Shoesday Tuesday:


Shoe News You Can Use: The Shank

Look at the “skeleton” in the photo on the left. Now look at the black material above the white area of the midsole (above the outsole) on the right. This is the “shank” of the shoe. The shank is the stiff area of the shoe between the heel to the transverse tarsal joint. It should correspond to the medial longitudinal arch of the foot. It is designed (along with the midsole material: see post here), to provide additional torsional rigidity to the shoe and helps to limit the amount of pronation and motion at the subtalar and mid tarsal joints. It also acts as a “plate” between the outsole and ininsole to provide protection to the foot from rocks, sticks, broken glass, shrapnel and small animals : ).


Not all shoes have a shank, so it may not always be present. We usually dissect shoes sent to us so we can see what they are all about if the manufacturer or rep is unable to provide us with an “exploded” or sectioned model. Look for our take on the new SKORA soon, complete with a dissected version!


The Gait Guys. Making sure you know what you need to so you can make more educated decisions




all material copyright 2012 The Homunculus Group/ The Gait Guys. Please ask to use our stuff. If you don’t, you have to deal with Lee. You don’t want to deal with Lee….

The Dual Density Foam Running Shoe.

This goes along nicely with yesterdays post. Note the photo attached. This is a great example of something we all see everyday. A laterally tipped foot in a stability shoe.  Clearly a shoe that has been mis-prescribed for the wrong reason. Or has it ?

This client is clearly tipped laterally in the shoe, forcing supination.  Did this client self fit the shoe themselves in a discount store ? Were they fitted in a retail running store ? Where did things go wrong ? Or did they ?  The initial knee jerk reaction is to say this is the wrong shoe for this client.  Lets go a little deeper and ask some harder questions and see if you are considering some alternatives.

The assumption is frequently one of, “you are a hyperpronator so you need a stability shoe”. In this case is this person a hyperpronator ?  There is no way to know, not in the shoe.  On initial knee jerk observation this looks like a supinator in a stability shoe, a poor match.  But read on …

1. What if this person has significant flat feet, pes planus with severe pronation problems, but they find the stability they need by standing on the outer edge of the foot in the mechanically locked out position (supination).  Perhaps this is a less fatiguing posture, perhaps a less painful posture. This is often a comfort thing for hyperpronators to display.  What you see is not always what you get because there are two types of feet, those that drop or collapse into the weakness and those that fight the collapse and weakness the whole way via an alternative compensation.  You cannot tell by looking, certainly not from this picture of someone in a shoe. There must be a functional assessment and some gait evaluation. 

2. There exists the high arched flexible foot that pronates excessively, quickly and for a long time (this is the flexible cavus foot) and then there is the high arched rigid foot (the equinovarus foot).  The first described foot may need support from a stability shoe even though they have a high arch on presentation/examination and the later described foot can often go right into a neutral non-supportive shoe.  Can you tell either of these from this picture ? No you cannot.

3. Maybe the person in the photo has tibial varum (bowed lower leg) combined with a rearfoot varus and forefoot varus. This could mean they pronate heavily through the midfoot-forefoot and less so through the rearfoot-midfoot. In this case they are still a heavy pronator but not through what is typically noted or detected by significant medial arch collapse.  In this case the dual density shoe is not going to help all that much because the pronation is occurring mostly after the bulk of the shoe’s dual density stability foam has been passed through by the foot. Can this be detected by this photo ? Again the answer is no. The shoe fitter needs to be clinically aware that this type of client needs a forefoot varus posted shoe to help post up that medial tripod (1st metatarsal head).

4. Maybe, just maybe this is a typical rearfoot-midfoot pronating client, excessive mind you, and all they need is some foot and gait retraining to break their old compensation pattern of lateral weight bearing (standing or walking) and with this correct shoe they can then engage a healthier motor pattern. 

Which is it ?

Do you know how to navigate your way through these issues to make the right decision ?  There is no way to know here without seeing the foot naked and moving across the floor, and with a clinical examination to boot.

You can get all these things through our National Shoe Fit Certification program found here.

LINK:  http://store.payloadz.com/results/results.aspx?advsearch=1&m=80204

Email us and we will share the necessary info to get you started.  thegaitguys@gmail.com

Shawn and Ivo, The Gait Guys

Shoe News you can use….

The Midsole

Last time we talked about the outsole (see here and here if you missed it or need a review). Today we will focus on the midsole.

The Midsole, sandwiched between the outsole and the upper, provides torsional rigidity to a shoe. They can be single (uni) density (left picture) or multiple (middle picture).

Midsole material is very important, as it will accommodate to the load imposed on it from the person as well as any gear they may be carrying. It serves as the intermediary and transducer for load transfer between the ground and the person.  Softer density material in the heel of the shoe, like in the blue lateral side of the shoe in the bottom picture, softens the forces acting at heel strike and is good for impact and shock absorption.

Because the midsole tranduces forces and provides torsional rigidity (picture on right). The stiffer the material, the more motion control it provides.  Midsoles like the one in the center are made with materials of differing densities (white is softer, light grey more dense, dark gray, most dense) to absorb force and decrease the velocity of pronation during heel strike and mid stance, with a firmer material medially that protects against overpronation as you come through mid stance and go through toe off.


Wow. Shoe anatomy for the day. Knew this? Great! Lost? Want to know more? Download our Shoe Fit Certification program by clicking here. You can also email us for more information about becoming IFGEC certified in shoe fit: thegaitguys@gmail.com


Ivo and Shawn. Bald. Handsome. Knowledgeable. The Gait Guys!

Certification. See what your peers are saying….

“The shoe fit certification program is a must for anyone who wants to take their knowledge base of shoes, foot types and how they interact to the next level. The program is detailed, thorough, and the test will make sure you know this cutting edge material. 

If you are a doctor or therapist that treats foot or other lower extremities disorders, this information will help ensure the patients you treat are in the right shoe to assist them in their healing process and help prevent future problems.  If you are a shoe retailer, it will give you the confidence you are putting the right shoes on your customer’s feet to minimize complaints and unwanted returns.  The retail practice of simply looking at a customer’s feet while standing, asking them their shoe size, and pulling a shoe off the shelf has gone by the wayside in light of this new information.
If your profession involves shoes or feet, the information contained in this program is priceless!”
   
Ryan D. Hamm, D.C.

Corrective Chiropractic Center
612 E. Golf Road
Arlington Heights, IL 60005
Specializing in the Conservative Treatment of Musculoskeletal Disorders of the Spine and Extremities

Podcast #16: Monkeys, Newton Shoes & Gait Vision

Gait, running, Newton Shoes, Forefoot Strike, Gait Software, limb torsion problems, foot tripod and lots more !

LINK: http://thegaitguys.libsyn.com/podcast-16-monkeys-newtons-gait-vision

Join us today for the following topic list and show note links:

Links to DVD’s & e-downloads: http://store.payloadz.com/results/results.asp?m=80204

1- scars of evolution:

Bigfoot blog post:    http://thegaitguys.tumblr.com/day/2011/11/05

Why gait must be taught slowly. Even running gait must be taught slowly.

2- email from a reader

wondering if you had any internal femoral torsion videos? I have been looking online and noticed most of the articles were on children with IFT. I have internal femoral rotation, a “winking patella” and I believe an externally rotated tibia? I am a runner and I am trying to find some more info on my awesome gait:) As you can imagine, I have had my fair share of injuries from running (hip, knee, and foot) and I have tried foam rolling but I am hoping you have some other recommendations

3- The Almighty Foot Tripod exercise – good for pronation of the foot

4- DISCLAIMER: We are not your doctors so anything you hear here should not be taken as medical advice. For that you need to visit YOUR doctors and ask them the questions. We have not examined you, we do not know you, we know very little about your medical status. So, do not hold us responsible for taking our advice when we have just told you not to !  Again, we are NOT your doctors

5- Blog post we liked recently:  Perception/vision and Gait analysis software.

http://thegaitguys.tumblr.com/search/vision

2 blog posts here…….review them before the pod

The Observation Effect:   http://www.sciencedaily.com/releases/1998/02/980227055013.htm

6- SHOE TALK:   Skora Shoes
7- Our dvd’s and efile downloads
Are all on payloadz. Link is in the show notes.
Link: http://store.payloadz.com/results/results.asp?m=80204

Foot Types and Shoe Selection, anyone?

Join Dr Allen in this excerpt from the National Shoe Fit Certification Program. Need to know more about foot types? Consider taking the program. Want to take it a step further? Get Certified!

email us at: thegaitguys@gmail.com for more details.