Hallux Valgus: Looking Beyond the Big Toe

Hallux valgus is not simply a problem of the big toe. It may involve changes in the foot’s weight-bearing and push-off mechanics. Changes in gait may also affect loading elsewhere in the lower limb. Effects on the knee, hip, pelvis or lower back are possible mechanisms to consider, not inevitable consequences or established causes of symptoms in an individual.

Local Muscle Balance

At the local level, one important feature is the balance between the adductor hallucis and the abductor hallucis:

1. The adductor hallucis pulls the big toe towards the second toe.
2. If the abductor hallucis cannot provide sufficient opposing force, dynamic stability around the first metatarsophalangeal joint may decrease.
3. The big toe may gradually deviate towards the second toe, contributing to hallux valgus.
4. As the deformity progresses, the abductor hallucis may move towards the sole of the foot. Its direction of pull and mechanical advantage can change, reducing its ability to oppose the deformity and reinforcing the cycle.

Local rehabilitation may therefore include reducing excessive soft-tissue tension and activating and strengthening the abductor hallucis and other stabilising muscles. [1]

The Whole-Foot Picture

Hallux valgus has multiple contributing factors, and their importance may differ from person to person. The factors below may be relevant to assessment, but an association does not establish causation, and the strength of evidence varies: [2]

• Lowering or collapse of the foot arch.
• Instability or increased mobility of the first ray.
• Excessive foot pronation.
• Altered mobility of the first metatarsophalangeal joint.
• Reduced function of the tibialis posterior, fibularis longus or intrinsic foot muscles.
• Tightness in the calf muscles.
• Long-term use of shoes that are too narrow.

These factors may change how load is distributed through the foot and influence the alignment of the first metatarsal and big toe. Assessment may therefore include foot alignment, joint mobility, muscle function and gait, so that treatment can be tailored to the individual.

A Broader Rehabilitation Approach

Hallux valgus is not always an isolated local problem; it can involve the mechanics of the foot as a whole. Local soft-tissue work and strengthening may help pain and function, while identifying and addressing broader biomechanical factors may support more stable, longer-term management.

Conservative treatment cannot guarantee correction of the deformity, and persistent pain or marked progression should be medically assessed. [3]