Human Reproduction, Vol. 15, No. 1, 118-122,
January 2000
© 2000 European Society of Human Reproduction and Embryology
Bone mineral density during long-term use of the progestagen contraceptive implant Implanon® compared to a non-hormonal method of contraception
1 Streekziekenhuis Koningin Beatrix, Winterswijk, The Netherlands, 2 Research and Development, NV Organon, Oss, The Netherlands, 3 Chilean Institute of Reproductive Medicine, Santiago, Chile and 4 Department of Obstetrics and Gynaecology, University of Oulu, Oulu, Finland
An open, prospective, comparative study was done in healthy women, aged between 18 and 40 years, to study the effects of long-term etonogestrel treatment on bone mineral density (BMD). The control group used a non-hormone-medicated intrauterine device (IUD). The BMD was measured using a dual energy X-ray absorptiometry instrument. Measurements included the lumbar spine (L2L4), the proximal femur (femoral neck, Ward's triangle, trochanter) and distal radius. The period of treatment was 2 years and 44 women in the Implanon® group and 29 in the IUD group provided data. Groups were comparable at baseline with respect to age, weight, body mass index, BMD and 17ß-oestradiol status. Changes from baseline in BMD in the Implanon® group were not essentially different from those in the IUD group. There was no relationship between 17ß-oestradiol concentrations and changes in BMD in this study population. The results of the present study indicate that Implanon® can safely be used in young women who have not yet achieved their peak bone mass.
Key words: bone mineral density/contraceptive implant/etonogestrel/3-ketodesogestrel/17ß-oestradiol
5 To whom correspondence should be addressed at: Clinical Development Department, NV Organon, PO Box 20, 5340 BH Oss, The Netherlands
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