Structured Examination Approach

For Medical Students

What It Tests

A structured examination tests the whole knee in a fixed order, which matters because the alternative is testing whatever the history suggested and missing everything it did not.

The structure has a second purpose. A fixed sequence produces a record that another clinician can compare against, and a knee that is examined the same way twice can be said to have changed. 4.1.8 covers the record.

The order is look, feel, move, then test, and each stage changes how the next one is done.

How It Is Performed

Begin with the patient walking in, because gait is the only part of the examination that is unguarded. 4.3.2 covers it.

Then standing: alignment from in front, from the side and from behind, and ask for a single leg stand if the history suggests it. 4.3.3 covers standing alignment.

Then supine with both legs exposed: inspect for wasting, scars, swelling and the position of rest.

Then palpate systematically, starting away from the painful area and working towards it. 4.6.1 covers the sequence.

Then range of motion, active before passive, since active tells you what the patient will do and passive what the knee will allow. 4.7.1 and 4.7.2 cover both.

Then effusion, which is quick and changes the interpretation of everything after it. 4.8.3 covers the bulge sign.

Then the special tests, grouped by structure and ordered least to most provocative.

Finish with the hip, the ankle and the neurovascular status.

What a Positive Means

In a structured examination a positive finding has a defined place, which is what makes it interpretable.

Tenderness found during systematic palpation of a relaxed knee means more than tenderness elicited during a provocative test, because the second could be the test rather than the structure.

A limited active range with a full passive range points to the muscle or to pain inhibition rather than to a mechanical block. 4.7.8 covers extension lag.

And a finding that appears only after several provocative tests is suspect, because by then the knee is sore.

MRCS Level

How It Is Performed

In a viva or an OSCE the sequence is the mark scheme, and candidates lose marks for omissions rather than for technique.

The omissions that cost most are the other knee, the hip, and the statement of what you would do next.

Narrate throughout. Say what you are inspecting for, what you are palpating, and what a test would show if positive.

Where a test is uncomfortable, say that you would normally warn the patient, and then warn them. Examiners mark this and patients remember it.

How Good It Is

A structured examination performs better than a targeted one for a reason that is mechanical rather than diligent.

Knee pathology is frequently combined. A patient with an obvious cruciate injury has a meaningful chance of a meniscal or a collateral injury alongside it, and a targeted examination that confirms the obvious one stops there.

The structured version also produces a baseline. The value of a recorded normal hip examination is not in this consultation but in the next one.

Against that, a full examination takes longer and a rushed full examination performs worse than a careful partial one, which is a real tension rather than a counsel of perfection.

FRCS Level

How Good It Is

At this level the structure is adapted rather than followed, and knowing when to adapt it is the skill.

In an acute knee the sequence is compressed, because the patient will not tolerate the full version and the information available is limited anyway. The decisions that matter are whether there is a haemarthrosis, whether the extensor mechanism is intact, and whether the knee is dislocatable.

In a chronic knee the full sequence is worth the time, because the findings are subtle and the decision is elective.

In a post-operative knee the sequence changes order: range of motion and extensor function come before laxity, because they are the findings that most often need acting on. 4.20.1 covers the reconstructed knee.

The vascular assessment moves to first place in a knee dislocation, and that reordering is not a refinement.

Where It Misleads

A structured examination misleads when the structure substitutes for thinking.

A complete examination recorded as normal in a patient with a clear mechanical history is more likely to be an incomplete examination than a normal knee.

The sequence can also produce false reassurance through repetition. A clinician who has performed the same examination a thousand times stops seeing the standing inspection, which is the stage that carries alignment and wasting.

And the structure does not cover rotational instability adequately. The tests that detect it are provocative, come last, and are least likely to be performed in a sore knee, which is why rotational laxity is the commonest thing missed. 4.14.5 covers the patterns.

Fellowship Level

Where It Misleads

In referred and revision practice the structured examination has a different job: it is checking a previous examination rather than performing a first one.

That means doing the parts the referring assessment is most likely to have skipped, which in practice are rotation at two flexion angles, the hip, and the contralateral knee.

It also means examining under the conditions the previous examiner did not have. An examination under anaesthetic is a different instrument rather than a more careful version of the same one, and in a multiligament or a revision knee it is often the one that settles the question. 4.14.6 covers it.

The judgement is when the answer is worth an anaesthetic, and the structure does not contain that judgement. A patient whose management will not change on the result does not need one, and a patient in whom a reconstruction plan turns on a rotational grade probably does.