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T? th? x?u, ch?ng h?n nh? khom l?ng hay cong l?ng c?ng có th? khi?n ng?c b? tác ??ng b?i tr?ng l?c nhi?u h?n.Ch? nh?ng tr??ng h?p ng?c b? tr? ? m?c ?? n?ng nh?t ho?c b? phì ??i thì m?i c?n ph?i c?t b? nh?ng ph?n da th?a và ???ng s?o s? kéo dài t? ??u ng?c t?i chân ng?c.B??c three: ?o v? th?m m? Bác s? ti?n hành ?o v? th?m m? ?? xác ??nh