Transverse flatfoot
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Transverse flatfoot, also referred to as splayfoot or forefoot widening, denotes a change in the geometry and function of the front part of the foot, accompanied by an abnormal load distribution beneath the metatarsal heads. In clinical practice, diagnosis is primarily based on symptoms, biomechanical examination, and the assessment of areas of increased pressure, as the appearance of the forefoot alone has limited diagnostic value. The condition can lead to metatarsal pain, calluses, corns, and toe deformities. Conservative management includes appropriately selected footwear, insoles or offloading pads, foot and calf muscle exercises, podiatric treatment, and physical therapy. The selection of methods depends on the cause of the symptoms, the flexibility of the deformity, and coexisting conditions.
Transverse flatfoot - why does the transverse arch collapse
The front part of the foot forms a functional system of five metatarsal bones, metatarsophalangeal joints, ligaments, the plantar aponeurosis, interosseous and lumbrical muscles, and the tendons of long muscles. The term „collapse of the transverse arch” is a biomechanical simplification. During weight-bearing, the forefoot physiologically widens, and all metatarsal heads participate in load transmission. A clinical problem arises when pressure becomes excessively concentrated under selected heads, most commonly the second and third.
Disruption of forefoot mechanics can be caused by:
- first ray insufficiency, i.e., the limited ability of the big toe and the first metatarsal bone to take on the load during push-off;
- hallux valgus, which alters the course of tendons, the position of the sesamoids, and the manner of force transmission;
- joint hypermobility, ligamentous laxity, or a constitutionally wide forefoot;
- gastrocnemius contracture and limitation of ankle dorsiflexion, increasing the load on the forefoot;
- toe deformities, especially hammer toes and claw toes, combined with subluxation of the metatarsophalangeal joints;
- differences in the length and alignment of the metatarsal bones, consequences of injuries, and degenerative changes;
- weakness of the short muscles of the foot, impairing toe stabilization and arch control during gait;
- footwear with a narrow toe box or high heels, which shifts the load forward and restricts the natural spreading of the toes.
Transverse flatfoot is sometimes part of a complex dysfunction of the entire limb. Rearfoot alignment, ankle mobility, knee and hip control, body weight, gait pattern, and the nature of physical activity may all be of significance.
Transverse flatfoot - what symptoms does it cause
The most common symptom is metatarsalgia, which is pain in the plantar surface of the forefoot around the metatarsal heads. The discomfort usually intensifies during prolonged standing, brisk walking, running, and walking in high-heeled shoes. Patients describe burning, a feeling of pressure, the sensation of a pebble in the shoe, or pinpoint pain when pushing off the ground.
Possible consequences of overload include:
- broad, yellowish calluses under the metatarsal heads;
- deep, pinpoint painful corns;
- a feeling of fatigue and tension in the forefoot;
- widening of the forefoot and difficulty in selecting footwear;
- hallux valgus, hammer toes, or claw toes;
- inflammation of bursae and periarticular tissues;
- overload of the plantar plate stabilizing the metatarsophalangeal joint;
- toe instability, its elevation or deviation;
- disruption of the smooth rollover of the foot during gait.
Forefoot pain requires differentiation from Morton's neuroma, stress fractures, Freiberg-Köhler disease, arthritis, gout, peripheral neuropathy, verrucous lesions, and fat pad atrophy. Numbness or burning radiating to the toes suggests nerve involvement. Swelling, redness, sudden severe pain, a wound, sensory disturbances, or the inability to bear weight on the foot require medical consultation.
At Ambasada Urody, procedures supporting the care and offloading of lesions associated with forefoot overload are available:
- podological consultation and foot examination;
- specialized basic podological treatment;
- removal of calluses and excessive hyperkeratosis;
- removal of corns;
- ready-made and individually fitted podological orthoses and pressure reliefs, including silicone elements;
- podological dressings with offloading, when the condition of the skin requires it;
- medical diabetic pedicure for people with diabetes and an increased risk of skin damage.
Podological treatments reduce the effects of local pressure, but the fundamental correction of the overload mechanism requires concurrent footwear selection, offloading, rehabilitation, or orthopedic treatment.
Transverse flatfoot - who is most commonly affected
Symptoms are more common in women, especially with coexisting hallux valgus and long-term use of footwear that narrows the forefoot. The frequency of symptoms increases with age, as tissue elasticity, muscle strength, and the thickness of the fat pad cushioning the metatarsal heads decrease.
Groups at increased risk include:
- individuals performing standing work;
- runners, dancers, and athletes in disciplines requiring frequent jumping;
- individuals who are overweight or have experienced rapid weight gain;
- pregnant women, when body weight and ligament laxity increase;
- patients with hallux valgus, hammer toes, or a high longitudinal arch;
- individuals with rheumatoid arthritis and other inflammatory diseases;
- patients with diabetes, neuropathy, or circulatory disorders;
- individuals following forefoot injuries and surgeries;
- patients with generalized joint laxity or connective tissue diseases.
In children, a wide or seemingly flat forefoot may represent a developmental variant. Insoles and exercises are then selected based on symptoms and a functional examination, rather than solely on the appearance of the foot.
Transverse flatfoot - how to choose insoles
The insole should reduce pressure under painful metatarsal heads, improve walking comfort, and work well with footwear. Its purpose is to modify loading rather than recreate an ideal foot shape. Studies indicate that contoured insoles, cushioning materials, and metatarsal pads can reduce pressure under the central metatarsal heads, although patient response remains individual.
The selection includes an assessment of:
- the location of pain, calluses, and corns;
- mobility of the big toe, metatarsophalangeal joints, and the ankle joint;
- heel alignment and first ray function;
- strength of the intrinsic foot muscles;
- gait pattern and footwear wear;
- neurological, vascular, rheumatological, and metabolic diseases.
The metatarsal pad should be positioned proximally, that is, just behind the metatarsal heads. This placement elevates the bone shafts and increases the contact area of the forefoot with the insole. Placing the pad directly under a painful head may increase pressure. Proper positioning is indicated by improved comfort and the absence of new skin irritation points.
Footwear intended for insoles should have a wide toe box, a stable heel counter, sufficient depth, and a sole that facilitates roll-over. The insole should be introduced gradually, monitoring the skin after each use. Increasing pain, blisters, numbness, or redness persisting after removing the footwear indicate the need for adjustment. In patients with diabetes, neuropathy, or ischemia, specialist supervision is particularly important.
Transverse flatfoot - strengthening exercises
Exercises support the active stabilization of the foot arches, toe control, and push-off quality. The best results are achieved with a program selected by a physiotherapist after an assessment of the entire limb. Training should be regular, precise, and free of acute pain.
Short foot exercise
With the foot resting on the ground, gently draw the head of the first metatarsal bone toward the heel, maintaining contact of the heel, the base of the big toe, and the base of the little toe with the ground. The toes remain elongated. The tension is held for a few seconds.
Toe spreading
The foot rests flat. The big toe moves medially, and the other toes move slightly outward. The exercise develops control of the abductor and interosseous muscles.
Big toe press
The big toe presses into the ground or a thin band, while the other toes remain relaxed. The movement strengthens the first ray mechanism, which is important during the push-off phase.
Heel raises
From a standing position, perform a slow heel raise with an even load distributed between the base of the big toe and the little toe. The knees and heels are guided axially. Initially, hand support can be helpful.
Calf muscle stretching
Stretching is performed first with a straight knee, and then with a slightly bent knee. The heel remains on the ground, and the foot points forward. Improving ankle dorsiflexion can reduce compensatory overloading of the forefoot.
Balance training
Standing on one leg on a stable surface develops proprioception and control of foot alignment. The difficulty is increased only after mastering the correct technique.
A reasonable routine includes short sets performed several times a week. Movement quality is more important than the number of repetitions. Gripping heavy objects with the toes or intense towel curling can exacerbate flexion alignment of the toes in people prone to hammer toe deformities.
