Flat Feet You Were Born With vs. Arches That Fall

Plenty of people have naturally flat feet their whole lives without any trouble. That is different from an arch that gradually collapses in adulthood. When a foot that used to have a normal arch starts to flatten, it is often a sign that the structures holding the arch up are wearing out. This is commonly called adult acquired flatfoot, and it tends to get worse over time if it is ignored.

Why Adult Arches Collapse

The most common cause is a problem with the posterior tibial tendon, which runs along the inside of the ankle and helps support the arch. When this tendon becomes inflamed, stretched, or torn, it can no longer hold the arch up as well. Ligaments in the foot can then stretch out too. Other contributors can include arthritis, an old injury, and conditions that affect the nerves or soft tissues of the foot.

Because it usually develops slowly, many people do not connect the dots until the shape of the foot has clearly changed. Often a spouse or friend notices it first, or someone realizes the inside of one ankle has been sore for months and the arch on that side looks lower than the other.

Signs Your Arch May Be Falling

• Pain and swelling along the inside of the ankle and arch
• An arch that looks lower than it used to, especially compared with the other foot
• The heel tilting outward when you stand
• Difficulty standing up on your toes on one foot
• Shoes wearing unevenly or no longer fitting the same way
• Later on, pain on the outside of the ankle as the foot shifts

Treatment Depends on the Stage

Early on, when the foot is still flexible, treatment usually focuses on supporting the arch and resting the tendon. That can include supportive shoes, arch supports or bracing, a period of protection in a boot, activity changes, and physical therapy to strengthen the muscles around the foot and ankle. Caught early, many patients get meaningful relief this way.

When the deformity progresses, becomes rigid, or does not respond to conservative care, reconstruction may be considered. In general, flatfoot reconstruction can involve repairing or rebalancing tendons, realigning bones, or, in advanced cases with arthritis, fusing joints in the hindfoot. The plan is individual. It depends on how flexible the foot still is, whether arthritis is present, and what you want to get back to doing.

Flat foot deformities, foot reconstruction, and hindfoot fusion are among the conditions Dr. Wesley Flint treats as a board certified orthopedic surgeon with fellowship training in foot and ankle surgery. His approach is to present every reasonable option so you can make an informed choice.

Why Early Evaluation Matters

Adult flatfoot is easier to manage when it is caught before the foot becomes stiff. An exam, standing X-rays, and sometimes additional imaging help show what is happening with the tendon, ligaments, and joints. From there, you can decide on next steps with a clear picture of where things stand.

Fall and winter can be a practical time to start. Many people are less active outdoors, which makes it easier to rest a sore tendon or wear a brace before spring hiking and biking season returns.

If your arch seems to be changing or the inside of your ankle aches after a day on your feet, schedule an appointment with Flint Foot & Ankle Institute. We see patients from Boise and throughout the Treasure Valley, as well as across Idaho and Eastern Oregon, and we will help you find a treatment path that fits your life.