New changes around Mizuno's 2011 running footwear lineup

What the GAit Guys Say:     It is Time for Shoe Talk on The Gait Guys: breaking news…New Mizuno Wave Rider Shoe…..still the same Heel to Forefoot Ratio (RF:FF ratio)……still 2:1 (24mm : 12mm). The Precision is also 2:1 (22mm:10mm). Concern ? The heel is still raised, altered forefoot load, promotes heel strike, short posterior compartment ?

It is well documented in the literature that cushioned shoes increase impact forces. Increased impact forces often lead to injury and compensation… and the Wave rider 12 won an editors choice award from Runners World? What are they thinking? Increased comfort does not necessarily equate to better performance. How many athletes do you know who train in a recliner?


Orthotic Shoe Inserts May Work, but It's Not Clear Why

Leading orthotics researcher, professor of biomechanics@ Human Performance Lab @ Univ. of Calgary,Alberta. His conclusion: orthotics may be helpful as a short-term solution, preventing injuries in athletes. But it’s not clear how to make inserts that work. The idea that they are supposed to correct mechanical-alignment problems does not hold up. The work of THE GAIT GUYS, hopes to offer some insight.
Ivo Waerlop A potential riff in the article (Via Stu Currie):

1) Primates only have a transverse arch – they are flat in the longitudinal direction.

2) In primates the metatarsal bases are on the same plane as the metatarsal heads.

3) The length of the phalanges is 18% of total foot length in humans, and 35% in chimps.

4) Australopithecus afarensis (Lucy) has the beginning features of a longitudinal arch, while retaining many characteristics of the ape foot. The same can be said for other hominid ancestors (H. Habilus)
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January 20 at 7:51am · LikeUnlike

Ivo Waerlop We have always said that orthotics serve as a therapy, not a solution. Your prescription should be getting better (lessening) or more correction taken out with time, not becoming greater. They are an excellent tool, but not a substitue for good mechanics.

Shod landing provides enhanced energy dissipation at the knee joint relative to barefoot landing from different heights.

Its great to wear shoes if you are jumping, but not necessarily running. It is interesting that ground reactive forces were not significantly different for shod vs unshod conditions and that that knee flexion, angular velocity and power were higher for those “perceiving” that there would be more cushioning. It goes to show we are not smarter than our brain (we just think we are !).


 http://www.ncbi.nlm.nih.gov/pubmed?term=%22Yeow%20CH%22%5BAuthor%5D

Knee. 2010 Aug 24. [Epub ahead of print]

Shod landing provides enhanced energy dissipation at the knee joint relative to barefoot landing from different heights.

Yeow CHLee PVGoh JC.

Department of Orthopaedic Surgery, National University of Singapore, Singapore; Division of Bioengineering, National University of Singapore, Singapore.

Barefoot Shoe Companies please take note. Barefoot-Natural Running: Fad or Trend

One question still remains, is this whole barefoot “thing” a fad or is it truly a trend that is here to stay ? The Gait Guys believe it has become entrenched enough now, in reputable research journals, that this is a firm trend that will not be going anywhere anytime soon.  The studies are just too convincing that there are benefits. However, Dr. Waerlop and I feel that there are risks for some folks.  Those mainly being that some foot types do not, and never will, have business being in such minimalistic shoes. We remained concerned about the misleading advertising, that these types of shoes will make everyone’s feet stronger. For some, they will, but most of the time strength education must be directed, so why would it be any different here ?  For example, there is a right way to do a squat, and a wrong way and merely doing more of them without guidance does not guarantee that the intended and proper motor patterns will be achieved. We all need direction when it comes to difficult things, like proper foot function.  Thus, merely putting on a minimalistic shoe does not mean that the correct patterns and strategies for foot strengthening are being automatically instituted. We see plenty of folks who are in minimalist shoes and yet still display toe hammering and clenching behaviors which are clearly not seen in strong feet, to the claims that these shoes will do it all are just not true.  And, for those that have challenged foot types and lower limb torsional issues (ie. FF varus, Rothbart Foot, cavovarus foot, excessive tibial varum and/or tibial torsion etc) these folks will likely trend towards local foot problems or injuries or issues further up the kinetic chain (hip, knee, low back etc).  Understandably, these are heavy medical terms and conditions that are very much out there in the running public. We know, we see them daily.  The problem could be that those providing the education do not have enough clinical background to know what these issues are let alone recognize them.  So how can they then draw these issues to the surface in educating the public ?  As I say in my lectures, “You first have to know what a platypus is in order to identify it.  Otherwise it is just a hedge hog with flippers and a duck bill."  These underlying anatomic issues are the elephants in the room that everyone is missing, everyone except us.  We get the folks who are running in these minimalist devices and we get to see who never should have been in them in the first place.

The good thing is that many companies are setting up educational programs to help folks drop down into "minimalism 2.0” but still, to date, no one is talking about the elephants in the room, those being those foot types that are too risky to be in the shoes and even more specifically, how to strengthen the foot.  Merely putting the shoes on and wearing them does not mean the end user who already has challenged feet will begin to engage the correct muscular motor patterns.  But who would admit to those risks, that would be stupid advertising and product risk.  With 36+ clinical years we feel this is where we have some pull and can help.

Someone needed to be talking about the elephants in the room.  We finally decided that we had enough experience clinically, and with runners and shoes, to be that person. Agreeably, there is a danger in doing too much barefoot running too soon. We made this clear over the past few years as Biomechanics Advisory Board members for one of the big players in this game.  For us it is about “keeping them honest” as we like to say now. We are trying to make the calls on the products that have questionable statements and applaud those that stick their neck out but whom take our critique well.  We do not know everything, but we seem to know much more than most when it comes to the biomechanics of what is going in these products.  If you put 10 different feet in a product, you will get 10 different biomechanical presentations from the shoe. So, much of what is being missed is the education of what is going on with the parts that are in the shoe, and that is our world.  A major part of the barefoot or natural running trend are the problems that exist with the thing you are putting into all of these products, a person. A person who likely does not have the classic middle of the road, ‘Average Foot’ these shoes were designed around; that foot that all these companies base their research and dialogue upon.  To us, the most important thing for us to do is to raise the knowledge and awareness to the public, shoe companies and shoe stores that there is likely a ~10-15% standard deviation off of that average foot where their products will work as they claim.  Those other 70%, well…….they need us and they deserve to have us help them see the elephants in the room that no one is talking about.

If the collective goal of the natural running movement is to reduce injuries then the education MUST continue into educating the fabricators and running public of all of the issues at hand (or “foot” in this case) which should include talking about the elephants in the room.

Please help us get the message out. Wouldn’t it be great if this message went viral ? Send this to your friend who just bought a pair of “barefoot or minimalistic shoes”. Send it to your shoe store owner, your coach, your trainer, your doctor, therapist, your running club colleagues, your brother etc.

Lets educate everyone so this positive trend does not have a dark undercurrent that no one speaks of.


Shawn Allen, Ivo Waerlop………with almost 4 decades of clinical experience…..we are,  The Gait Guys

The effect of footwear and sports-surface on dynamic neurological screening (click for link)

Shoes make the man, or in this case, the athlete. This study shows that shoes (much like skis) allow us to perform faster than our brain is able to compensate ( in other words, we lack the skill) and allow us to sometimes stretch our  abilities, often at the cost of an injury. We must remember that technology must keep pace with the rate of neural learning, not the opposite.

J Sci Med Sport. 2010 Jul;13(4):382-6. Epub 2010 Mar 15.

The Ecco Biom

The Human Foot: It makes up to 175 calculations per second …….Yes, the foot is just about one of the most amazing pieces of engineering out there.  And when it works well, it is amazing. And when it goes sour……man it goes sour !

Watch this video for the new Ecco Biom.  This guy Torbjorn Sindballe is an amazing athlete. Through the sagittal plane his biomechanics look pristine. However, through the frontal plane, well that is another matter. We will discuss that in a moment.

Of first order, lets look at the video segment at 13 seconds.  In what at first looks like a cool video clip, at 13 seconds we see a foot flash before our eyes showing a heel strike barefooted (it appears to be running to us).  If it is in fact running, that is just not realistic. It is fine for walking gait but not for running, the impact is too great, the necessary control is excessive, and the deceleration forces just too much. 

* and to prove another point as to why heel strike while running is incorrect, think about this and then we will prove it at exactly 18 seconds into the video. The heel (calcaneus) is rounded. And it sits on top of a soft fat pad. If your sagittal mechanics are not perfect, the heel can wobble or rock suddenly and quickly from side to side. This is why you see running shoes with a deep seated heel counter and dual density foam in the arch to provide control and to help direct this foot forward onto the more stable bipod forefoot.  A single point is unstable, and thus heel strike at a running velocity is asking for trouble. Now, go and watch the video again at 18-19 seconds…..see that sudden jarring of the heel ! If you are going into an accentuated inversion or eversion event,  that impact event could carry you there in a hurry and that might not be good and/or it will necessitate a sudden ligamentous or muscular correction from the frontal stabilizers (which could lead to repetitive strain).  So when you run, in our opinion (and that of many of the experts and current research) perfect form is one of forefoot /mid-forefoot strike, then kiss the heel down to the ground if you wish and then lever off with glute and calf power. That is proper mechanics and shoes with thick generous heels can impede this normal event as Lieberman’s Harvard studies have shown.

Now, back to Torbjorn. Well, his sagittal mechanics are admittedly gorgeous !  But his frontal plane foot pronation mechanics leave a little something to be desired (don’t get us wrong, “if it ain’t broken, maybe you don’t fix it” when it comes to a super athlete like Torbjorn, and additionally as we know very well, what appears to be wrong is not always the case when you examine a person) but we do not like what we see. Particularly, at 36 seconds into the video you see rather aggressive left foot rear and mid foot pronation.  That might not be good over 26 miles and 100+ training weeks. The right foot needs a little work too if you ask us.  He should not be in that shoe if you ask us. But hey, who the heck are we anyways right ?……..

Shawn and Ivo……we are…….The Gait Guys……..(that’s who !)

(* Torbjorn, if you are reading……we could help you with that left foot if it becomes a problem. Lets hope not ! Keep up the really great performances, setting the standard !  Keep them looking at the backs of your shoes……and……just so you know…..we like some of the features of the shoe, we will be getting a pair and do a review unless you want to comp us a pair and begin some dialogue.)

Footballer’s Ankle (follow up on the iWalk Powerfoot):
This is clinical condition which is most  often present in those who have engaged in kicking sports for a number  of years. As in soccer, the striking of the ball forcefully in a plantarfl…

Footballer’s Ankle (follow up on the iWalk Powerfoot):


This is clinical condition which is most often present in those who have engaged in kicking sports for a number of years. As in soccer, the striking of the ball forcefully in a plantarflexed position can generate a traction apophysis (bony tubercle) from the repeated traction stress put on the anterior ankle capsule and ligaments.  This tubercle can form a spur that can act like a door stop impeding any further ankle dorsiflexion (rocker). Footballers ankle manifests itself with pain at the front part of the ankle joint. Soft tissue can become trapped at this anterior joint aspect and produce localized pain. IT will look like a normal degenerative spur, but the clients age and activity will help clarify the diagnosis and pathogenesis. 

iWalk Powerfoot video Army

Here in this video our keen eye was correct regarding the reduction in ankle rocker and subsequent heel rise.  The video when the soldier is walking down the stairs (most notable for on the last step) gives an excellent example of what happens when ankle rocker (tibiotalar dorsiflexion) is impaired (this can look like another clinical condition called FootBaller’s ankle if a spur develops). See how much knee lift he has to generate, forced by the early heel rise.  Once again, still an amazing piece of engineering.

(* If the fabricators are reading this, we are here to help !  Start by moving that metal bar at the front of the “mortise” another few millimeters forward and you will get the extra few degrees to reduce that rocker/heel lift issue. This will smooth out mechanics at the hip and knee and add to user stability and balance.)

iWalk PowerFoot Gait Animation

Check out this 3 million dollar bionic foot! For a walking gait cycle (not running cycle) it shows excellent heel rocker; and the appearance of a little hallux limitus (an articulating first metatarsophalangeal joint with an eccentric axis is likely a bit complicated to produce)…….But, for all that money you would have thought they could have added more ankle rocker ! The model gets to what looks like about 110-115 degrees which is the lower limit of what is necessary. It is why you see such an early heel rise in the video.  Why don’t folks just call us…..we would have  taken $100,000 for a consulting fee on this one to help them get it right ! Despite its shortcomings, it is quite a remarkable piece of engineering, truly. 

Fabricating a Shoe Last: The LAST word

A few words about lasts (but not the last)

Dr. Ivo Waerlop & Dr Shawn Allen

A last is the mold or template for creating the shoe. It defines the shape of a shoe. The last can create a high, medium or low volume shoe. They can also be relatively straight or curved (this refers to the shape of the “sole” of the shoe). If you turn the shoe over and stare at the sole, mentally bisect the heel with a line going to the front of the shoe. If the line bisects it, it is a straight lasted shoe (this corresponds to the axis of the 2nd metatarsal, or slightly lateral to it). If more of the shoe falls medial to this (more of the sole on the big toe side) it has a curved last. Curved last shoes can vary in the degree of curvature. Curved last shoes are designed to help control pronation, as they provide medial support and slow its rate by causing a relative supination of the foot after heel strike (it weights the lateral border of the shoe for a longer period of time, theoretically allowing less pronation). Curved last shoes can put more motion into a foot, especially one with limited rearfoot motion (it still must pronate, but due to the lack of rearfoot motion, the forefoot must compensate and now must do so in a shorter period of time).

Last also refers to the material (or way that the material) overlays the midsole of the shoe. The last (look inside the shoe on top of the shank) is the surface that the insole of the shoe lays on, where the sole and upper are attached).    Shoes are board lasted, slip lasted or combination lasted. A board lasted shoe is very stiff and has a piece of cardboard or fiber overlying the shank and sole (sometimes the shank is incorporated into the midsole or last).  It is very effective for motion control (pronation) but can be uncomfortable for somebody who does not have this problem.  A slip lasted shoe is made like a slipper and is sewn up the middle.  It allows great amounts of flexibility, which is better for people with more rigid feet.  A combination lasted shoe has a board lasted heel and slip lasted front portion, giving you the best of both worlds (theoretically).

A general rule of thumb is: You really can’t go wrong with a straight last. It will work for all feet, especially if you are using an orthotic. This is especially important with people with forefoot abductus, moderate to severe pronators and rigid feet (rear or forefoot). A forefoot abductus and severe pronator’s feet will move laterally in the shoe, often causing crushing, rubbing, cramping and blistering of the little toe against the side of the shoe. A rigid foot, because the foot needs to be able to pronate at the mid and forefoot, will have a similar problem. You can use a curved last with people with mobile or hypermobile feet, provided their pronation is not too severe (clinical judgment, trial and error).

I hope this clarifies some of the issues surrounding lasts, their shape, and usage. This will probably not be the last word on lasts, but hopefully will suffice some of the burning curiosities surrounding the subject.

* important addendum to the youtube video: please note that the last that was created has a raised heel (if you look closely). This will put the shoe and foot in relative plantarflexion. This is likely for a traditional trainer running shoe or daily dress shoe where there is a 20+mm heal lift in comparison to the forefoot platform. Beware, this is not how the foot was designed, ie. rearfoot and forefoot are supposed to be on the same plane for anatomically designed biomechanics. This plays into the mechanical features of the minimalistic shoe trend of Newtons, Vibrams, NB minimus, Atra Adam and EVE, TEraPlana etc. 

We hope this was helpful,…….Ivo and Shawn……..we are, The Gait Guys

The Dumpling Walk !

Its time for Gait Guys Gait Gaffs again ! 

This is one of our all time favorite gait styles. Aside from the atonic arm swing, what we love about this one is the vertical nature of this gait style.  If you look around you will see this one often. These are the bouncy folks.  There is a bucket load of vertical body movement when in fact the head should stay static in gait and in running.

This gait style is caused by a premature heel rise from premature engagement of the gastrosoleus (and sometimes even the long toe flexors, you will see them hammering and curled). The person will never get to full late-midstance of gait and thus never achieve full hip extension nor adequate ankle dorsiflexion / ankle rocker. These are timely events and specific things are supposed to happen during these phases of gait that are omitted and thus passed into other areas for compensation. This gait style is very inefficient in that the gluteals cannot power into hip extension into a forward progression drive, because the calf is prematurely generating vertical movement through ankle plantarflexion.  This strategy is sometimes deployed because the person actually is significantly ankle dorsiflexion (ankle rocker) deficient.  Meaning, they hit the limitations of dorisflexion and in order to progress forward they first have to go vertical. Obviously, the remedy is to find the functional deficit, remove it and retrain the pattern.  We will be going over this pattern quite a bit in our new DVD line when we can get to it, because there are other deficits that could drive this one such as short hip flexors and quads to name one. 

See you again on Gait Guys Gait Gaffs !…….Shawn and Ivo, we are…….The Gait Guys

A Pedograph mapping case.  Everyone wants to use the high tech stuff, we say you dont need it most of the time.  What do you see in this case ?
Answers: Increased heel pressure, Uncompensated forefoot varus (as evidenced by a lack of ink under the f…

A Pedograph mapping case.  Everyone wants to use the high tech stuff, we say you dont need it most of the time.  What do you see in this case ?

Answers: Increased heel pressure, Uncompensated forefoot varus (as evidenced by a lack of ink under the first metatarsals (you could even put a Rothbart foot-type on your DDx list), increased clawing of the 2nd-3rd digits on the right, and bilateral Morton’s second toes.  If you look carefully at the big toe ink presentation you can see a “pinch” callus on the left foot at the medial aspect of the hallux. This might also represent some increased pressure being exerted by the short big toe flexor (flexor hallucis brevis), the longus (FHL) would give a more distinct distal pressure and ink response at or near the tip of the toe. What you want to see is a nice ink spot that is well blended throughout the entire pad of the hallux.  There is also similar hint of more use of the short flexor on the right and less of the long flexor. Overall the toes are bunched together in a group, there is not much separation, we sometimes take this as a global representation of a weaker foot.

Q: What could this transfer to as a clinical presentation (what kinds of things might you be suspicious of as you conduct your examination ?:

Answer:

Obviously heel pain has to be on the list.  There is a fair amount of heel pressure going on here.  With a forefoot varus or, simply put, incompetence of the medial foot tripod stability structure the person is more likely to generate more medial rotation of legs.  This, if not met will good pelvic and core resistance, can lead to lumbopelvic functional instability and thus low back pain. Typically, Forefoot varus clients either pronate very heavily, sometimes late (as in this case) as evidenced by lack of heavy ink printing through the arch area, or they tend to compensate and try to walk on the outsides of their feet. Anyone who delays or rushes the 3 rockers of the foot (rear, mid or forefoot rockers) is going to see compensations to the compromised the ankle rocker movement.  This obviously has its complications as well.  There is no good compensation.  As we say, if something is not working right……..someone has to pay, eventually.

Hallux rigidus (turf toe): A Case of Back Pain

Another case today. Right hallux limited dorsiflexion range. Causing early heel rise in late midstance phase of gait because the forefoot rocker was impaired. Thus, the client will see reduced hip extension and inhibit glureal function and either: 1- destabilize the Sacroiliac joint bc compression is lost across the joint And/or 2- force the patient to increase lumbar lordosis, or spin the torso/pelvis outward to equal the step length on the opposite side which occurred through proper hip extension. ( at the cost of tipping the right hemipelvis anterior thus affecting the lower right abdominals. ) Something has to give to make up for the loss at the big toe ! Certainly there are many other strategies to play out other than this one.

The Gait Guys: Some strategies in Controlling the Foot Arches and Big Toe

As promised. We fixed the volume.  Less hiss next time. Enjoy

Dr. Shawn Allen of The Gait Guys speaks about proper stabilization of the medial foot and arch. Muscle specifically discussed are a team: FHB (flexor hallucis brevis), AbDuctor hallucis, and tibialis posterior. He discusses the functional anatomy, normal and pathologic movement patterns of the arch and first ray complex and big toe (hallux). His foot’s ability to show the optimal patterns for the arch and hallux are excellent examples. Follow up videos and DVDs will show more details you need to know, and some of the exercises he and Dr. Ivo Waerlop use to restore a foot that has lost these abilities. The DVDs are in the works. Take their lectures and CME on www.onlineCE.com. Visit them at www.thegaitguys.com and on their facebook PAGE & Twitter of the same name for daily feeds of unique things.

Barefoot Winter Footwear: The mukluk.

In this, the latest of The Gait Guys videos, Dr. Shawn Allen talks about a neat product, the Steger Mukluk. It is about as close as you can get to a Minimalist Winter boot (in case you are chasing caribou in the north, or shoveling out from the Chicago Blizzard of 2011, or just working outside in the bitter cold). Some interesting principles of minimalist shoes apply here. Where do these guys come up with their ideas !

5 crucial running mistakes ? Really ? Hogwash ! (click on title for the article link)

More garbage on the internet about running myths. We need a Gait Police. Wait ? Maybe that should be us !

This MSNBC article is exactly why we are trying to spread the word.  This article has so many half truths and misleadings that it isn’t even worth reading in our opinion. MAybe next time they will ask us for this kinda stuff.

One of the first things you must know the next time you decide to watch your running in a mirror, or get a professional gait analysis done, is that what you see is not the problem…….so carry this main thought with you.

* What you, or your gait analysis professional or your running partner behind you, see in that mirror or on that video is often not the problem.  How you are moving is your neuro-musculoskeletal system’s best interpretation to demonstrate a functional gait with the parts that ARE working correctly. In other words, what you are seeing is a best case scenario for the central nervous system to achieve stability most of the time.

So, when your coach or therapist or gait “Specialist” tells you that you need to increase your arm swing on the right, or turn your left foot in……to make a correction towards what looks symmetrical to them and to you, please stop them and say “but that is not the problem, that is my strategy to run as best as i can. I am not doing those things because i have nothing better to do when i run!” And, even worse, tell them not to give you exercises to correct those visual flaws ! And educated person in the field of neuromusculoskeletal medicine has to make those recommendations based on the faulty sensory and motor patterns they assess, and the muscular weaknesses that are discovered.  Neuroadaptive changes are for a good reason, even though they may look bad. For example, a right foot might be turning out into the frontal plane for the good reason that your hip stability in the frontal plane is insufficient, and thus the best strategy determined by your central nervous system was to turn out the foot to better engage and protect that plane. It might not however, be logical to us to make the change so far away from the area of problem, but for those of us who do this daily over and over again, it makes pretty decent sense. 

The patterns you display are neuromechanical strategies, strategies and compensations to best stabilize the body parts during the activity. It is obvious to the viewer that the pattern is wrong, but the brain has made these changes for a good reason. Don’t think you are smarter than your brain !  (how’s that for a final statement !)

We are, The Gait Guys

Asics Gel Speedstar 5

We were asked today to give our quick prelim opinion on this shoe. Aside from all the nice creature comforts of the new design it does not look too terribly different from previous models. I have the last model. I liked it. But, it was pretty curve lasted so, if this model is no different, and if you are a person with pronation control issues or if you still are not out of heel strike running you might not like this one. But it will allow you to mid-forefoot strike easier than the bulkier model trainers out there. It is light, sub 10oz. But our major concern is that it appears (we havent gotten a pair yet to cut them up, hopefully someone else will get to it and save us more work) that it still has a higher slope from a raised heel (>1:1) RF:FF (rear:forefoot ratio). From looking at my last pair and this one, i would be it still has about a 10mm heel rise over the forefoot height (maybe a few less if we are all lucky !, but we doubt it). Certainly better than more traditional trainers in this respect. This heel rise will inevitably still suggest or encourage heel strike. We have been pounding the floor for years to reduce this ratio…..we are so glad folks are finally listening. Maybe we can get fewer running injuries in our office and get a day on the beach with this new trend. Thanks to all the minimalist companies out there ! Just remember, walking is a different neuro-biomechanical task than running. Heel striking is not abnormal in walking because the heel rocker phase of gait is softer than in running. Also, remember, some foot types (forefoot varus, Rothbart, etc) are not likely to do well in these more minimalistic shoes ( a more curved lasted shoe could drive a foot more medially into it’s incompetent parts). Get evaluated by someone who knows what they are doing (in the doctors office and in the shoe store, that could be tough to find) so that your foot type, your running style and your shoes match up. Injuries are part of this recipe when the ingredients do not mix well !