ultrasound image, vastus medialis, active motion of knee extension, short axis image

ePT
When the knee joint is extended, the vastus intermedius and prefemoral fat pad increase in thickness. The vastus medialis moves to the center, but the vastus medialis does not move as fast as the vastus lateralis.

Clinical application
When physical therapist evaluates, it evaluates whether the vastus intermedius and the prefemoral fat pad are moving in the vertical direction. If this movement is bad, it is necessary to improve the flexibility in the vertical direction.

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