Design and biomechanical study of slide-poking external fixator for hip fracture. Issue 12 (December 2020)

• Record Type: Journal Article
• Authors: Chen, Hua-Biao; Wu, Hong-Bo; Chen, Min; Huang, Yu-Liang
• Is Part Of: Journal of international medical research. Volume 48:Issue 12(2020)
• Publication Date: 2020-12
• Subjects: Design -- hip fracture -- external fixator -- dynamic hip screw -- biomechanics -- stability; Medicine -- Periodicals; Pharmacology -- Periodicals; 610.5
• DOI: 10.1177/0300060520950934
• Languages: English
• ISSNs: 0300-0605

Abstract

Background: Femoral head collapse and coxa vara lead to internal fixator failure in elderly patients with hip fracture. External fixator application is an optimal choice; however, the existing methods have many disadvantages. Methods: Type 31-A1.3 hip fracture models were developed in nine pairs of 1-year-old fresh bovine corpse femur specimens. Each left femur specimen was fixed by a dynamic hip screw (control group), and each right femur specimen was fixed by the slide-poking external fixator (experimental group). Vertical loading and torsion tests were then performed in both groups. Results: In the vertical loading experiment, a 1000-N load was implemented. The mean vertical downward displacement of the femoral head in the experimental and control groups was 1.49322 ± 0.116280 and 2.13656 ± 0.166374 mm, respectively. In the torsion experiment, when the torsion was increased to 10.0 Nm, the mean torsion angle in the experimental and control groups was 7.9733° ± 1.65704° and 15.4889° ± 0.73228°, respectively. The slide-poking external fixator was significantly more resistant to compression and rotation than the dynamic hip screw. Conclusion: The slide-poking external fixator for hip fractures that was designed and developed in this study can provide sufficient stability to resist compression and rotation in hip fractures.