Understanding the Moving Patellar Apprehension Test Assessment
To assess for **Patellofemoral Instability** (e.g., subluxation or dislocation) and chronic lateral patellar hypermobility.
Watch How It's Done
How do I start?
Patient is supine. Knee is positioned in 20° of flexion (the position of typical instability).
What happens?
The examiner slowly and firmly attempts to **translate (push)** the patella **laterally**. This is done while the knee is slowly and carefully moved from flexion to extension.
In Plain English
What Does a Positive Result Mean?
The patient exhibits a strong **quadriceps contraction, verbal apprehension, or fear of dislocation** when the patella is pushed laterally, especially in the 20° to 30° flexion range.
Helpful Tip:
The test must elicit a fear response, not just pain, to be considered positive for instability.
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.
Slocum Test (Anterolateral Rotatory Instability)
To assess for **anterolateral rotatory instability** and the function of the **Anterolateral Ligament** (a dynamic variant of the Anterior Drawer).