For reasons related to pregnancy, women are proportionally more men than in the basin. The angle between the line that extends from the hip to the knee center (kneecap) and the line from the center of the knee to the tibia is quadriceps angle or angle Q. In the literature, the average value of the reference of this angle 11 degrees to 14 degrees for men and women.

The relationship between the pelvis and knee in women, the causes of the differences in sport biomechanics prone women to the ground with his foot a little more outward-oriented attack, what to intense internal rotation. This increase in the unstable pronated could increase the risk of injury. Some manufacturers have taken into account these differences in the biomechanics. The most important implications for design of the boot unit includes dual-density, a rounded heel and an absorbent material to a viscoelastic put in order, to delay the initial rotation of the female feet after the initial contact with the ground.

The cycle of ovulation

In addition to structural and anatomical differences between the sexes, there are also hormonal differences. Intuitively, many athletes sports injuries related to their periods of fertility.

End of 2000, the researchers showed that during the presence of the Summit of estrogen in the body (which features as a muscle relaxant), the plantar fascia is affected, more elastic, which influences the biomechanical behavior called "wind mechanism". The arch will flatten and increase the rate of the medium-lateral knee acceleration, a factor that some researchers suspect, may be associated with the development of some lesions.

Given these cyclical changes in the biomechanics, launched some sports footwear models with deformable materials used in the interior that can meet the anatomical differences of the plantar arch caused by these cycles. In addition, some female role models, the relationship between the heel and forefoot higher (over-range), what the likelihood of certain injuries that are suspected of connection to the rotation of the knee can be reduced.