13Remodeling and Repositioning Native Ossicular Remnants

FThe idea: reuse the bone you still have

Chronic ear disease rarely destroys the whole ossicular chain at once. It nibbles at the most vulnerable parts — the long process of the incus, the incudostapedial joint — while often sparing the bulky incus body, the malleus head and the malleus handle. The reconstructive surgeon who looks into the middle ear after clearing disease therefore faces a choice: reach for a manufactured prosthesis, or reuse the patient’s own surviving bone— reshaping it, repositioning it, or both — to rebuild the bridge between drum and stapes. This family of manoeuvres is what we mean by remodelling and repositioning native ossicular remnants.

The appeal is the same that has always favoured autograft: the bone is the patient’s own, so it provokes no foreign-body reaction, cannot be rejected, carries no disease-transmission risk, and costs nothing beyond operating time. It integrates quietly into the middle ear and, because it reconnects the native ossicles, it preserves much of the chain’s natural lever— the mechanical advantage the middle ear uses to match airborne sound into cochlear fluid. Where a full sculpted incus interposition is not possible, smaller salvage moves come into play: repositioning a malpositioned malleus into line with the stapes, or interposing the spared malleus head when the incus has gone entirely [1971].

FWhich remnant, which anchor: reading the chain

Every remodelling decision starts with the same two questions the Austin classification asks: is the malleus handle present, and is the stapes superstructure present and mobile? These two anchors define what you can build between[1971]. A columella — the strut that reconnects the chain — needs something solid above (handle, or failing that the drum) and a mobile target below (the stapes head if the arch survives, or the footplate if it does not).

Within that framework, the surviving remnant decides which manoeuvre is on the table:

• Incus body preserved, long process eroded, malleus and stapes arch present: the classic ground for a sculpted incus interposition(covered in its own module) — the body is carved into a strut between malleus handle and stapes head.
• Incus absent, malleus head spared, stapes arch present: the malleus head can be detached and reseated as a malleus head interposition, a useful autograft columella in canal wall down ears [2025].
• Malleus handle present but anteriorly displaced or medialised: malleus relocation mobilises and swings the handle back into line with the stapes so a graft or prosthesis can run straight [2004].

Two background conditions govern all of these. First, the remnant must be reusable: healthy enough to carve or mobilise and, critically, free of cholesteatoma matrix, because gross inspection cannot reliably exclude microscopic squamous epithelium within an involved ossicle. Second, the middle-ear environmentmust be favourable — a well-aerated cleft, healthy mucosa, a working Eustachian tube and quiescent disease. A poorly aerated, inflamed or fibrotic ear punishes every reconstruction, autograft or alloplastic alike.

TRepositioning a malpositioned malleus

A surprisingly common obstacle is not a missing ossicle but a badly positioned one. The malleus handle is normally drawn anteromedially by the tensor tympani tendon and held by the anterior malleolar ligament; in chronically diseased or retracted ears it can sit well forward and medial, almost in the plane of the anterior bony annulus. From there, no prosthesis or graft can reach the stapes in the straight, near-perpendicular line that efficient sound transmission demands — any strut you place runs at an awkward angle, is unstable, and transmits force poorly.

The malleus relocation technique, described by Vincent and colleagues, solves this. The handle is mobilised by sectioning the tensor tympani tendon and the anterior malleolar ligament, freeing it from its anteromedial tethers. The handle is then swung posteriorly and repositioned perpendicular to the stapes— head or footplate — so that a partial or total prosthesis, or a short autograft, can be coupled in a true columella line [2004]. The same manoeuvre rescues revision stapes surgery complicated by incus necrosis, where relocating the malleus restores a usable axis to the footplate[2011]. The price is loss of the tensor tympani’s contribution and the anterior suspension, but in a chain that is already broken these are small forfeits against a well-aligned, stable reconstruction.

TRemodelling the malleus head and incus remnant

When the incus has been consumed entirely — common after attic cholesteatoma — but the malleus head survives, the head itself becomes raw material. In a malleus head interposition, the head is detached from the handle, lifted out, cleared of disease, and reshaped so that it seats between the stapes below and the drum or malleus handle above, forming a short autograft columella. The manoeuvre is especially handy during canal wall down tympano-mastoidectomy, where it adds stability to the reconstruction at no cost and with a low complication rate [2025]. As with any autograft, the head is rinsed, inspected to exclude residual matrix, and — if the disease is cholesteatomatous — either avoided or sterilised before reimplantation.

The carving principles are shared across all remnant remodelling. Drilling is done off the field, with a fine diamond burr and a light touch, so that burr slips and debris cannot injure the inner ear. A small cup or acetabulumis fashioned to seat the stapes capitulum — deep enough to be stable, shallow enough to allow the rotational micro-motion of physiological transmission — and a groove or facet to receive the malleus handle. Geometry is everything: too short and the strut loses contact, leaving the air-bone gap; too long and it splints or subluxes the chain. The seated remnant should rest with gentle, stable contact at both ends, often protected by a wisp of fascia or a sliver of cartilage and buttressed by a well-supported drum so it is not displaced as the ear heals.

CHearing results and how to read them

Do these salvage moves actually restore hearing? The published series say yes, within the limits common to all ossiculoplasty. In the original malleus relocation series of 268 cases, the air-bone gap closed to within 10 dB in 56% of ears [2004]. Used to manage incus necrosis during revision stapes surgery, relocation brought 58.3% of ears within 10 dB and 83.3% within 20 dB, with hearing stable over a mean of two years [2011]. A prospective series of malleus head interpositions during canal wall down surgery reported residual air-bone gaps of roughly 9–11 dB across the speech frequencies — results comparable to the sculpted-incus literature, where about two-thirds of ears close to within 20 dB with essentially no extrusions [2025, 2005].

Two cautions temper these figures. First, they come from heterogeneous, mostly non-randomised series, often in selected ears, so cross-study comparison is loose; the honest reading is that a well-aligned native remnant gives hearing in the same band as a modern prosthesis, not that one technique is demonstrably superior. Second, outcome is governed less by the manoeuvre than by the ear. Staging systems built from large ossiculoplasty cohorts show that the surviving ossicular elements— above all a mobile stapes and a usable malleus — together with aeration and the absence of active disease predict hearing far more powerfully than whether the strut is the patient’s own bone, titanium or ceramic [2001, 1994].

CChoosing remodelling in the modern theatre

Set against the convenience of a pre-sized titanium or hydroxyapatite prosthesis, remnant remodelling has lost its former dominance: carving and repositioning take time and skill, the geometry is operator-dependent, and an autograft is living bone that can slowly resorb or ankylose in a hostile ear. Yet these techniques remain genuinely valuable. They cost nothing, never extrude through the drum the way an exposed alloplastic head can, and are indispensable where prostheses are unavailable or unaffordable — precisely the settings where much of the world’s ear surgery is done.

The practical rule is one of opportunism within discipline. When good native bone survives in a clean, well-aerated, non-cholesteatomatous ear, reuse it: sculpt the incus body, interpose the spared malleus head, or relocate a displaced malleus into line with the stapes, and you achieve a durable, biocompatible, cost-free reconstruction whose hearing rivals a manufactured prosthesis. When the remnant is diseased, the ear poorly aerated, the geometry irretrievable, or theatre time at a premium, reach instead for an alloplastic prosthesis. The decision, as always in ossiculoplasty, is less about the material than about the ear in front of you [2001].