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Serial Motherhood and HRT Boost Likelihood of Knee Replacement

by VR Sreeraman on October 29, 2008 at 11:58 AM
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 Serial Motherhood and HRT Boost Likelihood of Knee Replacement

Serial motherhood, hormone replacement therapy, and early puberty all boost the likelihood of joint surgery, especially knee replacement, reveals a large study published ahead of print in the Annals of the Rheumatic Diseases.

The findings are based on 1.3 million middle aged UK women whose health was tracked from around the age of 50 onwards. The women were all taking part in the Million Women Study.

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They were quizzed about how old they were when they had their first and last periods, how many children they had given birth to, and whether they had used oral contraceptives and hormone replacement therapy (HRT).

On average, they were monitored for six years, to see whether they were admitted to hospital for a knee or hip replacement for the inflammatory joint disease, osteoarthritis.
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During this period, more than 12,000 of them needed a hip replacement and just under 10,000 a knee replacement.

Starting menstruation at or before the age of 11 boosted the probability of both types of surgery by between 9% and 15%.

Every successive birth also increased the risk of a hip replacement by 2%, and that of a knee replacement by 8%.

And although previous use of oral contraceptives did not affect the risk of joint surgery, current use of HRT boosted the chances of a hip replacement by 38% and of a knee replacement by 58% compared with those who had never used HRT.

However, better use of health services by women on HRT may explain this link, caution the authors.

Osteoarthritis, particularly of the knee, is more common among women than it is among men.

And the findings from this study suggest that female sex hormones, particularly oestrogen may help explain some of this difference.

Source: BMJ
LIN/SK
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