[Objective]The purpose of this study was to determine the treatment odontoid fractures complicated by significant C2、3 displacement.[Method]Sixteen patients with odontoid fractures(12 type Ⅱ and 4 type Ⅲ,according to Anderson-D'Alonzo standard)were treated in this study.There were 11 male and 5 female with an average of 36 years(range 19-54 years).Group A included 9 cases of odontoid fracture with Hangman fracture and group B includcd 7 cases of odontoid fractures with C2、3 anterior fusion and 6 underwent dens screw with C2、3 posterior fusion.Postoperatively,neck collars were applied for 3 months.[Result]Successfully closed reduction of C1～2 was achieved in 16 patients.No complication occurred in the two groups.[Conclusion]Postoperatively there was no motion restriction in the neck or residual neck pain.Direct osteosynthesis of the fractured dens with screws is an effective procedure for unstable type Ⅱ fracture of the dens.Postoperative external immobilization with a neck collar seems to contribute much to the treatment.

Objective To observe the efficacy of extensive decompression through transforaminal lumbar interbody fusion (TLIF) pathway combined with pedicle screw fixation on treating degenerative lumbar stenosis in the dderly.Methods Seventy-five elderly patients (28 males and 47 females) with degenerative lumbar stenosis were treated with extensive decompression through transforaminal pathway at our hospital from Jan.2007 to Aug.2010.The operation is through the TLIF pathway to resect part of the articular facet,and expose unilaterally the intervertebral vertebral foramen.Decompression of the vertebral canal was conducted by removing the disc.In the end,we performed posterolateral fixation with pedicle screw and placement of bone graft in posterolateral part of the lumbar or did the interbody fusion.JOA scores were obtained before and 1 day after operation and in 3 month follow-up consultation.The intervertebral height and bone fusion were observed by X ray.Results The follow-up period of the 75 patients was 6-36 months with an average of 12 months.There was significant difference (t =20.79,P ＜ 0.05 ;t =25.89,P ＜ 20.05) in JOA score between 3 month follow-up (21.08 ± 3.60) and preoperation (10.91 ± 2.23),between 1 d follow-up (22.72 ± 3.26) and preoperation (10.91 ±2.23),respectively.The rate of improvement was (88.6 ± 10.8)％,with 98％ of excellent or good in 3-month follow-up.Lumbar plane films showed neither instability or internal fixation loosening,breakage or distortion in follow-up consultation.There were 2 cases in whom Cage dislocation occurred without any neurological symptoms.Conclusion Extensive decompression through TLIF pathway combined with pedicle screw fixation is an efficacious method of treating degenerative lumbar stenosis in elderly patients.This method can retain the structure of lumbar posterior complex,reduce the risk of low back pain.It is a safe choice for treatment of degenerative lumbar stenosis in the elderly.

Objective To study the clinical and radiographic characteristics of complicated axis fractures combined with adjacent segment instability and explore reasonable surgical treatment strategy. Methods A retrospective study was performed on 21 patients with axis fractures treated from August 2003 to June 2009. There were 14 males and 7 females at mean age of 34 years. The treatment strategy was based on the fracture type and the stabilities of adjacent atlantoaxial joint and intervertebral C2/3.Treatment strategies included anterior C2/3 interbody discectomy and fusion, anterior cervical plate internal fixation, odontoid screw fixation, posterior C1-2 pedicle screw fixation, cervical lateral mass screw fixation or combined anteroposterior approach. Results All patients were immobilized in a hard collar for thee months and followed up for 6-36 months (average 12 months), which showed bony fusion and cervical stability, with no intraoperative surgery-related complications such as loosening, extrusion or breakage of fixation, vertebral artery injury, nerve damage, cerebrospinal fluid leakage or wound infection. Neurological recovery was observed in five patients. Conclusions For complicated atlas fractures, correct identification of fracture type and instability disturbance of adjacent atlantoaxial joint and C2/3 as well as active treatment can conduce to better effect.

Objective To observe the clinical effect of percutaneous vertebroplasty f PVP)and percutaneous kyphoplasty(PKP)in the treatment of ostcoporotic vertebral compressive fracture. Methods Forty-two patients with osteoporotic vertebral compressive fractures were treated with PVP or PKP from August 2007 to July 2009.VAS and SF-36 scoring systems were employed to evaluate the Dain and quality of life.X-ray was used to evaluate the vertehral height restoration rate and the kyphosis correction rate.The bone cement leakage was determined based on the Chest X-ray. Results There was staitistical difference on PMMA leakage between PVP and PKP group.VAS and SF-36 scores at 2 wePks and 6months after operation were much better than those counted before operation in both PVP and PKP groups(P<0.05).The VAS and SF-36 scores at 6 months after operation showed no statistical difference in comparison with those before operation between PVP and PKP groups(P>0.05).At tWO weeks after operation,the height restoration rate of the fractured vertebral body(anterior and central column)in the PKP group waa better than that in the PVP group(P<0.05).The kyphotic correction rate in the PKP group was a little better than that in the PVP group(P>0.05).Conclusions In the treatment of osteoporotic vertebral compressive fracture,PVP and PKP have the similar effect on the pain relief,can refresh the height of the fractured vertebral body and correct the kyphotic angel of the fracture level to some extent.PVP has more PMMA leakage than PKP.