[Does the vitamin K2 play a role in the prevention or treatment of osteoporosis? - a systematic review]

SZILI Balázs, TAKÁCS István

MARCH 30, 2014

LAM KID - 2014;4(01)

[The physiological role of vitamin K in blood clotting and bone metabolism is well known. A number of articles have been published recently about the effects of vitamin K2 on bone. Non-professional media promotes vitamin K2 as a potent tool for the prevention and treatment of osteoporosis. Nevertheless vitamin K2 is not included in either Hungarian, or European, or Ameri­can guidelines as an anti-osteoporotic me­dication. Our aim was to review the literature and provide a systematic review on the role of vitamin K2 in the prevention and treatment of osteoporosis. We have searched articles on available on 14. February 2014. Our search terms were: („vitamin K2” OR „menaquinon” OR „MK-7” OR „menantrenon”) AND „osteoporosis”. We have only reviewed original articles that discussed the relationship of vitamin K2 and osteoporosis, and had at least the abstract available in English. Of the 155 articles found, 135 had a relevant topic, 126 had at least the abstract in English. Of these, 73 were original articles, including 44 human studies (8 double-blind, controlled, 26 open-label, controlled, 5 observational and 5 cross-sectional studies) and 29 animal or in vitro models. In the non-Asian population there is no evidence for fracture-preventing or BMD-increasing effect of vitamin K2 treatment. The currently recommended anti-osteoporotic medications are significantly more efficient compared with the BMD increase observed in some Asian studies. ]



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[The Hungarian EFEZUS study (Estimation oF the Effectiveness of Zoledronic acid in Use in Steroid-induced osteoporosis in real life) was a multicentre, prospective, non-interventional, open-label, one-year-long study, in which we assessed the effect of zoledronic acid on bone mineral density and on the markers of bone turnover in osteoporosis developing after treatment with glucocorticoids. The mean baseline lumbar BMD was 0.762 g/cm2 and by the end of 12 month it increased to 0.818 g/cm2 (p<0.0001). The mean BMD measured at the femoral neck during visit 1 was 0.675 g/cm2, and it increased to 0.711 g/cm2 by visit 2 (end of study) (p<0.0005). The levels of bone turnover markers (cTX, nTX) significantly decreased between visits 1 and 2 (p<0.05). The mean cTX level at visit 1 was 421.2 ng/l (SD: 309 ng/l), which decreased to 253.3 ng/l (SD: 188.1 ng/l) by visit 2. The mean change in the levels of nTX was 0.65 µg/l (SD: 0.36 µg/l) and 0.39 µg/l (SD: 0.28 µg/l), respectively. There was no major change in serum and urine calcium levels. Five adverse events were reported by 4 patients during the study. ]

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