Symptoms come before appearance
The first requirement is usually a meaningful clinical problem rather than cosmetic concern alone. Surgery may be discussed when bunion pain, shoe pressure, recurrent inflammation, difficulty walking, reduced participation or associated lesser-toe symptoms continue despite reasonable non-surgical management. A foot can appear quite deformed but cause little difficulty, while a less dramatic bunion can be painful and functionally limiting. The decision must therefore be driven by the patient's symptoms and goals.
Mild-to-moderate deformity
A distal Austin or Chevron osteotomy is traditionally associated with mild-to-moderate hallux valgus. Weight-bearing X-rays are used to measure relationships such as the hallux valgus angle and intermetatarsal angle, but numerical thresholds are only part of the assessment. Rotation of the first metatarsal, sesamoid position, joint congruence and the shape of the metatarsal head also matter. Modern modifications may extend the corrective range, but larger or more complex deformities may be better addressed with a different osteotomy or a procedure closer to the base of the first metatarsal.
A reasonably preserved joint
The operation is joint preserving, so it is most logical when the first metatarsophalangeal joint still has useful cartilage and movement. Mild cartilage wear does not automatically exclude an osteotomy, but substantial arthritis, painful restriction, dorsal spurring or advanced joint degeneration may change the treatment objective. In that situation, preserving a severely damaged joint may not provide the most reliable pain relief, and an arthrodesis or another procedure may need to be discussed.
Flexible and correctable alignment
Clinical examination assesses whether the big toe and first metatarsal can be brought into a more normal relationship, whether the joint is congruent and how the deformity behaves during standing and walking. A flexible deformity is often more amenable to joint-preserving correction than a rigid, longstanding deformity with fixed soft-tissue contracture. The position and stability of the first ray, the lesser toes and the arch are also considered because they influence procedure selection and recurrence risk.
Adequate bone quality and healing capacity
The osteotomy must unite in its corrected position. Bone quality, smoking or nicotine use, diabetes control, nutrition, vascular status, medications and other medical conditions can influence healing. Poor circulation, active infection or an uncontrolled systemic condition may make elective surgery inappropriate until the risk has been addressed. Osteoporosis does not always prevent surgery, but it may affect fixation choices, weight-bearing instructions and the preferred procedure.
Realistic expectations
A suitable candidate understands that bunion surgery aims to reduce pain, improve function and produce a more functional alignment. It cannot guarantee a perfectly straight toe, a particular shoe style or a completely swelling-free foot. Some stiffness, sensory change or residual prominence can occur, and recurrence remains possible. Patients who understand the recovery and accept that healing continues for months are better positioned to make an informed decision.
Capacity to complete recovery
Suitability includes practical factors. The patient must be able to protect the foot, use the prescribed postoperative shoe or boot, elevate the limb, attend follow-up appointments and comply with wound and activity instructions. Work duties, caring responsibilities, stairs, driving and support at home should be considered before a date is chosen. A technically appropriate operation can still be poorly timed if the patient cannot safely follow the recovery plan.
When another procedure may be better
A Chevron osteotomy may not be the preferred choice where there is severe hallux valgus, pronounced first-ray instability, advanced arthritis, major rotational deformity, substantial bone loss, recurrent deformity after previous surgery or a complex neuromuscular or inflammatory condition. These situations do not necessarily mean that surgery is impossible. They mean that a different corrective strategy may provide a more durable result.
Shared decision-making
The final decision combines the patient's lived experience with clinical and imaging findings. There is no single X-ray measurement that automatically proves someone should have an Austin osteotomy. A good consultation explains why the proposed procedure matches the deformity, what alternatives exist, what recovery requires and what limitations remain.