Sinus Tarsi Syndrome Explained: Symptoms & Treatments

Sinus tarsi syndrome is inflammation or injury within a small tunnel between the ankle and heel bone that often develops after an ankle sprain or chronic ankle instability. When this happens, people can usually walk straight ahead without much discomfort, yet turning, walking on uneven ground, or exercising causes sharp pain along the outside of the ankle.

Because up to 80% of lateral ankle sprains involve injury to the ligaments that help stabilize the outer ankle, lingering instability can contribute to chronic pain conditions like sinus tarsi syndrome if not properly treated. Rather than simply masking symptoms with over-the-counter anti-inflammatories, finding the best foot and ankle surgeon in Los Angeles to treat the underlying cause is essential for lasting relief. Read on to learn more about the symptoms and treatments for sinus tarsi syndrome.

Understanding the Causes of Sinus Tarsi Syndrome

The sinus tarsi is a small space located on the outside of the foot between the talus and calcaneus. Although it is relatively small, it contains important ligaments, blood vessels, fatty tissue, and nerve endings that help stabilize the ankle and provide balance. When these structures become injured or inflamed, every step can become painful. With this condition, many patients describe:

• Pain just below the outside ankle bone
• Tenderness when pressing on the area
• A feeling that the ankle "gives out"
• Difficulty walking on uneven surfaces
• Pain when pivoting or changing direction

How Do You Develop Sinus Tarsi Syndrome?

This ankle condition most commonly develops after an ankle sprain. Even if the ligaments partially heal, lingering instability allows excessive movement within the sinus tarsi. That repeated irritation causes chronic inflammation and pain. Less commonly, sinus tarsi syndrome can occur because of:

• Flat feet
• Arthritis
• Repetitive athletic activity
• Previous fractures
• Inflammatory arthritis
• Scar tissue following injury

How to Know If You Have Sinus Tarsi Syndrome vs. An Ankle Injury

A careful physical examination from the best podiatrist in Los Angeles provides the best answers, because they can evaluate ankle stability, ligament integrity, foot alignment, gait mechanics, and the exact location of ankle pain or tenderness. 

Certain movements that reproduce pain inside the sinus tarsi can strongly suggest the diagnosis. They can also order imaging to help rule out other conditions. Depending on your symptoms, a visit to the podiatrist may include:

• Digital X-rays
• MRI to evaluate soft tissues
• Ultrasound examination
• CT scan for complex anatomy
• Diagnostic injection into the sinus tarsi

One particularly useful diagnostic tool is a local anesthetic injection. If pain disappears immediately after numbing the sinus tarsi, it confirms that this small area is the true pain generator rather than another structure in the ankle.

Advanced Treatments That Help Sinus Tarsi Syndrome Heal

Treatment for sinus tarsi syndrome depends on why the inflammation developed in the first place. Fortunately, most patients improve without surgery. Initial treatment options usually include:

• Activity modification
• Anti-inflammatory medication when appropriate
• Ice therapy
• Physical therapy focused on balance and ankle stability
• Custom orthotics
• Supportive ankle bracing
• Footwear modifications

For patients who continue having symptoms despite conservative care, advanced regenerative treatments can provide additional relief. When clinically appropriate, regenerative treatments can include: 

• Platelet-rich plasma (PRP) 
• Bone marrow aspirate (BMA)

When these conservative treatments don’t work, surgery may become the best solution. Surgical options for sinus tarsi syndrome can include:

• Ankle arthroscopy for minimally invasive removal of inflamed tissue
• Repair of damaged ligaments
• Reconstruction for chronic ankle instability
• Correction of underlying foot alignment problems

Can Sinus Tarsi Syndrome Come Back After Treatment?

One of the biggest frustrations podiatry patients experience is recurring pain. The reason is usually inadequate treatment, meaning the inflammation improves, but the mechanical problem remains. For example:

• Weak ankle stabilizing muscles
• Chronic ligament laxity
• Untreated flat feet
• Poor or ill-fitting footwear
• Returning to sports too quickly

While cortisone injections may reduce inflammation and provide valuable pain relief, they do not correct ankle instability or abnormal biomechanics. Without addressing the underlying cause, symptoms will likely return.

Where to Find the Best Podiatrist in Los Angeles for Sinus Tarsi Treatment

The best way to get lasting relief is to identify the underlying cause of chronic instability. This is why our team at Foot and Ankle Specialty Group makes it our goal to help you return to walking, exercising, and living without persistent ankle pain.

Our team is led by Dr. David Soomekh, who is a board-certified foot and ankle surgeon and Fellow of the American College of Foot and Ankle Surgeons. Dr. Soomekh has advanced expertise in treating complex ankle conditions, sports injuries, arthritis, and reconstructive foot and ankle procedures. He combines careful diagnostic evaluation with the latest treatment options, including regenerative therapies such as platelet-rich plasma (PRP) when appropriate, to create personalized treatment plans that relieve pain, restore stability, and help patients return to their normal activities.

Ready to get the best sinus tarsi treatment in Los Angeles for lasting relief of outer ankle pain?