Reverse Pivot Shift, Lateral Knee Examination

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Reverse Pivot Shift

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For Medical Students

What It Tests

The reverse pivot shift detects the lateral tibial plateau subluxing posteriorly in flexion and reducing as the knee extends.

The mechanism and the technique are described in the posterior cruciate chapter, because that is where the test is usually first met. 4.11.4 covers both.

What this page covers is what the test says about the lateral side. A positive result requires the posterolateral corner to be deficient, so the test is a corner finding before it is a cruciate one. 3.10.6 covers the corner.

How It Is Performed

Flex the knee to about seventy degrees with the patient relaxed, hold the foot, apply a valgus force and hold the tibia in external rotation.

Extend the knee slowly while keeping both forces applied, and feel for the lateral plateau reducing as the knee passes about twenty to thirty degrees.

Compare with the other knee using the same hands and the same forces.

Perform the dial test at thirty and ninety degrees in the same sitting, because that is the test the corner diagnosis will actually rest on. 4.13.5 covers it.

Perform varus stress and palpate the collateral ligament, so the corner assessment is complete rather than resting on one rotational test. 4.13.4 covers the sequence.

What a Positive Means

A palpable shift as the lateral plateau reduces indicates that the lateral side of the tibia was subluxed posteriorly, which needs the corner to be deficient.

It also needs the posterior cruciate to be deficient in most descriptions, which is why the test cannot distinguish a corner injury from a combined one. 4.11.2 covers the drawer.

A positive result in a knee with a normal dial test should be distrusted, since the dial test is the more reliable reading of the same structures. 4.13.5 covers it.

A positive result occurs in a proportion of normal relaxed knees, so an uncompared positive is close to meaningless. 4.23.3 covers hypermobile patients.

Key Learning Points

A positive result requires the posterolateral corner to be deficient, so it is a corner finding first.
It also requires the posterior cruciate in most descriptions, so it cannot separate the two.
The dial test is the more reliable reading of the same structures.
A positive result with a normal dial test should be distrusted.
A positive result occurs in a proportion of normal relaxed knees.

MRCS Level

How It Is Performed

In a viva this test is worth naming and not worth leading with, because the expected answer to how you assess the corner is the dial test. 4.13.5 covers it.

The expected points are the starting flexion, the valgus force, the external rotation, the slow extension, the angle at which the shift occurs, and the comparison.

Say which direction the shift goes, because confusing it with the pivot shift is the commonest error and it appears in correspondence. 4.14.1 covers the forward version.

Say that the iliotibial band supplies the reducing force as its line of pull crosses the axis of rotation near extension. 3.11.1 covers its function.

Say that you would not rely on it, and say why, because knowing a test's limitations is what the question is testing. 4.11.4 covers the mechanism in full.

What a Positive Means

The reasoning expected is that the corner resists external rotation of the tibia, so its loss permits the lateral plateau to rotate and translate posteriorly under a valgus load. 3.10.2 covers external rotation stability.

The posterior cruciate resists the posterior component of that movement, which is why the finding is a two structure one. 3.10.9 covers the combination.

The popliteus complex is the part of the corner whose loss matters most here, and it is also the part the varus test cannot see, which is why a knee with a normal varus test can have a positive reverse pivot shift. 4.13.3 covers it.

A positive test with increased external rotation at thirty degrees only indicates the corner without the cruciate, and the dial test rather than this test is what establishes that. 4.13.5 covers the pattern.

How Good It Is

The reverse pivot shift is specific for a combined posterior and posterolateral injury when it is clearly asymmetric, and unreliable in every other circumstance.

It is less reproducible than the dial test, and the dial test gives the localisation this test cannot, so the dial test has displaced it for this question in most practice. 4.13.5 covers it.

Its rate of positive results in normal knees rises under anaesthesia, which is the setting in which an examiner is most tempted to rely on it. 4.14.6 covers examination under anaesthesia.

It remains worth performing, because it is quick and because an unmistakable asymmetric shift in a knee whose dial test was equivocal is a useful piece of corroboration.

No figures appear for any accuracy comparison on this page, under decision 023, and the comparison is the claim being made.

Key Learning Points

Specific when clearly asymmetric and unreliable otherwise.
Less reproducible than the dial test, which also gives localisation it cannot.
Positive results in normal knees rise under anaesthesia.
The popliteus complex is the part of the corner whose loss matters most here.
It is worth performing as corroboration when the dial test is equivocal.

FRCS Level

How Good It Is

At decision level this test does not make a decision and it does prevent one being made wrongly.

A clearly positive asymmetric shift in a knee listed for an isolated posterior cruciate reconstruction is a reason to stop and assess the corner properly, and that is the test's whole contribution. 4.13.4 covers that assessment.

Beyond that, every decision on this side of the knee rests on the dial test at two angles, the varus grade, the stress radiographs and the alignment. 4.13.5 covers the first of those.

The test has a place in the examination under anaesthesia of a multiligament knee, performed on both sides, where an asymmetric result adds to a picture being built from several findings. 4.11.7 covers that sequence.

It has no role in following a reconstruction, because a reconstructed corner alters the mechanism the test depends on.

Where It Misleads

The commonest error is reading an isolated positive result as pathology without comparing sides.

The second is performing it on a guarding patient, where a negative result means the hamstrings worked.

The third is describing it in the direction of the pivot shift.

The fourth is treating a positive result as localising to the corner. It needs two structures, so it localises to neither on its own.

The fifth is using it to follow a reconstructed knee, where the result is uninterpretable.

Key Learning Points

The test prevents a wrong decision rather than making a right one.
A clear asymmetric shift in a knee listed for isolated cruciate reconstruction is a reason to stop.
Every decision on this side rests on the dial test, the varus grade, the radiographs and the alignment.
It needs two structures, so it localises to neither on its own.
It has no role in following a reconstruction.

Fellowship Level

Where It Misleads

In revision practice this test is usually positive in a knee where it should have been positive years earlier, and the question is what to do now rather than what it means.

A knee with a fixed posterior subluxation cannot shift, so the most deficient knees give the most reassuring result, and that is the trap this test shares with the posterior drawer. 4.11.6 covers that knee.

A knee with a previous lateral extra-articular procedure or a tenodesis no longer has the iliotibial band mechanism the test depends on, so a negative result says nothing. 3.11.7 covers the procedure.

A knee with a reconstructed corner that is over constrained gives a negative test and a stiff lateral side, and the stiffness rather than the test is the finding. 4.2.4 covers stiffness.

In a hypermobile patient the test is positive on both sides and contributes nothing, which is worth establishing before building any argument on it. 4.23.3 covers those patients.

In medicolegal work the test is too unreliable to carry an opinion, and the dial test with a recorded comparison is what should. 4.23.7 covers that setting.

Key Learning Points

A fixed posterior subluxation cannot shift, so the most deficient knees read as reassuring.
A previous tenodesis removes the mechanism, so a negative result says nothing.
An over constrained corner reconstruction gives a negative test and a stiff lateral side.
In a hypermobile patient the test is positive bilaterally and contributes nothing.
The test is too unreliable to carry a medicolegal opinion, and the dial test is not.

Explore Further

Where this topic came from and where it goes next in the spiral.

References

No reference list is attached to this draft. Evidence verification has not run, because source retrieval was unavailable at generation time. Under the Operations Handbook a missing reference is acceptable and an invented one is a critical failure, so nothing has been cited and no citation marker appears in the text. This page carries no diagnostic accuracy figure, which is decision 023 rather than an omission. The comparative standing of these tests is standard teaching and a specific sensitivity written from memory is the same class of claim as an invented citation, so ACC-001 refuses the number and the page states the comparison. A reviewer with the literature can add the figures into How Good It Is without restructuring the page, and chapter 3.17 lists the studies the figures would come from. Any measurement here, including a flexion angle, is written from standard teaching, has not been checked, and is registered under decision 006 in pipeline/config/figures with a verification state of UNVERIFIED_FROM_MEMORY.

Safety. KneeSchool is educational and does not give individual medical advice. Seek urgent assessment for a knee that cannot bear weight after an injury, a hot swollen knee with a fever, or new numbness, weakness or coldness in the leg or foot.