Accuracy of sacroiliac screw placement in robot-assisted navigation / 中国组织工程研究

BACKGROUND:Orthopedic robots have been widely used in clinical practice,and relevant reports have shown that they have many advantages such as minimal trauma and short surgical time.However,there is currently no clear report on how accurate they are. OBJECTIVE:To evaluate the accuracy of robot-assisted sacroiliac screw insertion. METHODS:A total of 131 patients with sacroiliac joint fracture and dislocation and sacral fracture admitted to the Department of Trauma Surgery,Gansu Provincial Hospital from January 2020 to April 2023 were retrospectively collected,including 131 S1 screws and 46 S2 screws,totaling 177 screws.They were divided into two groups based on whether robot-assisted navigation was performed.There were 63 cases of sacroiliac screws inserted under robot-assisted navigation(observation group),with 36 males and 27 females,aged 19-72 years,with a mean age of(45.3±17.6)years.Among them,39 cases were fixed with only S1 screws,while 24 cases were fixed with S1S2 screws,resulting in a total of 87 sacroiliac screws.Under C-arm fluoroscopy,68 cases of sacroiliac screws were inserted with bare hands(control group),including 41 males and 27 females,aged 23-67 years,with a mean age of(42.6±21.3)years.Among them,46 cases were fixed with simple S1 screws,while 22 cases were fixed with S1S2 screws,resulting in a total of 90 sacroiliac screws.A postoperative CT scan was performed to evaluate the number of S1 screws,S2 screws,total screw level,and calculate accuracy based on the method introduced by SMITH et al. RESULTS AND CONCLUSION:(1)In the observation group,62 S1 screws were accurately placed(62/63),with an accuracy rate of 98%.24 S2 screws were accurately placed(24/24),with an accuracy rate of 100%.The total number of screws accurately placed was 86(86/87),with an accuracy rate of 99%.(2)In the control group,58 S1 screws were accurately inserted(58/68),with an accuracy rate of 85%.19 S2 screws were accurately inserted(19/22),with an accuracy rate of 86%.The total number of screws accurately inserted was 77(77/90),with an accuracy rate of 86%.(3)There was a statistically significant difference in the accuracy of the S1 screw,S2 screw,and total screw between the two groups(P<0.05).It is suggested that the placement of sacroiliac screws under robot navigation has higher accuracy compared to manual placement under C-arm fluoroscopy,but still has a lower error rate in placement.

O-arm navigation versus C-arm navigation for guiding percutaneous long sacroiliac screws placement in treatment of Denis type Ⅱ sacral fractures / 中国修复重建外科杂志

OBJECTIVE@#To compare the effectiveness of O-arm navigation and C-arm navigation for guiding percutaneous long sacroiliac screws in treatment of Denis type Ⅱ sacral fractures.@*METHODS@#A retrospective study was conducted on clinical data of the 46 patients with Denis type Ⅱ sacral fractures between April 2021 and October 2022. Among them, 19 patients underwent O-arm navigation assisted percutaneous long sacroiliac screw fixation (O-arm navigation group), and 27 patients underwent C-arm navigation assisted percutaneous long sacroiliac screw fixation (C-arm navigation group). There was no significant difference in gender, age, causes of injuries, Tile classification of pelvic fractures, combined injury, the interval from injury to operation between the two groups ( P>0.05). The intraoperative preparation time, the placement time of each screw, the fluoroscopy time of each screw during placement, screw position accuracy, the quality of fracture reduction, and fracture healing time were recorded and compared, postoperative complications were observed. Pelvic function was evaluated by Majeed score at last follow-up.@*RESULTS@#All operations were completed successfully, and all incisions healed by first intention. Compared to the C-arm navigation group, the O-arm navigation group had shorter intraoperative preparation time, placement time of each screw, and fluoroscopy time, with significant differences ( P<0.05). There was no significant difference in screw position accuracy and the quality of fracture reduction ( P>0.05). There was no nerve or vascular injury during screw placed in the two groups. All patients in both groups were followed up, with the follow-up time of 6-21 months (mean, 12.0 months). Imaging re-examination showed that both groups achieved bony healing, and there was no significant difference in fracture healing time between the two groups ( P>0.05). During follow-up, there was no postoperative complications, such as screw loosening and breaking or loss of fracture reduction. At last follow-up, there was no significant difference in pelvic function between the two groups ( P>0.05).@*CONCLUSION@#Compared with the C-arm navigation, the O-arm navigation assisted percutaneous long sacroiliac screws for the treatment of Denis typeⅡsacral fractures can significantly shorten the intraoperative preparation time, screw placement time, and fluoroscopy time, improve the accuracy of screw placement, and obtain clearer navigation images.

Spino-Pelvic Fixation in Unstable Sacral Fracture: A Case Report

A 22-year-old female patient visited the emergency room (ER) after a pedestrian traffic accident in a drunken state. An examination at the ER revealed fractures at the right side of the sacral ala, sacral foramina, left anterior acetabulum, right inferior ramus, and right superior articular process of S1. She underwent spino-pelvic fixation and iliosacral (IS) screw fixation. One year later, bone union was completed and implant removal was performed and the treatment was completed without complications. The authors recommend spino-pelvic fixation and IS screw fixation for unstable sacral fractures as one of the excellent methods for obtaining posterior stability of the pelvis among the various treatments of unstable sacral fractures.

Pelvic Insufficiency Fracture in Severe Osteoporosis Patient / 대한고관절학회지

PURPOSE: To evaluate clinical features and the effect of parathyroid hormone (PTH) on treatment outcomes of patients with pelvic insufficiency fractures. MATERIALS AND METHODS: Fifteen patients diagnosed with pelvic insufficiency fractures were evaluated retrospectively. All patients had osteoporosis with mean lumbar T score of −3.9 (range, −3.1 to −6.4) and the mean age was 76.5 years. In all cases, simple radiography and computed tomography was used for final diagnosis; additional magnetic resonance imaging and technetium bone scans were used to confirm the diagnosis in 2 and 6 patients, respectively. Initial conservative treatment was used in all cases; treatment with PTH was applied in 5 cases. Radiological follow-up was done every 4 weeks up to 6 months and every 3 months thereafter. Symptom improvement was measured using visual analogue scale (VAS) score. RESULTS: Fractures were located: i) sacrum and pubis (9 cases), ii) isolated sacrum (4 cases) and iii) isolated pubis (2 cases). One case showed fracture displacement and pain aggravation at 4 week follow-up which was treated with percutaneous sacro-iliac fixation using cannulated screws. Duration of bone union was significantly shorter in the patients who used PTH (P<0.05). VAS scores were also lower in the group treated with PTH; however, statistical significance was not reached. CONCLUSION: In patients with osteoporosis, a pelvic insufficiency fracture should be considered if pain is experienced in the pelvic area in the absence of major trauma. While nonoperatic has been shown to be sufficient for treatment, our study shows that PTH therapy shortens treatment period and could be a favorable treatment option.

Lumbopelvic Fixation with Iliac Screw in Spinopelvic Dissociation / 대한정형외과학회잡지

PURPOSE: Spinopelvic dissociation which occurs by high energy trauma with associated fractures is rare. Treatment is difficult and only a few studies on treatment of spinopelvic dissociation have been reported. Therefore we evaluated spinopelvic dissociation patients treated with iliac screw. MATERIALS AND METHODS: We analyzed patients who underwent surgery using an iliac screw from 2005 to 2010. Preoperative radiologic classification was performed using the level of the transverse fracture line of the sacrum, shape of the fracture, and Roy-Camille classification. Neurologic evaluation was performed using Gibbons classification. Eleven patients underwent surgery with a pedicle screw in 1 level (L5 to S1) and bilateral iliac screws were added. RESULTS: A total of 11 patients were included in this study. The level of the transverse fracture line of the sacrum was mainly at S2, and there were mostly type 3 or 4 in Roy-Camille classification. Bony union was checked in 11 patients without metal failure. Six of 7 patients were treated by posterior decompression. Among them, 5 patients recovered from neurological deficit and 1 patient still had a sensory disorder on both lower legs. CONCLUSION: The more displacement of fracture, the more neurologic deficit occurred. In addition, we think that aggressive surgical treatment for spinopelvic dissociation should be considered, because a good clinical result was achieved with 1 level (L5 to S1) fixation and bilateral iliac screw fixation.

A Case of Surgically Treated by Transperitoneal Approach in Delayed Neurological Deficit after Sacral Fracture: A Case Report

This study reviews a case of sacral fracture with delayed onset neurological deficit that showed good results after decompressive surgery. The delayed neurological deficit appeared at 4 weeks after injury and it was treated with anterior decompression through transperitoneal approach. A 23-year-old woman was injured in a car accident and had bilateral pubic rami fractures and fractures of the sacral ala on the right side. She was treated with external fixation devices for approximately four weeks, but complained of pain and numbness. The dorsiflexion and plantalflexion of the right ankle was weakened and graded as grade 2. Preoperative pelvic and sacral radiographs, computed tomography, magnetic resonance imaging and electromyelography, and nerve conduction study were performed to identify the region of neurological deficit, and we decided to implement neurological decompression. By transperitoneal approach, we performed bone curratage and decompression around the region of sacral alar slope and S1 foramen. The pain and numbness of the right foot cleared up. Dorsiflexion and plantalflexion of the right ankle improved to grade 5. Anterior decompression by transperitoneal approach proved to bring satisfactory results in a patient, who presented delayed neurological deficit after sacral fracture.

Lumbopelvic reconstruction for treatment of unstable sacral fractures / 中华创伤杂志

Objective To evaluate the clinical outcome of lumbopelvic reconstruction in treatment of unstable sacral fractures.Methods A retrospective study was performed on 17 cases (12 males and 5 females； at 23-55 years of age,mean 35.5 years) of unstable sacral fractures treated from January 2007 to June 2012.There were 11 cases of zone Ⅱ fracture and six zone Ⅲ fracture according to Denis classification and nine cases of type B fracture and eight type C fracture according to Tile classification.Sacral nerve injury assessed by Gibbons criteria was 3 points in seven cases and 4 points in 10 cases.Lumbar-pelvic ring stability of the patients was restored by posterior decompression and lumbar pedicle screw fixation combined with sacral pedicle screw or iliac screw fixation.Fracture reduction and healing were measured by X-ray film or CT scan； functional outcomes by Majeed scale； neurological outcome by Gibbons criteria.Results All the cases were followed up for mean 16 months (range,8-24 months).X-ray and CT follow-up revealed all fractures had bone union at average 6 months in the absence of remnant sacrum malformation,pseudarthrosis and fracture redisplacement.Iliac screw loosening not yet breakage happened to one case.In total,12 cases had full recovery of neurological function； four significant improvement,but experienced different degree of footdrop and hypoesthesia of lower extremities； one poor improvement and experienced not only lower extremity dysfunction but also bladder and bowel dysfunction.According to Majeed scale in the final follow-up,clinical functional outcome was excellent in 12 cases,good in three,fair in one and poor in one,with excellent-good rate of 88％.Gibbons score improved from preoperative (3.29 ±0.47) points to postoperative (1.53±0.94) points (t=12.94,P＜0.01).Conclusion Posterior decompression plus lumbar pedicle screw fixation combined with sacral pedicle screw and/or iliac screw fixation is an effective method for treatment of unstable sacral fracture,for it can restore general stability of spine-pelvis,facilitate neurological function recovery and allow early weight-bearing.

Treatment of Unstable Sacral Fractures Related to Spino-Pelvic Dissociations

PURPOSE: To evaluate the outcomes of surgical treatment modality in unstable sacral fractures combined with spinal and pelvic ring injury depending on the presence of spino-pelvic dissociations. MATERIALS AND METHODS: The subjects were 16 patients, with unstable sacral fractures combined with spinal and pelvic ring injuries, were operated from July 2004 to January 2011. The patients were divided into 2 groups depending on the presence of spino-pelvic dissociations: those with dissociations were group 1, and those without dissociations were group 2. Group 1 was treated with spino-pelvic fixations using iliac screw, while group 2 was treated with percutaneous iliosacral screw fixations. The availability of the radiological bony union with its application periods, and clinical results using visual analogue scale (VAS) and oswestry disability index (ODI) were evaluated, retrospectively. RESULTS: Out of 16 patients, 8 patients in group 1 were treated with spino-pelvic fixation using iliac screw, and 8 patients in group 2 were treated with percutaneous iliosacral screw fixation. The mean bony union period was 17.4 weeks in group 1, and 19.6 weeks in group 2. The Mean VAS and ODI scores on the last follow-up were 2.5 points and 15.6 points in group 1, 2 points and 18.8 points in group 2, respectively. Both groups had favorable clinical results at the last follow-up. CONCLUSION: For surgical treatments of unstable sacral fractures, spino-pelvic fixation using iliac screws is advised for cases with combined spino-pelvic dissociation, while percutaneous iliosacral screw fixation is advised for cases without combined dissociation.

Transverse Sacral Fracture-Dislocation with Anterior Displacement: A Case Report

Transverse sacral fracture is a very rare injury and frequently missed or delayed in diagnosis. We present a case with this injury and discuss its management.

The Treatment of Transverse Fracture of The Upper Sacrum According to Roy-Camille Classification (Suicidal Jumper's Fracture): 4 Cases Report

STUDY DESIGN: A Case report. OBJECTIVES: We report 4 cases of transverse fracture of upper sacrum with good clinical results. SUMMARY OF LITERATURE REVIEW: There is no clear guideline for the treatment of transverse fracture of upper sacrum. MATERIALS AND METHODS: Four patients, who visited our institute for transverse fracture of upper sacrum, were reviewed from January 2006 to July 2009. RESULTS: All patients had good clinical results after treatment. CONCLUSIONS: In all cases, patients were managed conservatively without reduction or internal fixation. Only for Roy-Camille type 2 and 3 transverse fracture of the upper sacrum with neurologic deficit, decompression was performed, yielding good clinical results.

Lumbopelvic fixation and sacral decompression for a U-shaped sacral fracture: case report

BACKGROUND: U-shaped sacral fractures are highly unstable, can cause significant neurological deficits, lead to progressive deformity and chronic pain if not treated appropriately. OBJECTIVE: To report a case of a U-shaped sacral fracture treated with lumbopelvic fixation and decompression of sacral roots in a 23-years-old man. METHOD: Decompression of the sacral roots combined with internal reduction and lumbopelvic fixation using iliac screws. RESULTS: Restitution of lumbosacropelvic stability and recovery of sphincter function. CONCLUSION: Lumbopelvic fixation is effective in restoring lumbosacralpelvic stability and allows full mobilization in the postoperative period. Good neurological recovery can be expected in the absence of discontinuity of the sacral roots.

INTRODUÇÃO: As fraturas sacrais em U são instáveis e podem causar significativa lesão neurológica, deformidade progressiva e dor crônica se não tratadas apropriadamente. OBJETIVO: Relatar caso de um homem de 23 anos com fratura em U do sacro tratada com fixação lombopélvica e descompressão das raízes sacrais. MÉTODO: Descompressão da cauda equina associada a redução interna e fixação lombopélvica usando parafusos ilíacos. RESULTADOS: Reconstituição da estabilidade lombosacropélvica e recuperação da continência esfincteriana CONCLUSÃO: A fixação lombopélvica é eficaz em restaurar a estabilidade lombo-sacro-pélvica e permite mobilização imediata no pós-operatório. Recuperação neurológica pode ser esperada na ausência de neurotmese das raízes sacrais.

Lumbo-sacro-pelvic Fixation Using Iliac Screws for the Complex Lumbo-sacral Fractures

Fractures of lumbo-sacral junction involving bilateral sacral wings are rare. Posterior lumbo-sacral fixation does not always provide with sufficient stability in such cases. Various augmentation techniques including divergent sacral ala screws, S2 pedicle screws and Galveston rods have been reported to improve lumbo-sacral stabilization. Galveston technique using iliac bones would be the best surgical approach especially in patients with bilateral comminuted sacral fractures. However, original Galveston surgery is technically demanding and bending rods into the appropriate alignment is time consuming. We present a patient with unstable lumbo-sacral junction fractures and comminuted U-shaped sacral fractures treated by lumbo-sacro-pelvic fixation using iliac screws and discuss about the advantages of the iliac screws over the rod system of Galveston technique.

Diagnosis and surgical treatment of sacral fracture accompanied by neurological damage / 中国矫形外科杂志

[Objective]To study the diagnosis and treatment of sacral fracture accompanied by neurological damage.[Method]Twelve patients with sacral fracture accompanied by nerve injuries were treated and analyzed during 1999 to 2004,including 9 males and 3 females. Final diagnosis was given according to the evaluation of physical examination,X-ray,CT and MRI examinations. Dennis classification found 2 cases of I type,6 cases of Ⅱ type and 4 cases of Ⅲ types.The surgical approach of these patients were selected according to the Dennis classification,Type Ⅰ and type Ⅱ were treated with conservative methods,and operations were taken if little symptom was no or a little improved. Posterior approach enlargement for sacral nerve canal,exploration and endoneurolysis on sacral nerve were performed on type Ⅲ as early as possible.Old fracture of type Ⅱ and type Ⅲ with neurologic signs had to be operated early.Conservative and operative treatments were taken 7 and 5 respectively.[Result]After six months to three years following up,two cases of Denis type Ⅰ,six cases of Denis type Ⅱ and one in four Denis type Ⅲ cases were recovered completely.Two cases of Denis Ⅲ were improved significantly while one case was improved a little.[Conclusion]The anatomical position of sacrum is not conspicuous and the symptom caused by neurological damage is too tiny to detect.Carefully physical examination combined with image analysis is necessary to elevate the rate of final diagnosis.Different surgical treatments were used to different type of sacral fracture. Posterior approach enlargement for sacral nerve canal and exploration and endoneurolysis on sacral nerve may be an ideal choice to treat sacral fracture accompanied by neurological damage.Nerves injuries is an critical operation indication for delayed sacral fracture.

Vertical Sacral Fractures Treated with Iliac Hollow Screws / 中国矫形外科杂志

[Objective]To measure the feasibility and efficiency of treating vertical sacral fractures with iliac hollow screws.[Method]Sixteen patients with vertical sacral fractures were treated.10 cases of Denis type Ⅰ and 6 cases of Denis type Ⅱ.[Result]The average following-up period was 16 months. All fractures united within 3 months.Two cases showed symptoms of root L5 injuries.1 case totally recovered and 1case partly recovered by the 3nd month after operation.[Conclusion]It showed simple and easy to master for clinical applying of treating vertical sacral fractures with iliac hollow screws.

Injury mechanism of sacral plexus resulting from zone-Ⅱ sacral fractures of lateral compression:a cadaveric study / 中国矫形外科杂志

[Objective]To study the injury mechanism of sacral plexus resulting from sacral zone-Ⅱ fractures of lateral compression.[Method]Six short-term(in a year) embalmed pelves were obtained from anatomic department of Hebei Medical University with preserving sacral plexus and resecting pubic symphysis,the models of sacral zone-Ⅱ fractures of lateral compression were produced.Quantitative analysis for fracture displacement was carried out to observe the characteristic and the mechanism of sacral plexus injury.Sacral plexus were replaced by proportional diameter silica gel pips fulled with contrast medium,experimental procedure was repeated under X-ray.The experimental data were analyzed by SPSS10.0 statistic software and the result was obtained.[Result]In lateral compression type sacral canal was closed and its volume reduced and small free fracture segment resulted in sacral plexus nerves oppressed,especially of L_5,Sland S_2.At the same time,the more overlapping of pubic symphsis,the more serious of compression.[Conclusion]Sacral plexus is conncted with the wall of pelvic cavity and fixed.Zone-Ⅱ sacral fracture is likely to damage sacral plexus.In lateral compression type of sacral fracture nerve injury is mainly compression injury which position is in nerve canal,especially of S_1,S_2.And L_5 can be crushed in fracture interspace to be damaged seriously.