One curiosity was that, statistically, the speed of movement of the right knee also appeared to be important in signalling dance quality.

ECONOMIST: Dancing and sexual selection: Lord of the dance | The

By the time the 1966 World Cup came around he was a pale imitation of the real Garrincha, a long-term knee injury enough to curb the electric bursts of speed that had once made him so destructive.

BBC: By Jonathan Stevenson

He hopes to be running full speed soon so he can see how the knee responds to the additional work.

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Bionic prostheses such as its "Rheo Knee" use artificial intelligence which adapts to the wearer's gait speed and their walking environment.

CNN: Powering prosthetics with thoughts alone