Journal of Korean Neurosurgical Society

The Korean Neurosurgical Society (대한신경외과학회)
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Effect of Dietary Calcium on Spinal Bone Fusion in an Ovariectomized Rat Model

  • Cho, Jae-Hoon (Department of Neurosurgery, School of Medicine, Kyungpook National University) ;
  • Cho, Dae-Chul (Department of Neurosurgery, School of Medicine, Kyungpook National University) ;
  • Yu, Song-Hee (Department of Neurosurgery, School of Medicine, Kyungpook National University) ;
  • Jeon, Young-Hoon (Department of Anesthesiology and Pain Medicine, School of Dentistry, Kyungpook National University) ;
  • Sung, Joo-Kyung (Department of Neurosurgery, School of Medicine, Kyungpook National University) ;
  • Kim, Kyoung-Tae (Department of Neurosurgery, School of Medicine, Kyungpook National University)
  • Received : 2012.04.10
  • Accepted : 2012.10.04
  • Published : 2012.10.28
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Abstract

Objective : To evaluate the effect of calcium supplementation on spinal bone fusion in ovariectomized (OVX) rats. Methods : Sixteen female Sprague Dawley rats underwent bilateral ovariectomy at 12 weeks of age to induce osteoporosis and were randomly assigned to two groups : control group (n=8) and calcium-supplemented group (OVX-Ca, n=8). Autologous spinal bone fusion surgery was performed on both groups 8 weeks later. After fusion surgery, the OVX-Ca group was supplemented with calcium in drinking water for 8 weeks. Blood was obtained 4 and 8 weeks after fusion surgery. Eight weeks after fusion surgery, the rats were euthanized and the L4-5 spine removed. Bone fusion status and fusion volume were evaluated by manual palpation and three-dimensional computed tomography. Results : The mean fusion volume in the L4-5 spine was significantly greater in the OVX-Ca group ($71.80{\pm}8.06mm^3$) than in controls ($35.34{\pm}8.24mm^3$) (p<0.01). The level of osteocalcin, a bone formation marker, was higher in OVX-Ca rats than in controls 4 weeks ($610.08{\pm}10.41$ vs. $551.61{\pm}12.34$ ng/mL) and 8 weeks ($552.05{\pm}19.67$ vs. $502.98{\pm}22.76$ ng/mL) after fusion surgery (p<0.05). The level of C-terminal telopeptide fragment of type I collagen, a bone resorption marker, was significantly lower in OVX-Ca rats than in controls 4 weeks ($77.07{\pm}12.57$ vs. $101.75{\pm}7.20$ ng/mL) and 8 weeks ($69.58{\pm}2.45$ vs. $77.15{\pm}4.10$ ng/mL) after fusion surgery (p<0.05). A mechanical strength test showed that the L4-5 vertebrae in the OVX-Ca group withstood a 50% higher maximal load compared with the controls (p<0.01). Conclusion : Dietary calcium given to OVX rats after lumbar fusion surgery improved fusion volume and mechanical strength in an ovariectomized rat model.

Keywords

References

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