Foot mechanics are often the last thing on anyone’s mind – that is, until they’re giving you trouble.

Forefoot varus is an example of a foot problem that flies under the radar – affecting thousands, but seldom discussed beyond a podiatrist’s office. This structural deformity represents a condition where the inside of the forefoot is elevated relative to the outside when the heel is in a neutral stance.

This seemingly benign misalignment causes a cascade of effects throughout the rest of your body.

It can contribute to knee pain, patellofemoral pain syndromes, chronic ankle instability, and more.

In this article, I’ll give an overview of the pathomechanics of forefoot varus, and what implications it has to daily movement as well as existing solutions from a practical standpoint.

Forefoot Varus Biomechanics Explained

Forefoot varus is classified as a structural deformity – not a soft tissue problem, not something you can stretch away, long term.

It’s determined by the downward tilt of the forefoot relative to the calcaneus along the x axis measured in the subtalar joint neutral position.

In simple terms, this refers to the amount of torsion on the talar dome that results when the forefoot adopts an inverted orientation relative to the rear foot.

The etiology of the deformity

As you might expect, forefoot varus is most often a congenital malformation.

During gestation, the fetal foot doesn’t fully-rotate into the restored position, leaving a certain degree of inversion.

Depending on the sources you read, a significant percentage of the population can be classified as having forefoot varus, but it’s generally believed that the deformity remains undiagnosed because practical compensation occurs subconsciously in gait.

Occasionally trauma or identifiable neuromuscular disease can present with this abnormality, but true structural variation inherited throughout familial lines presents most commonly.

Pathomechanic compensation

Once you understand that the forefoot is raised, it makes sense that the body’s answer to this problem is to pronate the foot – roll inward – to compensate for the lack of ground contact along the two medial toes.

Forefoot pronation is an automatic process that takes place during every cycle of gait.

This over-pronation accrues over time and places stress on the entire kinetic chain in the lower limb; the arch flattens, the tibia pronates and medially rotates, the knee tracks in a plane of motion that they’re typically not adapted for, and the hip follows.

Patients with this condition are often never aware that they’ve been walking the wrong way because the pain shows up so far from the actual evidence of the anatomical misalignment.

Forefoot Varus Symptoms and Diagnosis

The most common presentation is not right above the ankle joint.

This is one of the most difficult aspects of forefoot varus, as many of the symptoms are far-removed from the actual deformity.

symptoms that may present

Pain along the inside border of the foot or ankle, on the ball of the foot, or on the heel originate in the way the foot is constantly pronating downward.

Ligament strains and tendinopathies like posterior tibialis dysfunction are regularly associated as a result of the excessive load.

People with a forefoot varus position will also display an excess of compensatory internal tibial rotation.

Related symptoms may include patellofemoral syndrome, iliotibial band tightness, hip open chain internal rotation, or quadriceus overload.

Standing or walking fatigue (especially in the calves and arches) can be a good indicator too – high mileage runners are more likely to have lower limb symptoms due to the added mechanical stress.

Diagnosing forefoot varus

The only truly accurate evaluation occurs at a clinic or sports medicine practice.

A qualified practitioner will perform a clinical gait analysis with either observational assessment and/or 2D analysis, while placing the subtalar joint in its neutral position, and observing the relationship of the forefoot to the rearfoot.

The evidence of a forefoot varus deformity is a relative displacement between the dorsal surface of the calcaneus and the dorsal proximal phalanx of the hallux.

It’s not something you’d be able to self-diagnose with enough certainty to exclude professional evaluation.

A plain film x-ray may show deviation in the talonavicular or talotarsal joints, but won’t be necessary 99% of the time.

Differential diagnosis will likely include forefoot supinatus – a soft tissue adaptation that appears much the same, but is entirely reversible with the right treatment.

Managing Forefoot Varus Problems

The good news is that though bone is bone, this structural deviation can be partially masked with targeted intervention.

There is no non-surgical treatment that will permanently change the shape of the bones, but orthotics and short term strengthening exercises can alleviate most of the functional impact.

Custom orthotics and footwear

If you have forefoot varus, the best thing you can do is get a custom orthotic fabricated.

Wedges are incorporated into the device along the inner border of the forefoot (called a forefoot varus post), so that your foot can contact the ground evenly without rolling inward.

The orthotic centrally positions the rearfoot and stretches the plantar fascia further to help control the excessive pronation throughout the gait cycle.

One-size-fits-all insert products are unable to adequately support this specific deformity; the posted section must be optimized for the individuals maximum inversion angle.

Shoe choice also factors in – the best designs incorporate a broad, stable forefoot contact surface with minimal flare on the sides.

Extremely soft, cushioned, unstable options are less than ideal.

Therapeutic exercises and muscle strengthening

For the structural problem, the orthotic manages the functional component.

Otherwise, targeted strengthening of the muscles controlling high pronation can add yet another piece to the puzzle.

The posterior tibialis is the prime mover, so short foot exercises will benefit; think of primarily depressing the first toe and shortening the foot, but without curling the toes forward.

Calf raises or single leg heel raises build up the muscles that support the arch.

The hip abductors such as the gluteus medius help prevent excessive tibial rotation.

And mobility work for the calf and Achilles tendon can help minimize the amount of compensation that takes place during active contraction.

Try short daily sessions instead of long efforts – consistency over intensity will yield the best long term results.

This article demonstrates how dynamic systems theory applies to the topic of the body; forefoot varus is representative of the notion that pain in one segment or joint of the body can directly benefit from correction at a joint much further away.

However, given the right orthotic treatment, footwear and strengthening exercises, most tolerate and adapt to this condition and are able to play, work and carry on pain free.