Hallux valgus, commonly referred to as a bunion, is one of the most prevalent musculoskeletal deformities of the forefoot, affecting nearly 23% of adults and up to 35% of the elderly population. Characterized by a lateral deviation of the great toe and a corresponding medial prominence of the first metatarsal head, the condition often leads to chronic pain, difficulty with footwear, and significant functional impairment.1 Among the dozens of surgical interventions developed to address this deformity, the Chevron Osteotomy (also known as the Austin procedure) has emerged as the gold standard for treating mild to moderate cases.2 By combining biomechanical stability with a relatively straightforward surgical technique, the Chevron osteotomy provides a reliable method for restoring foot alignment and relieving patient discomfort.
Anatomy and Pathophysiology of the Bunion
To appreciate the utility of the Chevron osteotomy, one must understand the underlying pathology of a bunion. A bunion is not merely a “growth” of bone on the side of the foot; it is a complex three-dimensional subluxation of the first metatarsophalangeal (MTP) joint.3
In a healthy foot, the first metatarsal bone is aligned parallel to the second. In a patient with hallux valgus, the first metatarsal drifts inward (medially), increasing the Intermetatarsal Angle (IMA). Simultaneously, the big toe (hallux) leans toward the second toe, increasing the Hallux Valgus Angle (HVA). This “seesaw” effect creates the characteristic bump, which becomes inflamed and painful as it rubs against shoes.4 The goal of the Chevron osteotomy is to physically cut the bone and shift the metatarsal head back into its proper alignment, thereby narrowing the foot and straightening the toe.5
The Surgical Technique
The hallmark of the Chevron osteotomy is its namesake V-shaped (chevron) cut made at the distal end of the first metatarsal bone.6 The procedure is typically performed under local or regional anesthesia, often as an outpatient surgery.7
1. The Incision and Preparation
The surgeon begins with a medial incision over the first MTP joint.8 The prominent “bump” or exostosis is shaved down (ostectomy).9 Crucially, the surgeon must also address the tight soft tissues on the lateral side of the joint, often performing a “lateral release” to allow the toe to move back into a neutral position.10
2. The Osteotomy
The core of the procedure involves making two bone cuts that meet at a point, creating a 60-degree or 90-degree apex.11
- The Apex: Centered in the middle of the metatarsal head.12
- The Limbs: One cut extends toward the top of the foot (dorsal), and the other toward the sole (plantar).
3. Transposition and Fixation
Once the bone is cut, the “capital fragment” (the head of the bone) is shifted laterally—away from the midline of the body—to close the gap between the first and second metatarsals.13 This shift usually represents about one-third to one-half of the bone’s width. After the alignment is verified via X-ray (fluoroscopy), the bone is secured.14 While the V-shape offers inherent “interlocking” stability, modern surgeons typically use one or two small, headless compression screws to ensure the bone heals in the corrected position without shifting.15
Indications and Advantages
The Chevron osteotomy is primarily indicated for mild to moderate deformities, generally defined by an IMA of less than 15° and an HVA of less than 30°.16 Its enduring popularity in orthopedic surgery is due to several key advantages:
- Inherent Stability: The V-cut design allows the bone pieces to “nest” together, which resists displacement better than a simple straight cut.17
- Minimal Shortening: Unlike some other procedures, the Chevron technique preserves the length of the first metatarsal, which is vital for maintaining proper weight distribution across the ball of the foot.18
- Rapid Recovery: Because the cut is made in the “cancellous” (spongy) bone near the joint, healing is typically faster than cuts made in the denser mid-shaft of the bone.19
- Versatility: Recent advancements have allowed for Minimally Invasive Surgery (MIS) versions of the Chevron, using tiny “keyhole” incisions that reduce scarring and post-operative swelling.20
Recovery and Rehabilitation
Recovery from a Chevron osteotomy is a structured process designed to protect the bone while it knits back together (ossification).
| Phase | Timeframe | Goals & Restrictions |
| Early Post-Op | Weeks 0–2 | Elevation and icing to manage swelling; weight-bearing is allowed only in a specialized stiff-soled surgical shoe (heel-walking). |
| Mid-Recovery | Weeks 2–6 | Stitches are removed. Patients begin gentle range-of-motion exercises for the big toe to prevent “arthrofibrosis” (stiffness). |
| Transition | Weeks 6–12 | Transition into wide, supportive athletic shoes. Normal walking patterns are restored. |
| Full Activity | 3–6 Months | High-impact activities (running) and fashion footwear may be resumed as swelling fully subsides. |
Potential Complications and Risks
While the success rate of the Chevron osteotomy is high—often cited above 85–90% in terms of patient satisfaction—it is not without risks.
- Avascular Necrosis (AVN): This is a rare but serious complication where the blood supply to the metatarsal head is disrupted during the bone cut, leading to bone death.21
- Recurrence: If the underlying causes (such as ligament laxity or improper footwear) are not addressed, the bunion can return over time.
- Malunion or Nonunion: The bone may heal in the wrong position or fail to heal entirely, though screw fixation has made this uncommon.
- Transfer Metatarsalgia: If the first metatarsal is shortened too much or shifted incorrectly, the second toe may take on too much weight, leading to pain under the second toe joint.22
The Chevron osteotomy remains a cornerstone of forefoot reconstructive surgery. Its geometric elegance provides the stability required for early mobility while offering the corrective power necessary to resolve symptomatic hallux valgus. For the patient, it represents a path from chronic pain and limited activity back to a functional, active lifestyle. As surgical techniques continue to evolve toward minimally invasive approaches, the principles of the Chevron V-cut remain as relevant today as when they were first described decades ago.