Fifty women over 65 who had never suffered from knee problems had a frontal teleradiography of the lower limbs in a vertical standing position. Two knees (out of one hundred) were affected by an external femoro-tibial arthrosis. The femoro-tibial angle of the knees without arthrosis was very close to 0 (0.02). The typical difference was 2.46. The normal level is thus approximately -5 to +5 degrees, and there was thus no "physiological" genu-valgum in the population studied. Marginal osteophytosis and the tibial spines is very frequent and has no pathological significance. A menischondrocalcinosis was found in 14 per cent of subjects.