On he capers, knock-kneed, curly-shoed, spindly-legged in awful black tights, like something out of the Beano!

ECONOMIST: Ali Bongo

Her dancing was all the more extraordinary because, as a child, she had been so knock-kneed and flat-footed that doctors predicted she would spend her life in leg-irons.

ECONOMIST: Obituary

She became completely knock-kneed.

BBC: CJD: Anguish of a victim's family