Apley's Compression-Rotation Test: How to Detect Knee Meniscus Injuries

When someone comes in with pain along the knee joint line after a twisting movement or a blow, one of the first questions you ask yourself is: is this a meniscus issue or something ligamentous? Apley's test (or Apley's grinding test) is one of the classic maneuvers used to start answering that question, combining compression and rotation of the tibia against the femur.

What does this test measure?

Apley's test aims to reproduce pain or locking by compressing the menisci between the femoral condyles and the tibial plateaus while rotating the tibia. It also includes a distraction (traction) phase, which helps differentiate a meniscal cause of pain from a ligamentous or capsular one.

The logic is simple: if compression plus rotation causes pain, you suspect the meniscus; if you do the same thing but with traction (separating the joint surfaces) and the pain disappears or changes, that strengthens the suspicion.

Equipment needed

• Treatment table
• No additional tools required (purely a manual test)

Test protocol

1. The patient lies face down (prone) on the table, with the knee being assessed flexed to 90°
2. Compression phase: stabilize the thigh with one hand or your own body weight, and with the other hand grip the foot/ankle. Apply downward axial pressure (compressing the knee) while internally and externally rotating the tibia
3. Watch for pain, clicking, or locking at any point during rotation, and note which compartment (medial or lateral) is affected
4. Distraction phase: without releasing the rotational pressure, now apply longitudinal traction to the limb (pulling toward you) while repeating internal and external rotation
5. Compare the responses from both phases

Common mistakes

• Not clearly distinguishing between the compression and distraction phases (the contrast between them is what gives the test its diagnostic value)
• Applying rotations too abruptly, which can cause pain from other structures (capsule, collateral ligaments)
• Not recording which compartment (medial/lateral) the pain occurs in

How to interpret the result

Result	Interpretation
Pain with compression + rotation that improves or disappears with distraction	Positive — suggests meniscal involvement (medial if pain occurs with external rotation, lateral if pain occurs with internal rotation)
Pain present during both compression and distraction	Suggests a ligamentous or capsular component, not purely meniscal
No pain in either phase	Negative

As with most meniscal pathology tests, Apley's test has limited sensitivity on its own. It's recommended to combine it with other meniscal maneuvers and, if clinical suspicion persists, refer for imaging (MRI).

Related tests

Apley's test is part of the classic meniscal examination battery, along with:

• McMurray Test — another compression-rotation maneuver, highly complementary
• Thessaly Test — a weight-bearing version, useful when table-based tests are inconclusive

Track it in your assessments

Meniscal injuries tend to evolve over time (they improve, worsen, or produce intermittent locking episodes). In Movalytics you can record the result of Apley's test alongside other knee tests at each assessment and track how the patient's response changes session by session — especially useful when following a conservative rehab program.

Frequently asked questions

Does Apley's test always hurt when there's a meniscus injury? Not necessarily. Its sensitivity is moderate, so a negative result doesn't fully rule out a meniscus injury, especially when there's clear clinical suspicion based on the patient's history. Can it be performed in the acute phase, right after the injury? With caution. In a very acute phase (significant inflammation or effusion) it can be hard to interpret and more uncomfortable for the patient, so it's sometimes better to wait until the initial inflammation subsides. What's the difference between medial and lateral pain in this test? Pain in the medial compartment during external rotation usually points to the medial meniscus, while lateral pain during internal rotation points to the lateral meniscus — though it should always be interpreted alongside the rest of the exam.