У азиаток выросших в западных странах ноги вполне прямые. Кривизна возникает от специфической позы при сидении, распространенной там, где постоянно сидят на полу, а не на стульях, т. наз. "W sitting position", вот такой вот:
"Biomechanics and orthopedic concerns. W-sitting requires the hips to be positioned in extreme internal rotation – way past what is functional. This causes problems with the hips and knees down the road. Major muscle groups become very tight, causing in-toeing during gait. Kids who chronically w-sit have more shallow hip sockets, which can cause problems down the road. W-sitting is also hard on the knee joint as this position causes excessive valgus (i.e. bad) forces on the joint. Try sitting in this position, and you’ll see what I mean.
Developmentally, a child who w-sits often has a weak core (the muscles in their trunk are weak). W-sitting utilizes their ligaments for stability, and is bad for their joints. Infants and kids who w-sit demonstrate decreased trunk rotation during play and are much less likely to reach across midline than their non w-sitting peers. This causes impaired functional postural control, balance, pelvic stability. It can also cause problems with the development of Fine Motor Skills and Coordination. Sitting in this position predisposes a child to stand and walk in this position (knock kneed and pigeon toed). It is not only awkward looking - it is biomechanically inefficient."
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Date: 2014-09-09 06:55 am (UTC)http://www.google.com.au/imgres?imgurl=http%3A%2F%2Fwww.raymondliumd.com%2Fimages%2FW%252520Sitting.jpg&imgrefurl=http%3A%2F%2Fwww.raymondliumd.com%2FConditions_Intoeing_Outtoeing.html&h=452&w=600&tbnid=aE4z5N_jzApJQM%3A&zoom=1&docid=JfwUdWBIlIvESM&ei=_6EOVIDfCcL_8QW_-oGYBw&tbm=isch&ved=0CE0QMygqMCo&iact=rc&uact=3&dur=999&page=3&start=28&ndsp=16
"Biomechanics and orthopedic concerns. W-sitting requires the hips to be positioned in extreme internal rotation – way past what is functional. This causes problems with the hips and knees down the road. Major muscle groups become very tight, causing in-toeing during gait. Kids who chronically w-sit have more shallow hip sockets, which can cause problems down the road. W-sitting is also hard on the knee joint as this position causes excessive valgus (i.e. bad) forces on the joint. Try sitting in this position, and you’ll see what I mean.
Developmentally, a child who w-sits often has a weak core (the muscles in their trunk are weak). W-sitting utilizes their ligaments for stability, and is bad for their joints. Infants and kids who w-sit demonstrate decreased trunk rotation during play and are much less likely to reach across midline than their non w-sitting peers. This causes impaired functional postural control, balance, pelvic stability. It can also cause problems with the development of Fine Motor Skills and Coordination. Sitting in this position predisposes a child to stand and walk in this position (knock kneed and pigeon toed). It is not only awkward looking - it is biomechanically inefficient."