Understanding Foot and Ankle Tendons

The foot and ankle contain more than 100 muscles, tendons and ligaments that work together to support body weight and enable walking, running and balance. Key tendons involved in foot and ankle stability include:

• Peroneal tendons along the outer ankle, which run behind the outer ankle bone and help stabilize the lateral side of the foot
• Posterior tibial tendon along the inner ankle and arch, which turns sharply around the medial malleolus, an area prone to increased tension and degeneration
• Anterior and posterior tibial tendons, which control foot position and motion
• Flexor hallucis longus and flexor digitorum longus, which flex the big toe and lesser toes and are often considered in tendon transfer procedures

The medial arch and medial forefoot are critical for foot stability, with the spring ligament and surrounding soft tissue structures providing essential support. The heel bone also plays a key role in overall foot alignment and stability.

Damage to these structures can disrupt normal biomechanics, leading to pain, instability or progressive deformity if left untreated.

Common Causes of Foot and Ankle Tendon Injuries

Tendon injuries may develop suddenly or gradually and are often caused by a combination of mechanical stress and underlying risk factors, including:

• Overuse or repetitive activity
• Sudden increases in activity or training intensity
• Ankle sprains or traumatic injuries
• Poor footwear or inadequate support
• Flatfoot or high-arch foot structure
• Age-related tendon degeneration
• Obesity, diabetes or inflammatory arthritis
• Hypertension

Posterior tibial tendon dysfunction (PTTD) is a leading cause of adult-acquired flatfoot deformity and involves failure of the posterior tibial tendon and associated ligaments and joints on the medial side of the foot and ankle.

Additional contributing factors include genetic predisposition, increased body mass index and metabolic conditions. Structural changes within the tendon, including altered collagen composition and increased stiffness, can reduce healing potential and contribute to chronic degeneration.

Early evaluation is important, as untreated tendon injuries can worsen over time.

Peroneal Tendon Injuries

What Are Peroneal Tendon Injuries?

The peroneal tendons run along the outer side of the ankle and foot and help stabilize the ankle during walking and athletic movement. Injury to these tendons may involve inflammation, tearing or tendon subluxation.

Symptoms of Peroneal Tendon Injury

• Pain or swelling along the outside of the ankle
• Ankle instability or repeated ankle sprains
• A popping or snapping sensation behind the ankle bone
• Weakness during walking or activity

Treatment Options

Non-surgical treatment options may include rest, ice, compression and elevation, along with physical therapy. Bracing, activity modification and nonsteroidal anti-inflammatory medications may also be recommended. Surgery may be considered for persistent pain, significant tears or instability that does not improve with conservative care.

Posterior Tibial Tendon Dysfunction (PTTD)

What Is Posterior Tibial Tendon Dysfunction?

The posterior tibial tendon runs along the inside of the ankle and is a primary support structure for the foot’s arch. Posterior tibial tendon dysfunction occurs when this tendon becomes inflamed, overstretched or torn, leading to progressive flattening of the foot.

Symptoms of PTTD

• Pain and swelling along the inside of the ankle or arch
• Progressive flattening of the foot
• Difficulty standing on tiptoes
• Outward rolling of the ankle
• Increasing pain with walking or activity

PTTD is one of the most common causes of adult-acquired flatfoot deformity.

Stages of PTTD

• Stage I: Tendon inflammation without deformity
• Stage II: Arch collapse with flexible deformity
• Stage III: Rigid flatfoot with joint stiffness
• Stage IV: Ankle joint involvement and arthritis

Treatment Options

Early-stage PTTD is often managed with conservative treatment, including activity modification, orthotic devices, physical therapy and temporary immobilization. Imaging studies such as X-rays and MRI help evaluate disease severity and soft tissue involvement.

If conservative treatment fails or deformity progresses, surgical intervention may be required. Procedures may include tendon reconstruction, bone realignment or joint fusion. In selected cases, Achilles tendon lengthening may be performed to relieve tightness, with careful consideration of potential risks.

Tibial Tendon Injuries and Related Disorders

Tibial tendon injuries may involve the anterior or posterior tibial tendons and can affect foot positioning, gait mechanics and balance. These injuries may result from overuse, trauma or chronic degeneration.

Symptoms may include:

• Pain along the front or inner ankle
• Weakness with foot motion
• Changes in foot alignment
• Difficulty walking on uneven surfaces

Treatment depends on severity and may include immobilization, orthotics, physical therapy or surgical repair when necessary.

Tendon Rupture

Tendon rupture is a serious complication that may occur due to chronic degeneration or acute injury. Rupture of the posterior tibial tendon can significantly compromise arch support and foot stability, often leading to progressive deformity and functional limitation.

How Tendon Injuries Are Diagnosed

Accurate diagnosis is essential for effective treatment. OrthoTexas specialists perform a comprehensive evaluation that may include:

• Detailed medical history and symptom review
• Physical examination of foot alignment and tendon strength
• Gait analysis and functional testing
• Imaging studies such as X-ray, ultrasound or MRI to assess tendon integrity and joint involvement

MRI is particularly useful for evaluating soft tissue injury and determining the severity of posterior tibial tendon dysfunction.

Non-Surgical Treatment Options

Conservative treatment is often the first step and may include:

• Rest and activity modification
• Immobilization with a walking boot or brace
• Custom orthotics for arch support and alignment
• Physical therapy to restore strength and flexibility
• Anti-inflammatory medications or targeted injections when appropriate

When Surgery May Be Recommended

Surgery may be considered when tendon injuries cause persistent pain, instability or deformity that does not respond to non-surgical care. Surgical goals include restoring tendon function, correcting alignment and preventing further joint damage.

Procedures may involve tendon repair or reconstruction, tendon transfer or bone realignment. In advanced cases, multiple procedures may be performed to restore proper foot alignment and function.

Recovery and Rehabilitation

Recovery timelines vary based on injury severity and treatment approach. Rehabilitation typically includes:

• Gradual return to weight-bearing
• Physical therapy to improve strength and mobility
• Gait training and balance exercises
• Ongoing follow-up to monitor healing

Adhering to a structured rehabilitation plan is critical for long-term success.

Expert Tendon Injury Care at OrthoTexas

Tendon injuries of the foot and ankle can significantly affect movement, stability and quality of life if left untreated. The foot and ankle specialists at OrthoTexas provide comprehensive diagnostic expertise and individualized treatment plans for peroneal, posterior tibial and tibial tendon injuries.