Tag: biomechanics

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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Magnetic Insoles

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Magnetic Insoles are pseudoscience nonsense. They are insole with magnets that have made up claims about the health benefits of walking around on magnets.

Magnetic insoles are shoe inserts embedded with small magnets, typically made from materials like neodymium or ferrite. They’re marketed with the idea that the magnets can interact with the body’s natural magnetic fields or stimulate specific pressure points in the feet. Most designs place these magnets at strategic locations, like the arch, heel, or ball of the foot, aligning with reflexology zones or acupuncture principles. While the science behind “bio-magnetism” remains controversial, these insoles continue to be popular in alternative wellness circles.

Supporters of magnetic insoles claim they offer a range of benefits, such as pain relief, improved circulation, and increased energy. The magnets are said to produce low-level magnetic fields that may help reduce inflammation or stimulate nerve endings. This is particularly appealing to people with conditions like plantar fasciitis, arthritis, or chronic foot pain. Some even suggest that consistent use can ease discomfort in areas beyond the feet—like the lower back or knees—by altering posture or gait mechanics.

From a scientific standpoint, however, the evidence is mixed at best. Several controlled studies have shown little to no difference between magnetic insoles and placebo (non-magnetic) versions in terms of pain reduction or functionality. Critics argue that any perceived benefits are likely due to the placebo effect or the general comfort of the insole rather than the magnets themselves. Still, because the risks are minimal, many users continue using them based on personal experience, even in the absence of strong scientific validation.

If you’re considering magnetic insoles, it’s worth taking a few factors into account. First, they shouldn’t replace medical treatments for serious foot issues. Also, not all magnetic insoles are made equal—some are cheaply constructed and uncomfortable. Look for well-reviewed products that fit your foot shape properly and provide adequate cushioning. If they help with your discomfort, great—but it’s best to approach them as a complementary tool, not a cure-all.

< Most Useful Resources:
Magnetic insoles ineffective for nonspecific foot pain in the workplace (Podiatry Arena)
Magnetic Insoles (PodiaPaedia)
Magnetic Insoles = Snake Oil (Foot Health Friday)
Magnetic Insoles (Foot Health Forum)
Do magnetic insoles work? (Dr The Foot Without the Doctor)
M is for Magnetic Insoles (Podiatry ABC)

Golf

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The feet are crucial in golf. They are used to walk around on all day and a the platform or foundation that the golf swing starts from.

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Golf is a sport that’s all about precision, patience, and strategy. Unlike many fast-paced games, golf unfolds slowly and thoughtfully, giving players time to plan each shot. It’s typically played on expansive courses with 18 holes, each offering unique challenges like sand traps, water hazards, and varying terrain. The core goal? Get the ball into the hole in as few strokes as possible. What makes it interesting is that the course itself becomes an opponent—changing weather, tricky greens, and unpredictable bounces can all shift the tide of a game.

One of golf’s most iconic features is its equipment. Clubs are categorized mainly into drivers, irons, wedges, and putters, each designed for specific shot types and distances. Golf balls also matter—a lot. The number of dimples, the compression, and the material can all influence flight and spin. Add to that the importance of golf attire (hello, collared shirts and spikeless shoes), and it’s clear the sport balances tradition with a touch of flair. Unlike team sports, golf is mostly a solo mental game, which makes consistency and self-control major assets.

From a cultural standpoint, golf has deep roots, especially in places like Scotland, where the modern game was born. Over time, it’s grown into a global phenomenon, with major tournaments like The Masters, the U.S. Open, and The Open Championship drawing huge crowds and media attention. Big-name players like Tiger Woods, Rory McIlroy, and Scottie Scheffler have brought fresh energy and broader appeal to the sport. It’s also a favorite among business professionals—not just for the game itself but for the networking and conversations that often happen during a round.

Finally, golf isn’t just for the pros. It’s widely accessible through public courses, driving ranges, and even mini-golf setups. People of all ages and skill levels can enjoy it, and it offers both physical and mental benefits—walking the course provides light exercise, while planning shots and reading greens sharpens focus. Plus, there’s something therapeutic about spending a few hours in open, green spaces. Whether you’re chasing a birdie or just trying not to triple-bogey, golf invites you to slow down and enjoy the challenge.

Most Useful Resources:
Golf Threads (Podiatry Arena)
Golf and foot orthotics (PodiaPaedia)
Golf (Podiatry TV)
Golfshot (Podiatry Apps)
Foot Orthotics for Golf (Podiatry Update)

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Jacks Test

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Jacks Test is a test of how hard it is to dorsiflex the hallux when weightbearing, so is a test of the integrity of the windlass mechanism. It is known at the Hubscher maneuver in the USA

Jack’s test is a clinical examination used to assess the function of the medial longitudinal arch of the foot, particularly in evaluating for flexible flatfoot (pes planus). It is also known as the “Hubscher maneuver.” The test is typically performed while the patient is standing. The examiner dorsiflexes the big toe (hallux) while observing changes in the arch of the foot. A positive result is indicated by the formation of an arch when the big toe is dorsiflexed, suggesting that the flatfoot is flexible and not rigid.

This test is based on the windlass mechanism of the foot. Dorsiflexion of the big toe tightens the plantar fascia, pulling the heel and the ball of the foot closer together and raising the arch. In a patient with a functional (flexible) flatfoot, this mechanism remains intact, and the arch reappears when the toe is lifted. However, in cases of rigid flatfoot, the arch remains flat despite dorsiflexion of the toe, indicating a more serious structural problem that may require orthopedic intervention.

Jack’s test is a simple yet valuable tool for distinguishing between flexible and rigid flatfoot, helping clinicians guide treatment strategies. Flexible flatfoot is often managed conservatively with physical therapy, orthotics, or footwear modification, while rigid flatfoot may necessitate more invasive interventions. Jack’s test can also be useful in pediatric assessments, as flatfoot is common in children and often resolves with age. By providing insight into foot mechanics, the test aids in early detection and proper management of arch-related foot disorders.

Most Useful Resources:
Jacks Test (Podiapaedia)
Jacks Test and failure of STJ supination with ext tibia rotation (Podiatry Arena)
Is Jacks test valid? (Podiatry Arena)
The Hubscher maneuver or Jacks test? (Podiatry Ninja)
Jacks Test (Bunion Surgery)

Foot Posture Index

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Foot Posture Index is a composite measure of the posture of the foot based on 6 different observations of the alignment or posture of different segments of the foot.

The Foot Posture Index (FPI) is a widely used clinical tool for quantifying standing foot posture, helping to classify feet as pronated, neutral, or supinated. The most common version is the FPI-6, which involves observing and scoring six specific criteria. This assessment is quick, simple, and reliable, making it valuable for clinicians and researchers alike.

Here’s how to calculate the FPI-6:

1. Preparation and Patient Positioning
The patient should stand barefoot in a relaxed, neutral stance with both feet supporting their weight. Their arms should be naturally at their sides, and they should look straight ahead. It can be helpful to have them march in place for a few steps before settling into their stance. The assessment usually takes about two minutes, and the assessor needs to be able to move around the patient freely.

2. The Six Criteria and Scoring
Each of the six criteria is scored on a 5-point scale, ranging from -2 to +2. A score of 0 indicates a neutral position for that specific criterion. Positive values (+1, +2) are given for pronated features, with higher scores indicating more pronation. Negative values (-1, -2) are given for supinated features, with more negative scores indicating more supination. If an observation cannot be made (e.g., due to swelling), it should be skipped and noted.

The six criteria are:

  • Talar Head Palpation (Transverse Plane): This involves palpating the talar head. The score depends on whether the talar head is more palpable on the lateral (outer) or medial (inner) side of the foot.
  • Curves Above and Below the Lateral Malleolus (Frontal/Transverse Plane): Observe the curvature around the ankle bone (lateral malleolus) from behind. The score is based on whether the curve below the malleolus is straight, convex, or more or less concave compared to the curve above it.
  • Calcaneal Frontal Plane Position (Frontal Plane): Observe the heel bone (calcaneus) from behind. The score reflects whether the heel is inverted (varus), everted (valgus), or vertical, often estimated in degrees.
  • Prominence in the Region of the Talonavicular Joint (Transverse Plane): View the inside of the foot at an angle. The score depends on whether this area is concave, flat, or bulging.
  • Congruence of the Medial Longitudinal Arch (Sagittal Plane): Observe the inner arch of the foot from the inside. The score ranges from a high, acutely angled arch to a very low, flattened arch that might be making ground contact.
  • Abduction/Adduction of the Forefoot on the Rearfoot (Transverse Plane): View the foot from behind. The score is based on how many medial (inner) or lateral (outer) toes are visible, indicating whether the forefoot is abducted (splayed out) or adducted (turned in) relative to the rearfoot.

3. Total Score and Classification
After scoring each of the six items, sum the individual scores to get a total FPI-6 score. The total score can range from -12 (severely supinated) to +12 (severely pronated). The foot posture is then classified based on this total score:

  • Severely Supinated: ≤ -5
  • Mildly Supinated: -1 to -4
  • Neutral Posture: 0 to +5
  • Mildly Pronated: +6 to +9
  • Severely Pronated: ≥ +10

It’s important to note that a slightly pronated foot posture (mean raw score of +4) is considered the normal position at rest in a healthy adult population. The FPI is a practical tool that aids in deciding appropriate interventions, such as strengthening exercises, stretching, manual therapy, gait training, or selecting suitable orthotics.

Most Useful Resources:
Foot Posture Index (Podiatry TV)
The Foot Posture Index (Podiatry Update)
Foot Posture Index (Clinical Boot Camp)
Foot Posture Index (PodiaPaedia)
Foot Posture Index (Podiatry Arena)

The Determinants of Gait

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The Determinants of Gait are the biomechanical strategies that the body uses in order to maintain the center of gravity in the horizontal plane, as well as increase efficiency and to decrease the expenditure of energy when walking and running

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The Determinants of Gait are a set of six distinct movements that occur during the gait cycle to minimize the vertical and horizontal displacement of the body’s center of gravity. The primary purpose of these movements is to make walking more energy-efficient and smooth. Without these determinants, a person’s walk would be an inefficient “compass gait,” characterized by a significant up-and-down motion. The selected text from the Canvas document describes the general gait cycle, but doesn’t go into these specific, energy-saving movements.

 

The six classic determinants of gait are:

  • Pelvic Rotation: The pelvis rotates forward on the side of the swinging leg. This action lengthens the stride and reduces the peak of the body’s center of gravity, smoothing out the vertical path.
  • Pelvic Tilt (or Pelvic Obliquity): During the swing phase, the pelvis on the non-weight-bearing side drops slightly. This also helps to lower the body’s center of gravity, preventing an excessive rise as the body moves over the stance leg.
  • Knee Flexion in Stance Phase: As the foot makes contact with the ground, the knee flexes slightly. This acts as a shock absorber and prevents the body’s center of gravity from rising too high during the middle of the stance phase.
  • Foot and Ankle Mechanisms: This refers to the coordinated movements of the ankle and foot. The plantarflexion of the foot at heel strike and the subsequent dorsiflexion work to smooth the path of the body’s center of gravity.
  • Knee and Ankle Interaction: The way the knee and ankle move together also contributes to maintaining a smooth center of gravity. The knee begins to flex after heel strike and extends later in the stance phase, while the ankle’s rotation also changes the effective length of the leg, keeping the body’s center of gravity from oscillating too much.
  • Lateral Pelvic Displacement: The body shifts from side to side over the stance leg to keep the center of gravity over the base of support. This reduces the lateral, or side-to-side, displacement of the center of gravity.

Together, these six determinants work to create the smooth, undulating path of the body’s center of gravity, which is essential for an efficient and effortless walk.

Most Useful Resources:
Determinants of gait (Foot Health Forum)
Determinants of gait discredited? (Podiatry Arena)
The Determinants of gait (Podiatry Arena)
Determinants of Gait (PodiaPaedia)
Determinants of Gait (Podiatry TV)
The Six Determinants of Gait (Podiatry Ninja)

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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)

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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Accessory Navicular

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The accessory navicular is an extra bone on the medial side of the navicular that can cause pain due to pressure on the lump from footwear (especially things like ice skates) and also be a factor in flat or overpronated feet due to changes in the pull of the tendon from the muscle that is the main supporter of the arch of the foot.

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The accessory navicular (AN) is a common anatomical variation of the foot that can cause discomfort and pain in some individuals. It is an extra bone or piece of cartilage located on the inner side of the foot, near the arch.
What is an Accessory Navicular?
The accessory navicular is a congenital condition, meaning it is present at birth. It is estimated that around 10-15% of the general population has an AN, although not all individuals with this condition will experience symptoms. The AN can be classified into three types:
  • Type 1: A small, rounded ossicle (bone) within the posterior tibial tendon.
  • Type 2: A larger, triangular-shaped bone connected to the navicular bone by a synchondrosis (cartilaginous joint).
  • Type 3: A bony prominence that is fused to the navicular bone.
Symptoms of Accessory Navicular
While many individuals with an accessory navicular do not experience symptoms, others may develop pain and discomfort due to various factors, such as:
  • Overuse or repetitive strain: Activities that involve repetitive stress on the foot, such as running or dancing, can cause irritation and inflammation.
  • Poor foot mechanics: Abnormal foot pronation or supination can put additional stress on the AN, leading to pain and discomfort.
  • Trauma: A direct blow to the foot or a sudden injury can cause pain and inflammation in the AN.
Common symptoms of accessory navicular include:
  • Pain or tenderness: On the inner side of the foot, near the arch.
  • Swelling or redness: Around the AN.
  • Limited mobility: Stiffness or limited range of motion in the foot or ankle.
  • Difficulty walking: Pain or discomfort while walking or engaging in activities.
Diagnosis and Treatment
Diagnosis of accessory navicular typically involves a combination of:
  • Physical examination: A healthcare professional will assess the foot and ankle for pain, tenderness, and range of motion.
  • Imaging studies: X-rays, CT scans, or MRI scans may be used to confirm the presence of an AN.
Treatment for accessory navicular depends on the severity of symptoms and may include:
  • Conservative management: Rest, ice, compression, and elevation (RICE) can help alleviate pain and inflammation.
  • Orthotics and shoe modifications: Custom orthotics or shoe inserts can help redistribute pressure and reduce stress on the AN.
  • Physical therapy: Stretching and strengthening exercises can help improve foot mechanics and reduce pain.
  • Surgery: In some cases, surgical removal of the AN or repair of the posterior tibial tendon may be necessary.
Prevention and Management
While it is not possible to prevent an accessory navicular, there are steps that can be taken to reduce the risk of symptoms:
  • Wear supportive shoes: Choose shoes with good arch support and cushioning.
  • Use orthotics: Custom orthotics can help redistribute pressure and reduce stress on the AN.
  • Stretch and strengthen: Regular stretching and strengthening exercises can help improve foot mechanics and reduce pain.

Most Useful Resources:
Accessory Navicular (PodiaPaedia)
Surgery for accessory navicular (Podiatry Arena)
Accessory navicular (Podiatry Arena)
Classification of the Accessory Navicular (Podiatry Ninja)
Accessory Navicular (Foot Health Forum)

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Foot Strike Pattern and Injury Rates in Runners

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There is a lot of debate online about which is the best running technique for a runner to use. One of the more common debates is about the foot strike pattern and if it should be forefoot, midfoot or heel striking the ground first. The bulk of the evidence does not support one over the other.

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The foot strike pattern refers to the way a runner’s foot makes initial contact with the ground during each stride. There are three primary types: rearfoot strike (heel strike), midfoot strike, and forefoot strike. In rearfoot striking, the heel touches the ground first, followed by the midfoot and forefoot. Midfoot striking involves the heel and ball of the foot landing almost simultaneously, while forefoot striking means the ball of the foot contacts first, with the heel either lightly touching afterward or not at all. These patterns can influence biomechanics, efficiency, and risk of injury.

Most recreational runners naturally adopt a rearfoot strike, especially at slower paces. This pattern provides more stability and often feels comfortable because cushioned running shoes are designed to accommodate it. However, heel striking also increases impact forces transmitted up the leg, which has been associated with certain injuries like shin splints or knee pain. On the other hand, elite distance runners tend to show more variety, with some preferring midfoot or forefoot strikes, particularly at faster speeds.

A midfoot strike is often considered a balance between cushioning and efficiency. It tends to reduce the braking forces that occur with a heavy heel strike while avoiding the high calf and Achilles loading associated with forefoot striking. Many coaches recommend midfoot striking for long-distance running because it spreads out impact forces more evenly across the foot. However, adopting this pattern requires adequate ankle and calf strength, and a gradual transition to avoid overuse injuries.

The forefoot strike is commonly seen in sprinters and barefoot runners. This style allows for faster turnover and efficient energy return from the Achilles tendon, which acts like a spring. It’s beneficial for short, explosive efforts but places significant stress on the calves, Achilles tendon, and metatarsals. Without careful adaptation, runners switching suddenly to a forefoot strike can experience calf strain or plantar fascia issues. Ultimately, no single pattern is “best” for all runners—individual biomechanics, goals, and comfort largely determine the most suitable strike pattern.

Most Useful Resources:
Foot Strike Pattern and Running Injury (PodiaPaedia)
Foot Strike Pattern and Injury Rates (Running Research Junkie)
Its six of one and half a dozen of the other: Rearfoot vs Forefoot striking when running (Running Research Junkie)
Emerging Evidence on Footstrike Patterns in Running (Podiatry Arena)
Running Footstrike: Rearfoot, Midfoot or Forefoot, Which is Best? (Podiatry Arena)
New studies on injury rates between forefoot and rearfoot striking (Podiatry Arena)

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