Genu recurvatum, is a condition where the knee hyperextends and causes the knees to look like it is bending backwards when standing. This posture of the knee is easily identified when looking at a person from the side.
Genu recurvatum is also known as congenital dislocation of the patella (CDP), congenital dislocation of the knee (CDK) or sometimes as congenital hyerpextension. It is a rare condition and affects 1 in 100, 000 live births.
Reference:
http://www.medicalbag.com/profile-in-rare-diseases/congenital-genu-recurvatum/article/472305/
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