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Original Articles
- Comparison of Clinical Outcomes for Femoral Neck System and Cannulated Compression Screws in the Treatment of Femoral Neck Fracture
- Jae Kwang Hwang, KiWon Lee, Dong-Kyo Seo, Joo-Yul Bae, Myeong-Geun Song, Hansuk Choi
- J Korean Fract Soc 2023;36(3):77-84. Published online July 31, 2023
- DOI: https://doi.org/10.12671/jkfs.2023.36.3.77
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Abstract
PDF - Purpose
This study compared the clinical and radiological results of the femoral neck system (FNS) and cannulated compression screws (CCS) for the fixation of femoral neck fractures.
Materials and Methods
Patients who underwent FNS or CCS internal fixation for femoral neck fractures between January 2016 and January 2022 were analyzed retrospectively. The hip joint function using the Harris hip score (HHS) was evaluated three months and one year after surgery. The operation time, fracture healing time, and associated surgical complications in the two groups were compared and analyzed statistically.
Results
Seventy-nine patients were categorized into 38 FNS and 41 CCS groups. The FNS group had a longer operation time and higher postoperative HHS at three months (p<0.01). Femoral neck shortening was lower in the FNS group (p=0.022). There were no significant differences in the fracture healing time and other complications.
Conclusion
There were no differences in most clinical outcomes and complications between the two groups except for the three-month HHS and femoral neck shortening. This study suggests that FNS could be an alternative to CCS for treating femoral neck fractures.
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- Computational Simulation of Femoral Neck System and Additional Cannulated Screws Fixation for Unstable Femoral Neck Fractures and the Biomechanical Features for Clinical Applications
- Ju-Yeong Kim
- J Korean Fract Soc 2023;36(1):1-9. Published online January 31, 2023
- DOI: https://doi.org/10.12671/jkfs.2023.36.1.1
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Abstract
PDF
- Purpose
To identify the biomechanical features for clinical applications through a computational simulation of the fixation of the Femoral Neck System (FNS) with additional cannulated screws for a Pauwels type III femoral neck fractures.
Materials and Methods
Thirty cadaveric femurs underwent computed tomography, and the images were transferred to the Mimics ® program, resulting in three-dimensional proximal femur models. A three-dimensional scan of the FNS and 6.5 mm and 7.0 mm cannulated screws was performed to enable computerized virtual fixation of FNS with additional cannulated screws for unstable femoral neck fractures. Furthermore, the cannulated screw used for additional fixation was modeled and used as a cylinder within the Ansys program. The biomechanical characteristics of these models were investigated by applying a physiological load virtually.
Results
The maximum von Mises stress value at bone was 380.14 MPa in FNS and 297.87 MPa in FNS+7.0 mm full-thread cannulated screw. The maximum von Mises stress value at FNS was 786.83 MPa in FNS and 435.62 MPa in FNS+7.0 mm full-thread cannulated screw. The FNS group showed the highest maximum von Mises stress values at bone and FNS. For total deformation, the maximum deformation value was 10.0420 mm in FNS and 9.2769 mm in FNS+7.0 mm full-thread cannulated screws. The FNS group represented the highest maximum deformation compared to the other groups.
Conclusion
Considering the anatomical spatiality and biomechanical characteristics of the FNS in unstable femoral neck fractures, when one 7.0 mm full thread cannulated screw was also fixed to the anterosuperior portion of the FNS, significant biomechanical stability was demonstrated.
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