Plantar fascial fibromatosis is a benign condition in which firm nodules grow along the thick band of tissue on the bottom of your foot. Also known as Ledderhose disease, it results from an overgrowth of specific connective tissue cells in the plantar fascia. The condition affects fewer than 200,000 people in the United States and typically appears in middle age, during the 40s and 50s. While the nodules are not cancerous, they can become painful enough to interfere with walking and standing.
What Happens Inside the Foot
The plantar fascia is a tough band of tissue that runs along the sole of your foot from heel to toes. In plantar fibromatosis, two types of cells, fibroblasts and myofibroblasts, begin multiplying abnormally within this tissue. They produce excess collagen, forming one or more firm lumps embedded in the fascia itself. These nodules most often appear along the arch of the foot.
Unlike Dupuytren’s contracture, a related condition that affects the hand and gradually curls the fingers inward, plantar fibromatosis rarely causes the toes to contract. The nodules may stay small and painless for years, or they may slowly enlarge and press against surrounding structures, making weight-bearing uncomfortable. About 25% of people with the condition develop nodules in both feet.
Who Gets It and Why
Men are twice as likely as women to develop plantar fibromatosis, and most cases show up between ages 30 and 50, though it has been reported in children as young as 9 months. The exact cause remains unclear, but several risk factors stand out: diabetes, epilepsy (particularly in people taking certain anticonvulsant medications), chronic alcohol use, and liver disease all raise the likelihood.
There appears to be a hereditary component. Plantar fibromatosis belongs to the same family of connective tissue overgrowth disorders as Dupuytren’s contracture of the hand and Peyronie’s disease. About 15% of people with Dupuytren’s contracture also develop plantar nodules, and roughly 4% of those with Peyronie’s disease have it as well. Prior trauma to the foot, frozen shoulder, and underlying changes in collagen structure have also been identified as possible contributing factors.
What It Feels Like
The hallmark sign is one or more firm lumps on the bottom of your foot, usually along the inner arch. Early on, many people notice the nodule only when pressing on it or walking barefoot on a hard surface. As nodules grow, the pressure of body weight against the lump can produce a deep, aching pain with every step. Some people describe the sensation as walking on a marble lodged under the skin.
Pain tends to worsen with prolonged standing, walking, or wearing shoes with thin, flat soles. The nodules themselves feel rubbery to firm and are typically fixed to the underlying fascia rather than moving freely under the skin. Multiple nodules in the same foot are common and have been associated with a more stubborn course.
How It’s Diagnosed
A physical exam is often enough to suspect plantar fibromatosis, but imaging helps confirm it and rule out other possibilities. On ultrasound, the nodules appear as darker masses sharply contrasting with the brighter plantar fascia around them. A distinctive pattern called the “Comb Sign,” visible in about half of cases, shows alternating light and dark bands within the nodule, resembling the teeth of a comb.
MRI provides a more detailed picture. Plantar fibromas show up as oval or lobulated areas of tissue disruption embedded in the fascia. Because the nodules are mostly fibrous, they tend to appear dark on MRI sequences, though some show a signal similar to muscle tissue. These imaging features help distinguish the condition from other soft tissue masses, including rare malignancies, without requiring a biopsy in most cases.
Conservative Treatment Options
When nodules cause little or no pain, the standard approach is offloading pressure. Padded shoes with soft insoles, or custom-molded orthotics designed to redistribute weight away from the nodule, can make a significant difference. The goal is to keep the nodule from bearing direct pressure during walking. Anti-inflammatory medications, stretching exercises, and ice therapy are commonly used alongside orthotic support to manage discomfort.
Steroid injections into or around the nodule can reduce pain and may temporarily shrink the mass, though the effect often wears off. Topical verapamil, a compound that interferes with collagen production, has been used with the aim of softening nodules, but evidence for its effectiveness is limited.
Radiation Therapy
For nodules that are painful but not yet large enough to warrant surgery, radiation therapy has shown real promise. A prospective clinical trial (the LedRad study) found that radiotherapy produced significant pain reduction and improved quality of life compared to sham treatment. Patients reported the biggest gains in their ability to walk barefoot at speed, which is typically the most painful activity for people with Ledderhose disease.
Side effects were generally mild: skin redness, dryness, and temporary burning sensations. About 95% of reported side effects were graded as mild, and 87% had resolved by 18 months after treatment. Radiation therapy is typically considered when conservative measures have failed but the disease hasn’t progressed to the point of needing surgery.
Surgery and Recurrence Rates
Surgery is reserved for cases where pain is severe and other treatments haven’t worked. The procedure involves removing either the nodule alone, a portion of the plantar fascia, or the entire plantar fascia. The scope of the operation matters enormously for long-term results.
Recurrence is the central challenge of surgical treatment. In long-term follow-up, the overall recurrence rate sits around 60%. Removing just the nodule (local excision) carries the highest recurrence rate, reaching 100% in one study. Total plantar fasciectomy, removing the entire plantar fascia, drops the recurrence rate to about 25% for primary lesions, making it the most effective surgical option. Adding postoperative radiation therapy appears to lower recurrence further, though the evidence is still being evaluated. The presence of multiple nodules in one foot is linked to a higher chance of the condition returning after surgery.
Recovery from fasciectomy can be lengthy. Removing the plantar fascia changes the biomechanics of the foot, and patients should expect a period of rehabilitation and gradual return to full weight-bearing. Because of the high recurrence rates and recovery demands, surgery is genuinely a last resort for this condition.