What Posterior Tibial Tendon Dysfunction Does to the Arch
- Dr. Chandana Halaharvi
- 11 minutes ago
- 3 min read
The Tendon That Holds Up the Arch
An arch that flattens in adulthood is not simply a cosmetic change or an inevitable part of aging. In most cases it signals that a specific tendon has begun to fail, and the condition follows a predictable course that becomes progressively harder to treat at each stage.
The posterior tibial tendon originates from a muscle deep in the calf, travels behind the inner ankle bone, curves under the foot, and attaches primarily to the navicular bone in the arch. It is the principal dynamic support of the medial arch.
Its role is most evident during walking. Each time the heel lifts, the tendon contracts to invert the foot and lock the midfoot bones into a rigid lever, allowing an efficient push off. Without that locking action, the foot stays flexible when it should be stiff, and propulsion becomes inefficient and painful.
The tendon has a region of relatively poor blood supply just behind and below the inner ankle bone, and this is where degeneration typically begins. Contributing factors include obesity, diabetes, hypertension, inflammatory arthritis, prior trauma, and simply years of cumulative load, with women over forty most commonly affected.
Early symptoms are easy to dismiss. Pain and swelling along the inside of the ankle and arch, worse after standing or walking, sometimes with a sense that the foot tires quickly. Many patients attribute it to a strain and wait months before seeking evaluation.
How the Condition Progresses in Stages
In stage one the tendon is inflamed or mildly degenerated but the arch shape is still normal. This is the stage where treatment is most effective, and it is also the stage most often missed. Immobilization, orthotics, and targeted strengthening frequently resolve the problem here.
In stage two the tendon has elongated and the arch has begun to flatten, but the deformity remains flexible, meaning the arch can still be restored passively. The heel drifts outward, and viewed from behind, more toes become visible on the outer side of the affected foot than the other. This too many toes sign is a useful marker.
Patients throughout Sugar Land, Pearland, and the greater Houston area come to Thrive Foot and Ankle when the inside of the ankle aches and the arch feels like it is dropping, before the deformity becomes fixed.
Dr. Chandana Halaharvi at Thrive Foot and Ankle evaluates arch collapse in patients across the Houston area with weight bearing imaging and functional testing, so treatment matches the actual stage of the condition.
The single heel rise test is a practical way to assess function. A person with a healthy tendon can rise onto the toes of one foot and the heel swings inward as they do. With significant dysfunction, the heel fails to invert, or the patient cannot complete the rise at all.
In stage three the deformity has become rigid, meaning the joints of the hindfoot have stiffened in the collapsed position and can no longer be manually corrected. In stage four the deformity has progressed upward and the ankle joint itself begins to tilt, which is a substantially more complex problem.
Why Early Treatment Changes Everything
Treatment tracks the stage closely. Stages one and two are managed with a period of immobilization, custom orthotics with substantial medial posting, ankle bracing in some cases, and a specific eccentric strengthening program for the tendon. Weight management meaningfully reduces load on a failing tendon.
Surgical options for flexible deformity typically combine tendon transfer to replace the failed tendon with a bone cut in the heel to realign the hindfoot. Once the deformity is rigid, correction generally requires fusing joints, which is more extensive and permanently limits some motion.
The reason early diagnosis matters so much is that the progression from flexible to rigid represents a fundamental change in what treatment can accomplish. Time is genuinely the variable, and persistent pain along the inside of the ankle deserves evaluation rather than patience.
At Thrive Foot and Ankle, we assess arch pain and flattening early, when treatment is most effective and least invasive. Book an appointment online to have your arch evaluated.
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