scholarly journals Clinical observation and finite element analysis of cannulated screw internal fixation in the treatment of femoral neck fracture based on different reduction quality

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Gan Zhao ◽  
Ming Liu ◽  
Bin Li ◽  
Haizhong Sun ◽  
Biaofang Wei
Keyword(s):  
Finite Element ◽  
Femoral Neck ◽  
Internal Fixation ◽  
Femoral Neck Fracture ◽  
Cannulated Screw ◽  
Anatomical Reduction ◽  
Significant Difference ◽  
Reduction Group ◽  
Neck Fracture ◽  
Time From Injury

Abstract Objective Femoral neck fracture is one of the most common bone types. The effect of reduction quality on hip joint function and complications after screw internal fixation is not fully understood. To investigate the clinical efficacy and mechanical mechanism of positive buttress, anatomical reduction, and negative buttress in the treatment of femoral neck fracture after cannulated screw fixation. Methods Retrospective analysis of patients with femoral neck fracture treated with three cannulated screws internal fixation in our hospital from January 2013 to December 2018. According to the quality of fracture reduction, the patients were divided into positive buttress group, anatomical reduction group, and negative buttress group. Basic information such as injury mechanism, time from injury to surgery, Garden classification and Pauwels classification was collected, Harris scores were performed at 3 months, 6 months, and 12 months after surgery, and postoperative complications (femoral head necrosis, femoral neck shortening, and femoral neck nonunion) were collected. At the same time, three groups of finite element models with different reduction quality were established for stress analysis, their stress clouds were observed and the average displacement and stress of the three groups of models were compared. P < 0.05 was used to represent a statistically significant difference. Results A total of 225 cases of unilateral femoral neck fractures were included and followed up for an average of 4.12 ± 0.69 years. There was no significant difference in age, gender, side, injury mechanism, time from injury to surgery, BMI, Garden classification, Pauwels classification, and follow-up time among the three groups (P > 0.05). However, there was significant difference in Harris score at 6 and 12 months after operation among the three groups (P < 0.05), which was higher in the positive buttress group and anatomical reduction group than in the negative buttress group. In addition, the incidence of osteonecrosis of the femoral head in the negative buttress group (32.2%) was greater than that in the anatomical reduction group (13.4%) and the positive buttress group (5.4%) (P < 0.05). In addition, the incidence of femoral neck nonunion and femoral neck shortening in the negative buttress group was also higher than that in the anatomical reduction positive buttress group (P < 0.05). The finite element results showed that the stress and fracture end displacement in the negative buttress group were greater than those in the positive buttress group (P < 0.05). Conclusion Both positive buttress and anatomical reduction in the treatment of femoral neck fracture with cannulated screw internal fixation can obtain better clinical effect and lower postoperative complications. Positive brace support and anatomic reduction can limit the restoration of femoral stress conduction. Therefore, it is not necessary to pursue anatomical reduction too deliberately during surgery, while negative buttress reduction should be avoided.

scholarly journals Clinical Observation and Finite Element Analysis of Cannulated Screw Internal Fixation in the Treatment of Femoral Neck Fracture Based on Different Reduction Quality

2021 ◽  
Author(s):  
Gan Zhao ◽  
Ming Liu ◽  
bin Li ◽  
haizhong Sun ◽  
Biaofang Wei
Keyword(s):  
Finite Element ◽  
Femoral Neck ◽  
Internal Fixation ◽  
Femoral Neck Fracture ◽  
Cannulated Screw ◽  
Anatomical Reduction ◽  
Significant Difference ◽  
Reduction Group ◽  
Neck Fracture ◽  
Time From Injury

Abstract Objective: Femoral neck fracture is one of the most common bone types. The effect of reduction quality on hip joint function and complications after screw internal fixation is not fully understood. To investigate the clinical efficacy and mechanical mechanism of positive buttress, anatomical reduction and negative buttress in the treatment of femoral neck fracture after cannulated screw fixation.Methods: Retrospective analysis of patients with femoral neck fracture treated with three cannulated screws internal fixation in our hospital from January 2013 to December 2018.According to the quality of fracture reduction, the patients were divided into positive buttress group, anatomical reduction group and negative buttress group. Basic information such as injury mechanism, time from injury to surgery, Garden classification and Pauwels classification was collected, Harris scores were performed at 3 months, 6 months and 12 months after surgery, and postoperative complications (femoral head necrosis, femoral neck shortening and femoral neck nonunion) were collected. At the same time, three groups of finite element models with different reduction quality were established for stress analysis, their stress clouds were observed and the average displacement and stress of the three groups of models were compared. P < 0.05 was used to represent a statistically significant difference.Results: A total of 225 cases of unilateral femoral neck fractures were included and followed up for an average of 4.12 ± 0.69 years. There was no significant difference in age, gender, side, injury mechanism, time from injury to surgery, BMI, Garden classification, Pauwels classification and follow-up time among the three groups (P > 0.05).However, there was significant difference in harris score at 6 and 12 months after operation among the three groups (P < 0.05), which was higher in the positive buttress group and anatomical reduction group than in the negative buttress group. In addition, the incidence of osteonecrosis of the femoral head in the negative buttress group (32.2%) was greater than that in the anatomical reduction group (13.4%) and the positive buttress group (5.4%) (P < 0.05). In addition, the incidence of femoral neck nonunion and femoral neck shortening in the negative buttress group was also higher than that in the anatomical reduction positive buttress group (P < 0.05). The finite element results showed that the stress and fracture end displacement in the negative buttress group were greater than those in the positive buttress group (P < 0.05).Conclusion: Both positive buttress and anatomical reduction in the treatment of femoral neck fracture with cannulated screw internal fixation can obtain better clinical effect and lower postoperative complications. Positive brace support and anatomic reduction can limit the restoration of femoral stress conduction. Therefore, it is not necessary to pursue anatomical reduction too deliberately during surgery, while negative buttress reduction should be avoided.

Modified F Configuration in the Treatment of Pauwels Type III Femoral Neck Fracture: a Finite Element Analysis

2021 ◽  
Author(s):  
Shiyuan Lin ◽  
Huizi Li ◽  
Kai Tong ◽  
Zihang Feng ◽  
Gang Wang ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Femoral Neck ◽  
Femoral Neck Fracture ◽  
Femoral Neck Fractures ◽  
Cannulated Screw ◽  
Type Iii ◽  
Neck Fracture ◽  
Maximum Crack ◽  
Hip Screw

Abstract Background: The optimal treatment of Pauwels type III femoral neck fracture in young patients remains a worldwide challenge in orthopedic surgery. Methods: Finite element models of four internal fixations were developed to treat Pauwels type III Femoral neck fracture: a: the traditional inverted triangular cannulated screw model, b: the F-technique cannulated screw model, c: the modified F-technique cannulated screw model using a fully threaded screw instead of a partially threaded distally, d: the dynamic hip screw coupled with anti-rotational screw model. Under the same conditions, finite element analyses were carried out to compare the displacement and von Mises stress distribution of four internal fixations and femurs, the maximum crack distances of the fracture surfaces, Z axis displacements of four models as well as the stress distribution in the subtrochanteric region. Results: The modified F-technique configuration resulted in a more stable fixation as compared to the other three approaches, with respect to the maximum displacement and stress peaks of femur and internal fixations, the maximum crack distances of the fracture surfaces, Z axis displacements of four configurations as well as the stress distribution in the subtrochanteric region.Conclusions: Our results suggested that modified F-technique configuration show a better performance in resisting shearing and rotational forces in treating Pauwels type III femoral neck fractures compared to those using traditional inverted triangular, the F-technique configuration or dynamic hip screw coupled with anti-rotational screw, providing a new choice for the treatment of femoral neck fractures.

scholarly journals Essential Role of Reliable Reduction Quality in Internal Fixation of Femoral Neck Fractures in the Non-elderly Patients—A Propensity Score Matching Analysis

2021 ◽  
Author(s):  
Longhai Qiu ◽  
Yuliang Huang ◽  
Guowen Li ◽  
Hongbo Wu ◽  
Zhiwen Zhang ◽  
...  
Keyword(s):  
Survival Analysis ◽  
Propensity Score ◽  
Femoral Neck ◽  
Internal Fixation ◽  
Femoral Neck Fracture ◽  
Reoperation Rate ◽  
Femoral Neck Fractures ◽  
Kaplan Meier ◽  
Reduction Group ◽  
Neck Fracture

Abstract Background: The rate of failure of internal fixation for femoral neck fractures has remained largely unchanged over the past 30 years. The current study attempted to identify the controllable variables influencing the failure of internal fixation of femoral neck fractures. Methods:The study included 190 patients aged from 20 to 65 with femoral neck fracture caused by low energy violent injuries, who were treated with multiple cannulated screws over the period 2005-2019 at a single centre. Kaplan-Meier (KM) survival analysis was firstly utilized to evaluate the potential interaction between each variable and cumulative rates of reoperation. If P < 0.1 in KM survival analysis, the variables would be included in subsequent Cox survival analysis to explore the influencing need for reoperation of a femoral neck fracture. Next, all of the 190 patients were divided into perfect reduction group (Garden Alignment Index Ⅰ) and imperfect reduction group (Garden Alignment Index Ⅱ, Ⅲ, Ⅳ). Propensity score matching (PSM) analysis resulted in 39 pairs. After the baseline variables were balanced between the two groups, Cox survival analysis was utilized again to explore the variables influencing the need of reoperation of a femoral neck fracture. Finally, KM survival analysis was utilized to compare the cumulative rate of reoperation between perfect reduction (Group PR) and imperfect reduction（Group IR）as a subgroup analysis. Results: Before PSM analysis, the mean age was 49.96±12.02 years and the total reoperation rate was 17.40%. Cox survival analysis showed that only reduction quality was interrelated with the need for reoperation before PSM analysis and after PSM analysis. Kaplan–Meier cumulative reoperation rate was higher in Group IR than in Group PR after PSM analysis. Conclusion: To prolong the service life of the original femoral head, it is essential to achieve a completely anatomical reduction and maintain the reduction quality until the patient fully recovers.

scholarly journals Assessing the effect of gotfried reduction with positive buttress pattern in the young femoral neck fracture

2020 ◽  
Author(s):  
Kai Huang ◽  
Xiaohui Fang ◽  
Guijun Li ◽  
Jiajun Yue
Keyword(s):  
Femoral Neck ◽  
Femoral Neck Fracture ◽  
Clinical Results ◽  
Anatomic Reduction ◽  
Significant Difference ◽  
Reduction Group ◽  
Neck Fracture ◽  
Group A ◽  
Group B

Abstract Background: Although many available surgical procedures for displaced femoral neck fractures in young patients, there are still many challenges to achieve satisfactory results. The incidence of avascular necrosis and nonunion rates remain relatively high despite the progress in our understanding and surgical technique. The purpose of this study was to evaluate the clinical efficacy of gotfried reduction and cannulated screw fixation in the treatment of femoral neck fracture for young adults. Methods: A retrospective analysis was made on 67 cases from May 2013 to March 2019. They were divided into three groups according to the first postoperative anteroposterior view of hip X-ray: Anatomic reduction (group A), Gotfried positive buttress reduction (group B), and Gotfried negative buttress reduction (group C). The incidence of avascular osteonecrosis of the femoral head ( AVN ) and the Harris scores of hip joints were compared in three groups at the last follow-up. Results: The mean follow-up period after surgery was 22.5 ± 11.3 (range, 11–34) months. There were 21 cases (mean age,49.7 ± 11.6) in group A, 24 cases (mean age, 48.6 ± 11.3) in group B, 22 cases (mean age,48.3 ± 12.4) in group C. No significant difference in general preoperative demographics (P>0．05). The incidence of avascular necrosis of femoral head in Group A, B, and C was 19.05%,20.83%, and 22.73 %, respectively, showing no significant difference between groups(P=0．156). The mean Harris hip scores at the final follow-up for groups A (85．6±6．7)and B (84．5±6．2) were significantly higher than group C (74．3±8.3), and the difference was statistically significant(P=0．043). The incidence of femoral neck shortening in group A and group B was significantly lower than that in group C in postoperative one year, and the difference was statistically significant (P<0.05). Conclusions: Gotfried positive buttress reduction and fixation for femoral neck fracture may lead to similar clinical results with anatomic reduction, but much better than Gotfried negative buttress reduction. For the patients of femoral neck fracture with severe displacement and difficulty reduction, it is not necessary to pursue anatomical reduction。 Achieving positive valgus reduction can also obtain satisfactory clinical results, and should try to avoid negative buttress.

scholarly journals Gotfried reduction and cannulated screws fixation in the treatment of femoral neck fracture in young adults

2020 ◽  
Author(s):  
Kai Huang ◽  
Xiaohui Fang ◽  
Guijun Li ◽  
Jiajun Yue
Keyword(s):  
Femoral Neck ◽  
Femoral Neck Fracture ◽  
Clinical Results ◽  
Anatomic Reduction ◽  
Significant Difference ◽  
Reduction Group ◽  
Neck Fracture ◽  
Group A ◽  
Group B

Abstract Background: Although many available surgical procedures for displaced femoral neck fractures in young patients, there are still many challenges to achieve satisfactory results. The incidence of avascular necrosis and nonunion rates remain relatively high despite the progress in our understanding and surgical technique. The purpose of this study was to evaluate the clinical efficacy of gotfried reduction and cannulated screw fixation in the treatment of femoral neck fracture for young adults.Methods: A retrospective analysis was made on 67 cases from May 2013 to March 2019. They were divided into three groups according to the first postoperative anteroposterior view of hip X-ray: Anatomic reduction (group A), Gotfried positive buttress reduction (group B), and Gotfried negative buttress reduction (group C). The incidence of avascular osteonecrosis of the femoral head (AVN) and the Harris scores of hip joints were compared in three groups at the last follow-up.Results: There were 21 cases (mean age,49.7 ± 11.6) in group A, 24 cases (mean age, 48.6 ± 11.3) in group B, 22 cases (mean age,48.3 ± 12.4) in group C. No significant difference in general preoperative demographics (P>0．05).The incidence of avascular necrosis of femoral head in Group A, B, and C was 19.05%,20.83%, and 22.73 %, respectively, showing no significant difference between groups(P=0．156). The mean Harris hip scores at the final follow-up for groups A (85．6±6．7)and B (84．5±6．2) were significantly higher than group C (74．3±8.3), and the difference was statistically significant(P=0．043).Conclusions: Gotfried positive buttress reduction and fixation for femoral neck fracture may lead to similar clinical results with anatomic reduction, but much better than Gotfried negative buttress reduction. For the patients of femoral neck fracture with severe displacement and difficulty in reduction, it is not necessary to pursue anatomical reduction。Achieving positive valgus reduction can also obtain satisfactory clinical results, and should try to avoid negative buttress.

scholarly journals Computer-assisted cannulated screw internal fixation versus conventional cannulated screw internal fixation for femoral neck fractures: a systematic review and meta-analysis

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Qing-hao Cheng ◽  
Peng-biao Li ◽  
Ting-ting Lu ◽  
Shi-fang Guo ◽  
Wen-fei Di ◽  
...  
Keyword(s):  
Femoral Neck ◽  
Internal Fixation ◽  
Fracture Healing ◽  
Femoral Neck Fracture ◽  
Meta Analysis ◽  
Operation Time ◽  
Healing Time ◽  
Cannulated Screw ◽  
Computer Assisted ◽  
Neck Fracture

Abstract Objective To compare the effects between computer-assisted and traditional cannulated screw internal fixation on treating femoral neck fracture. Methods The search was conducted in Embase, Pubmed, Web of Science, Cochrane Library, China National Knowledge Infrastructure (CNKI) and Wanfang Database from the beginning to August 2020. RevMan5.4 software, which was provided by the International Cochrane Group, was used for the meta-analysis comparing the differences in operation time, intraoperative bleeding volume, fluoroscopy frequency, fracture healing time, total drilling times, Harris score, fracture healing rate, and femoral head necrosis rate between computer-assisted and traditional methods groups. Results A total of 1028 patients were included in 16 studies. Primary outcome indicators: Compared with the traditional method group, the computer-assisted group had less operative time (2RCTs, P < 0.00001; 8 non-RCTs, P = 0.009; Overall, P < 0.00001), intraoperative bleeding (1 RCTs, P < 0.00001; 9non-RCTs, P < 0.00001; Overall, P < 0.00001), femoral head necrosis rate (1 RCT, P = 0.11;7 non-RCTs, P = 0.09; Overall, P = 0.02) and higher Harris scores (1 RCT, P < 0.0001; 9 non-RCTs, P = 0.0002; Overall, P < 0.0001), and there were no significant differences in fracture healing rate between the two groups (5 non-RCTs, P = 0.17). Secondary outcomes indicators: The computer-assisted group had a lower frequency of intraoperative fluoroscopy and total number of drills compared with the traditional method group, while there was no significant difference in fracture healing time. Conclusion Compared with the traditional hollow screw internal fixation on the treatment of femoral neck fracture, computer-assisted percutaneous cannulated screw fixation can shorten the operation time and improve the operation efficiency and reduce the X-ray injury of medical staff and help patients obtain a better prognosis. Therefore, computer-assisted percutaneous cannulated screw fixation is a better choice for the treatment of femoral neck fracture. Study registration PROSPERO registration number CRD42020214493.

scholarly journals Assessing the effect of Gotfried reduction with positive buttress pattern in the young femoral neck fracture

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Kai Huang ◽  
Xiaohui Fang ◽  
Guijun Li ◽  
Jiajun Yue
Keyword(s):  
Femoral Neck ◽  
Femoral Neck Fracture ◽  
Clinical Results ◽  
Anatomic Reduction ◽  
Significant Difference ◽  
Reduction Group ◽  
Neck Fracture ◽  
Group A ◽  
Group B

Abstract Background Although many available surgical procedures for displaced femoral neck fractures in young patients, there are still many challenges to achieve satisfactory results. The incidence of avascular necrosis and nonunion rates remains relatively high despite the progress in our understanding and surgical technique. The purpose of this study was to evaluate the clinical efficacy of Gotfried reduction and cannulated screw fixation in the treatment of femoral neck fracture for young adults. Methods A retrospective analysis was made on 67 cases from May 2013 to March 2019. They were divided into three groups according to the first postoperative anteroposterior view of hip X-ray: Anatomic reduction (group A), Gotfried positive buttress reduction (group B), and Gotfried negative buttress reduction (group C). The incidence of avascular osteonecrosis of the femoral head (AVN) and the Harris scores of hip joints were compared in three groups at the last follow-up. Results The mean follow-up period after surgery was 22.5 ± 11.3 (range, 11–34) months. There were 21 cases (mean age, 49.7 ± 11.6) in group A, 24 cases (mean age, 48.6 ± 11.3) in group B, 22 cases (mean age, 48.3 ± 12.4) in group C. No significant difference in general preoperative demographics (P > 0.05). The incidence of avascular necrosis of femoral head in group A, B, and C was 19.05%, 20.83%, and 22.73%, respectively, showing no significant difference between groups (P = 0.156). The mean Harris hip scores at the final follow-up for groups A (85.6 ± 6.7) and B (84.5 ± 6.2) were significantly higher than group C (74.3 ± 8.3), and the difference was statistically significant (P = 0.043). The incidence of femoral neck shortening in group A and group B was significantly lower than that in group C in postoperative 1 year, and the difference was statistically significant (P < 0.05). Conclusions Gotfried positive buttress reduction and fixation for femoral neck fracture may lead to similar clinical results with anatomic reduction, but much better than Gotfried negative buttress reduction. For the patients of femoral neck fracture with severe displacement and difficulty reduction, it is not necessary to pursue anatomical reduction. Achieving positive valgus reduction can also obtain satisfactory clinical results, and should try to avoid negative buttress.

scholarly journals Application of Robot Positioning for Cannulated Screw Internal Fixation in the Treatment of Femoral Neck Fracture: Retrospective Study (Preprint)

2020 ◽  
Author(s):  
Lei Wan ◽  
Xiangyun Zhang ◽  
Dalong Wu ◽  
Zhihao Li ◽  
Dongtao Yuan ◽  
...  
Keyword(s):  
Surgical Treatment ◽  
Femoral Neck ◽  
Internal Fixation ◽  
Fracture Healing ◽  
Femoral Neck Fracture ◽  
Cannulated Screw ◽  
Control Group ◽  
Study Group ◽  
Robot Assisted ◽  
Neck Fracture

BACKGROUND Femoral neck fracture is a common type of hip fracture. Conventional surgical treatment aims at fixing the fracture site with screws and then gradually promoting bone healing. A robot-assisted orthopedic surgery system is computer technology applied to surgical treatment. OBJECTIVE This study aimed to explore the therapeutic effect and prognostic value of percutaneous cannulated screw internal fixation using robot-assisted positioning in patients with femoral neck fractures. METHODS From July 2018 to September 2019, 42 cases of femoral neck fracture admitted to the Second Affiliated Hospital of Luohe Medical College were randomly and averagely divided into control and study groups. The patients in the control group were treated with conventional percutaneous cannulated screw internal fixation, while the patients in the study group were treated with robot-assisted percutaneous cannulated screw fixation during surgical treatment. We compared the treatment conditions and results of the operation between the 2 groups. The Harris score was used to evaluate the treatment efficacy. The state of fracture healing was followed up and compared between the 2 groups. RESULTS The duration of the operation was shorter, there was less fluoroscopy use, and there were fewer drilled holes in the study group than in the control group (all, <i>P</i>&lt;.001). There was no statistical difference in the amount of intraoperative bleeding between the 2 groups (<i>P</i>=.33). The Harris score (<i>P</i>=.045) and number of excellent and good ratings (<i>P</i>=.01) were significantly higher in the study group than in the control group. The difference in the fracture healing rate between the 2 groups was not statistically significant (<i>P</i>=.23). The fracture healing duration of the study group was shorter than that of the control group (<i>P</i>=.001). CONCLUSIONS The use of robotic positioning aids in the treatment of femoral neck fractures with percutaneous cannulated screw fixation can effectively improve the efficiency of surgery, shorten the duration of surgery, and reduce the radiation damage to patients. Meanwhile, it improves postoperative treatment and recovery rates of the patients and shortens the fracture healing time.

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