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Fig. 2 | Journal of Orthopaedic Surgery and Research

Fig. 2

From: Biomechanical analysis of the posterior bony column of the lumbar spine

Fig. 2

Typical stress–strain curve (a). Each group fitting curve (b). a A typical stress–strain plot is divided into three parts: the elastic, plastic, and breaking phases; the horizontal and vertical axes represent the strain and stress diagrams, respectively. The OA segment is the elastic stage, representing the slope of the curve; the AB segment is the plastic stage, where B is the maximum load corresponding with ultimate strength; and the BC segment is the fracture stage, where C is the point for the specimen to completely fracture. The curve has a good linear relationship (OA), then increased before B and decreased to C. Each group fitting curve is represented in b. All curves are stopped at the maximum compressive stress, each set of the curves in the initial stage gradually separated, and no overlap is observed. The slope of the curve in each group set up on the edge of the lamina group, curve peaks corresponding to the maximum pressure on the facet group

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