ObjectiveTo investigate the results of open reduction with internal fixation for high anterior column fracture of acetabulum with intact true pelvic brim.MethodsFrom January 2006 to January 2010,12 patients suffered high anterior column fracture of acetabulum without involvement of true pelvic brim were identified.There were 9 males and 3 females,with the average of 35.6 years(range,29-46).The injury was caused by crush in 7 cases,smash of heavy object in 3 cases,and fall-down from height in 2 cases.These fractures were classified into three types:isolated high anterior column fracture of acetabulum without involvement of true pelvic brim,high anterior column fracture of acetabulum without involvement of true pelvic brim with posterior wall fracture of acetabulum and commminuted high anterior column fracture of acetabulum without involvement of true pelvic brim according to present and unpresent of posterior wall fracture.Five cases suffered isolated fracture and 2 cases associated smaller and nondisplacement fracture fragment of posterior wall were reduced and fixed by buttress plate of iliac crest and lag screw of anterior border of ilium through an iliofemoral approach; 4 cases with displacement posterior wall fracture of acetabulum were reduced and reconstructed by buttress plate and lag screws of through combinations of anterior and posterior approaches.One case suffered comminuted fracture were reduced and reconstructed by plates and screws of through extended iliofemoral approach.ResultsThe mean follow-up time of all patients was 26.7 months (range,14-37months).The quality of reduction was grade as anatomical in 8 patients,imperfect in 3,poor in 1 by Matta's score system.The fracture union was uneventful.There was nonunion and loss of internal fixation.At the final follow-up,the mean score was 16.8 (range,11-18),7 cases were graded as excellent,4 good,1 fair,according to modified Merle d'Aubigne and Postel score system.Heterotopic ossification and traumatic osteoarthritis were recorded in 1 patient.ConclusionGood clinical results can be achieved by anatomical reduction and rigid fixation through optimal approach.

Objective To investigate the outcome of the urethral realignment simultaneous internal fixation in treatment of pelvic fracture associated with posterior urethral disruption. Methods The study included 33 patients with pelvic fracture associated with posterior urethral disruption treated simultaneously by urethral realignment and internal fixation from December 2003 to August 2009. According to AO classification, two patients were with type A2 fracture, six with type B1 ,seven with type B2,five with type B3 ,six with type C1 ,four with type C2 and three with type C3. All the patients were found with complete posterior urethral disruption. Primary urethral realignment combined with emergency open reduction and internal fixation of pelvic fracture were performed in 12 patients. Due to unstable condition, 21 patients underwent primary suprapubic cystostomy and external fixation, sequentially delayed urethral realignment and internal fixation.Results The mean follow-up time of all patients was 37 months ( range, 3-63 months). Of all the patients, 25 patients (76%) regained good without urethral dialation or needed only short term urethral dilatation, and eight patients (24%) suffered from urethral stricture and needed further complex surgery. The incidences of urinary incontinence and erectile dysfunction were 6%(2/33) and 18% (6/33). The erectile dysfunction of two patients was ascribed to sacral nerve injury.At the final follow-up, the mean score was 90.3 points (range, 66-100) according to the Majeed' s scoring system, which showed that the result was excellent in 24 patients, good in eight and fair in one.Conclusions Urethral realignment and simultaneous internal fixation can attain good clinical results for pelvic fracture associated with posterior urethral disruption. It takes advantages of minor surgical trauma,short treatment cycle, good outcome and low complication rate.

Objective To simulate the process of lag screw insertion on intact pelvises under guidance of conventional fluoroscopes or 2D and Iso-C3D computer-assisted navigations and evaluate the accuracy and practicability of the computer-assisted navigation. Methods Six dried intact adult pelvic specimens were selected and divided into three groups randomly. A total of 54 hollow screws were placed in bilateral pedicles of S1 and S2, anterior column of bilateral acetabulum, anterior column of bilateral acetabulum and pubic symphysis of intact adult dried pelvic specimens of three groups under guidance of conventional fluoroscopy, 2D and Iso-C3Dcomputer assisted navigations, respectively. The accuracy of the screw positions, the average operating time of each screw insertion and the average time of radiation exposure during the insertion of each screw were compared among three groups. Results There were significant differences in the accuracy of the screw positions, the average operating time and the average time of radiation exposure among three groups (P＜0.01). The navigation with Iso-C3D appeared to provide the highest accuracy and the shortest operating time of all guidance techniques. The mean operating time and the average time of radiation exposure of the conventional fluoroscope were the longest among three groups. The average time of radiation exposure of the 2D computer-assisted navigation was the shortest.Conclusions Iso-C3D computer-assisted navigation is the most accurate and expeditious means of all guidance techniques. The time of radiation exposure can be significantly reduced by both 2D and Iso-C3D computer-assisted navigations.

Objective To evaluate the result of percutaneous internal fixation in treatment of uncomminuted ankle fractures (inner malleolus,extemal malleolus and ventral condyle). Methods A total of 26 patients with uncomminuted ankle fractures at age range of 20-55 years(mean 35.2 years)were treated with closed reduction and percutaneous internal fixation by screws,eannulated screws or Kirschuer pins under C-arm X-ray scan.All patients were followed up for 12-24 months(mean 14 months).Results All fractures were healed successfully.with healing time of 8-24 weeks(mean 10.3 weeks).According to Bourne Standard,excellent ankle function results were reposed in 15 patients,good in 9 and fair in 2,with excellence rate of 92%.There was no implant failure,postoperative infection or dehiscence. Conclusions With advantage of early rehabilitation and minor incision of the affected ankles,closed reduction and percutaneous internal fixation can be selected for transverse or oblique uncomminuted ankle fractures,especially for those patients with severe swelling or skin injury.

Objective To investigate the early diagnosis and treatment of pelvic fracture with vaginal injury.Methods From January 2000 to July 2010,13 patients suffered from pelvic fracture with vaginal injury were treated in our hospital,whose average age was 31.7 years.According to the Tile classification,there were 4 cases of type B1,1 case of type B2,4 cases of type B3,3 cases of type C1,and 1 case of type C2.Emergency repair of vagina together with open reduction and internal fixation of pelvic fracture was performed in 3 patients.After the patients' condition became stable,5 patients with shock were treated with emergency repair of vagina together with primary external fixation of pelvic fracture.Prompt repair of vagina together with open reduction and internal fixation or primary external fixation of pelvic fracture was performed in 2 patients who underwent delayed diagnosis.Two cases of extensive pelvic abscess due to missed diagnosis of vaginal laceration were treated with debridement and external fixation of pelvic fracture,and reconstructions of vagina were performed after infection control.Results Twelve patients survived,and 1 patient died 6 h after admission.Eleven patients were followed up for 8 to 36 months (average,17 months).Among 9 patients who underwent one-stage repair of vagina,5 married patients had normal sexual life,1 suffered from pain during sexual intercourse,and 3 unmarried patients had normal menses.Two patients who underwent second-stage reconstruction of vagina suffered from pain during sexual intercourse.At final follow-up,the mean Majeed score was 82.2 (range,56 to 96),and the results were excellent in 6 cases,good in 3 cases,fair in 2 cases.Conclusion Vaginal injury should be highly suspected in females with anterior pelvic ring fracture.Early diagnosis and repair of vaginal injury is crucial to good clinical outcomes.Delayed diagnosis and treatment may lead to severe complications.

OBJECTIVE To study the resistance of Acinetobacter baumannii in our hospital and the relation with ADC ?-lactmases.METHODS Antibiotic susceptibility testing was determined by K-B methods to 115 A.baumannii strains,and three dimensional extract testing was performed to detect the ADC ?-lactmases-producing strains,blaADC gene was detected by PCR methods,and the MIC of ceftazidime,et al were determined in the presence of cloxacillin(500 mg/L) in 30 A.baumannii strains detected.RESULTS The resistance to imipenem and cefoperazone/sulbactam was below 10.4%,to other antibiotic resistance was over 54%;the multiresistance strains were 59%.ADC ?-lactmases and blaADC genes were all positive and the MIC of ceftazidime,et al except cefepime was decreased over eight-fold in the presence of cloxacillin for multiresistant A.baumannii,but not for non-multiresistant A.baumannii.CONCLUSIONS The resistance of A.baumannii is very serious in our hospital,ADC ?-lactmases-producing strains are related markedly with the multiresistance of A.baumannii.

Objective:to investigate the clinical feature and dynamic changes of the cervical dural sac and spinal cord during neck flexion in Hirayama disease(juvenile muscular atrophy of distal upper extremity).Methods:Clinical data were taken and MRI in neutral neck position and a fully flexed neck position were performed on 27 cases of Hirayama disease.Results:(1)All patients were consistent with the diagnostic criteria of Hirayama disease who had asymmetric muscular atrophy and weakness of the hand and forearm.All patients were young males and right handed of whom 77.8% had initial symptoms before they were 19 years old.More patients(20 cases,74%)had muscular atrophy in the right hand than in the left at onset.The duration after disease onset was from 2-72 months[(26.48?15.57)months].(2)In neutral neck position by MIR examination,16 patients showed abnormal cervical curvature,14 showed atrophy of the lower cervical cord and 2 patients had intramedullary abnormal high signal.(3)In a fully flexed position of the neck,all patients showed forward displacement and flattening of the lower cervical cord,and a crescent-shaped high signal area behind the cord.(4)The crescent-shaped area was enhanced on T1-weighed imaging and disappeared after the patient returned to a neural position in one case.Conclusion:Hirayama disease occurs mainly in young males.There are obviously dynamic changes of the cervical cord during neck flexion in Hirayama disease by MRI examination,which can help the doctor make diagnosis in the early stage.

ObjectiveTo investigate fecal diversion in the management of pelvic fractures associated with perineal injuries.MethodsThis retrospective study involved 27 patients of pelvic fractures associated with perineal injuries during April 2005 to April 2011.There were 23 males and 4 females,and the mean age was 32.9 years old (range,16-62 years old).Fractures type according to Tile classification:4 cases were type A,10 cases were type B,and 13 cases were type C.The pelvic external fixator and fecal diversion were selectively used.Results Of the 27 patients of pelvic fractures associated with perineal injuries,24survived.The overall mortality of pelvic fractures associated with perineal injuries in the present study was 11％.The survived 24 patients were totally reviewed clinically.The mean follow-up time of these patients was 10.9 months (range,4-42 months).Of those patients who underwent early fecal diversion (＜ 48 h),none experienced infectious completions.However,of those underwent non-early (＞48 h) fecal diversion (including those who did not undergo fecal diversion),four patients experienced infectious completions.Fisher's exact test was used to compare the infection rate of these two groups.And the result of Fisher's exact test demonstrated that those patients who underwent early (＜ 48 h) fecal diversion and non-early (＞48 h) fecal diversion (including those who did not undergo fecal diversion).ConclusionStabilization of hemodynamic; selective fecal diversion; early stabilization of pelvic fracture are necessary for the emergency management of pelvic fractures associated with perineal injuries.Rectal injury and severe perineal injury without involvement of rectum should undergo fecal diversion.Early fecal diversion (＜ 48 h) could reduce the infection rate of pelvic fractures associated with perineal injuries.

Objective To explore the significance of motor unit number estimation (MUNE) by using multiple point stimulating technique to evaluate patients with Hirayama disease (HD).Methods Multiple point stimulating technique was used to estimate the motor unit number of abductor pollicis brevis and abductor digiti minimi in 35 normal subjects [14-33 years old,mean (20.9 ±4.0) years old,33 men and 2 women]without nerve and muscle disease and 69 patients definitely diagnosed as HD [16-35 years old,mean (21.46 ±6.61 ) years old,67 men and 2 women].The differences between the two groups were examined by Fisher's exact test and t test.Results There were 42 patients with atrophy and 27 patients with normal clinical manifestation of left hand.For right hand there were 54 patients with atrophy and 15 normal.For controls,the MUNE value of left abductor pollicis brevis was 226.97 ± 30.59,while that of right side was 22g.31 ± 25.35.The MUNE value of left abductor digiti minimi was 237.43 ± 30.78,while that of right side was 240.20 ± 37.73.For HD patients,the MUNE of left abductor pollicis brevis and abductor digiti minimi was 145.66 ± 126.10 ( t =5.07,P ＜ 0.01 ) and 102.20 ± 112.67 ( t =9.31,P ＜ 0.01 )respectively,while those of right hand was 149.72 ± 117.80 ( t =5.31,P ＜ 0.01 ) and 64.23 ± 69.27 ( t =16.76,P ＜0.01 ) respectively.MUNE of left abductor digiti minimi in 17 patients that was below 200 among 27 patients with normal clinical manifestation (x2 =9.57,P =0.002).MUNE of right abductor digiti minimi in 12 patients that was below 200 among 15 patients with normal clinical manifestation ( x2 =4.64,P =0.03).Conclusions The differences of MUNE values by multiple point stimulating technique between the normal subjects and the HD patients is significant,which suggests this method is very useful to evaluate HD in the early state.