Femoral neck dimensions are unlikely to be associated with age at menarche

Hip axis length (HAL) has been reported as an independent risk factor for h ip fracture. Later puberty may increase bone size because of delayed epiphy seal fusion. We sought to identify associations between bone size at the pr oximal femur with age at menarche and other indices of growth such as statu re. Femoral neck dimensions were measured from dual-energy X-ray absorptiom etry scans of the proximal femur in a random sample of 203 premenopausal Ca ucasian women (age 20-30 years). There were no associations between age at menarche and HAL, femoral axis length (FAL) or femoral neck width (FNW). Ag e at menarche was associated with height (r = 0.2, p = 0.02). Variations in HAL, FAL and FNW do not appear to be related to age at menarche.