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📋 Condition Guide2024-01-18

Bunions (Hallux Valgus): Causes, Symptoms, and Surgical Options

A bunion is a bony prominence at the base of the big toe caused by progressive drift of the big toe toward the second toe. Bunions cause pain, difficulty with footwear, and can become severely disabling.

Educational content only. This article is not medical advice. Always consult a qualified orthopedic surgeon or physician for diagnosis and treatment.

What Is a Bunion?

A bunion (hallux valgus) is a deformity of the big toe characterized by:

  1. Valgus deviation of the great toe (drifting toward the second toe)
  2. Varus drift of the first metatarsal (the bone behind the big toe moving inward)
  3. Bony prominence (the "bunion bump") on the medial side of the first MTP joint

The result is a painful, prominent bump at the base of the big toe that becomes irritated by footwear.

Bunions are extremely common — affecting approximately 23% of adults worldwide, with prevalence increasing with age. Women are 2–4x more commonly affected than men.

Causes

Bunions are primarily genetic — the tendency for the first ray to drift develops from inherited foot structure. Footwear (particularly narrow, pointed shoes and high heels) is NOT the primary cause of bunions but dramatically accelerates progression and worsens symptoms.

Contributing factors:

  • Family history (the most significant factor)
  • Hypermobile first ray
  • Flat feet (pes planus)
  • Inflammatory arthritis (rheumatoid arthritis)
  • Narrow footwear and high heels (accelerate progression)

Symptoms

  • Bony prominence on the inner side of the foot at the big toe joint
  • Pain and inflammation over the bunion bump — especially with footwear pressure
  • Redness and swelling over the joint
  • Restricted big toe motion — the MTP joint becomes arthritic
  • Shoe fitting difficulty — cannot find comfortable footwear
  • Calluses between the big and second toe (from crowding)
  • Second toe overriding or hammertoe formation (as the big toe pushes the second toe up)
  • Bursitis (inflamed bursa over the bump)

Diagnosis

Clinical diagnosis. X-rays (weight-bearing) confirm the deformity and quantify severity:

  • Hallux valgus angle: Normal <15°; mild 15–20°; moderate 20–40°; severe >40°
  • Intermetatarsal angle (IMA): Normal <9°; increased IMA is the primary deformity to correct

Treatment

Conservative (Non-Surgical)

Conservative treatment manages symptoms but does not correct the deformity. The bunion will continue to progress without surgery.

  • Wide toe box shoes: The single most important change — relieving pressure on the bunion reduces pain dramatically
  • Bunion pads and toe spacers: Cushion the bump and separate the great and second toes
  • Orthotics: Custom insoles to support the arch and offload the first MTP joint
  • Night splints: Hold the toe in a corrected position; may slow progression but do not permanently correct deformity
  • NSAIDs: Pain management
  • Bunion pads and protective sleeves

Surgical Treatment (Bunionectomy)

Surgery is the only definitive treatment. Indicated for:

  • Disabling pain unresponsive to conservative treatment
  • Significant deformity impacting function or footwear
  • Patient is medically fit for surgery

Common procedures:

  • Distal metatarsal osteotomy (Chevron, Austin): Cut in the metatarsal head; for mild-moderate deformity; outpatient
  • Proximal osteotomy (Scarf, Lapidus, etc.): For moderate-severe deformity; realigns the first ray more fundamentally
  • Lapidus bunionectomy (first TMT fusion): Addresses hypermobility at the base joint; increasingly used for moderate-severe deformity; good durability
  • 3D bunion correction (Minimally invasive): Growing technique using small incisions and 3D fluoroscopy guidance

Recovery from Bunion Surgery

  • Non-weight bearing: 2–6 weeks (depends on procedure and surgeon preference)
  • Protective boot/shoe: 4–8 weeks
  • Return to regular shoes: 3–6 months
  • Full recovery: 6–12 months (swelling persists for months)

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