The medical term for knock knees is 'genu valgum' - genu meaning 'knee' in Latin, and valgum meaning 'bending outwards'. In knock knees, if the knees touch it is the lower leg which seems bent outwards. So if you have knock knees you are unable to stand with your knees AND your ankles together.
This is a companion discussion topic for the original article at https://patient.info/bones-joints-muscles/knock-knees