Ruff et al developed equations for estimating body mass in adults from the diameter of the femoral head.
Parameters:
(1) gender
(2) diameter of the femoral head, anterior to posterior, in millimeters
estimated body mass in kilograms for a male =
= ((2.741 * (diameter of the femoral head)) - 54.9) * 0.9 =
= (2.467 * (diameter of the femoral head) - 49.4
estimated body mass in kilograms for a female =
= ((2.426 * (diameter of the femoral head)) - 35.1) * 0.9 =
= (2.183 * (diameter of the femoral head) - 31.6
where:
• The 0.9 reflects a 10% downward correction factor.
