Abstract
BackgroundFemoral neck fractures in young people are usually Pauwels Type III fractures. The common treatment method are multiple parallel cannulated screws or dynamic hip screw sliding compression fixation. Due to the huge shear stress, the rate of complications such as femoral head necrosis and nonunion is still high after treatment. The aim of our study was to compare the stabilities of two fixation methods in fixating pauwels type III femoral neck fractures.MethodsAll biomimetic fracture samples are fixed with three cannulated screws combined with a medial buttress plate. There were two fixation groups for the buttress plate and proximal fracture fragment: Group A, long screw (40 mm); Group B, short screw (6 mm). Samples were subjected to electrical strain measurement under a load of 500 N, axial stiffness was measured, and then the samples were axially loaded until failure. More than 5 mm of displacement or synthetic bone fracture was considered as construct failure.ResultsThere were no significant differences in failure load (P = 0.669), stiffness (P = 0.842), or strain distribution (P > 0.05) between the two groups.ConclusionsUnicortical short screws can provide the same stability as long screws for Pauwels Type III Femoral Neck Fractures.
Highlights
Femoral neck fractures are fairly common in clinical work, but they are rare in young patients (20–55 years old), who account for only about 3–5% of all cases [1, 2]
The specimen was osteotomized with a band saw, and the cross-section was perpendicular to the neck axis to simulate a Pauwels type III fracture
The stress at the joint between the medial buttress plate and screw was greater than the stress near the cannulated screws, indicating that that the plate can reduce stress
Summary
Femoral neck fractures are fairly common in clinical work, but they are rare in young patients (20–55 years old), who account for only about 3–5% of all cases [1, 2]. Femoral neck fractures in young people are typically high-energy vertical shear injuries, and most are Pauwels type III fractures [3]. Shear force is dominant in femoral neck vertical fractures, so the internal fixator must be able to resist these shearing forces during bone healing [16]. Femoral neck fractures in young people are usually Pauwels Type III fractures. The common treatment method are multiple parallel cannulated screws or dynamic hip screw sliding compression fixation. Due to the huge shear stress, the rate of complications such as femoral head necrosis and nonunion is still high after treatment. The aim of our study was to compare the stabilities of two fixation methods in fixating pauwels type III femoral neck fractures
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