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¼ 0.101) than in the distal-height region. The medial and lateral cortical thickness for women with OA was greater than that for healthy women in the proximal-and central-height regions, respectively (medial-proximal, P ¼ 0.046; medial-central, P ¼ 0.01; lateral-proximal, P ¼ 0.058; lateral-central, P ¼ 0.01). The posterior cortical thickness for women with OA was smaller than that for healthy women in the proximal (P ¼ 0.054) and central-height regions (P ¼ 0.023) (Table 1) [Fig. 3, 4]. Conclusions: The medial and posterior regions of the femoral diaphysis of healthy elderly women were thicker in the proximal-to-central height regions, which may explain the mechanism of bowing. The thicker medial and lateral femoral cortical thickness in the proximal-to middle-height regions in knee OA, compared with those in healthy women, indicate remodeling by lateral bowing caused by varus OA malalignment in the knee. The posterior cortical femoral regions in knee OA thinner than healthy elderly women indicate decrease in the traction power of the linea aspera attached to the quadriceps muscles.

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