Experimental Study of a Novel Internal Fixation Device for the Treatment of Femoral Neck Fractures
Department of Orthopedic Surgery, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Key Laboratory of Rheumatic Disease and Translational Medicine, Jinan 250000, China
| Abstract: | Objective To compare the biomechanical properties of a novel internal fixation device for femoral neck fractures with those of the dynamic hip screw (DHS) system, and to evaluate its mechanical performance under experimental conditions. Methods A standardized femoral neck fracture model was established using SAWBONES femoral specimens. The novel internal fixation device (experimental group) and the DHS system (control group) were implanted separately, with five specimens in each group. Static compression tests were performed to determine the overall stiffness, yield load, and yield displacement of the fixation constructs. Compression fatigue tests using a stepwise loading protocol were conducted to evaluate fatigue endurance by recording the number of cycles to failure at different load levels. Finite element models were established under identical geometric and material assumptions, and stress and displacement distributions were analyzed using ANSYS 15.0 software. Results In the static compression test, the experimental group demonstrated a stiffness of 5040.1 ± 55.86 N/mm, a yield load of 4369.7 ± 52.53 N, and a yield displacement of 1.12 ± 0.01 mm, while the corresponding values in the control group were 4967.6 ± 155.07 N/mm, 4161.9 ± 96.20 N, and 1.11 ± 0.01 mm, respectively. The static mechanical performance of the two groups was generally comparable. In the compression fatigue test, both fixation systems successfully completed 1,000,000 loading cycles under a minimum load of 220 N and a maximum load of 2200 N without failure, indicating similar fatigue endurance. Finite element analysis showed comparable patterns of stress concentration and displacement distribution between the two fixation constructs. Conclusion The novel internal fixation device for femoral neck fractures demonstrated biomechanical performance comparable to that of the DHS system in terms of static strength, fatigue endurance, and finite element mechanical response, providing mechanical evidence for further experimental and clinical investigations. |
| Keywords: | Femoral Neck Fracture; Internal Fixation; Biomechanics; Finite Element Analysis; Fatigue Test |
| DOI: | 10.57237/j.cmf.2026.03.001 |
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Received: 7 May 2026
Accepted: 8 June 2026
Published Online: 28 July 2026
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