Spinal bone density in women using depot medroxyprogesterone contraception

Obstet Gynecol. 1998 Oct;92(4 Pt 1):569-73. doi: 10.1016/s0029-7844(98)00270-1.

Abstract

Objective: To determine factors possibly associated with reduced bone density in women using the injectable contraceptive depot medroxyprogesterone acetate.

Methods: In a cross-sectional study, bone mineral density of the lumbar spine was measured by dual energy x-ray absorptiometry in 200 current users of depot medroxyprogesterone acetate who had used this method of contraception for 2-26 years and compared with 350 control subjects. Bone density results are expressed as standard deviation scores (z score).

Results: The bone density was significantly lower in depot medroxyprogesterone acetate users (mean z score: -0.65, 95% confidence intervals [CI] -0.80, -0.49, P < .001). Bone density was significantly reduced in nonsmokers and smokers, and there was no significant difference in mean z score between smokers and nonsmokers (mean -0.75 versus -0.58, P=.30). Women who had started depot medroxyprogesterone acetate after the age of 20 years and who had used it for 15 or fewer years had a significantly higher bone density than the remainder of the cohort (mean -0.45 [95% CI -0.62, -0.27] versus -1.02 [95% CI -1.32, -0.73], P < .005). Bone density in depot medroxyprogesterone acetate users was not related to current age, parity, body mass index, calcium intake, or exercise.

Conclusion: Depot medroxyprogesterone acetate use is associated with a significant reduction in bone density, and although a high proportion of depot medroxyprogesterone users do smoke, the reduction in bone density cannot be explained by smoking. Women who use it for a long time and those who start it before peak bone mass is attained may be at highest risk.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Bone Density / drug effects*
  • Contraceptive Agents, Female / pharmacology*
  • Cross-Sectional Studies
  • Female
  • Humans
  • Medroxyprogesterone Acetate / pharmacology*
  • Middle Aged
  • Spine

Substances

  • Contraceptive Agents, Female
  • Medroxyprogesterone Acetate