A marathon a day, for over 120 days…..on one leg, battling cancer.

So you think you are tough ? This guy was tough. A marathon a day for over 120 days…..on one leg, battling cancer. 

Rest in Peace Terry. You are not forgotten. You made a mark on my life, thank you for that. Watching you skip on the good leg, giving your prosthetic enough time to swing through mesmerized me, the biomechanics of it all. If i look back, this was the first time I payed attention with great detail to someone’s gait. I was in awe, you moved me, your mission moved me, your heart and spirit moved me. Your life made a difference in mine, so I may help others.Dr. Allen
Today, June 28th, every year here on The Gait Guys, I remember Terry Fox. Every year I post a reminder of perhaps one of the toughest dudes who ever lived. Today , this day, 1981 Terry Fox died. I grew up in Canada. I was barely a teenager when Terry began his plight, The Marathon of Hope. 

His mission, 26 miles a day, every day, until he had crossed the expanse of Canada to raise awareness for cancer. He made it an amazing 120+ days in a row, 3339 miles, one one leg, before his cancer returned. The whole country stood cheering watching him do something no mortal man would attempt, let along with one leg, and cancer. Today we pay a tribute to this true rockstar.
Let this video move you, just in case you think you are having a rough day.

https://www.youtube.com/watch?v=xjgTlCTluPA

Global body compensations in ACL deficient knees.

ALERT: Ok, this is big.
It is a huge comment on what the brain and reflexive patterns impart on posture and gait when perceived functional instability is present.
This study aimed to investigate the gait modification strategies of trunk over right stance phase in patients with right anterior cruciate ligament deficiency.
* Here is what you need to ABSOLUTLY keep in mind when you read it. The 3D capture it telling you what they are DOING to strategize, not what is WRONG or what needs CORRECTING (our mantra it seems, sorry to keep beating this concept to death). This again hits home what I have been preaching for quite some time, that arm swing (and you can translate that to trunk movements, thorax, head posture, breathing etc) should not be coached or corrected unless you are absolutely sure there are clean symmetrical lower limb biomechanics (yes, you can easily and correctly argue that you can concurrently work on all parts). IF there is something going awry in a lower limb, compensations will occur above, they have to occur. So be absolutely sure you are not making therapeutic interventions above without making therapeutic corrections below. If you are working on a shoulder/upper quarter problem and are not looking for drivers in the lower limbs or in gait, well … . . good luck making lasting effects. Other than breathing, it can be argued well that gait locomotion is our 2nd most engaged motor pattern that we have driven to subconscious levels , and compensations are abound (but not without a cost), so we can dual++ task.
If you want to dive deeper into this, search our blog and look for my articles on Anti-phasic gait. This is essentially what this study was looking at, and confirming, that there is a distortion in the NORMAL opposite phase movements (anti-phasic) of the “shoulder girdle” and “pelvic girdle” when something goes wrong in a lower limb.
- Dr. Allen

Findings from Shi et al when there was a chronic right ACL deficiency:
-trunk rotation with right shoulder trailing over the right stance phase was lower in all five motion patterns
- trunk posterior lean was higher from descending stairs to walking when the knee sagittal plane moment ended
- trunk lateral flexion to the left was higher when ascending stairs at the start of right knee coronal plane moment when descending stairs at the maximal knee coronal plane moment and when descending stairs at the end of the knee coronal plane moment
- trunk rotation with right shoulder forward was higher at the minimal knee transverse plane moment and when the knee transverse plane moment ended
- during walking, trunk rotation with right shoulder trailing was lower at other knee moments during other walking patterns

http://www.ncbi.nlm.nih.gov/pubmed/27131179

Feature: Arterial disease and cycling - VeloNews.com

“That offseason, his symptoms worsened. Before, it might have taken 20 minutes of riding at 400 watts to feel the sensation. Now, if he rode for five minutes at 350, he’d be riding with one good leg and one numb, powerless appendage.”

Iliac artery endofibrosis is a circulatory condition affecting the legs and is sending more and more cyclists under the knife.
If you are a bike geek like i am (been watching the Tour de France since i was 15) you may take interest in this. If you are a avid bike rider or triathlete you may take interest in this.
But do not stop at the bike when you have symptoms in front of you that sound vascular. If your leg is doing numb on a long walk or run, dead or heavy during exertion, something is going on that needs evaluated. Get evaluated.

Obesity and Base of Support

Recently we have been speaking and writing about “base of support” and how a narrow base of support will render a small comfort and control zone of balance in single leg tasking (walking, running, sports etc). We do not notice these things if we are standing on both feet or when walking or running per se, but all one needs to do is test a 30 second single leg stance to see how crappy one’s single limb base of support actually is. Most people will drift the pelvis laterally to get the single foot under the center of the body mass. This is a false support, it is a demonstration of weak support, unless you like to walk on a line/cross over gait. We should not have our knees rubbing together, scuffing our ankles or shoes together. If you do, you have a narrow base of support, have engrained a lazy style of locomotion, and you will wish and attempt to put the center of your body mass over the foot at all times. This is good if you are walking on ice, but that is about it. This is an epidemic, hence the prevalence of cross over gait out in the world. Increasing balance ability will help to increase base of support and hence help with reducing cross over gait (narrow step width gait and running) tendencies. Obesity seems to make this worse. Obesity in our world is wrecking our people, especially our kids.

“Alterations were detected in the intermittent postural control in obese children. According to the results obtained, active anticipatory control produces higher center of pressure displacement responses in obese children and the periods during which balance is maintained by passive control and reflex mechanisms are of shorter duration.”
“Differences in intermittent postural control between normal-weight and obese children ” Israel Villarrasa-Sapiña, Xavier García-Massó

http://www.gaitposture.com/article/S0966-6362(16)30091-1/abstract?platform=hootsuite

Kinetic chain transfer.

Anyone would be silly to disagree with this.
We go into some deeper reasoning back in this older blog post (https://tmblr.co/ZrRYjxTJ6zw9) looking at arm swing and leg swing and pairing of pelvis and shoulder posturing and how clean pelvis function parlays into upper body function in softball pitching.

“Proper utilization of the kinetic chain allows for efficient kinetic energy transfer from the proximal segments to the distal segments. Dysfunction at a proximal segment may lead to altered energy transfer and dysfunction at more distal segments,”

Lower body conditioning may cut upper body injury risk in softball. -Hank Black

http://lermagazine.com/special-section/pediatric-clinical-news/lower-body-conditioning-may-cut-upper-body-injury-risk-in-softball

Gait and Autism spectrum disorder (ASD).

Gait and autism spectrum disorder (ASD):
“ … overall findings of the studies conducted in the area are inconclusive … however, some results suggest an emerging pattern. The current perspective on gait patterns in children with ASD is that there are a number of deviations present in terms of temporospatial, kinematic, and kinetic parameters and that gait, along with other movement pattern changes, may be used to allow for earlier diagnosis of ASD. There is, however, some consensus regarding the involvement of the cerebellum and basal ganglia in children with ASD and the relationship with observed motor deficits. ” - Kindregan et al

http://www.hindawi.com/journals/aurt/2015/741480/

Gait and the lower visual field.

Gait and the eyes. We forget about the eyes. If you have vision issues, your gait may change.
Gaze during adaptive gait involving obstacle crossing is typically directed two or more steps ahead where as visual information of the “in the moment” swinging lower-limb and its relative position during the task is available in the lower visual field. This study determined exactly when visual information is utilised to control/update lead-limb swing trajectory during obstacle negotiation.
In this study, when the lower visual field was blocked out the foot-placement distance and toe-clearance became significantly increased, suggesting the brain overcorrecting for safety. A logical assumption. “These findings suggest that lower visual field input is typically used in an online manner to control/update final foot-placement, and that without such control, uncertainty regarding foot placement causes toe-clearance to be increased.”

http://www.ncbi.nlm.nih.gov/pubmed/22424759

Base of support and chronic ankle sprains

We spoke at length about “base of support” and how if you have a narrow base of support, you have a small comfort zone of balance in single leg tasking (walking, running, sports etc). If you have a narrow base of support, you will wish and attempt to put the center of your body mass over the foot at all times…….hence the cross over gait often times. Increasing balance ability will help to increase base of support and hence help with reducing cross over gait (narrow step width gait and running) tendencies.
* This study here showed that a SINGLE episode of single 30-minute training session involving kicking a ball while standing on 1 foot promoted changes in postural-control strategies in individuals with chronic ankle instabilty(CAI).
Does this translate to the assumption that “CAI clients will have a narrow step width, narrow base of support, and a cross over gait”? No, but if you are thinking that way, we want you on our team.

Changes in Postural Control After a Ball-Kicking Balance Exercise in Individuals With Chronic Ankle Instability. Marcio Jose dos Santos PhD, Josilene Conceição PT, MSc, Felipe Gustavo Schaefer de Araújo, Gilmar Moraes SantosPhD, John Keighley PhD

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Holy Leg Length discrepancy!

These pix come to us from one of our brethren, Dr Scott Tesoro in Carbondale of a 73 yr old golfer with mild LBP and a  L knee replacement three yrs ago. He has a VERY short R leg (close to an inch).

What you are seeing is he ultimate compensation for a short leg. Note how he takes the shorter side and supinates it (to the max!). You can see the external rotation of the lower leg and thigh to go along with it. If you look carefully and extrapolate how his left leg would look “neutral”, you can see he has internal tibial torsion on this (right) side as well. He has some increased midfoot pronation on the right compared to the left, but not an excessive amount.

A full length sole lift would probably be in order, as well as potentially addressing some of his compensations. Wow, what a great set of pictures !

Sounds like a bad ideaOrthotics, can be useful adjunct to care. They can be used to give people biomechanics that they do not have while you were trying to improve them and help to make up for ranges of motion which do not seem attainable.From the g…

Sounds like a bad idea

Orthotics, can be useful adjunct to care. They can be used to give people biomechanics that they do not have while you were trying to improve them and help to make up for ranges of motion which do not seem attainable.

From the gate cycle we know that after initial contact and loading response the calcaneus should start to evert. The calcaneus will continue to evert until it encounters something (like the lateral heel counter of the shoe). At mid stance it should be fully everted and as the opposite leg comes in to swing, begin to invert. The lateral heel counter assists in the inversion/supination process.

To our knowledge, flip-flops, even if they have an increased arch, do not have a lateral heel counter and therefore will promote further lateral excursion of the calcaneus while the medial longitudinal arch is collapsing  (i.e.: midfoot pronation). Go ahead and place your foot into inversion and see what happens to your heel. It’s slides laterally.

It’s also well-established that flip-flops, through flexion of the distal toes and engagement of the long flexor tendons, inhibits ankle rocker. It is often necessary to engage these muscles to keep the flip-flop from coming off. Lack of ankle rocker usually will inhibit hip extension and that can cause a constellation of problems.

Though engagement of the long flexors of the toes will have a partial anti-pronatory effect, this is not enough to counter the excessive heel  eversion which is happening.

We generally do not think the flip-flops are a great idea and telling someone that it’s “OK” to wear flip-flops as long as it has appropriate arch support, is silly.

So here is somewhat of a controversial subject.Perhaps, though not discussed in this article, activating more axial extensors (vestbulospinal pathways, things like your erector spinae) could be somewhat protective, in that it could, at least theoret…

So here is somewhat of a controversial subject.

Perhaps, though not discussed in this article, activating more axial extensors (vestbulospinal pathways, things like your erector spinae) could be somewhat protective, in that it could, at least theoretically, help to normalize flexor/extensor ratios in the lower extremity. 

We see flexor dominance (increased corticospinal activity) in many cases of lower extremity problems causing an imbalance. Perhaps activating extensors the lower extremity (tibialis interior, extensor digitorum longest, etc.) could explain, in part, some of these (controversial) results.

We’re not recommending or condoning taking up smoking to preserve your knees. This is merely food for thought in the ever-changing landscape of clinical application.


http://lermagazine.com/cover_story/smoking-knee-oa-from-clinical-controversy-to-therapeutic-possibility

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Pain on the outside of one leg, inside of the other. 

Whenever you see this pattern of discomfort, compensation is almost always at play and it is your job to sort it out. 

This patient presents with with right sided discomfort lateral aspect of the right fibula and in the left calf medially. Pain does not interfere with sleep.  He is a side sleeper 6 to 8 hours. His shoulders can become numb; left shoulder bothers him more than right.

PAST HISTORY: L shoulder surgery, rotator cuff with residual adhesive capsulitis. 

GAIT AND CLINICAL EVALUATION: see video. reveals an increased foot progression angle on the right side. Diminished arm swing from the right side. A definite body lean to the right upon weight bearing at midstance on that side.

He has external tibial torsion bi-lat., right greater than left with a right short leg which appears to be at least partially femoral. Bi-lat. femoral retrotorsion is present. Internal rotation approx. 4 to 6 degrees on each side. He has an uncompensated forefoot varus on the right hand side, partially compensated on the left. In standing, he pronates more on the left side through the midfoot. Ankle dorsiflexion is 5 degrees on each side. 

trigger points in the peroneus longus, gastroc (medial) and soles. 

Weak long toe extensors and short toe flexors; weak toe abductors. 

pathomechanics in the talk crural articulation b/l, superior tip/fib articulation on the right, SI joints b/l

WHAT WE THINK:  

1.    This patient has a leg length discrepancy right sided which is affecting his walking mechanics. He supinates this extremity as can be seen on video, especially at terminal stance/pre swing (ie toe off),  in an attempt to lengthen it; as a result, he has peroneal tendonitis on the right (peroneus is a plantar flexor supinator and dorsiflexor/supinator; see post here). The left medial gastroc is tender most likely due to trying to attenuate the midfoot pronation on the left (as it fires in an attempt to invert the calcaneus and create more supination). see here for gastroc info

2.    Left shoulder:  Frozen shoulder/injury may be playing into this as well as it is altering arm swing.

WHAT WE DID INITIALLY (key in mind, there is ALWAYS MORE we can do):    

  •  build intrinsic strength in his foot in attempt to work on getting the first ray down to the ground; EHB, the lift/spread/reach exercises to perform.
  • address the leg length discrepancy with a 3 mm sole lift
  • address pathomechanics with mobilization and manipulation. 
  • improve proprioception: one leg balancing work
  • needled the peroneus longus brevis as well as medial gastroc and soles. 
  • follow up in 1 week to 10 days.

Pretty straight forward, eh? Look for this pattern in your clients and patients

Ankle sprains and the reorganization of the sensorimotor system

“Our subjects with unilateral chronic ankle sprains had weaker hip abduction strength and less plantar-flexion range of motion on the involved sides. Clinicians should consider exercises to increase hip abduction strength when developing rehabilitation programs for patients with ankle sprains.”-Friel et al

Awhile back we wrote about the principle that if the hip abductors are weak, the leg will posture more adducted (ie, cross over type pattern) and this places the foot more directly below the body midline plumb, this will posture the foot in inversion and thus at greater risk for future inversion sprains.  This sets up the vicious cycle of hip abductor weakness, frontal plane drift of pelvis, inversion of the foot and more ankle sprain risks/events.  The cycle must be broken. The hip must be addressed. That lateral chain must be restored all the way up from the foot.  

Another newer study by Bowker discusses the somatosensory feedback necessary for postural adjustments, walking, and running stating that they may be hampered by a decrease in soleus spinal reflex excitability.  The study adds more validity to what we are all growing to know more clearly, that the central nervous system via supraspinal circuitry plays deeply into chronic ankle instability (CAI). The studies suggest that CAI may be more about coordination and control of dynamic stabilizers and changes in the motor neuron excitability rather than the function of static stabilizers.

“A successful reorganization of the sensorimotor system after an initial ankle sprain is the critical point when individuals suffer chronic ankle instability or become copers [individuals who do not develop chronic instability after an ankle sprain] who break the cycle of recurrent injuries and disabilities seen in CAI,” Masafumi Terada, PhD

According to LER and the Terada work, 

The slow-twitch fibers in the soleus muscle are mostly innervated by small alpha motoneurons, Terada explained, so the study findings suggest that some people may restore their ability to reflexively recruit alpha motoneurons after ankle injury, and some may not.

“Therapeutic interventions that can increase the H-reflex in the soleus may help to break the cycle of recurrent injuries and disabilities seen in CAI,” he said. “Lower-intensity transcutaneous electrical stimulation, joint manipulations, and reflex conditioning protocols may be effective in increasing the soleus spinal excitability.”

The Gait Guys


Reference:

CAI and the CNS: Excitability may influence instability. Larry Hand

http://lermagazine.com/news/in-the-moment-sports-medicine/cai-and-the-cns-excitability-may-influence-instability

Taken from original source:

Bowker S, Terada, M, Thomas AC, et al. Neural excitability and joint laxity in chronic ankle instability, coper, and control groups. J Athl Train 2016 Apr 11. [Epub ahead of print]

J Athl Train. 2006; 41(1): 74–78.PMCID: PMC1421486Ipsilateral Hip Abductor Weakness After Inversion Ankle SprainKaren Friel,Nancy McLean,Christine Myers, and Maria Caceres
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1421486/

Can you guess why this person has left-sided plantar fasciitis?This question probably seem somewhat rhetorical. Take a good look at these pedographs which provide us some excellent clues.First of all,  note how much pressure there is over the metata…

Can you guess why this person has left-sided plantar fasciitis?

This question probably seem somewhat rhetorical. Take a good look at these pedographs which provide us some excellent clues.

First of all,  note how much pressure there is over the metatarsal heads. This is usually a clue that people are lacking ankle rocker and pressuring these heads as the leg cantilevers forward.  This person definitely have a difficult time getting the first metatarsal head down to the ground.

Notice the overall size of the left foot compared to the right (right one is splayed or longer). This is due to keeping the foot and somewhat of a supinated posture to prevent excessive tension on the plantar fascia.

The increase splay of the right foot indicates more mid foot pronation and if you look carefully there is slightly more printing at the medial longitudinal arch. This is contributing to the clawing of the second third and fourth toes on the right. Stand up, overpronate your right foot and notice how your center of gravity (and me) move medially.The toes will often clench in an attempt to create stability.

The patient’s pain is mostly at the medial and lateral calcaneal facets, and within the substance of the quadratus plantae with weakness of that muscle and the extensor digitorum longus. She has 5° ankle dorsiflexion left and 10 degrees on the right and hip extension which is similar.

The lack of ankle rocker and hip extension or causing her to pronate through her midfoot, Tensioning are plantar fascia at the insertion. The problem is worse on the left and therefore that is where the symptoms are.

Pedographs can be useful tool in the diagnostic process and provide clues as to biomechanical faults in the gait cycle.

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Shoe Drop and its effects on the shoe itself

An interesting, free, full text article we ran across entitled: “THE EFFECT OF WALKING IN FOOTWEAR WITH VARYING HEELSOLE DIFFERENTIALS ON SHANK & FOOT SEGMENT KINEMATICS”

Not exactly a page turner but some important pearls to glean here.

CONCLUSION: During 0-50% gait cycle stance phase shank kinematics do not change with changes in Heel Sole Differential. Actual foot angles do change, increasing with increasing Heel Sole Differential of footwear and by the angle of pitch of the footwear.

In other words, the kinematics (read: flex and physical characteristics) of the shank (the platform that the shoe is built on) do not change with increased ramp delta (ie: “drop”, from heel to toe), but foot kinematics (ie: how the foot moves) DOES change.

http://www.oandp.org/publications/jop/2016/2016-020.pdf

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Short leg and mottling of the skin

Have you ever heard of Klippel-Trenaunay Syndrome? I hadn’t either, until I had a patient come in with low back pain and a gait issue and said she had it.

Evidently, in 1900, noted French physicians Klippel and Trenaunay first described a syndrome in 2 patients presenting with a port-wine stain and varicosities of an extremity associated with hypertrophy of the affected limb’s bony and soft tissue. Klippel-Trenaunay-Weber syndrome (KTWS) is characterized by a triad of port-wine stain, varicose veins, and bony and soft tissue hypertrophy involving an extremity (1).

Most cases KTWS are sporadic, although a few cases in the literature report an autosomal dominant pattern of inheritance (2). There is no racial predilection, even distribution between males and females and presents at birth or during early childhood (3). It generally affects a single extremity, although cases of multiple affected limbs have been reported. The leg is the most common site followed by the arms, the trunk, and rarely the head and the neck(4).

This patient had a history of low back pain with a recent epidural steroid injection. Exam highlights included a R sided leg length discrepancy approximately 5mm (tibial and femoral). Pelvic tilt to the right (for LLD) with anterior rotation of that side of the pelvis, posterior on the opposite side (counter clockwise pelvic distortion pattern). Lumbar flexion off 60/90 with all motion occurring in the lumbar spine (ie: no hip hinge), extension 20/30, lateral bending 30/45 BL with pain ipsilateral. Decreased low back endurance of <50 seconds in extension.

Right lower extremity was smaller (appeared hypoplastic) than left and had multiple discolorations in the skin (see pictures). L sided Q angle > R (12 vs 8 degrees). Less internal rotation of the right lower extremity compared to left, but with normal limits. Gait revealed a shift and hike to the right during stance phase with an increased arm swing on the right. Foot intrinsics were weak (lumbricals, EDL, FDB, dorsal intrerossei)

She walked in a pair of Chaco sandals with allowed much greater calcaneal eversion bilaterally R > L.

MRI revealed paraspinal marbling at the lower part of the lumbar spine, improving as you move rostrally. Small disc herniations at L3/4, 4/5, 5/S1, which did not effect the exiting nerve roots. Degenerative changes in the lumbar facet joints. There was no radiographic evidence of instability.

Impression:
It seems that she did not have enough intrinsic for the strength to stop calcaneal eversion in her Chaco’s and therefore this was causing increased foot pronation. This, combined with her leg length discrepancy, was contributing to increasing the lordosis in her lumbar spine, causing facet joint irritation. This was compounded by weakness and lack of endurance of the lumbar paraspinal musculature. The effects of the Klippel-Trenaunay Syndrome are evident with the IPO plasticity of the right lower extremity and accompanying musculoskeletal abnormalities.

What did we do?

  • Gave her endurance exercises for the lumbar spine.
  • Gave her propriosensorv exercises for the lumbar spine
  • Recommended she continue with the 5 mm sole lift.
  • Advised getting rid of the Chaco sandals as they allow too much calcaneal eversion and sticking to a shoe that has a stronger/larger heel counter.
  • acupuncture to improve circulation and proprioception as well as muscular function
  • we will monitor weekly for the next 4 to 6 weeks.

All in all, and interesting use with a little twist (not a torsion, of course!) : )


1. http://reference.medscape.com/article/1084257-overview
2. Ceballos-Quintal JM, Pinto-Escalante D, Castillo-Zapata I. A new case of Klippel-Trenaunay-Weber (KTW) syndrome: evidence of autosomal dominant inheritance. Am J Med Genet. 1996 Jun 14. 63(3):426-7.
3. Sung HM, Chung HY, Lee SJ, Lee JM, Huh S, Lee JW, et al. Clinical Experience of the Klippel-Trenaunay Syndrome. Arch Plast Surg. 2015 Sep. 42 (5):552-8.
4. http://reference.medscape.com/article/1084257-clinical

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Riding the inside edge of the sandal. Mystery hunting with Dr. Allen.

You can see it in the photo above, the heel is a third of the way off the sandal. (there are 2 photos provided today, find the arrow and tab to see both)

You either have it or have seen it. It is frustrating as hell if you have it. Your heel rides on only half of your flip flop or summer sandals. You do not notice it in shoes, only in sandals, typically ones without a back or back strap.  This is because the heel has no controlling factors to keep it confined on the rear of the  sandal sole. But there is a reason this happens to some, but not everyone. It is best you read on, this isn’t as simple as it might seem. 

These clients have restricted ankle rocker (dorsiflexion), restricted hip extension and/or adductor twist (if your reference is the direction the heel is moving towards). I could even make a biomechanical case that a hallux limitus could result in the same scenario. So what happens is that as the heel lifts and adducts it does not rise directly vertically off the sandal, it spins off medially from the “adductor twist” event. This event is largely from a torque effect on the limb from the impaired sagittal mechanics as described above, manifesting  at the moment of premature heel rise resulting in an slightly externally rotating limb (adducting heel). The sandal eventually departs the ground after the heel has risen, but the sandal will rise posturing slightly more laterally ( you can clearly see this on the swing leg foot in the air, the sandal remains laterally postured). Thus, on the very next step, the sandal is not entirely reoriented with its rear foot under the heel, and the event repeats itself. The sandal is slightly more lateral at the rear foot, but to the wearer, we believe it is our heel that is more medial because that is the way it appears on the rear of the sandal or flip flop.  Optical illusion, kind of… . . a resultant biomechanical illusion is more like it.

You will also see this one all over the map during the winter months in teenagers who swear by their Uggs and other similar footwear, as you can see in the 2nd photo above. This is not an Ugg or flip flop problem though, this is often a biomechanical foot challenge that is not met by a supportive heel counter and may be a product of excessive rear foot eversion as well.  This does not translate to a “stable” enough shoe or boot, that is not what this is about. This is about a rearfoot that moves to its biomechanical happy place as a result of poor or unclean limb and foot biomechanics and because the foot wear does not have a firm stable and controlling heel counter.  The heel counter has several functions, it grabs the heel during heel rise so that the shoe goes with the foot, it give the everting rearfoot/heel something to press against, and as we have suggested today, it helps to keep the rearfoot centered over the shoe platform.  To be clear however, the necessary overuse and gripping of the long toe flexors to keep flip flops and backless sandals on our feet during the late stance and swing phases of gait, clearly magnifies these biomechanical aberrations that bring on the “half heel on, half heel off” syndrome.

There you have it. Another solution to a mystery in life that plagues millions of folks. 

Dr. Shawn Allen, mystery hunter, and one of the gait guys.

Treadmills, motorized or nonmotorized can have some pitfalls. Here are seven of our biggest concerns.

More on non motorized treads from Mike Reinold which came to my attention via Scott Tesoro (thanks!).

1. Watch out for how much ankle dorsiflexion(and great toe extension) your client has to be able to take advantage of the “curve”

2. The treadmill, whether motorized or not, is constantly moving, opposite the direction of travel. With the foot on the ground, this provides a constant rate of change of length of the gastroc/soleus (ie, it is putting it through a slow stretch); so, once the muscle is activated, it contracts for a longer period of time because of the treadmill putting a slow stretch on the gastroc and soleus.

3. The moving deck also has a tendency to put the ankle in dorsiflexion ( see point number one) initiating a stretch reflex in the tricep surae (gastroc/soleus) facilitating toe off through here and pushing you through the gait cycle, rather than pulling you through (with your hip extensors).

4. Likewise, the treadmill pulls the hip into extension and places a pull on the anterior hip musculature, especially the hip flexors including the rectus femoris, iliopsoas and iliacus. This causes a slow stretch of the muscle, activating the muscle spindles (Ia afferents) and causing a mm contraction (ie the stretch reflex). This acts to inhibit the posterior compartment of hip  extensors through reciprocal inhibition, especially the glute max, making it difficult to fire them.

5. Because the deck is moving, the knee is brought into extension, with stretch of the hamstrings, the quads become reciprocally inhibited.

6.  the moving deck forces you to flex the thigh forward for the next footstrike (ie footstance), firing the RF, IP and Iliacus, and reciprocally inhibit the g max

7. If your core isn’t engaged, the pull of the rectus femoris and iliopsoas/iliacus pulls the ilia and pelvis into extension (ie increases the lordosis) and you reciprocally inhibit the erectors and increase reliance on the multifidus and rotatores, which have short lever arms and are supposed to be more proprioceptive in function.

We are not saying they are bad and in fact, we tend to like self-propelled models more than motorized ones  and agree with many of the points made. We are just saying that treadmills are not the same as walking on a flat surface and approximate but do not simulate actual gait.

Podcast 107: Unilateral Training: Warping the Nervous System

Plus: Changing an existing orthotic to make it work, Meniscal tear truths, Shoe Insole truths, Plantar Pressures

Show Sponsors:

softscience.com
Altrarunning.com

Other Gait Guys stuff

A. Podcast links:

http://traffic.libsyn.com/thegaitguys/pod_107f.mp3

http://thegaitguys.libsyn.com/episode-107-0

B. iTunes link:
https://itunes.apple.com/us/podcast/the-gait-guys-podcast/id559864138

C. Gait Guys online /download store (National Shoe Fit Certification & more !)
http://store.payloadz.com/results/results.aspx?m=80204

D. other web based Gait Guys lectures:
Monthly lectures at : www.onlinece.com type in Dr. Waerlop or Dr. Allen, ”Biomechanics”

-Our Book: Pedographs and Gait Analysis and Clinical Case Studies
Electronic copies available here:

-Amazon/Kindle:
http://www.amazon.com/Pedographs-Gait-Analysis-Clinical-Studies-ebook/dp/B00AC18M3E

-Barnes and Noble / Nook Reader:
http://www.barnesandnoble.com/w/pedographs-and-gait-analysis-ivo-waerlop-and-shawn-allen/1112754833?ean=9781466953895

https://itunes.apple.com/us/book/pedographs-and-gait-analysis/id554516085?mt=11

-Hardcopy available from our publisher:
http://bookstore.trafford.com/Products/SKU-000155825/Pedographs-and-Gait-Analysis.aspx

________________________

Show Notes:

Running helps mice slow cancer growth
https://www.sciencedaily.com/releases/2016/02/160216142825.htm

The future of Wearables
http://readwrite.com/2016/02/19/future-of-wearables

mensicus surgery is dead ?
http://www.regenexx.com/should-i-have-meniscus-surgery/#

Why you should be training your CNS
http://www.outsideonline.com/2055066/cross-educate-your-body#article-2055066

The business of insoles
http://www.outsideonline.com/2057156/business-insoles-support-system-or-super-rip

Altered plantar pressures
http://link.springer.com/article/10.1007%2Fs00167-016-4015-3