In a population-based study we identified a cohort of 282 women, whose children had been treated for osteoarthritis of the hip. The incidence of hip fracture in these mothers was 0.54 (95% CI 0.35 to 0.83) of that in the whole population of their age and sex. This finding could be explained by a genetic factor for increased rigidity of subchondral bone, making osteoarthritis more likely and osteoporosis less likely.
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Åström et al. (1992) studied this question.