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Note what signs you see.
I (W. Wertelecki, M.D.) see a short stature individual with a relatively large cranium and a prominent forehead. The posture of his legs, and particular the right knee calls attention.
PERSPECTIVE: in medical parlance knee hyperextension backwards is called genu recurvatum. It is an expression of joint laxity. Knee extension should not exceed 10 degrees.
Please, see the gallery of images of this patient and further comments.