7The Postauricular Approach and Wide Exposure

FA corridor, not a window

There are three ways into the tympanic membrane and middle ear: down the ear canal itself (the transcanal or permeatal route), through a small incision at the canal entrance (the endaural route), and from behind the ear, swinging the whole auricle forward (the postauricularroute). The first two are windows — you look through a fixed aperture. The postauricular approach is different in kind: it opens a wide corridor, lifting the ear out of the way so that the canal, the drum, and the mastoid cortex all lie open in a single field. It is for this reason that it has become the workhorse exposure of otologic surgery, the default whenever a case is large, anterior, revision, or likely to need work in the mastoid [2010].

The skin incision is a curve placed a few millimetres behind the postauricular sulcus— the crease where the ear meets the scalp — carried over the mastoid. It is conventionally called Wilde’s incision, after the nineteenth-century Dublin surgeon Sir William Wilde, and it remains the standard entry both for tympanoplasty and for mastoidectomy [2023]. A longer incision simply buys a wider field, which is why the same approach scales smoothly from a straightforward graft to a complex revision. Nothing about the postauricular route commits the surgeon to a particular operation; it commits them only to seeing more.

FBuilding the exposure, layer by layer

The approach is assembled in a deliberate sequence, each layer earning the next. After the skin incision, dissection passes down to the silvery temporalis fascia above the ear, from which a graft is harvested, flattened, and set aside to dry; temporalis fascia is the standard underlay material for the reconstructed drum [2010]. A periosteal incision, often cut in a T or 7 shape, is then raised forward toward the bony canal. With the periosteum lifted, the auricle and the lateral canal skin can be reflected anteriorly and held there with a Penrose drain or a self-retaining retractor, so that the whole ear swings out of the line of sight.

Within the canal, the posterior skin is incised and elevated as a vascular strip— a pedicled flap of canal skin that keeps its blood supply — and the tympanomeatal flap is raised to the fibrous annulus. The annulus is lifted out of its sulcus, the middle-ear mucosa entered, and the chorda tympani identified and protected. Only now is the field fully open: the drum and its entire annulus, the ossicular chain, and, if the periosteum has been carried far enough back, the mastoid cortex, all presented together. The graft is then placed, classically by the underlay technique, medial to the drum remnant and tympanomeatal flap [2023].

TWhy anterior perforations choose this approach

The single most important reason a surgeon reaches for the postauricular approach in a simple tympanoplasty is the anterior perforation. The anterior part of the drum is the hardest to see and the hardest to graft, for a geometric reason: the anterior canal wall frequently bulges, and that prominence throws a shadow over the anterior annulus when one looks straight down a speculum. A graft laid against an unseen anterior margin is a graft that may not seat, and anterior residual perforation and blunting— loss of the sharp acute angle between drum and anterior canal — are the classic failures.

Reflecting the auricle forward, and then formally drilling down the anterior bulge (an anterior canaloplasty), converts that oblique, shadowed view into an en-face one: the surgeon looks squarely at the anterior annulus and can lay the graft accurately along its whole circumference. This is why textbooks list anterior perforations, a prominent anterior canal bulge, and revision myringoplasty as the indications that tip the choice toward a postauricular approach[2010, 2023]. It is worth stressing what the advantage is and is not: it is an advantage of exposure and accuracy, not of intrinsic biological success.

The data bear this out. When the postauricular and transcanal approaches are compared head to head, graft take rates are statistically indistinguishable — of the order of 91–97% in good hands — and the closure of the air–bone gap is similar, with both routes achieving most of their benefit at low frequencies[2021]. Three-arm comparisons that add an endoscopic transcanal or modified endaural route reach the same conclusion: no approach closes drums intrinsically better than another. The postauricular approach earns its keep not by a higher take rate but by making a difficultdrum — anterior, bulging, scarred — behave like an easy one.

TChoosing among the three corridors

Because the approaches are equivalent in their end result, the choice between them is a trade of exposure against morbidity. The transcanal route is the least invasive and the quickest, ideal for posterior or readily accessible perforations and for endoscopic work, but it is defeated by an anterior bulge and offers no road to the mastoid. The endaural route is a sensible middle ground, widening the anterior view through a small intracanal incision while still falling short of a full postauricular canaloplasty. The postauricular route gives the widest field of all and is the only one of the three that simultaneously opens the mastoid — at the cost of the most tissue dissection and the longest open-and-close time[2010].

The practical algorithm follows from this. A posterior perforation in a wide, straight canal is a transcanal or endoscopic case. An anterior perforation, a bulging anterior wall, a revision field, or any ear in which the surgeon suspects mastoid disease tips decisively to the postauricular approach, because only it provides the necessary view and keeps the option of a mastoidectomy open without a second incision. The endaural approach is chosen when a little more anterior exposure than transcanal is wanted but the mastoid is certainly not in play. Crucially, the decision is made on exposure requirements, not on any expectation of better hearing[2021].

TThe price of width: nerves, time and the auricle

Wide exposure is not free. The most consistent complaint after a postauricular incision is auricular numbness, because branches of the great auricular nerve and the lesser occipital nerve cross the postauricular region and supply the helix, the lobule, and the skin behind the sulcus; a standard incision commonly divides them. Prospective series report sensory loss in roughly two-thirds of patients immediately after surgery, recovering in most over the following months but persisting as a nuisance in a minority [2020, 2020]. Placing the incision and dissection to spare these branches measurably reduces the deficit, which is the rationale for the various modified postauricular incisions[2020].

Two other concerns are routinely raised and largely reassuring. The first is whether dividing the postauricular soft tissues leaves the ear protruding. Prospective measurement of the auriculo-mastoid distance before and a year after postauricular tympanoplasty shows no significant lasting protrusion, and a focused literature review reaches the same conclusion — transient prominence usually settles and is not a reliable complication of the approach[2020, 2023]. The second is simply time: opening and closing a postauricular field takes longer than a speculum case, and that, together with the soft-tissue dissection, is the real trade-off accepted in exchange for the exposure.

CThe workhorse for combined tympanomastoid surgery

For the clinician planning chronic-ear surgery, the postauricular approach’s defining virtue is that one field serves two operations. The same exposure that grafts the drum lays bare the mastoid cortex, and from there the surgeon can proceed without any further incision to a cortical mastoidectomy, opening the antrum and the epitympanum with a clear superior view of the attic and its ossicular contents. A posterior tympanotomy(facial recess approach) drilled from the mastoid then delivers a second line of sight into the mesotympanum, the stapes, and the round window — the access that makes canal-wall-up surgery and posterior ossicular work possible [2010]. This is the corridor in which combined-approach tympanoplasty and ossiculoplasty are carried out.

That breadth is exactly why the approach is the workhorse of reconstructive ear surgery. Disease clearance and hearing reconstruction are not separable tasks: an ossiculoplasty is only as durable as the clearance beneath it, and the recesses that shelter residual cholesteatoma — the epitympanum, the facial recess, the sinus tympani — are reached, or at least approached, through this one wide window. Where canal-wall-up clearance is feasible it is preferred, because preserving the posterior canal wall protects middle-ear volume and the acoustic environment on which the prosthesis depends; the postauricular approach permits this without forcing a canal-wall-down cavity [2010, 2023]. It is wise to remember that even wide exposure does not abolish every blind spot — a deep sinus tympani may still demand an angled endoscope — but no other single corridor opens so much of the tympanomastoid compartment at once.

The lesson for practice is therefore one of planning, not reflex. The surgeon chooses the postauricular approach when the anatomy is anterior or bulging, when the field is a revision, or when the mastoid may need to be entered — and accepts the longer dissection and the transient numbness as the known price of an exposure that keeps every reconstructive option open in a single operation[2010, 2010].