Previous Surgery

The same topic at 4 depths

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For Medical Students

What It Tests

Asking about previous surgery tests what has already been altered, because a knee that has been operated on is a different knee.

It also tests what worked, which is information no imaging can supply and which predicts what will work next.

And it tests what the patient believes was done, which is frequently different from what was done.

How It Is Performed

Ask what operations, on which knee, and in what order.

Ask when each one was, in years, and what each one was for.

Ask what happened afterwards: whether the symptom went, how long for, and whether something different came back.

Ask what they were told was found, accepting that this is their recollection of a conversation rather than an operation note.

Ask to see the scars and count them against the account, because the scars are the one part of the surgical history that cannot be misremembered. 4.3.7 covers surgical scars.

Then obtain the operation notes, because this history is a guide to what to look for in them rather than a substitute.

What a Positive Means

A symptom that never improved after an operation suggests the operation addressed the wrong thing.

A symptom that improved and returned suggests either a new problem or a recurrence, and the interval distinguishes them.

A new and different symptom after an operation points at the operation.

Multiple operations with diminishing benefit is a recognisable pattern and a reason for caution rather than for another procedure. 4.23.5 covers revision patients.

Key Learning Points

A knee that has been operated on is a different knee.
What worked is information no imaging can supply.
Count the scars against the account, because scars cannot be misremembered.
A symptom that never improved suggests the operation addressed the wrong thing.
Multiple operations with diminishing benefit is a reason for caution.

MRCS Level

What a Positive Means

The expected reasoning is that each operation changes the mechanics and therefore the differential.

A previous meniscectomy leaves a knee with less load distribution and a higher risk of degenerative change, and a new symptom in that knee is interpreted differently. 4.9.10 covers deficiency.

A previous reconstruction means the graft, its tunnels and its fixation are all possible sources of symptoms. 4.20.1 covers the assessment.

A previous osteotomy or arthroplasty changes the alignment and the articulation and the symptoms that follow are specific to it. 4.20.4 and 4.20.8 cover both.

A previous operation for infection, however long ago, changes the interpretation of every subsequent swollen or painful episode.

How Good It Is

The surgical history performs well for what to look for and badly for what was actually done, because patient recall of operative detail is poor and should not be relied upon.

The dates are reasonably recalled and the sequence usually is.

The outcome of each operation is well recalled, and this is the part of the history worth most, because it is both reliable and unavailable elsewhere.

Obtaining the notes is not optional in a revision assessment, and the history's job is to tell you what to read them for.

Key Learning Points

Each operation changes the mechanics and therefore the differential.
Patient recall of operative detail is poor; recall of outcome is good.
The outcome of each operation is the most valuable part of this history.
A previous operation for infection changes every subsequent swollen episode.
Obtaining the notes is not optional, and the history says what to read them for.

FRCS Level

How Good It Is

At decision level the surgical history determines feasibility as much as diagnosis.

Tunnel position and fixation from a previous reconstruction determine whether a revision is single stage or two stage, and the notes and imaging settle it while the history identifies that the question exists. 4.10.12 covers revision assessment.

Previous meniscal resection determines whether a meniscal transplant is even a consideration.

Previous infection determines the whole approach to any further implant.

And the pattern of response to previous surgery is among the better predictors of response to the next one, which is a reason to take it seriously rather than as background.

Where It Misleads

The commonest error is accepting the referral letter's summary of previous surgery, which is usually a summary of a summary.

The second is accepting the patient's term for the operation. A washout, a clean up, a repair and a trim are not reliable descriptions and each covers several procedures.

The third is missing an operation entirely, which the scar count catches. 4.3.7 covers scars.

And attributing all current symptoms to the most recent operation, when an earlier one changed the mechanics more.

Key Learning Points

The surgical history determines feasibility as much as diagnosis.
Response to previous surgery predicts response to the next.
A washout, a clean up, a repair and a trim are not reliable descriptions.
The scar count catches an operation the history missed.
The most recent operation is not always the one that changed the mechanics most.

Fellowship Level

Where It Misleads

In referred practice this is the most important page in the chapter, because the surgical history is the assessment.

The task is a timeline: every operation, its date, its indication, its finding, and the symptom state before and after it. Building that timeline is usually the single most useful thing the consultation produces. 4.23.5 covers revision patients.

A timeline reveals the pattern that individual notes do not: a knee that has been operated on repeatedly for the same symptom with brief or no benefit is telling you the diagnosis was wrong rather than the operations were.

It also reveals the interval that matters. A symptom returning at six weeks, six months and six years after a reconstruction have different causes.

And it identifies what cannot be undone, which bounds everything that follows.

No figure here supports these claims, under decision 023.

Key Learning Points

In revision practice the surgical history is the assessment.
Build a timeline: operation, date, indication, finding, and symptom before and after.
Repeated operations for the same symptom with brief benefit means the diagnosis was wrong.
A symptom returning at six weeks, six months and six years has different causes.
The timeline identifies what cannot be undone, which bounds everything that follows.

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 either, which is decision 023 rather than an omission: the comparative value of the history questions is standard teaching and a specific sensitivity written from memory is not, so ACC-001 refuses the number and the page states the comparison. Any measurement on this page is written from standard teaching, has not been checked against a source, 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.