Tag: foot orthotics

Supination Resistance

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Supination Resistance is a concept of determining the force needed to supinate the foot. This is considered important in foot orthotic prescribing as it is helpful to determine how much force if needed from the foot orthotic if the foot is overpronating.

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Supination resistance refers to the amount of force required to supinate (invert) the foot around the subtalar joint during gait or clinical testing. It’s a key concept in biomechanics and podiatry, because it helps clinicians understand how easily or how much effort it takes for a person’s foot to resupinate during walking or running. Normally, after the foot pronates during stance phase (to absorb shock and adapt to the ground), it needs to resupinate for effective propulsion. If the foot has high supination resistance, it means a lot of force is required to achieve this motion, potentially leading to inefficient gait mechanics and increased risk for overuse injuries.

Several factors influence supination resistance, including the alignment of the subtalar joint, midtarsal joint mobility, body weight, and even soft tissue flexibility. For instance, individuals with a medially deviated subtalar joint axis often have higher supination resistance because ground reaction forces act more medially, increasing the lever arm for pronatory forces. Conversely, someone with a more laterally placed subtalar axis may have lower resistance. Clinically, high supination resistance is often associated with persistent pronation, flat feet (pes planus), and conditions like posterior tibial tendon dysfunction, while low supination resistance may correlate with rigid high-arched feet (pes cavus) that don’t adapt well to ground surfaces.

Understanding supination resistance is important for treatment planning, especially when prescribing foot orthotics. Patients with high supination resistance may need orthotics that provide more aggressive arch support or medial posting to control pronation. On the other hand, for those with low resistance, excessive correction can actually destabilize the foot. Some clinicians use devices like a supination resistance meter, but often manual testing provides sufficient clinical information. Ultimately, evaluating supination resistance helps personalize interventions, optimize gait, and reduce injury risk.

Most Useful Resources:
https://podiapaedia.org/wiki/biomechanics/clinical-biomechanics/concepts/supination-resistance/ (PodiaPaedia)
https://podiatryarena.com/index.php?articles/supination-resistance.1/ (Podiatry Arena)
https://podiatryarena.com/index.php?tags/supination-resistance/ (Podiatry Arena)
http://www.runresearchjunkie.com/the-concept-of-supination-resistance/ (Running Research Junkie)
http://www.podiatryfaq.com/supination-resistance/ (Podiatry FAQ)
http://www.ipodiatry.org/the-concept-of-supination-resistance/13688 (iPodiatry)

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Kinetic Wedge

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The kinetic wedge is an extension that can be used on the front part of the foot orthotic to assist in the clinical management of of functional hallux limitus.

The Kinetic Wedge is a specialized modification used in foot orthotics, primarily designed to improve the function of the first metatarsophalangeal joint (1st MPJ), which is the big toe joint. It was originally introduced by Dr. Howard Dananberg as a solution for functional hallux limitus—a condition where the big toe has full range of motion when non-weight bearing, but becomes restricted during walking. The wedge works by allowing more unrestricted motion of the first ray (the first metatarsal and associated structures), which helps promote efficient propulsion during gait. This modification typically involves removing material under the first metatarsal head while maintaining support under the lesser metatarsals.

Biomechanically, the Kinetic Wedge helps “free up” the big toe during the push-off phase of walking. Normally, the first ray needs to plantarflex (drop down) to allow proper dorsiflexion (upward movement) of the big toe. When this doesn’t happen due to joint restriction or poor foot mechanics, it can lead to a range of issues like compensatory gait patterns, metatarsalgia, or even plantar fasciitis. The Kinetic Wedge alleviates this by creating a small cutout or depression under the first metatarsal head in the orthotic, which reduces resistance to first ray plantarflexion. This allows the big toe to dorsiflex more freely, facilitating a more efficient and less painful gait.

Clinically, the Kinetic Wedge is often used for patients with functional hallux limitus, forefoot pain, early-stage hallux rigidus, or abnormal propulsion mechanics. It’s not a one-size-fits-all solution, though—it requires proper biomechanical assessment to determine if the patient would benefit from improved 1st ray mobility. When used correctly, patients often report reduced forefoot pressure, improved comfort during walking, and better overall gait mechanics. However, in patients with structural hallux limitus or severe arthritic changes, this modification may be less effective, and alternatives such as rocker soles or more rigid orthotics might be more appropriate.

Most Useful Resources:
Kinetic Wedge (Foot Health Forum)
What is the Kinetic Wedge? (Foot Health Friday)
Kinetic Wedge (Podiapaedia)
Kinetic Wedges: Question (Podiatry Arena)
Kinetic Wedge Threads (Podiatry Arena)
What is a Kinetic Wedge Orthotic? (Podiatry FAQ)
K is for Kinetic Wedge (Podiatry ABC)

 

Cluffy Wedge

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The Cluffy wedge is a pad that is places under the great toe to hold it in a slightly dorsiflexed position. It is designed to treat functional hallux limitus and problems with the windlass mechanism.

The Cluffy Wedge is a trademarked pad designed to sit under the hallux (your big toe), aiming to hold it in a gently dorsiflexed position—that is, lifted upward just enough to get things moving right. Originally developed by Dr. James Clough, DPM, this wedge was first trademarked in 2003 under Cluffy LLC in Polson, Montana, and has also been marketed under the name P4 Wedge.

Functionally, the Cluffy Wedge is all about managing a condition called functional hallux limitus—where your big toe has a normal range of motion when off the ground but gets stuck when you’re weight-bearing. By dorsiflexing the hallux, the wedge preloads the toe so the windlass mechanism (which tightens the plantar fascia during walking) kicks in earlier and more naturally . The theory is sound: first metatarsal loading improves, less strain is placed on the other metatarsals, and the foot’s biomechanics get realigned—at least hypothetically.

On the practical side, you can use the Cluffy Wedge on its own inside shoes, under insoles, or as an extension in custom orthotics. While some podiatric labs initially offered it, most now craft their own versions to achieve the same effect—often by adding padding under the hallux in custom orthotic designs. However, it’s important to note that peer-reviewed clinical trials are lacking, so much of what we have are anecdotal reports, small-scale studies, or theses—not yet full clinical validation.

In short, the Cluffy Wedge stands out as a simple yet biomechanically savvy tool for specific foot dysfunctions, especially functional hallux limitus. While its theoretical benefits—like balancing forefoot pressure and reactivating the windlass mechanism—are appealing, we remain a bit short on robust clinical research. Still, for patients and practitioners looking for non-invasive ways to support hallux mechanics, it’s worth considering, especially if integrated thoughtfully into custom orthotic planning.

Most Useful Resources:
Cluffy Wedge (Foot Health Forum)
Cluffy Wedge (Podiatry Arena)
Cluffy Wedge (Clinical Biomechanics Bootcamp)
Cluffy Wedge (PodiaPaedia)
The Cluffy Wedge (Podiatry Update)
Cluffy Wedge (Podiatry Experts)

Cycling and Foot Orthotics

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Foot orthotics for cycling play an important role in getting the correct interface between the foot, shoe and pedal. It helps with performance, management of injury and prevention of injury.

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Foot pain when cycling can come from a few main culprits: poor bike fit, improper footwear, and overuse injuries. If the cleats are positioned incorrectly—either too far forward, too far back, or angled wrong—they can put excessive pressure on nerves or joints in the foot. Similarly, shoes that are too tight can compress the foot, while shoes that are too loose can allow it to slide and cause friction, leading to hot spots or blisters. Even the type of socks you wear matters—thin, moisture-wicking ones help reduce heat and pressure build-up, while thick or bunching socks can worsen it.

Another common cause is overuse and repetitive stress. Long rides, especially at high intensity, can lead to nerve compression in the ball of the foot, often called “hot foot” (metatarsalgia). This usually feels like burning, tingling, or numbness that gets worse the longer you ride. Riding in very stiff shoes without adequate arch support can also transfer too much vibration from the pedals to your feet, irritating tissues over time. Climbs, high gears, and prolonged standing on the pedals tend to make this worse because they put more load on the forefoot.

To address foot pain, cyclists often start with equipment adjustments. This can include moving cleats slightly back to reduce forefoot pressure, experimenting with insoles that match your arch type, or loosening shoe straps slightly to improve blood flow. Bike fit also plays a role—saddle height and fore-aft position can influence how your weight is distributed through the pedals. Off the bike, stretching and strengthening foot and calf muscles can help prevent recurrence. If pain persists despite these changes, it’s worth seeing a sports physiotherapist or podiatrist to rule out underlying issues such as nerve entrapment, stress fractures, or chronic inflammation.

Most Useful Resources:
Cycling (PodiaPaedia)
Cycling (Podiatry TV)
Cycling Threads (Podiatry Arena)
Cycling (Foot Health Forum)
Cycling Orthotics (Podiatry Arena)
Foot Orthotics and Cycling (Podiatry Update)
Foot problems in cyclists (Foot Health Friday)
Set up of the cycle for injury prevention (Physio Ninja)

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Overpronation

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‘Overpronation’ is generally accepted as being the foot rolling inwards at the ankle or rearfoot joints. There is a lot of controversy about the use of the term; just how much of a risk factor for injury it is; if it should be treated or not; and what the best treatment for it should be.

overpronation

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Overpronation in runners refers to an excessive inward rolling of the foot after it strikes the ground during running. While some degree of pronation is natural and helps absorb shock, overpronation places extra stress on the foot and leg. When the foot rolls too far inward, it disrupts proper alignment and alters how forces are distributed across the lower body. This can affect not only the feet but also the ankles, knees, hips, and even the lower back, making it a common biomechanical issue among runners.

One of the main causes of overpronation is structural or biomechanical imbalances. Flat feet, low arches, and ligament laxity often predispose runners to roll their feet inward. Other contributing factors include weak stabilizing muscles in the hips and legs, improper running technique, or wearing shoes without sufficient support. Over time, these factors can combine to exaggerate the inward collapse of the foot, leading to poor shock absorption and inefficient running mechanics.

The symptoms and risks of overpronation are varied. Runners often experience pain in the arch or heel, shin splints, plantar fasciitis, Achilles tendonitis, and knee discomfort due to the misalignment of the leg. Overpronation may also contribute to overuse injuries, since the body compensates for poor foot mechanics with increased stress on surrounding joints and muscles. Recognizing these symptoms early can help runners avoid more serious chronic injuries that could interrupt training.

Management and prevention strategies typically involve strengthening exercises, supportive footwear, and sometimes orthotics. Strengthening the intrinsic foot muscles, calves, and hip stabilizers can improve foot control and alignment. Choosing stability or motion-control running shoes with proper arch support can reduce excessive pronation. For runners with more severe cases, custom orthotics may be prescribed to correct biomechanics. Additionally, focusing on proper running form and gradually increasing training load can reduce the likelihood of injury from overpronation. This balanced approach allows runners to maintain performance while protecting long-term joint health.

Most Useful Resources:
Overpronation (Foot Health Forum)
Overpronation in Runners (Podiatry Update)
Overpronation (Podiatry Online TV)
How do you treat overpronation? (Podiatry Experts)
My Advice if you Overpronate (Running Injury Advice)
Overpronation (Dr the Foot Without the Dr)
‘Overpronation’ (Podiatry CPD)
Pronation Mythology (Its a foot, Captain)
The nonsensical understanding of ‘overpronation’ (Run Research Junkie)
Is Overpronation a Problem? (Clinical Boot Camp)
“Biomechanics Corner”: Overpronation (Podiatry Arena)
Overpronation (Foot Info)
Overpronation (Podiatry Daily)

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Barefoot Science

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Barefoot Science is a foot strengthening insole system that has been widely criticized for the lack of science that supports them; the unsubstantiated claims they make; and the claims they make that are contradicted by the evidence.

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Most Useful Resources:
Barefoot Science (PodiaPaedia)
Barefoot Science (Podiatry Arena)
Barefoot Science Foot Strengthening System (Podiatry Arena)
What about Barefoot science insoles? (Podiatry Experts)
‘Barefoot Science’ Insoles (Running Research Junkie)
Barefoot Science (Foot Health Forum)

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Dr Merton Root, DPM

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Dr Merton Root, DPM (1922–2002) is widely considered the ‘father’ of clinical biomechanics in podiatry and the theory (‘Root theory’) that largely underpins the use of foot orthotic is mostly based on his original concepts.

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Dr. Merton L. Root, DPM, was a pioneering podiatrist whose work had a profound and lasting impact on the field of biomechanics and podiatric medicine. Widely regarded as the “father of modern podiatric biomechanics,” he dedicated his career to understanding the structure and function of the human foot. His clinical insights and research shaped how practitioners evaluate, diagnose, and treat foot disorders, moving the profession toward a more scientific and biomechanically grounded approach.

One of Dr. Root’s most significant contributions was the development of the Root Theory of Foot Function, which emphasized the importance of foot alignment and its role in overall biomechanics. He introduced systematic methods for analyzing gait and foot posture, and he advanced the concept of orthotic therapy as a corrective tool rather than just a means of symptom relief. His theories provided a framework that continues to influence orthotic design, foot surgery, and rehabilitation programs today.

Beyond his clinical work, Dr. Root was also a teacher, author, and innovator. His seminal textbook, Normal and Abnormal Function of the Foot (co-authored with Orien and Weed), remains a cornerstone reference in podiatric education. Through teaching, writing, and mentorship, he inspired generations of podiatrists to adopt a rigorous, evidence-based approach. Although aspects of his theories have been debated and refined over time, his legacy endures in the foundational role he played in establishing podiatry as a respected medical specialty grounded in biomechanics.

Most Useful Resources:
Merton L. Root (PodiaPaedia)
Root Theory (PodiaPaedia)
Root Functional Orthotic (PodiaPaedia)
The wit and wisdom of … Merton Root (Podiatry Arena)

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The Mueller TPD Foot Orthotic

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The Mueller TPD Foot Orthotic is a particular foot orthotic design originally developed by Terrance J Mueller DPM to specifically treaty posterior tibial tendon dysfunction. This foot orthotic typically has a deep heel cup and medial and lateral flanges to limit transverse plane motion.

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Most Useful Resources:
Mueller TPD Foot Orthoses (PodiaPaedia)
Mueller TPD Orthotic info (Podiatry Arena)

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Muscle Strength and Arch Height

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There is apparently a lot of controversy on the roles of muscles and muscle strength on the height of the arch in the foot. Almost all of the research shows that there is no relationship between muscle strength and arch height; no relationship between overpronation and muscle strength; and the evidence also shows that foot orthotics do not weaken the muscles neither. There is really no controversy, the evidence is clear.

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Most Useful Resources:
Foot Arches and Muscle Strength (PodiaPaedia)
Overpronation and Muscle Strength (PodiaPaedia)
Foot Orthotics and Muscle Strength (PodiaPaedia)
Increase in muscle strength with foot orthotic use (Podiatry Arena)
Do foot orthoses weaken “arch” muscles? (Podiatry Arena)
Do Foot Orthoses Weaken Feet/Legs? (Podiatry Arena)

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