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. 2013 Jul 18;4(3):124-9.
doi: 10.5312/wjo.v4.i3.124. Print 2013 Jul 18.

Biomechanical characteristics of bone in streptozotocin-induced diabetic rats: An in-vivo randomized controlled experimental study

Nektarios Korres  1 , Eleftherios Tsiridis, George Pavlou, Athanasios Mitsoudis, Despina N Perrea, Aristedes B Zoumbos
Affiliations

Biomechanical characteristics of bone in streptozotocin-induced diabetic rats: An in-vivo randomized controlled experimental study

Nektarios Korres et al. World J Orthop. .

Abstract

Aim: To investigate the in vivo effects of type I diabetes on the mechanical strength of tibial bone in a rodent model.

Methods: The biomechanical effect of diabetes on the structural integrity of the tibia in streptozotocin induced diabetic Wistar rats was analysed. Induction of diabetes was achieved by an intra-peritoneal injection and confirmed by measuring serial blood glucose levels (> 150 mg/dL). After 8 wk the tibiae were harvested and compared to a control group. Biomechanical analysis of harvested tibiae was performed using a three-point bending technique on a servo hydraulic MTS 858 MiniBionix frame. Maximum force applied to failure (N), stiffness (N × mm) and energy absorbed (N/mm) were recorded and plotted on load displacement curves. A displacement control loading mode of 1 mm/min was selected to simulate quasi-static loading conditions. Measurements from load-displacement curves were directly compared between groups.

Results: Fourteen streptozotocin induced diabetic Wistar rats were compared against nineteen non-diabetic controls. An average increase of 155.2 g in body weight was observed in the control group compared with only 5 g in the diabetic group during the experimental study period. Levels of blood glucose increased to 440.25 mg/dL in the diabetic group compared to 116.62 mg/dL in the control group.The biomechanical results demonstrate a highly significant reduction in the maximum load to failure from 69.5 N to 58 N in diabetic group compared to control (P = 0.011). Energy absorption to fracture was reduced from 28.2 N in the control group to 23.5 N in the diabetic group (P = 0.082). No significant differences were observed between the groups for bending stiffness.

Conclusion: Streptozotocin-induced diabetes in rodents reduces the maximum force and energy absorption to failure of bone, suggesting a predisposition for fracture risk.

Keywords: Biomechanics; Bone; Rodent; Streptozotocin.

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Figures

Figure 1
Figure 1
Mini-Bionix Frame with application of three-point bending at the mid diaphysis.
See this image and copyright information in PMC

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