Subtrochanteric Fracture After Cannulated Screw Fixation of Femoral Neck Fractures: A Report of Four Cases

Iatrogenic subtrochanteric fractures are rarely encountered after cannulated screw fixation of femoral neck fractures; however, when they do occur, there can be several complications. Many orthopedic surgeons have concerns about the potential for iatrogenic subtrochanteric fractures after screw fixation distal to the trochanter minor; therefore, some surgeons are typically reluctant to perform this procedure. This study focused on the risk of an iatrogenic subtrochanteric fracture after treating femoral neck fractures with cannulated screws. The main purpose of the study was to understand iatrogenic subtrochanteric fractures and evaluate the effects on these fractures of an inverted triangular–shaped configuration for placement of the cannulated screws. A femur bone with an femoral neck fracture at a 40° incline to the horizontal plane was generated along with a representation of a three-dimensional finite element model, and three inverted triangular–shaped configurations for placement of the cannulated screws were investigated using finite element analyses. Statistical results indicated that the occurrence risk of ISF increases when the screw is located distal to the trochanter minor. Moreover, the risk of occurrence of intertrochanteric fracture increases when the screw is located medial to the trochanter minor because of local concentrated stress on the surface of the screw canals. To avoid the vulnerability of the subtrochanteric region, it was found that proximal placement of the screws using the inverted triangular–shaped configuration could yield better results. In addition, the results of this study provide suggestions on improved screw configurations.

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Closed Reduction And Cannulated Screw Fixation For Pediatric Femoral Neck Fractures: A Case Series

Turkish Journal of Hip Surgery ◽

10.5222/tjhs.2021.87597 ◽

2021 ◽

Author(s):

Hakan Cici ◽

Sabahaddin Kiliç

Keyword(s):

Femoral Neck ◽

Closed Reduction ◽

Screw Fixation ◽

Case Series ◽

Femoral Neck Fractures ◽

Cannulated Screw ◽

Fixation Method ◽

Coxa Vara

Objective: Pediatric femoral neck fractures are uncommon injuries. Accurate early reduction and fixation is recommended to avoid serious long-term complications. The aim of this study was to analyze the clinical and radiological outcomes of 12 children with femoral neck fractures who were treated with closed reduction and cannulated screw fixation. Method: Between November 2015 and December 2019, 12 children (4 males,8 females) with an average age of 9.7 were operated by closed reduction and cannulated screw fixation for femoral neck fractures. We evaluated the medical records of all patients, including age, gender, injury mechanism, fracture type, initial displacement, postoperative reduction, follow-up roentgenograms and Ratliff’s scores. Results: The mean follow-up was 22.3 months (range 12–47 months). Six Delbett type 2, five Delbett type 3 and one Delbett type 4 fractures were operated with an avarage time to surgery of 12.5 (range: 1-75 hours). Satisfactory outcomes according to Ratliff’s criteria were obtained in 10 (%83.3) children. Coxa vara occurred in 2 cases. Any avascular necrosis was not seen during the follow-up period. Conclusion: Early closed reduction and cannulated screw fixation may be effective to avoid long-term complications in pediatric femoral neck fractures. Keywords: Femoral neck fracture, Pediatric, Closed reduction

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