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Axial compression along the neck
30%
8/27
Axial compression along the shaft of the femur
0%
0/27
Bending load, resulting in tensile stresses on the inferior aspect of the neck
63%
17/27
Torsional loading
Tensile stresses on both the superior and inferior sides along the neck
7%
2/27
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In general, an impact load on the side of the hip can be considered a resultant of two forces, one along the axis of the femoral neck and the other perpendicular to the neck. The component that is along the axis will generate compressive stresses; however, the magnitudes of these stresses are smaller than those generated by bending, and bone is stronger in compression than in tension. The component of load that is perpendicular to the femoral neck will bend the neck, generating tensile stresses on the "concave" side and tensile stresses on the "convex" side. In this patient, the fracture initiated on the inferior aspect of the neck; therefore, this area was probably subjected to tensile stress. Torsional loads are caused by twisting about the long axis of a bone, which is unlikely in this patient.
1.7
(27)
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