End Feel

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Student MRCS FRCS Fellow

For Medical Students

What It Tests

End feel is what the examiner feels at the end of a passive movement: the character of the resistance rather than the angle at which it occurs.

It matters because the angle says how restricted a knee is and the end feel says why, and the why is what determines the treatment. 4.7.2 covers passive motion.

Four end feels are worth recognising: a firm abrupt stop, a springy rebound, a leathery stretch, and a limit reached because of pain before any resistance.

How It Is Performed

Move the knee passively to its limit with the patient relaxed and the limb supported, which is the only condition in which the end feel is interpretable. 4.7.2 covers the technique.

Apply a gentle steady pressure at the limit rather than a sudden force, and feel how the resistance behaves.

Note whether it stops abruptly, rebounds slightly, gives a little more with sustained pressure, or whether the patient stops you before resistance is reached.

Repeat on the other side and compare, since a normal end feel varies between people.

Record the end feel in words alongside the angle. 4.1.8 covers the record.

What a Positive Means

A firm abrupt stop indicates bone against bone or something interposed, which in a reconstructed knee raises an impinging lesion. 4.7.10 covers post-operative range.

A springy rebound indicates something displaced within the joint, which with a history of locking indicates a displaced meniscal tear. 4.9.8 covers mechanical locking.

A leathery stretch that gives slightly with sustained pressure indicates capsular or soft tissue shortening, which is a contracture. 4.7.7 covers it.

A limit reached because of pain, before resistance, indicates an irritable joint rather than a restricted one, usually an effusion or inflammation. 4.8.2 covers it.

An unusually soft end feel at the extremes suggests hypermobility rather than pathology, and the other knee settles it. 4.23.3 covers those patients.

Key Learning Points

End feel is the character of the resistance rather than the angle.
The angle says how restricted a knee is and the end feel says why.
A firm abrupt stop indicates bone or something interposed.
A springy rebound with a history of locking indicates a displaced meniscal tear.
A leathery stretch indicates capsular shortening, which is a contracture.

MRCS Level

How It Is Performed

In a viva the end feel is where a candidate shows they have examined stiff knees rather than read about them, and naming the four types is the mark.

The expected points are the relaxed supported limb, the gentle sustained pressure, the four characters, the comparison, and the record in words.

Say that a springy block with a locked knee is an urgent finding, since that combination is a displaced tear. 4.9.8 covers it.

Say that you would record the end feel in words rather than as a label, because the words survive and the label may be disputed. 4.1.8 covers the record.

Say that the end feel is the least reproducible part of the range assessment and the most informative, and that recording it anyway is the right answer.

What a Positive Means

The reasoning expected is that the resistance at a limit reflects the mechanical properties of whatever is reaching its limit, so bone, displaced tissue, shortened capsule and muscle guarding each feel different. 4.7.2 covers passive motion.

Bone and interposed fragments do not deform, which is why they produce an abrupt stop with no give. 4.9.8 covers one cause.

A displaced meniscal fragment is elastic, which is why it rebounds, and that elasticity is the physical basis of the springy block. 2.5.2 covers meniscal histology.

Capsular tissue is viscoelastic, which is why a contracture gives slightly under sustained pressure and why serial stretching can change it. 4.7.7 covers contractures.

How Good It Is

End feel is the most informative and least reproducible element of the range assessment, which is an uncomfortable combination and the honest position.

Its reproducibility improves with experience, which makes it a finding worth the same examiner recording across visits where possible.

Its value is that no other part of the examination distinguishes a mechanical block from a contracture, and that distinction changes the operation. 4.7.7 covers it.

Imaging identifies the structures and does not describe the resistance, so the two are complementary rather than competing. 4.1.6 covers that relationship.

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

Key Learning Points

The resistance reflects the mechanical properties of whatever reaches its limit.
Bone and fragments do not deform, so they stop abruptly.
A meniscal fragment is elastic, which is the physical basis of the springy block.
Capsular tissue is viscoelastic, so a contracture gives under sustained pressure.
No other part of the examination distinguishes a block from a contracture.

FRCS Level

How Good It Is

At decision level the end feel decides which operation a stiff knee needs, and no other finding does.

A firm abrupt block in a reconstructed knee indicates an impinging lesion, and the operation is an arthroscopic excision with a reliable result. 4.7.10 covers post-operative range.

A leathery global restriction indicates arthrofibrosis, and the operation is a release with a less certain result, so the distinction changes what the patient is told. 4.7.7 covers contractures.

A springy block with locking indicates a displaced tear, and the operation is urgent rather than elective. 4.9.8 covers mechanical locking.

A pain limited range indicates that the knee is irritable rather than stiff, and the treatment is the irritability. 4.8.2 covers the effusion.

Where It Misleads

The commonest error is recording an angle without an end feel, which leaves the cause undetermined.

The second is assessing the end feel in a guarding patient, where muscle guarding mimics every other character.

The third is applying a sudden force, which produces a stop rather than a character.

The fourth is treating a pain limited range as a contracture, which leads to releases that were not needed.

The fifth is relying on an end feel recorded by somebody else, since the finding is examiner dependent and the words are what survive.

Key Learning Points

The end feel decides which operation a stiff knee needs, and no other finding does.
A firm block in a reconstructed knee has a reliable arthroscopic answer.
A leathery restriction is arthrofibrosis, with a less certain result and a different conversation.
A springy block with locking is urgent rather than elective.
A pain limited range treated as a contracture leads to releases that were not needed.

Fellowship Level

Where It Misleads

In referred practice the end feel is often the finding that converts a vague stiffness referral into a specific plan.

A patient referred as stiff after a reconstruction, with a firm abrupt block, has an impinging lesion and a good prognosis, and the referral is frequently late because the end feel was never described. 4.7.10 covers the range.

A patient with a leathery global restriction has arthrofibrosis, and the honest conversation about a less certain outcome begins with this finding. 4.7.7 covers contractures.

A patient whose end feel changes between visits has a changing problem, and in a reconstructed knee a developing block is more concerning than a stable one.

A patient with a pain limited range and a normal passive range under anaesthesia has an irritable knee rather than a stiff one, and that is a diagnosis rather than an inconsistency. 4.14.6 covers that setting.

In medicolegal work an angle recorded without an end feel is a number whose cause cannot be established retrospectively, which weakens any opinion resting on it. 4.23.7 covers that setting.

Key Learning Points

The end feel converts a vague stiffness referral into a specific plan.
A firm abrupt block after reconstruction has a good prognosis and is often referred late.
A leathery restriction begins the honest conversation about arthrofibrosis.
A developing block between visits is more concerning than a stable one.
A pain limited range with a normal range under anaesthesia is an irritable knee, not a stiff one.

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.