Bunionette (Tailor's Bunion) Correction

Indication. A symptomatic bunionette with persistent pain over the lateral fifth metatarsal head that has failed non-operative management (wide footwear, padding, orthoses, and where relevant a corticosteroid injection for adventitial bursitis). Typical triggers are a painful lateral keratosis or bursitis that will not off-load in a shoe, recurrent callus at the lateral head, or a progressive deformity with a widening 4-5 intermetatarsal angle on serial weight-bearing radiographs. Surgery is for pain and footwear problems — not for cosmesis. Relative indications include patient preference for definitive correction after non-operative failure, concurrent first-ray pathology (hallux valgus, metatarsus primus varus) that can be addressed in the same sitting, an inflammatory arthropathy with a symptomatic lateral prominence, or a bunionette that is part of a global forefoot reconstruction in a cavus foot or forefoot adductus. Contraindications. Absolute: active soft-tissue or bone infection in the field, non-reconstructable peripheral vascular disease, or a non-ambulatory or medically unfit patient. Relative: a painless prominence with cosmetic concerns only; severe peripheral neuropathy (for example Charcot-Marie-Tooth) where recurrence is high and rehabilitation difficult; a smoker with poor healing capacity (the fifth metatarsal is prone to delayed union — counsel cessation first); and an active inflammatory-arthropathy flare (optimise medical management first). Non-operative management is first-line and is what most patients are treated with: wide, low-heeled shoes with a soft upper and a wide toe-box; a doughnut pad around the lateral prominence; a custom insole with a metatarsal pad and a fifth-metatarsal relief area; and a corticosteroid injection for associated adventitial bursitis (not for the bunionette itself). Reserve surgery for persistent pain that limits activity or footwear. The decision that matters — match the osteotomy to the Coughlin type. Every correction begins with the same dorsal exposure; the choice is which osteotomy (if any) to perform on the measured deformity:

For severe Type 3 deformity (4-5 IMA greater than 10 to 12 degrees) or revision, a basal closing-wedge osteotomy gives powerful correction but heals more slowly (8 to 12 weeks) with a higher nonunion rate; minimally invasive or percutaneous distal techniques are an alternative in selected, experienced hands, with smaller scars but limited long-term data. Consent specifically for recurrence (5 to 15 percent), transfer metatarsalgia to the fourth metatarsal (5 to 15 percent), nonunion (1 to 5 percent metaphyseal, up to 25 to 30 percent for a mid-shaft transverse cut), AVN of the head (rare, less than 1 percent), sural nerve injury or neuroma (1 to 5 percent), and a period of protected weight-bearing. Setup. Supine with a bolster under the ipsilateral hip to bring the foot neutral, a thigh tourniquet inflated to 250 to 300 mmHg after exsanguination, general or regional anaesthesia (ankle block) with local infiltration adjunct, and a mini C-arm brought in from the contralateral side. Confirm pre-operative weight-bearing AP and lateral films and measure the 4-5 IMA, the 4-5 DMAA, the fifth MTP angle, and the first-ray angles before planning the cut.

The goal is to expose the fifth metatarsal through the dorsal approach, protect the dorsolateral cutaneous branch of the sural nerve and the metaphyseal blood supply, perform the osteotomy matched to the Coughlin type, reduce the 4-5 IMA, and fix it stably enough for early protected weight-bearing. The exposure is laid out in full below (and in depth on the dorsal approach to the lesser metatarsals page).

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Rehabilitation | Phase | Timing | Weight-bearing / immobilisation | Therapy & review | |-------|--------|--------------------------------|------------------| | 1 | 0 to 2 weeks | Bulky dressing; heel-weight-bearing in a post-op shoe, forefoot off-loaded; elevate for 48 to 72 hours | Sutures out at 10 to 14 days; radiographs at 2 weeks | | 2 | 2 to 6 weeks | Distal chevron: heel-weight-bearing then full weight-bearing in post-op shoe. Coughlin oblique: heel-weight-bearing 4 to 6 weeks. Basal: non- or heel-weight-bearing 6 to 8 weeks | Begin active MTP range of motion at 2 to 3 weeks; radiographs at 6 weeks | | 3 | 6 to 12 weeks | Wide athletic shoe from 6 to 8 weeks; normal footwear with a wide toe-box from 8 to 12 weeks | Progressive activity; final radiographs at 3 months to confirm union | | 4 | 3 to 12 months | Custom orthosis with a metatarsal pad for 6 to 12 months | Return to running and sport at 3 to 4 months | Return to function. Office work at 2 to 3 weeks (in a post-op shoe), manual or standing work and recreational walking at 6 to 8 weeks, and running and sport at 3 to 4 months. Complications

Epidemiology. The bunionette, or tailor's bunion, is a symptomatic lateral prominence of the head of the fifth metatarsal. It is less common than hallux valgus but frequently coexists with it as part of a splayed forefoot, is often bilateral, and presents most often in adults in the fifth decade onward with pain and lateral keratosis driven by footwear. A structural lateral bow of the diaphysis or a wide 4-5 intermetatarsal angle is often developmental. Pathoanatomy. The lateral prominence arises from one of three mechanisms, which Coughlin distinguished and which dictate the operation. A wide 4-5 intermetatarsal angle pushes the fifth metatarsal head laterally; an exaggerated lateral bow of the diaphysis does the same with a normal head; or the lateral condyle of the head itself is simply enlarged. A tight lateral capsule and collateral ligament and a shortened abductor digiti minimi maintain the deformity. The soft-tissue envelope — lateral capsule, lateral collateral and transverse metatarsal ligament, the plantar plate and the flexor tendons — must be respected in the approach. Vascular anatomy that governs technique. The fifth metatarsal head is supplied by metaphyseal vessels entering the distal flare, supplemented by endosteal supply from a single nutrient artery that enters the middle third of the diaphysis. The middle third is therefore a watershed zone: a transverse osteotomy here devascularises the fragment and is the basis of the high nonunion rate. The oblique and distal metaphyseal osteotomies are designed specifically to spare this supply. Radiographic angles. The 4-5 intermetatarsal angle is measured on a weight-bearing AP film (normal 6 to 8 degrees; greater than 8 degrees defines Type 3). The 4-5 distal metatarsal articular angle (DMAA) measures the orientation of the distal articular surface (normal less than 8 degrees; an increased value adds a rotational component). The fifth metatarsophalangeal angle measures lateral deviation of the toe and is often relatively normal in bunionette.

Key evidence. Coughlin's longitudinal diaphyseal osteotomy with distal soft-tissue repair established the oblique diaphyseal technique for Type 3 deformity. Kitaoka's distal chevron showed reliable correction of mild-to-moderate bunionette with a single screw and rare AVN when lateral stripping is limited. Cooper and Coughlin reported durable medium-term results for the subcapital oblique osteotomy. Smith's anatomical study defined the single nutrient artery and the diaphyseal watershed zone — the rationale for avoiding transverse mid-shaft osteotomies. Roukis's field guide synthesised the techniques and made the central point that matching the osteotomy to the anatomical deformity is the most important determinant of outcome.