If you’re a runner, you know how important it is to keep your lower body in top shape. Unfortunately, injuries can still happen despite your best efforts. One common injury that affects runners is peroneal tendonitis. This condition occurs when the peroneal tendons, which run along the outside of your ankle, become inflamed.
Peroneal tendonitis can be a painful and frustrating injury, but it’s important to understand what causes it and how to treat it. The peroneal tendons are responsible for stabilizing your ankle and foot, so any repetitive stress or overuse can lead to inflammation. This is why runners, who put a lot of strain on their lower legs, are particularly susceptible to this injury. Symptoms of peroneal tendonitis include pain and tenderness along the outside of the ankle, swelling, and difficulty moving the foot and ankle.
If you’re dealing with peroneal tendonitis, it’s important to take steps to manage your symptoms and prevent further injury. Rest, ice, and elevation can help reduce pain and swelling, while physical therapy can help improve strength and flexibility in the affected area. In some cases, surgery may be necessary to repair the damaged tendons. With the right treatment and care, however, most runners are able to recover from peroneal tendonitis and get back to their regular training routine.
Peroneal Tendon Anatomy
The peroneal (or fibular) tendons are two structures located on the outer aspect of the lower leg, behind the fibula bone. These tendons belong to the peroneal muscles, namely the peroneus longus and the peroneus brevis. The peroneus longus tendon starts at the upper portion of the fibula, goes around the outer ankle bone, and inserts into the underside of the foot. The peroneus brevis tendon, on the other hand, courses along the lower part of the fibula, behind the outer ankle bone, and attaches at the base of the fifth metatarsal on the outside of the foot.
These tendons play a critical role in stabilizing the foot and ankle and help with eversion (moving the foot outward) and plantar flexion (moving the foot downward). They also play a key role in supporting the arch while walking and running.
Peroneal tendonitis typically arises due to overuse or acute injury, leading to inflammation and degeneration of one or both of these tendons. This condition most frequently occurs in individuals who participate in activities that involve repetitive ankle motion, or in those who have an unusual foot structure or poor footwear.
The most common location for peroneal tendonitis is where the tendons course behind the lateral malleolus (the bony bump on the outside of the ankle). This is a relatively narrow space, and repeated rubbing of the tendons against the bone can cause irritation and inflammation over time. Pain and swelling in this area are typically the primary symptoms. In more severe cases, there may be a sensation of instability in the ankle, or even a feeling of the tendons snapping or clicking as they move abnormally due to swelling or damage. Proper diagnosis often involves a combination of physical examination and imaging studies, such as ultrasound or MRI.

Causes of Peroneal Tendonitis in Runners
If you are experiencing pain and swelling on the outside of your ankle, you may have peroneal tendonitis. This condition is common in runners and can be caused by a variety of factors.
Overuse
Overuse is a common cause of peroneal tendonitis in runners. When you run long distances or run frequently without proper rest, your peroneal tendons can become inflamed and irritated. This is especially true if you have recently increased your mileage or intensity.
To prevent overuse injuries, make sure to gradually increase your mileage and intensity. Take rest days and cross-train to give your muscles a break. You can also use foam rollers or massage balls to help alleviate muscle tension and soreness.

Trauma
Trauma can also cause peroneal tendonitis in runners. If you have suffered an ankle sprain or other injury, your peroneal tendons may have been damaged. This can lead to inflammation and pain.
To prevent traumatic injuries, make sure to wear proper shoes and ankle braces while running. Strengthening exercises for your calf muscles can also help improve stability and prevent injuries.
Other Factors
Other factors that may contribute to peroneal tendonitis in runners include:
- Running form: If you have poor running form, you may be putting extra stress on your peroneal tendons. Make sure to maintain proper form and avoid overstriding.
- Shoes: Wearing worn-out or improper shoes can also contribute to peroneal tendonitis. Make sure to wear shoes with proper support and cushioning.
- Instability: If you have weak ankles or a history of ankle sprains, you may be more prone to peroneal tendonitis. Strengthening exercises and ankle braces can help improve stability.
- Stress fractures: Stress fractures in the foot or ankle can also cause peroneal tendonitis. If you are experiencing pain and swelling, it is important to see a doctor for an accurate diagnosis.
By understanding the causes of peroneal tendonitis in runners, you can take steps to prevent this painful condition. Make sure to take care of your body and listen to any pain or discomfort you may experience while running.
Symptoms and Diagnosis
If you are a runner experiencing pain and swelling on the outer part of your ankle, you may be suffering from peroneal tendonitis. This condition occurs when the peroneal tendons, which run behind the ankle bone, become inflamed or torn due to overuse or injury.
The most common symptom of peroneal tendonitis is pain on the outer part of the ankle, which may be accompanied by swelling and tenderness. You may also experience weakness in the ankle and difficulty walking or running.
To diagnose peroneal tendonitis, your doctor will perform a physical exam and review your medical history. They may also order imaging tests, such as an MRI scan, to confirm the diagnosis and rule out other conditions, such as a tear in the Achilles tendon or nerve damage.
During the physical exam, your doctor will check for tenderness and swelling around the peroneal tendons, as well as any weakness or instability in the ankle. They may also ask you to walk or run to observe your gait and assess any pain or discomfort.
If you are diagnosed with peroneal tendonitis, your doctor may recommend rest, ice, compression, and elevation (RICE) to reduce inflammation and promote healing. They may also prescribe physical therapy or recommend orthotics or bracing to support the ankle and prevent further injury.
In severe cases, surgery may be necessary to repair a torn peroneal tendon or remove any scar tissue. However, most cases of peroneal tendonitis can be treated successfully with conservative measures, such as rest and physical therapy.
Other Causes of Lateral Ankle Pain In Runners
Aside from peroneal tendonitis, there are other possible causes of lateral ankle pain in runners. Here are some of them:
Lateral Ankle Sprain
A lateral ankle sprain occurs when the ankle twists or rolls outward, causing damage to the ligaments on the outside of the ankle. This type of injury is common in runners, especially those who run on uneven surfaces or wear improper footwear. Symptoms of a lateral ankle sprain include pain, swelling, bruising, and difficulty bearing weight on the affected foot.
Ankle Impingement Syndrome
Ankle impingement syndrome occurs when the soft tissues around the ankle joint become compressed, causing pain and inflammation. This condition is often caused by repetitive stress or overuse, and is common in runners who frequently change direction or perform sudden stops and starts. Symptoms of ankle impingement syndrome include pain, stiffness, and a clicking or popping sensation in the ankle joint.
Cuboid Syndrome
Cuboid syndrome is a condition that occurs when the cuboid bone in the foot becomes displaced, causing pain and inflammation in the lateral ankle. This condition is often caused by overuse or repetitive stress, and is common in runners who have flat feet or wear shoes with inadequate arch support. Symptoms of cuboid syndrome include pain and tenderness on the lateral side of the foot, and difficulty bearing weight on the affected foot.
Stress Fracture
A stress fracture is a small crack in a bone that occurs as a result of repetitive stress or overuse. This type of injury is common in runners, especially those who increase their training intensity too quickly or run on hard surfaces. Symptoms of a stress fracture include pain, swelling, and tenderness in the affected area, and pain that worsens with activity and improves with rest.
Tarsal Tunnel Syndrome
Tarsal tunnel syndrome is a condition that occurs when the tibial nerve in the ankle becomes compressed, causing pain, numbness, and tingling in the foot and ankle. This condition is often caused by overuse or repetitive stress, and is common in runners who wear shoes with inadequate arch support or have flat feet. Symptoms of tarsal tunnel syndrome include pain, numbness, and tingling on the lateral side of the foot and ankle, and difficulty bearing weight on the affected foot.
Overall, if you experience lateral ankle pain as a runner, it is important to seek medical attention to determine the underlying cause and receive appropriate treatment.
Treatment Options
When it comes to treating peroneal tendonitis, there are several options available to you. The following sub-sections will discuss some of the most common treatment options.
Rest and Ice
One of the most important things you can do to treat peroneal tendonitis is to rest the affected area. This means avoiding any activities that put stress on your peroneal tendons, such as running. You should also apply ice to the affected area for 20 minutes at a time, several times a day. This will help reduce inflammation and pain.
Physical Therapy
Physical therapy can be very effective in treating peroneal tendonitis. A physical therapist can help you develop a rehabilitation program that includes stretching, calf raises, and other exercises to help strengthen the muscles in your legs and feet. They may also use ultrasound or other modalities to help reduce inflammation and promote healing.
Myofascial Massage and Trigger Point Therapy
Myofascial release and trigger point therapy are two massage techniques that can be very beneficial for treating peroneal tendonitis. Myofascial release involves applying sustained pressure to the fascia, or connective tissue, surrounding the peroneal tendons. This pressure helps to release tension and promote healing in the affected area. Trigger point therapy involves applying pressure to specific points in the muscles that are causing pain or discomfort. By releasing these trigger points, the muscles can relax and heal more effectively.
When performing myofascial release or trigger point therapy for peroneal tendonitis, it is important to work with a trained and experienced massage therapist. They will be able to identify the specific areas that need to be targeted and apply the appropriate amount of pressure to achieve the desired results. These techniques can be very effective in reducing pain and inflammation associated with peroneal tendonitis, but they should be used in conjunction with other treatments such as rest, ice, and physical therapy exercises.
In addition to reducing pain and inflammation, myofascial release and trigger point therapy can also help improve range of motion and flexibility in the affected area. By releasing tension in the muscles and fascia, these techniques can help improve overall mobility and prevent future injuries. If you are experiencing symptoms of peroneal tendonitis, talk to your healthcare provider about whether myofascial release or trigger point therapy may be a helpful addition to your treatment plan.
Dry Needling for Peroneal Tendonitis
Dry needling for perineal tendonitis specifically targets the peroneal muscles, which are located on the outside of the lower leg and are often implicated in this type of tendonitis. The aim is to stimulate trigger points – areas of knotted or hard muscle – that may be contributing to the inflammation and pain associated with this condition. For this procedure, a trained physiotherapist or healthcare professional will palpate the muscle to identify these points, and then insert a thin, sterile needle directly into them. This can help relieve any muscular tension and alleviate the strain on the tendons.
The physiological mechanisms behind dry needling for peroneal tendonitis are quite fascinating. When the needle is inserted into the trigger point, it can cause a ‘local twitch response’. This is a spinal cord reflex that can often lead to a reduction in muscle tension and pain. Additionally, dry needling has been shown to promote blood flow to the area, thus providing more nutrients and oxygen to facilitate healing. It also helps in the removal of waste products that can accumulate in a chronically tense or injured muscle.
The therapeutic benefits of dry needling for peroneal tendonitis have been corroborated by numerous studies. Many patients report reduced pain and improved function following treatment. While it can be an effective treatment method, it’s essential to note that dry needling is often used in conjunction with other physiotherapy techniques, such as exercises and manual therapy, to ensure a comprehensive approach to treatment. It is important that patients seek treatment from trained and licensed practitioners to ensure the safe and effective application of dry needling techniques.
Dry needling may not be appropriate for everyone. As with any medical procedure, there are potential risks and side effects, such as temporary pain or discomfort at the needle site, bruising, or, rarely, nerve injury. Individuals considering dry needling for peroneal tendonitis should consult their healthcare provider to discuss their specific situation and possible treatment options.
PRP Injections for Peroneal Tendonitis
PRP injections for peroneal tendonitis aim to leverage the body’s natural healing processes to address the inflammation and damage associated with this condition. The peroneal tendons, located on the outside of the lower leg, can often become inflamed or damaged due to overuse or injury. To target this area, a healthcare professional will draw a small amount of the patient’s blood and process it in a centrifuge to separate and concentrate the platelets, which are cells known to play a crucial role in clotting and tissue regeneration. This concentrated platelet-rich plasma is then injected directly into the inflamed or injured peroneal tendon.
The science behind PRP therapy is grounded in the biological properties of platelets. Platelets are not only essential for clotting but are also a rich source of growth factors – proteins that stimulate cell proliferation, differentiation, and healing. When PRP is injected into the area of tendonitis, these growth factors can stimulate the repair of tissue at a cellular level, promoting healing and reducing inflammation. As PRP is derived from the patient’s own blood, it also has the advantage of minimizing risks associated with immune reactions or disease transmission.
Clinical studies have shown promising results for the use of PRP injections in treating peroneal tendonitis. Patients often report reduced pain, increased function, and improved quality of life after treatment. However, as with any treatment method, it’s essential to note that PRP is often utilized as part of a comprehensive treatment plan that may also include physiotherapy, lifestyle modifications, and other treatments to maximize the overall effectiveness.
Despite the potential benefits, PRP treatment may not be suitable for everyone. While generally considered safe, there are potential risks and side effects to consider, such as pain at the injection site, infection, or potential damage to surrounding structures. Therefore, individuals considering PRP for peroneal tendonitis should consult with a healthcare provider to evaluate their specific situation and consider all available treatment options.
Medication and Cortisone Injection
Medications such as nonsteroidal anti-inflammatory drugs (NSAIDs) can help reduce pain and inflammation. In some cases, a cortisone injection may be recommended to help reduce inflammation and pain.
Surgery
In severe cases of peroneal tendonitis, surgery may be necessary. This may involve repairing or removing damaged tissue, or repositioning the tendons to reduce stress on them.
Overall, the key to treating peroneal tendonitis is to rest the affected area and seek professional medical advice. With the right treatment plan, most people are able to recover fully from this condition.
Prevention and Rehabilitation
Prevention
To prevent peroneal tendonitis, it is crucial to maintain proper running form and gradually increase your running volume and speed. Here are some tips to help prevent peroneal tendonitis:
- Wear appropriate running shoes that provide adequate support and cushioning.
- Use orthotics if necessary to correct any foot imbalances or abnormalities.
- Warm up properly before running, including stretching and calf raises.
- Gradually increase your running volume and speed to avoid overuse injuries.
- Incorporate cross-training and low-impact activities, such as aqua jogging or swimming, into your routine to reduce the amount of weight-bearing activity.
- Consider high-intensity interval training to improve your overall fitness and reduce the risk of injury.
Rehabilitation
If you do experience peroneal tendonitis, it is essential to seek medical attention and follow a rehabilitation program to prevent further injury. Here are some rehabilitation techniques that can help:
- Strengthening exercises: Focus on strengthening the muscles around the ankle, such as the calf muscles and the peroneal muscles. Use resistance bands or weights to increase the intensity of the exercises.
- Balance and stability exercises: Use a wobble board or balance cushion to improve your balance and stability, which can help prevent future injuries.
- Stretching: Stretch the calf muscles and the peroneal muscles to improve flexibility and reduce tension.
- Gradual return to running: Start with low-impact activities, such as walking or cycling, and gradually increase your running volume and speed as your symptoms improve.
- Use of running shoes and orthotics: Consider changing your running shoes or using orthotics to correct any foot imbalances or abnormalities that may have contributed to your injury.
- Cross-training and low-impact activities: Incorporate cross-training and low-impact activities, such as aqua jogging or swimming, into your routine to reduce the amount of weight-bearing activity.
Remember to listen to your body and seek medical attention if you experience any pain or discomfort. With proper prevention and rehabilitation techniques, you can reduce your risk of peroneal tendonitis and continue to enjoy running.
Risks and Complications
When dealing with peroneal tendonitis, it’s important to be aware of the potential risks and complications that may arise. Here are some things to keep in mind:
- Chronic tendonitis: If left untreated, peroneal tendonitis can become a chronic condition that is more difficult to treat. Chronic tendonitis may require more aggressive treatment options, such as surgery or long-term physical therapy.
- Acute injury: In some cases, peroneal tendonitis can lead to an acute injury, such as a tear in the tendon. This type of injury may require immediate medical attention, and surgery may be necessary to repair the damage.
- Scar tissue: Scar tissue can form as a result of peroneal tendonitis, which can further impede the healing process and make it more difficult to treat the condition.
- Achilles tendonitis: Peroneal tendonitis can also lead to Achilles tendonitis, as the two tendons are closely connected. This can cause pain and discomfort in the back of the ankle and heel.
- Plantar fasciitis: Peroneal tendonitis can also lead to plantar fasciitis, which is inflammation and pain in the plantar fascia, a band of tissue that runs along the bottom of the foot. This can cause pain in the heel and arch of the foot.
- Shin splints: If left untreated, peroneal tendonitis can also lead to shin splints, which is pain in the front of the lower leg. This can make it difficult to run or engage in other physical activities.
- Fifth metatarsal: Peroneal tendonitis can also cause pain and discomfort in the fifth metatarsal, which is the bone that connects the little toe to the ankle.
If you are experiencing any of these complications, it’s important to seek medical attention from a podiatrist or physiotherapist. They can help you develop a treatment plan that is tailored to your specific needs and help you get back to running pain-free.
The Finish Line
Congratulations! You have made it to the finish line of your race. You trained hard, pushed yourself to the limit, and achieved your goal. However, if you are experiencing pain on the outside of your ankle, you may be suffering from peroneal tendonitis. This is a common injury among runners, but it can be treated with proper care and attention.
First, it is important to rest and allow your body to heal. Continuing to run on an injured ankle can worsen the condition and lead to more serious problems. You may need to take a break from running for a few days or even a few weeks, depending on the severity of your injury.
In addition to rest, you can also use ice and compression to reduce swelling and pain. Apply ice to the affected area for 20 minutes at a time, several times a day. Use compression bandages or wraps to support your ankle and prevent further injury.
Stretching and strengthening exercises can also help improve your condition. Consult with a physical therapist or coach to learn exercises that are appropriate for your injury and fitness level. They may recommend exercises such as ankle circles, calf raises, and resistance band exercises to help you recover.
Finally, consider changing your running shoes or adjusting your running form to prevent future injuries. Worn-out shoes or improper form can put unnecessary stress on your ankles and lead to peroneal tendonitis. Invest in a good pair of running shoes and work with a coach or trainer to improve your technique.
In conclusion, peroneal tendonitis can be a painful and frustrating injury for runners. However, with proper care and attention, you can recover and get back to running. Remember to rest, use ice and compression, do stretching and strengthening exercises, and consider changing your shoes or form to prevent future injuries. Good luck on your next race!