Anterolateral rotatory instability is an excessive internal rotation of the tibia on the femur when the knee is bent, leading to excessive opening of the joint at the outer (lateral ) side.

What is the significance of anterolateral rotatory instability?

This finding implies damage to the anterior cruciate also involving one or several other structures:

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Dr Sheila Strover (Editor)
BSc (Hons), MB BCh, MBA

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Journal interpretation -

The test for anterolateral rotatory instability is also called the 'Slocum Test'. Here is a video showing the Slocum test and embedded courtesy of 'HDAllDay21' -