Foot Conditions Glossary | Colony Ortho RX

Q: How does adult-acquired flatfoot develop if my arches used to be normal?

The medial arch relies on the posterior tibial tendon to hold its height under load. When that tendon weakens or degenerates, it stops supporting the arch, and the arch progressively drops, often with the rearfoot drifting into more pronation. Because it is tendon-driven and progressive, earlier evaluation generally gives you more options.

A Clinical Reference For Foot And Ankle Conditions

Understanding the mechanics behind foot pain is the first step toward addressing it. This glossary collects the conditions, structures, and biomechanical terms we encounter most often at Colony Ortho RX, explained in plain language. It is meant to orient you, not to replace a clinical examination. If any term describes what you are feeling, treat it as a prompt to seek a proper diagnosis rather than a conclusion on its own.

Conditions And Deformities

Accessory navicular syndrome – an extra ossicle near the navicular that, in flatter feet, draws excess tension through the posterior tibial tendon and becomes inflamed. Achilles tendinopathy – degenerative thickening of the Achilles tendon producing pain and stiffness; a complete tear is an Achilles rupture, with sudden loss of push-off strength. Adult-acquired flatfoot – the medial arch drops as the posterior tibial tendon weakens and stops supporting it. Ankle arthritis – cartilage breakdown in the joint, often following an old fracture, while an ankle fracture breaks the tibia or fibula and an ankle sprain overstretches or tears its ligaments. Apophysitis (Sever’s disease) – irritation at the growth plate of a child’s heel. Bunion (hallux valgus) – the first metatarsal drifts out of alignment with the great toe, exposing the bone as a prominent bump. Cavovarus deformity – an excessively high arch paired with an inward-turning heel, frequently neurological in origin. Charcot foot – progressive painless bone collapse in a foot that has lost protective sensation. Hammertoe and mallet toe – flexion deformities of the lesser toe joints. Metatarsalgia – pain across the ball of the foot where the metatarsal heads carry body weight. Morton’s neuroma – a thickened nerve between the third and fourth metatarsals causing burning and tingling, often eased by metatarsal gel offloading. Peroneal tendinopathy – inflammation of the tendons running along the outer ankle.

Key Structures And Movements

Plantar refers to the sole; dorsiflexion is lifting the foot toward the shin. Pronation is the inward roll of the rearfoot that absorbs shock in moderation but overloads the medial soft tissues in excess, while supination shifts weight to the lateral border and is common in high arches. The talus links the leg to the foot at the ankle joint and is vulnerable to poor blood supply after injury. An orthosis is any device worn to support or realign a body part. Supportive arch support can reduce abnormal strain across many of these structures, particularly for people on their feet all day.

Plantar fascia load: the band from heel to toes that supports the arch and inflames under tension, producing plantar fasciitis
Rearfoot alignment: heel position governs whether force tracks through the foot in pronation or supination
Shock attenuation: the fat pad and arch dampen impact at heel strike before load reaches the joints above
Shin splints: lower-leg pain linked to flat feet and worn, unsupportive footwear
Sesamoids: small bones beneath the first metatarsal that can become irritated under forefoot pressure

Use This As A Starting Point

We assembled these definitions so you can recognize potential foot and ankle issues and speak about them with confidence. Knowledge supports better decisions about your own care, but it is never a substitute for examination. Always confirm any diagnosis with a physician or qualified specialist. If a structured, supportive footbed fits your situation, explore the Colony Ortho RX orthotic insole.

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Frequently Asked Questions

Is reading this glossary enough to figure out what's wrong with my foot?

No. The glossary is meant to orient you to the structures and mechanics behind common foot and ankle complaints, not to replace a clinical examination. If a definition matches what you are feeling, treat that as a reason to pursue a proper diagnosis, since several conditions share similar symptoms but need different management.

What separates Achilles tendinopathy from an Achilles rupture?

Tendinopathy is gradual: the tendon thickens degeneratively and becomes painful and stiff, often building over months of load. A rupture is a complete tear, typically a sudden event with an abrupt loss of push-off strength. The first is a chronic loading problem; the second is an acute injury that needs prompt medical evaluation.

How does adult-acquired flatfoot develop if my arches used to be normal?

The medial arch relies on the posterior tibial tendon to hold its height under load. When that tendon weakens or degenerates, it stops supporting the arch, and the arch progressively drops, often with the rearfoot drifting into more pronation. Because it is tendon-driven and progressive, earlier evaluation generally gives you more options.

Can children get the heel conditions listed here, like Sever's disease?

Yes. Sever’s disease, listed under apophysitis, is irritation at the growth plate of a child’s heel and occurs only in growing feet. Adult heel pain usually traces to different structures, such as the plantar fascia or the calcaneal fat pad, which is why age is one of the first things a clinician weighs when sorting out heel symptoms.