Self-made minimally invasive pelvic channel instrument for treatment of pelvic ring fracture-dislocation / 中华创伤骨科杂志

Objective To evaluate the clinical efficacy of our self-made minimally invasive pelvic channel instrument in the treatment of pelvic ring fracture-dislocation.Methods A retrospective study was conducted of the 35 patients who had been treated for pelvic ring fracture-dislocation from December 2015 to November 2017 and fully followed up at Department I of Orthopaedis,Beijing Chaoyang Emergency Rescue Center.They were 25 males and 10 females,aged from 20 to 73 years (average,41.3 years).According to the Tile classification for pelvic fractures,there were 26 cases of type B (type B1 in 8,type B2 in 12 and type B3 in 6) and 9 cases of type C(type C1 in 5,type C2 in 3 and type C3 in 1).Infix or anterior plate combined with percutaneous internal fixation with sacroiliac cannulated screws was used in 11 patients,sacroiliac triangle fixation combined with percutaneous internal fixation with anterior ring cannulated screws in 5 ones,and internal fixation with cannulated screws for anterior and posterior rings in 19 ones.All the channels were established using our self-made minimally invasive pelvic channel instrument for internal fixation with cannulated screws.The time for each screw placement and the number of X-ray projection were recorded.Postoperative reduction,pelvic function at the final follows-ups and complications were recorded.Results A total of 84 cannulated screws were inserted in the 35 patients.The time for each cannulated screw placement ranged from 5 to 13 minutes (average,8.1 minutes);the number of X-ray projection for each screw placement ranged from 7 to 15 times (average,10.3 times).Postoperative CT showed that all the cannulated screws were located in the preset channels.According to the Matta radiological criteria,postoperative reduction quality was excellent in 29,good in 4 and fair in 2,giving a good to excellent rate of 94.3％.The follow-up time for the 35 patients ranged from 6 to 15 months (average,12.3 months).At the final follow-ups,all the patients showed fine fracture union.There was no loosening or breakage of screws in all but one patient in whom one sacroiliac screw became loose 3 months after surgery.By the Majeed criteria,the pelvic function was excellent in 27 cases,good in 5,fair in 3 and poor in one,giving a good to excellent rate of 91.4％.Conclusion Our self-made minimally invasive pelvic channel instrument can be used to establish pelvic channels,leading to more accurate placement,shorter operative time and less X-ray projection.

Value of pelvic CT sagittal reconstruction for percutaneous insertion of iliosacral screws / 中华骨科杂志

Objective To investigate the value of pelvic CT sagittal reconstruction for percutaneous insertion of iliosacral screws.Methods Data of 32 patients who had been treated for pelvic posterior ring injury from June 2015 to March 2017 were retrospectively analyzed.There were 21 males and 7 females,aged from 21 to 75 years (average,43.2 years).According to Tile classification for pelvic fractures,there were 23 cases of type B (type BI in 4,type B2 in 13 and type B3 in 6),and 9 cases type C (type C1 in 6,type C2 in 2 and type C3 in 1).The pelvic CT three-dimensional reconstruction was performed before operation,and the reconstructed layer of CT sagittal position was overlapped,and preset S1,S2 sacroiliac joint hollow.Insert the screws according to the preset needle point and passage under the perspective of C-arm X-ray machine during the operation.In 32 cases of patients,3 cases of type C1,1 case of type C2 and 1 case of type C3 fractures in sacroiliac joint hollow combined with S1-ilium pedicle screw internal fixation,and the rest of 27 patients were treated by iliosacral screws.The time for each screw placement and the times of X-ray projection were recorded.The position of cannulated screw was observed by CT scan and compared with the preset channel after the operation.Postoperative reduction quality was assessed using Matta radiological criteria and Majeed criteria was used at the final follow-ups to evaluate the pelvic function.Results The operations time was ranged from 40 to 240 min (average,130 min);and the blood loss was ranged from 20 to 150 ml (average,80 ml).Altogether 58 iliosacral screws were inserted in 32 patients.The time for each screw placement was ranged from 5 to 15 min (average,9.5 min);and the number for each screw X-ray projection was ranged from 7 to 15 times (average,10.2 times).Postoperative CT scan and vascular ultrasound showed that all the iliosacral screws did not penetrate the cortical bone or damaged the vascular nerves,and the error of the preset channel was from 0 to 5 mm (average,2.2 mm).All fractures healed successfully,and the healing time was 12 to 18 weeks (average,14.2 weeks).According to Matta radiological criteria,reduction was excellent in 26,good in 3 and fair in 3,with an excellent to good rate of 90.6％ (29/32).The follow-up time for the 32 patients was ranged from 6 to 15 months (average,11.3 months).At the latest follow-ups,Xray and CT examination showed fine fracture union and no loosening or breakage of screws in all.By the Majeed criteria,the pelvic function was excellent in 21 cases,good in 8 cases,fair in 3 cases,with a good to excellent rate of 90.6％ (29/32).Conclusion Preoperative pelvic CT sagittal reconstruction for preset of iliosacral screw insertion point,angle and length can achieve more accurate placement,shorter operative time and less time of X-ray projections.

Minimally invasive fixation of sacroiliac triangle for vertically unstable pelvic posterior ring injury / 中华创伤骨科杂志

Objective To investigate the clinical results of minimally invasive fixation of the sacroiliac triangle for vertically unstable pelvic posterior ring injury. Methods A retrospective study was conducted of 20 patients who had been treated for vertically unstable pelvic posterior ring from January 2014 to August 2016. They were 12 males and 8 females, aged from 20 to 58 years ( average, 35 years ) . According to Tile classification for pelvic fractures, there were 4 cases of type C1. 1, 6 cases of type C1. 2, 7 cases of type C1. 3 and 3 cases of type C2. Their posterior rings were treated by fixation through posterior paraspinal approach with S1-iliac pedicle screws plus percutaneous sacroiliac screws, and their anterior rings by closed reduction and internal fixation with cannulated screws, Infix or plate following open reduction. The incision length, operation time and intraoperative blood loss were recorded. Postoperative reduction quality was assessed by Matta radio-logical criteria and pelvic function by Majeed criteria at the final follow-ups. Results Altogether 20 fixation systems of S1-iliac pedicle screws and 37 sacroiliac joint screws were inserted in this series. The length of incision ranged from 5. 5 to 7. 6 cm ( average, 6. 2 cm ) , the operation time from 89 to 130 minutes ( average, 98 minutes) and the intraoperative blood loss from 110 to 320 mL (average, 195 mL). According to Matta ra-diological criteria, reduction was excellent in 13, good in 5 and fair in 2 cases, with an excellent and good rate of 90％. The follow-up time for the 20 patients ranged from 6 to 15 months ( average, 9 months ) . The healing time ranged from 10 to 14 weeks ( average, 12. 5 weeks ) . At the final follow-ups, X-ray and CT three-dimensional reconstruction showed fine fracture union. By the Majeed criteria, the pelvic function was excellent in 11 cases, good in 5, fair in 3, and poor in one, with an excellent and good rate of 80％. No loosening, breakage or pull-out of pedicle screws or sacroiliac screws happened. Conclusion Minimally invasive fixation of the sacroiliac triangle for vertically unstable pelvic posterior ring injury can lead to precise placement, quick recovery, small incision and good functional outcome.