Not every prominent bump on the side of the foot is the same condition, and not every bunion responds to the same treatment. Patients often arrive at a consultation describing “a bunion” when the underlying deformity may in fact be a Tailor’s bunionette, a juvenile bunion still in progress, or an arthritic joint that has worn down over years. Understanding which type is present matters because it changes both the diagnostic approach and the treatment plan.
Mr Kaser Nazir, a Harley Street, NHS Consultant specialising in keyhole bunion correction, sees this distinction play out daily in clinic: which bunion deformity is present, and what treatment would actually help, depends entirely on correctly classifying what is happening at the joint. This article sets out the main categories of bunion — hallux valgus, Tailor’s bunionette, juvenile bunions and arthritic bunions — and explains how imaging and clinical assessment distinguish between them.
Recognising which category of bunion is present is the first step. The next is understanding what can be done about it. Do You Need Bunion Surgery? Causes, Non-Surgical Care & Risks looks at when conservative treatment is appropriate, when surgery becomes the more sensible option, and what the risks are either way.
The Main Categories of Bunion Deformity
Broadly speaking, there are two structural types of bunion deformity: one affecting the big toe, known as hallux valgus, and one affecting the fifth metatarsal (the long bone leading to the little toe), known as Tailor’s bunionette or Tailor’s bunion. Both share a common mechanism: the metatarsal bone deviates out of its normal position, and the toe on the affected side follows it. However, they occur on opposite sides of the foot and are treated somewhat differently.
Hallux Valgus
Hallux valgus is a deformity of the big toe involving both the first metatarsal and the proximal phalanx (the first bone of the big toe itself). In this deformity, the metatarsal deviates inwards, towards the middle of the body, while the phalanx deviates outwards towards the second toe. This is the most common type of bunion deformity, and it is the presentation most patients recognise: a bony prominence on the inside edge of the foot that causes pain and makes standard footwear difficult to wear.
Tailor’s Bunionette
Tailor’s bunion, also known as a bunionette, is a deformity of the fifth metatarsal, where the bone bows outward towards the outside of the foot. This creates a bony prominence and can lead to bursitis (inflammation of the fluid-filled sac that cushions the joint) over the fifth metatarsal head, along with pain and significant difficulty in daily use of the foot. Where hallux valgus affects the big toe side of the foot, Tailor’s bunionette affects the little toe side. The mechanism of bone deviation is similar, but the location and footwear impact differ.
Juvenile Bunions
When a bunion deformity develops before adulthood, it is classified as juvenile. Most bunion deformities become clinically apparent during the teenage years. In these younger patients, progression can initially be managed conservatively with splints and insoles, but surgery is typically deferred until the growth plate has closed, generally around the age of 16. Mr Nazir confirms this approach in practice: younger patients, including children and pre-teens, are managed conservatively because “the evidence to intervene early before the growth plates have fused is poor,” meaning that even when surgical correction is eventually required, it should wait until at least 16 years of age.
Arthritic Bunions
An arthritic bunion is a bunion deformity accompanied by joint stiffness, where the cartilage covering the bony prominence has also worn away. This is a materially different problem from a straightforward positional bunion. As Mr Nazir explains, in a standard bunion there is “normal range of motion in extension or flexion on passive examination of the big toe joint,” whereas arthritis presents with “deep joint pain in the big toe joint and ongoing stiffness,” which is suggestive of cartilage wear rather than simple malpositioning. Typical treatment for an arthritic bunion involves either fusion of the big toe joint or joint replacement, though fusion tends to produce better long-term outcomes: it removes movement at the joint but eliminates pain and corrects the underlying deformity.
How Bunions Are Diagnosed: Imaging and Clinical Assessment
Diagnosis of both bunions and bunionettes is confirmed via X-ray. Patients experiencing pain should see a podiatrist or doctor for assessment. Radiographic evaluation allows the surgeon to measure the precise degree of deformity and distinguish a positional bunion from an arthritic joint.
Reading the X-ray: IMA and HVA
Two specific angles are used to grade bunion severity on X-ray, and Mr Nazir describes both in detail. The intermetatarsal angle (IMA) measures the deviation between the first and second metatarsal bones, and it increases as the bunion progresses. A normal IMA sits at 7 to 9 degrees; a mild bunion measures up to 12 degrees; moderate is 12 to 16 degrees; severe is 16 to 20 degrees; and anything above 20 degrees is classified as very severe.
The hallux valgus angle (HVA) measures the position of the big toe relative to the first metatarsal, with a normal angle sitting at 10 to 15 degrees. Together, these two measurements give a precise, reproducible picture of how far the joint has drifted from its normal alignment, and they inform which surgical approach, if any, is appropriate.
Distinguishing a Bunion From Arthritis on Examination
Beyond imaging, clinical examination plays a key role in distinguishing a straightforward bunion from an arthritic joint. On passive examination, a joint affected only by bunion deformity retains a normal range of motion in extension and flexion. An arthritic joint, by contrast, presents with deep joint pain and ongoing stiffness, which points to cartilage wear rather than simple bone malalignment. This distinction matters because the treatment pathways diverge sharply: a positional deformity can often be corrected with an osteotomy (a procedure that cuts and repositions the bone), while an arthritic joint more often requires fusion or replacement.
Why Family History and Footwear Matter for Classification
Understanding what drives a bunion’s development also helps place it within the correct category. Mr Nazir notes that unsupportive footwear is a recurring factor in patients presenting with symptomatic bunions: “wearing high heels is not uncommon,” and “ballerina flats or very unsupportive shoes with no real structure” frequently contribute to bunions becoming painful. Genetics also plays a substantial role. When asked what proportion of his patients report a family history of bunions, Mr Nazir observed that the majority, if asked about their grandparents, would identify a positive family history. This combination of genetic predisposition and footwear choice is relevant across bunion types, though its practical significance is greatest in adult-onset hallux valgus and in monitoring juvenile bunions for early progression.
How Treatment Differs by Bunion Type
For Tailor’s bunionette, surgery typically involves an osteotomy procedure that cuts and resets the bone into a corrected position. This can be performed using minimally invasive surgery, with a small screw used to fix the bone in its new position. This mirrors the philosophy behind Rapid Bunion™, Mr Nazir’s trademarked minimally invasive bunion correction protocol, though patients should note that bunionette correction and hallux valgus correction, while related in technique, address different bones and require individual assessment.
For juvenile bunions, the initial approach is conservative: splints and insoles to slow progression, with surgical correction reserved for after growth plate closure at around age 16. Operating earlier is not supported by current evidence.
For arthritic bunions, treatment shifts away from realignment osteotomy and towards fusion or joint replacement, with fusion generally favoured for its long-term durability, despite the trade-off of losing joint movement.
Across all bunion types, treatment options generally fall into two broad categories: minimally invasive or open osteotomy procedures. Bunion progression tends to occur gradually over a period of years, and while it cannot be stopped indefinitely through conservative measures, insoles can help slow the rate of progression.
What This Means for Patients Considering a Consultation
Patients who are uncertain whether their foot deformity is a “standard” bunion should not assume their case falls into a single, generic category. The practical starting point is the same regardless of presentation: an in-person assessment combined with weight-bearing X-rays to measure the IMA and HVA, alongside a clinical examination of joint range of motion.
For a patient with a classic inward-deviating big toe deformity, hallux valgus correction, potentially via the Rapid Bunion™ protocol, may be appropriate once imaging confirms the degree of deviation. For a patient with a prominence on the outside of the foot near the little toe, the presentation is more likely a Tailor’s bunionette, which follows a different but related surgical pathway involving osteotomy and screw fixation. Parents of teenagers noticing an emerging bunion should expect a conservative, monitoring-led approach until the growth plates close, rather than early surgical intervention. Patients with longstanding joint pain and stiffness, rather than simply a cosmetic prominence, should be assessed specifically for arthritic change, since this points towards fusion or replacement rather than a realignment procedure.
In every case, the starting point is the same: a clear diagnosis before any discussion of treatment. Referring clinicians, GPs, podiatrists and physiotherapists, can use this same IMA/HVA framework and the distinction between positional and arthritic presentations when deciding whether a patient’s case warrants specialist referral.
Getting the Right Diagnosis Before Considering Surgery
Bunions are not a single condition. Hallux valgus, Tailor’s bunionette, juvenile bunions and arthritic bunions each have a distinct mechanism, a distinct diagnostic profile on X-ray and clinical examination, and a distinct treatment pathway. Correct classification, confirmed through imaging measurements such as the IMA and HVA, and through assessment of joint range of motion, is the foundation for any sound treatment decision.
Patients uncertain about which category their deformity falls into, or clinicians seeking a second opinion on classification and treatment options, can book a consultation with Mr Nazir to review imaging and discuss whether Rapid Bunion™ or an alternative approach is appropriate for their specific presentation. More detail on the Rapid Bunion™ protocol and recovery expectations is available on the Rapid Bunion™ page, and further general guidance on bunion diagnosis is published by the NHS.
Book a consultation with Mr Nazir to get a clear diagnosis of your bunion type
