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Do Flat Feet Cause Bunions?

Flat feet are a condition in and of themselves. However, flat feet also have an impact on future foot health and can lead to other more painful foot conditions. But can flat feet really cause bunions? While it seems unlikely that a toe deformity can be linked to a flat arch, you’d be surprised how interconnected our lower extremities are, especially the feet! Today’s article will explore how flat feet cause bunions, what you can do to prevent them, and how a foot specialist like a chiropodist or podiatrist can provide treatment.

What are Flat Feet? 

Flat feet, or pes planus, occurs when the arches of the feet collapse, causing the entire sole or most of it to contact the ground when standing and walking. For some people, this condition can extend into adulthood from childhood (children have flat feet before the arch forms) when the arch fails to form.

When you have normal arches, they provide an elastic, springy connection between the forefoot and the hindfoot, allowing forces incurred during weight-bearing to be distributed properly. When these arches don’t exist, this mechanism is disrupted, leading to pain and other complications.

What are Bunions? 

Bunions, or hallux valgus, are bony protrusions that form on the inside edge of the first metatarsophalangeal (MTP) joint at the base of the big toe. They develop when pressure causes the big toe to deviate toward the second toe, resulting in a misalignment of the joint.

Common Bunion Causes and Risk Factors:

  • Ill-Fitting Footwear: Wearing the wrong shoes for years is a major risk factor for most foot conditions, especially bunions. Wearing tight, narrow, or high-heeled shoes can exacerbate pressure on the big toe joint, contributing to bunion formation. Your toes need space to splay and rest comfortably!
  • Gender and Age: Women, particularly those over 60, are more prone to developing bunions, generally due to decades spent making poor footwear choices, or possibly due to hormonal influences that affect the ligaments in the foot.
  • Inflammatory Conditions: Diseases like rheumatoid arthritis can cause joint inflammation, which increases stress on the big toe and the risk of bunions.
  • Foot Injuries: Trauma to the foot can alter its mechanics, leading to bunion development.

Flat Feet and Bunions: The Connection  

If you’re not proactive, the shape of your foot arch can have a big impact on our foot health over time. You may know that flat feet can lead to plantar fasciitis, and you may also know that high arches can lead to back pain, but our arch shape can affect us in countless ways. Let’s talk about the science behind why a flat foot can lead to a painful bunion. 

It all boils down to flat feet causing an abnormal gait (walking pattern), and the damage caused by walking with that abnormal pattern for a long period of time.

The structural anomaly of flat feet and barely having an arch, or no arch at all, can significantly impact foot mechanics—particularly during walking. In a typical gait cycle, the foot pronates (rolls inward) to absorb shock and then supinates (rolls outward) to create a rigid lever for propulsion. Individuals with flat feet often experience overpronation, where the foot remains excessively rolled inward during the push-off phase. The altered biomechanics increases pressure on the first MTP joint, leading to instability and misalignment. Over time, this persistent stress can cause the big toe to deviate toward the second toe, resulting in a bunion. 

Moreover, flat feet can lead to muscle imbalances that exacerbate bunion formation. Weakness in the intrinsic foot muscles (a group of tiny muscles inside the foot) and the tibialis posterior muscle (a muscle in your lower leg) compromises arch support, worsening overpronation. This chain reaction places additional strain on the big toe joint, accelerating bunion development. Therefore, the combination of altered foot mechanics and muscle imbalances associated with flat feet plays a significant role in the development and progression of bunions.

Preventing Bunions With Flat Feet

First and foremost, it’s all about the shoes! Selecting footwear that fits properly with a wide toe box and adequate arch support is crucial. A spacious toe box prevents crowding of the toes, reducing pressure on the big toe joint and minimizing the risk of bunion formation. Adequate arch support helps maintain proper foot alignment, distributing weight evenly and alleviating stress on MTP joint. Avoiding high heels and narrow shoes is essential, as they can exacerbate foot misalignment and increase the likelihood of developing bunions.

Incorporating custom orthotics can provide even more arch support if you have flat feet. These orthotics help correct overpronation—which we know now is a common issue—by stabilizing the foot’s movement during the gait cycle and keeping it in neutral alignment. By improving foot alignment, orthotics reduce undue pressure on the big toe joint, reducing your risk of bunion development. 

Lastly, Engaging in specific exercises can strengthen the muscles supporting the foot arch, enhancing stability and function. These exercises should aim to:

  • Strengthen Foot Muscles: Targeting the intrinsic and extrinsic muscles of the foot to provide better support for the arch and improve overall foot stability.
  • Improve Flexibility: Enhancing the range of motion in the toes, feet, and ankles to prevent stiffness and reduce strain on the MTP joint.
  • Enhance Balance and Coordination: Developing proprioception to ensure proper foot placement and gait mechanics, thereby reducing the risk of misalignment.

Regular practice of these exercises can improve foot biomechanics, reduce overpronation, and subsequently lower the risk of bunions. See below for an example of a great flat foot exercise.

Foot Clinic Bunion Care

If you already struggle with bunions and foot pain, don’t worry; there are plenty of options available to you. 

Bunions cannot be reversed after they form, but they can be managed with guided care from a podiatrist or chiropodist. The goal is to avoid invasive surgical intervention while still preventing bunions from impacting your daily life as much as possible. Most of these bunion treatment options are available at our downtown Toronto foot clinic

  • Footwear Modification. Wearing shoes with a wide toe box and avoiding high heels can help reduce pressure on the bunion. Orthopedic shoes designed to accommodate bunions provide additional support and comfort. 
  • Anti-inflammatory Medication. Over-the-counter NSAIDs, such as ibuprofen, can help reduce inflammation and alleviate pain associated with bunions. 
  • Bunion Splints and Aligners. Devices like bunion splints and toe spacers can help realign the big toe and reduce discomfort. They can provide symptomatic relief, and you can try a more rigid device if your bunion is severe. 
  • Therapeutic Taping. Applying tape to the foot can help maintain proper alignment and reduce strain on the bunion, providing temporary relief from pain and inflammation. 
  • Shoe Stretching. Professional shoe stretching can create additional space in the shoe, reducing pressure on the bunion without altering the overall size of the footwear. 
  • Supportive Insoles or Custom Orthotics. Custom orthotics can provide support to the arches and correct faulty biomechanics. This can potentially slow the progression of bunions by reducing pressure on the first MTP joint. 
  • Bunion Exercises. Strengthening foot muscles through specific exercises can improve joint stability and decrease bunion-related pain. Try these 5 simple exercises for bunions
  • Shockwave Therapy: This non-invasive treatment can address tight muscles and soft tissue injuries associated with bunions. This can potentially reduce pain and improve function. 

Implementing these non-surgical interventions can significantly alleviate discomfort and slow the progression of bunions, enhancing overall foot health and quality of life.

Take Your First Step Towards Happy and Healthy Feet!

If you’re struggling with flat foot pain, bunions or both, give Feet First Clinic a try! Our Toronto chiropodists are waiting to get your feet feeling their best again. Call Feet First Clinic at (416) 769-3338 or book an appointment with a foot care professional here!

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Carolina Charles

Patient Relation Coordinator (She/Her)

If you’ve been to the clinic before, chances are you had the pleasure of meeting Carolina! Carolina’s daily goal is going above and beyond to make sure patients are always completely satisfied. Having worked in the podiatry industry for 22 years, Carolina brings a wealth of knowledge pertaining to client service, insurance policies, and procedures.​ She steers the ship to make sure everything runs smoothly on the daily. Carolina is known for spicing up every outfit with her signature costume jewellery.