Assisted passive extensions are knee rehabilitation exercises.
The assistant places a rolled-up towel under the knee and then helps to straighten the leg to increase extension.
The importance of regaining knee extension
The last few degrees of extension are important in allowing the knee to lock back when standing still in a relaxed position.
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See also -
Book - eCornerstones of Early Knee Rehabilitation
Easy-to-understand book filled with simple knee exercises.