervical curvature.CT plain scan of cervical pedicle and sagittal two-dimensional imaging of transpedicular on the axial was examined.The unilateral open door laminoplasty and individualized cervical pedicle screw fixation was performed .Results A total of 168 pedicle screws were fixed successfully in 21 patients, the accuracy of screw placement reached 93.5%.The cervical curvature measured by Borden′method showed significant differences before and after operation.Compare to those before surgery , the JOA scores at 1 week after operation and at final follow-up were decreased and NDI scores were significant increased ( P <0.05 ).Conclusion Unilateral open door laminoplasty and individualized cervical pedicle screw fixation is effective for treatment of multisegmental cervical spondylotic myelopathy with flexibility type kyphosis.

Objective To investigate the clinical effect of percutaneous kyphoplasty (PKP) in treatment of osteoporotic vertebral fractures and collapse with intravertebral vacuum sign.Methods A retrospective study was conducted on the clinical and radiological data of 31 patients with osteoporotic vertebral fractures and collapse with intravertebral vacuum sign treated by PKP from June 2009 to June 2011.Vertebrae body variation,visual analog scale (VAS) and Oswestry disability index (ODI) before operation,during follow-up at postoperative one week and at postoperative 3-6 months were used as outcome measurements.Results All the patients went through operations successfully and presented significant mitigation of low back pain in 24 hours after operation.The vertebrae body height at postoperative one week [(17.2 ±4.2) mm] and at postoperative 3-6 months [(16.8 ±5.1)mm] were statistically different from that before operation [(11.4 ± 1.7) mm,P ＜0.01],while there was no statistical difference between the two follow-ups (P ＞ 0.05).VAS and ODI at postoperative one week [(2.8 ± 1.7) points and (31.6 ± 8.4) points] were statistically different from those before operation [(8.6 ± 1.3) points and (78.3 ±8.5) points,P＜0.01].VAS and ODI at postoperative 3-6 months [(2.3 ±0.8) points and (23.7 ± 2.3) points] presented statistical differences from those before operation (P ＜ 0.01),but no statistical differences from those at postoperative one week (P ＞ 0.05).Conclusion PKP obtains satisfactory clinical outcomes,for it relieves low back pain and restores vertebral body height.

Objective To assess the efficacy of internal fixation assisted with Halo-vest in the treatment of Anderson-D'Alonzo type Ⅱ and superficial type Ⅲ odontoid fractures.Methods A retrospective case series study was made on 15 patients clinically diagnosed as Anderson-D'Alonzo type Ⅱ and type Ⅲ odontoid fractures with a fracture gap over 2 mm,displacement over 5 mm and broken end angel over 11° from January 2007 to January 2015.There were nine males and six females,aged 27-61 years [(44.5 ± 10.9)years].The patients were treated in "three phases" with the assistance of Halo-vest external fixation system and a novel guide pin aiming device.The three phases were as follows:phase Ⅰ:cervical traction reduction and halo-vest external fixation;phase Ⅱ:Halo-vest assisted internal fixation using the novel aiming device;phase Ⅲ:the Halo-vest fixation removal and cervical collar fixation.Operation duration,intraoperative bleeding,and postoperative visual analogue scale (VAS) pain score one month after the operation were recorded.The cervical lateral and open mouth X-ray or atlantoaxial CT scan with sagittal and coronal two-dimensional reconstruction were regularly reviewed,and the location of screws,reduction and fracture healing were evaluated.Results Operation duration ranged from 54 to 96 minutes [(71.3-± 11.9) min].The intraoperative blood loss was 5-60 ml [(32.6 ± 16.8) ml].There was no spinal cord or nerve root injury,cerebrospinal fluid leakage,wound infection or other complications.All patients were followed up for 12-36 months (mean,28 months).Fourteen patients were seen bony union 6 months after the surgery and one patient was seen a false joint.At the last follow-up,the patient with false joint was seen bone sclerosis,and other patients with sound bone healing.The preoperative VAS and that of one month after the operation was (7.3 ± 0.6) points and (1.6 ± 0.7) points,respectively (P ＜ 0.05).Conclusion For Anderson-D'Alonzo type Ⅱ and type Ⅲ odontoid fractures,which have a fracture gap greater than 2 mm,displacement more than 5 mm,broken end angle above 11 degrees,the three-phase Halo-vest assisted internal fixation can provide good stability before operation and promote bone healing and pain relief after operation.

Objective:To investigate the feasibility and clinical efficacy of posterior vertebral column resection (PVCR) combined with polymethylmethacrylate-augmented pedicle screw instrumentation and shortening of spinal column for stage Ⅲ Kümmell's disease with very severe collapse of fractured vertebra.Methods:From January 2017 to September 2021, 9 patients with stage Ⅲ Kümmell's disease with very severe collapse of fractured vertebra underwent PVCR combined with polymethylmethacrylate-augmented pedicle screw instrumentation and shortening of spinal column. Their medical records were retrospectively analyzed. There were 1 male and 8 females, aged (66.9±5.8) years. The injured vertebra was located at T 11 in 2 patients, at T 12 in 4, at L 1 in 2 and at L 2 in 1. X-ray, CT and MRI were performed before operation. The posterior intervertebral heights of adjacent vertebral bodies of the fractured vertebra in the median sagittal position were measured on CT or MRI to evaluate the shortening of the spinal column before PVCR. Recorded were intraoperative bleeding volume, operation time, complications, bone graft fusion, and American Spinal Injury Association (ASIA) grading at preoperation and the last follow-up. The visual analogue scale (VAS) pain scores, Oswestry disability index (ODI) scores, and kyphotic cobb angles at preoperation, 1 week and 3 months postoperation, and the last follow-up were compared to evaluate the clinical efficacy of PVCR. Results:All patients underwent surgery successfully, with tight closure of adjacent vertebrae after resection of the injured vertebra and bone grafting. Operation time was (240.6±23.2) min and intraoperative bleeding (505.6±95.0) mL. The 9 patients were followed up for (17.3±5.6) months. No worsening symptoms of nerve injury, cerebrospinal fluid leakage, or other serious complications were found after operation, nor such complications as loosening or breakage of internal fixation or adjacent vertebral fractures. Bone fusion was achieved at the bone graft sites in all patients by the last follow-up. The VAS and ODI scores and cobb angles at 1 week and 3 months postoperation and at the last follow-up were significantly decreased compared with preoperation ( P<0.05). There were no significant differences in VAS scores or cobb angles among postoperative 1 week and 3 months and the last follow-up ( P>0.05), but pairwise comparisons between different time points after operation showed significant differences in ODI, with postoperative 1 week > postoperative 3 months > the last follow-up ( P<0.05). The ASIA grading at the last follow-up was improved from preoperative grade C to grade D in 2 cases, from preoperative grade C to grade E in 1 case and from preoperative grade D to grade E in 5 cases. Conclusion:PVCR combined with polymethylmethacrylate-augmented pedicle screw instrumentation and shortening of spinal column is a feasible and effective surgical treatment for stage Ⅲ Kümmell's disease with very severe collapse of fractured vertebra, leading to good clinical efficacy.