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Steen Bønløkke Pedersen

Vitamin K2 (menaquinone-7) prevents age-related deterioration of trabecular bone microarchitecture at the tibia in postmenopausal women

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OBJECTIVE: Clinical studies suggest that vitamin K2 protects against bone loss and fractures, however, the effect on bone quality has never been investigated. We investigated the effect of vitamin MK-7 on undercarboxylated osteocalcin (ucOC), bone mass and quality.

DESIGN: We conducted a randomized, placebo-controlled, double-blinded clinical trial.

METHODS: We investigated the effect of MK-7 375 µg for 12 months on bone mineral density (BMD) measured by dual x-ray absorptiometry (DXA), bone microarchitecture measured by high resolution peripheral quantitative computed tomography (HRpQCT) and biochemical bone turnover markers in 148 postmenopausal women with osteopenia. All were supplemented with calcium and vitamin D.

RESULTS: ucOC decreased in the MK-7 group (-65.6 (59.1; 71.0)%) (median (CI)) compared to the placebo group (-6.4 (-13.5; 1.2)%) after 3 months (p<0.01). HRpQCT after 12 months, demonstrated that trabecular number in tibia was unchanged in the MK-7-group (-0.1±1.9%)(mean±SD) and decreased in the placebo-group (-3.5±2.2%), trabecular spacing was unchanged in the MK-7-group (+1.2±8.0%) and increased in the placebo-group (+4.5±9.7%), and trabecular thickness was unchanged in the MK-7-group (+0.2±1.7%) and increased in the placebo-group (+4.0±2.2%) (between group changes for all: p<0.05). There were no significant differences between the groups in HRpQCT derived parameters at the radius or in BMD at any site.

CONCLUSION: The changes in bone microarchitecture in the placebo-group are consistent with the age-related deterioration of trabecular structure, with a loss of trabeculae and a greater mean thickness of the remaining trabeculae. This suggests that vitamin MK-7 preserves trabecular bone structure at the tibia.

TidsskriftEuropean Journal of Endocrinology
StatusUdgivet - 13 sep. 2016

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