Understanding the Slocum Test (Anterolateral Rotatory Instability) Assessment
To assess for **anterolateral rotatory instability** and the function of the **Anterolateral Ligament** (a dynamic variant of the Anterior Drawer).
Watch How It's Done
How do I start?
Patient is supine. Knee is flexed to 90°. Foot is stabilized by the examiner sitting on it.
What happens?
The foot is placed in **30° of internal rotation**. The examiner then performs a strong **Anterior Drawer Test** (pulling the tibia forward).
In Plain English
What Does a Positive Result Mean?
Excessive anterior translation of the **lateral tibial plateau** (the outside part of the tibia) compared to the medial side, or a 'soft' endpoint.
Helpful Tip:
Internal rotation of the foot tightens the lateral knee structures (LCL, ITB), isolating the strain to the ACL and anterolateral structures.
Safety First
This guide is to help you understand what happens in a clinic. Do not try to diagnose yourself. If you have severe pain, swelling, or cannot put weight on your leg, please visit an urgent care center or your doctor immediately.
Other Knee Tests
Pivot Shift Test
To dynamically assess for **anterolateral rotatory instability** of the knee, which is highly indicative of a **complete ACL tear**.
Posterior Drawer Test of the Knee
To assess the integrity of the **Posterior Cruciate Ligament (PCL)**.
Posterior Sag Sign (Gravity Drawer Test)
To detect a rupture of the **Posterior Cruciate Ligament (PCL)** by observing the effect of gravity.
Thessaly Test
To assess for **meniscal tears** by dynamically loading the meniscus in a weight-bearing, rotational manner.