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  • Title: Comparison of biochemical markers of bone turnover and bone mineral density between hip fracture and vertebral fracture.
    Author: Takahashi M, Naitou K, Ohishi T, Nagano A.
    Journal: J Clin Densitom; 2003; 6(3):211-8. PubMed ID: 14514989.
    Abstract:
    Bone density and the biochemical markers of bone turnover were compared between 26 hip-fracture patients and 41 vertebral-fracture patients after age adjustment to investigate whether or not type of osteoporosis differs between hip fracture and vertebral fracture. C-Terminal propepides of type I collagen (PIPC) was lower in hip fracture than vertebral fracture. The other bone formation markers (bone-specific alkaline phosphatase [ALP], osteocalcin) tended to be lower, and bone resorption markers (deoxypyridinoline, C-telopeptide crosslinking of type I collagen [CTX] tended to be higher in hip fracture compared to vertebral fracture. Mean of Z-scores of spine bone mineral density (BMD) in hip fracture and vertebral fracture were -0.461 and -0.919, respectively. Mean of Z-scores of femoral neck BMD in hip fracture and vertebral fracture were -0.994 and -0.361, respectively. All Z-scores were negative values, which means reduction of BMD compared to decade-matched controls. Z-scores of bone formation markers, such as bone-specific ALP, osteocalcin, and PIPC, were positive values in vertebral fracture, which means an increase against decade-matched controls, whereas those were negative values in hip fracture. Z-scores of bone resorption markers, such as deoxypyridinoline and CTX, were greater in hip fracture than in vertebral fracture. To express bone balance between formation and resorption in hip fracture and vertebral fracture, we calculated an uncoupling status index (USI) by the values of biochemical markers. USI of hip fracture showed a great negative value (-1.29), which indicates excess of bone resorption over formation, whereas that of vertebral fracture showed a small positive value (0.23). In conclusion, bone formation markers increase in vertebral fractures, but decrease in hip fracture. Bone resorption markers increase in both fracture, but greater increase in hip fracture.
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