10Absolute and Relative Contraindications

FWhat a contraindication actually means here

Ossiculoplasty is an elective, quality-of-life operation. Unlike the removal of a cholesteatoma, no one is harmed by not rebuilding an ossicular chain, and a well-fitted hearing aid is always an alternative. That single fact reshapes the whole conversation about contraindications: because the downside of declining surgery is modest, the threshold for proceeding should be correspondingly high, and any factor that meaningfully tips the risk–benefit balance deserves serious weight.

It helps to separate two kinds of barrier. An absolute contraindicationis a setting in which reconstruction cannot succeed or is unsafe, so it should not be attempted at that sitting at all — an actively infected, discharging ear, or a dead ear with no cochlear reserve to drive. A relative contraindication is a factor that worsens the odds or the safety margin but does not forbid surgery: it counsels delay, a stagedapproach, modified technique, or simply more honest consent. Most of the difficult judgement in patient selection lives in this relative zone, and the published risk indices — MERI, SPITE, OOPS and the newer Ear Environment Risk scale — are essentially structured catalogues of these relative factors [1994, 1992, 2001, 2025].

Crucially, almost every contraindication to ossiculoplasty is about the environment and the timing, not the ossicles. The defect in the chain is the easy part; whether the ear is dry, aerated, disease-free and hearing-capable is what actually decides success. The matrix below sorts the common barriers into absolute and relative columns to anchor the rest of this module.

FAbsolute contraindications

Two situations are genuinely absolute in the sense that operating at that moment cannot help and may harm.

The first is active middle-ear infection. A persistently discharging ear — otorrhoea, granulation tissue, oedematous inflamed mucosa — is a hostile biological environment for any implanted prosthesis. Inflammation drives graft failure, prosthesis extrusion, adhesion and fibrosis, and audits of long-term failure repeatedly trace poor results back to unresolved or recurrent disease rather than to the choice of prosthesis [2006]. The rule is simple: render the ear dry and quiescent first. Conventional practice is to wait until the ear has been free of discharge, ideally for some weeks to months, before reconstructing. Drainage is so dominant a predictor that Bellucci built his classic tympanoplasty grading around it, and Black’s SPITE analysis placed Infection among the strongest determinants of a poor outcome [1973, 1992].

The second is a dead ear— an ear with no measurable bone-conduction thresholds and therefore no usable cochlear reserve. Ossiculoplasty only ever restores the conductive mechanism: it delivers sound more efficiently to the cochlea, but it cannot generate hearing where the inner ear has failed. With a non-functioning cochlea there is nothing for the rebuilt chain to drive, so reconstruction offers no acoustic benefit while still carrying the surgical risks of the approach. A dead ear is therefore an absolute bar to ossiculoplasty in that ear; the appropriate options are observation, disease control if needed, or a cochlear or bone-conduction implant where indicated, not a prosthesis across the middle ear.

A useful way to think about it: infection is a contraindication of timing— it lifts once the ear is dry — whereas a dead ear is a contraindication of physiology, which will not change. The rest of the barriers fall between these two poles.

TRelative contraindications and the environment

The relative contraindications are the working surgeon’s everyday territory. None forbids surgery outright, but each lowers the chance of a good result and may shift the plan toward staging, modification or candid de-escalation of expectations.

• Cholesteatoma and active mucosal disease. Disease eradication and a healthy, aerated middle ear take precedence over hearing restoration. In a cholesteatomatous or granulating ear the standard approach is to clear disease first and stagethe ossiculoplasty, reconstructing only once the ear is dry and the mucosa has recovered — which also preserves a clean second-look for residual disease [2006].
• Severe eustachian-tube dysfunction and atelectasis. A ventilated middle-ear cleft is a mechanical prerequisite. In a grossly atelectatic, poorly aerated ear a prosthesis is compressed, displaced or re-retracted; ventilation should be improved or reconstruction staged, and cartilage reinforcement considered. Eustachian failure is consistently among the strongest predictors of failure across risk scores [1992, 1994].
• Extensive tympanosclerosis or middle-ear fibrosis. Dense sclerotic plaques and fibrous obliteration impair mucosal regeneration, tether the reconstruction and predispose to re-fixation or extrusion. Where clearance leaves large denuded areas of bone it may be wiser to delay until a mucosal lining returns, or to interpose cartilage to reduce extrusion.
• A fixed stapes footplate. A mobile footplate is essential; a prosthesis placed onto a fixed footplate transmits nothing and will not close the gap. A fixed footplate is not an absolute bar to all surgery, but it means the operation has to change — a stapedotomy or stapedectomy must be planned — rather than a conventional ossiculoplasty proceeding over an immobile platform.
• Canal-wall-down cavities and revision ears.Reconstruction is feasible in an open, well-epithelialised cavity, but a wet, shallow or unstable cavity reduces middle-ear volume, raises infection exposure and compromises round-window protection, all of which worsen results. The multicentre Ear Environment Risk data quantify exactly this: revision status and canal-wall-down anatomy widen the postoperative air–bone gap, and a lateralised or blunted drum is among the heaviest penalties of all [2025].
• Uncontrolled systemic illness and the unfit patient. Poorly controlled diabetes, immunodeficiency, coagulopathy or active chemotherapy impair wound healing and raise infection risk; these are relative contraindications until optimised. So, pragmatically, is the patient who cannot tolerate general anaesthesia or will not keep water precautions and follow-up — for an elective hearing operation, that tips the balance toward amplification.

Read together, these factors describe the same underlying truth the risk indices capture: it is the quality of the ear and the host, far more than the ossicular gap, that determines whether a reconstruction survives and works. The chart below shows how the modern Ear Environment Risk factors translate into measurable widening of the residual gap.

TCochlear reserve and the only-hearing ear

Because ossiculoplasty rehabilitates the conductive pathway alone, the cochlear reserve— read from the bone-conduction thresholds — sets a ceiling on what surgery can achieve. The most optimistic outcome is closure of the air–bone gap; the resulting hearing can never be better than the bone line. This has two practical consequences for selection. Where bone-conduction thresholds are poor, gap closure may still leave the patient short of useful hearing, so the realistic target must be discussed honestly. And where the cochlea is dead, as above, there is no reserve at all and reconstruction is futile. The slider below makes this ceiling explicit: move the cochlear reserve and watch the best achievable hearing track it, no matter how perfectly the gap is closed.

The hardest version of this judgement is the only-hearing ear— an ear whose fellow is dead or profoundly impaired. Here the conductive defect may be entirely correctable and the reserve good, yet the catastrophic consequence of any sensorineural injury changes everything. An only-hearing ear is one of the strongest relative contraindications in otology: many surgeons will counsel strongly toward amplification, and where surgery is offered it demands meticulous, explicit consent and is reserved for clear indications such as a destructive or repeatedly infected ear rather than purely elective gain. The published only-hearing-ear experience emphasises exactly this priority — control disease, offer hearing aids and bone-conduction or cochlear devices, and treat hearing-restoration surgery in such ears with great caution [2014].

CDelay, stage, or decline: putting it together

In practice the contraindications resolve into three decisions rather than a simple yes or no. Delay applies to the reversible barriers: an actively infected or wet ear is treated, dried and re-assessed before any prosthesis is considered, because operating into inflammation is the single most reliable way to manufacture a failure [2006]. Stageapplies where the disease can be cleared but the environment is not yet fit — cholesteatoma, denuded or fibrotic mucosa, a collapsed unventilated cleft. Here disease control comes first and the ossiculoplasty is deferred to a planned second sitting, which both improves the mechanical setting and allows a second-look for residual disease. The risk indices are most valuable precisely as staging tools: a high-risk ear is the one for which you reconstruct in two steps and temper the hearing target [1994, 2001].

Decline— or, more accurately, redirect — is the right answer when reconstruction cannot help or the balance of risk is wrong: a dead ear with no reserve, a footplate fixation that mandates a different operation, a poor cochlear reserve where the achievable hearing does not justify the risk, or an only-hearing ear in which amplification is plainly the safer rehabilitation. Declining ossiculoplasty is never the same as declining help: the hearing aid, the bone-conduction device and the cochlear implant all remain on the table, and offering them is part of good selection, not a failure of it [2014].

Finally, a word on honesty. The risk scales do not refuse an operation; they quantify how guarded the result is likely to be and force a realistic conversation [2025]. The contraindications in this module are best understood the same way — not as a list of prohibitions to memorise, but as the structured reasons to pause, to sequence the surgery sensibly, and to make sure the patient understands what an elective conductive operation can and cannot do for the ear in front of you.