We evaluated the rotational alignment of the femoral component after total knee arthroplasty in 46 patients with distal femoral torsional deformity using a navigation-assisted gap technique.

A billion years ago, days lasted 19 hours: the balance between the oceans, the atmosphere, and the Moon slowed down the Earth ...

For nearly a billion years, Earth’s rotation stopped slowing down. Locked in a rare cosmic balance, the planet’s day remained ...

Before the start of any rotational movement in the golf swing, a golfer needs to get positioned into their setup stance over the ball. And to get into that proper setup position, you need to hinge ...

Every dazzling jump on the ice—like Yuzuru Hanyu's quadruple Lutz at the 2017 Grand Prix of Figure Skating in Moscow, Russia—requires a mastery of balance, rotational speed and angular momentum. Aflo ...