A note on this column: This article is general medical information, not a description of a service offered at this practice. Dr. Ishiguro's surgical practice is focused on hip and knee conditions — he does not treat or perform surgery for bunions or other forefoot deformities. This column is written to help readers understand a very common condition and know when and how to seek the right specialist, typically a foot and ankle-focused orthopaedic surgeon or podiatrist.
What a bunion actually is
A bunion is the common name for hallux valgus, a progressive deformity of the big toe (hallux) at the first metatarsophalangeal (MTP) joint. In hallux valgus, the big toe gradually drifts sideways toward the second toe, while the first metatarsal bone drifts in the opposite direction. This creates the characteristic bony prominence on the inside edge of the foot — which isn't new bone growth, but the head of the first metatarsal becoming more exposed as the joint alignment shifts.
It's a mechanical, structural deformity rather than a simple lump of tissue, which is why padding or shaving down the bump alone doesn't correct it — the underlying joint alignment is what determines whether the deformity is mild, moderate, or severe, and how it should be managed.
How common it is
Bunions are far from rare. A 2023 global systematic review and meta-analysis pooling data from 45 studies found an overall estimated prevalence of hallux valgus of 19% (95% CI, 13%–25%), with regional estimates of roughly 22% in Asia, 18% in Europe, and 16% in North America.
Who is most affected
- Sex — pooled prevalence was 23.7% in women versus 11.4% in men, making female sex one of the most consistent findings across studies
- Age — prevalence rises from about 11% in people under 20 to roughly 23% in those over 60
- Footwear — hallux valgus is rare in populations that don't habitually wear shoes, and is associated with narrow-toed or high-heeled footwear that crowds the forefoot
- Family history — a hereditary component is well described, with a tendency to run in families independent of shoe choice
- Foot mechanics — factors such as hypermobility of the first ray (the big toe's metatarsal segment) and flatter foot posture are thought to contribute biomechanically
Symptoms
The most obvious sign is the visible bump at the base of the big toe, but the symptoms that actually bring people to a clinic are usually pain and difficulty with shoe fit. Common complaints include aching or burning over the prominence — often worse in narrow or hard-soled shoes — redness or a thickened, irritated bursa over the bump, a callus under the ball of the foot as weight-bearing shifts, and in more advanced cases, the big toe crowding or overlapping the second toe, which can lead to a secondary hammer toe deformity. Range of motion at the big toe joint can also become limited as the deformity progresses, and some patients develop pain from altered pressure distribution across the rest of the forefoot rather than at the bunion itself.
Not every hallux valgus deformity is painful — some people have a visible bump with minimal symptoms for years, while others develop significant pain relatively early. This variability is one reason imaging and clinical grading matter more than appearance alone when deciding on treatment.
How the diagnosis is made
Diagnosis starts with a physical exam assessing the alignment of the toe, the flexibility and reducibility of the deformity, range of motion, and the condition of the skin and other toes. A weight-bearing (standing) X-ray of the foot is the standard way to confirm and grade the deformity, because the angles that matter are measured under the load of body weight, not with the foot relaxed.
| Measurement | What it captures | Typical severity thresholds |
|---|---|---|
| Hallux valgus angle (HVA) | The angle of big toe deviation relative to the first metatarsal | Normal <15°; mild 15–20°; moderate 20–40°; severe >40° |
| Intermetatarsal angle (IMA) | The angle between the first and second metatarsal bones | Normal <9°; larger angles generally indicate a more structural deformity |
These two angles, read together with the condition of the joint surface and the position of the small sesamoid bones underneath the metatarsal head, guide whether a deformity is best managed conservatively or is a reasonable candidate for surgical correction, and if so, which surgical technique fits the specific pattern of deformity.
What the evidence says about treatment
Not every bunion needs surgery, and for many people with mild to moderate symptoms, the first reasonable step is a genuine trial of conservative management focused on reducing mechanical irritation and pain.
Commonly used conservative options
- Wider, roomier footwear — reducing pressure on the prominence, often the single most impactful and simplest change
- Toe spacers, orthotics, and padding — used to offload pressure and, in some approaches, gently realign the toe during use
- Night splints — worn while sleeping to hold the toe in a corrected position
- Targeted exercise and manual therapy — aimed at the muscles that support the arch and first ray
- Activity modification and anti-inflammatory measures — for symptomatic flare-ups
What the evidence shows: A 2021 systematic review and network meta-analysis of 11 randomized controlled trials of conservative treatments for hallux valgus found that combinations such as exercise with a toe separator, night splints, and dry needling were most likely to reduce the hallux valgus and intermetatarsal angles, while toe separators, dry needling, and manipulation were more associated with improving patients' subjective symptoms (Ying J, Xu Y, Bíró I, Ren F. Int J Environ Res Public Health. 2021). The authors were careful to note that overall trial quality in this field remains limited, and that no single conservative treatment has been shown to reverse an established bony deformity — these measures are aimed primarily at symptom relief and slowing progression rather than correcting the underlying angle.
When a bunion is structurally significant and conservative measures haven't kept pace with the patient's pain or functional limitations, a corrective osteotomy — a planned surgical cut and realignment of the metatarsal bone, often paired with a soft-tissue release and sometimes a smaller osteotomy of the toe bone itself (a "chevron," "scarf," or "Akin" procedure, named for the pattern of the bone cut) — is the most established surgical approach. In recent years, minimally invasive percutaneous techniques performed through very small incisions have become more widely used as an alternative to traditional open surgery.
What the evidence shows: A randomized controlled trial comparing minimally invasive percutaneous chevron osteotomy with the traditional open chevron technique in 47 feet found that both approaches achieved a comparable, significant correction of the deformity — the intermetatarsal angle improved from about 15° to 6° with open surgery and from 14° to 7° with the minimally invasive technique, with no statistically significant difference between the groups on any measured outcome except for patient-reported satisfaction at 12 weeks, which favored the minimally invasive group (Kaufmann G, Dammerer D, Heyenbrock F, Braito M, Moertlbauer L, Liebensteiner M. Int Orthop. 2019;43(2):343–350). This suggests that, in appropriately selected patients, a less invasive approach can achieve a similar structural result to open surgery, though the right technique for a given foot still depends on the specific pattern and severity of the deformity.
When to see a specialist
A visible bump alone isn't necessarily a reason to rush into treatment, but persistent pain that limits walking or shoe options, progressive worsening of the toe's position, a developing overlap with the second toe, or skin breakdown over the prominence are reasonable triggers to see a foot and ankle specialist for a proper weight-bearing X-ray and grading. Earlier evaluation also matters because, as with many progressive joint deformities, waiting until the deformity is severe can narrow the range of surgical options later on.
References (PubMed / Journal)
Cai Y, Song Y, He M, He W, Zhong X, Wen H, Wei Q. Global prevalence and incidence of hallux valgus: a systematic review and meta-analysis. J Foot Ankle Res. 2023;16:63. DOI: 10.1186/s13047-023-00661-9
Ying J, Xu Y, Bíró I, Ren F. Adjusted Indirect and Mixed Comparisons of Conservative Treatments for Hallux Valgus: A Systematic Review and Network Meta-Analysis. Int J Environ Res Public Health. 2021;18(7):3841. DOI: 10.3390/ijerph18073841
Kaufmann G, Dammerer D, Heyenbrock F, Braito M, Moertlbauer L, Liebensteiner M. Minimally invasive versus open chevron osteotomy for hallux valgus correction: a randomized controlled trial. Int Orthop. 2019;43(2):343-350. DOI: 10.1007/s00264-018-4006-8