Sometimes too much shoe is too much...

Minimalist. Maximalist. Neutral. Sometimes you need to earn your way into a shoe. After all, a shoe is supposed to direct and guide your foot to better (more optimal?) mechanics, not necessarily create more work for it. The literature seems to point to maximalist shoes changing lower extremity kinematics and increasing impact forces. The body needs to have the ability to “attenuate“ these impact forces, otherwise problems could potentially arise.

Take a good look at this gal. She is having a heck of a time trying to control what her mechanics are doing in this maximalist shoe. She demonstrates poor control of the foot, as well as the knee and hip.

By design, the shoe has a thicker outsole and forefoot flare (ie: The front of the shoe is wider at the sole than it is at the interface of the foot with it). This can create accelerated forefoot pronation as you see here with the medial aspect of the foot “slapping“ down on the ground. This creates a large valgus moment at the knee, which is further accentuated by her external tibial torsion, greater on the left. Also notice the pelvic dip on the left on the right foot hits the ground; less so on the right side when the left foot strikes. Looking up the chain and as a whole, you can see that this is poor control and could potentially contribute to at the mechanics at the ankle, knee and hip. Not sure if you can see it but she also has an increase in her lumbar lordosis, diminishing her ability to be able to use her abdominal core to help to stabilize.

If she were to continue to want to utilize the shoe, we would need to work on core strength, hip stability and most likely, forefoot motion (so that she can get her first ray complex to the ground at the first metatarsal phalangeal joint), before she “earns her way” into this shoe.

Dr Ivo Waerlop, one of The Gait Guys

Kulmala JP, Kosonen J, Nurminen J, Avela J.Running in highly cushioned shoes increases leg stiffness and amplifies impact loading. Sci Rep. 2018 Nov 30;8(1):17496. FREE FULL TEXT

Law MHC, Choi EMF, Law SHY, Chan SSC, Wong SMS, Ching ECK, Chan ZYS, Zhang JH, Lam GWK, Lau FOY, Cheung RTH. Effects of footwear midsole thickness on running biomechanics. J Sports Sci. 2019 May;37(9):1004-1010

Chan ZYS, Au IPH, Lau FOY, Ching ECK, Zhang JH, Cheung RTH. Does maximalist footwear lower impact loading during level ground and downhill running? Eur J Sport Sci. 2018 Sep;18(8):1083-1089.

Sinclair J, Richards J, Selfe J, Fau-Goodwin J, Shore H.The Influence of Minimalist and Maximalist Footwear on Patellofemoral Kinetics During Running.J Appl Biomech. 2016 Aug;32(4):359-64. 

Chambon N, Delattre N, Guéguen N, Berton E, Rao G. Is midsole thickness a key parameter for the running pattern? Gait Posture. 2014;40(1):58-63

#runnning #gait #biomechanics #maximalistshoes #midsolethickness #gaitanalysis #thegaitguys

Can you spot the problem?

Take a look at the pictures before proceeding, knowing that this gal presented with L sided outside knee pain and see if you can tell what may be wrong. She does wear orthotics. 

Take a good look at the lateral flare on each of these shoes. Yes, it is a Brooks Pure series with a 4mm drop. Yes the shoe has a medial (sl larger) and lateral flare, posteriorly and anteriorly.

Do you see the discoloration and increased wear on the lateral heel counter on the left compared to the left? There is also increased wear of the lugs on the outside of this left shoe. The forefoot is also worn into slight varus, but this difficult to see. The shoe, especially in combination with her orthotic, is keeping her in varus (ie inverted) for too long, taking her knee outside the saggital plane and contributing to her knee pain. 

ROTATE YOUR SHOES!

tumblr_m26k4jbWrG1qhko2so1_1280.png
tumblr_m26k4jbWrG1qhko2so2_500.png
tumblr_m26k4jbWrG1qhko2so3_250.jpg

Retail Focus Thursday: The Lateral Flare

We recall that The lateral flare is part of the outsole, where it is elongated laterally (as opposed to medially, as in a medially flared shoe), to create stability.

Look at the above example (left above). Notice how the cushioning is different at the lateral aspect of the outsole; in this case: two densities. In this case, Nike Cesium, there is no lateral flare but plenty of entry zone cushion !  In this case this is to “ease the foot into pronation” (keep the foot longer in supination) and is considered a motion control feature (along with dual density midsoles and torsional rigidity, among others).

The typical lateral flare however, as seen in the middle picture drawing, can be a good thing and acts differently than the soft lateral entry zone of the Cesium above. The typical lateral flare will help to pronate the rearfoot, helping minimize the risk for ankle inversion; something you do not want especially when trail running where heel strike is sometimes more pronounced. The Nike above on the other hand, without the lateral flare, will keep the foot in supination longer, and tends to increase stresses to the lateral column of the foot.  Not a good trail running shoe example !

Typical lateral flares, speed up initial pronation (when walking we usually strike on the outside of the heel, as do some heel strike runners.  The flare creates a greater distance to travel in the same amount of time; again; see center pic above). It does not appear to increase total pronation or affect impact forces. It is a good idea for one problem, but often creates another. Not everyone can handle an increased speed of pronation effectively: these folks need to suddenly decelerate the medially spinning leg. What will do that? Most likely the glutes (max and medius); the vastus medialis (contracting eccentrically) and the anterior leg muscles (like the tibialis anterior, extensor digitiorum longus, extensor hallucis longus). You have probably been reading our posts for some time now. How many individuals have competency in these muscles? Not many.

Regarding the lack of lateral flare in the Nike shoe above, this feature has a tendency to “close” the knee medially and “open “it laterally. On the other hand, a typical laterally flared shoe will open the medial knee joint line and close the lateral but this does depend on the degree of tibial torsion and varum.  These lateral flare issues need to be strongly thought out when prescribing a shoe for a client.  This can be a double edged sword. Arthritis is most likely going to effect the medial (inside) knee 1st so you will want to chose a shoe that does not compress that medial knee.  

The bottom line? Proceed with caution with ANY shoe that has a motion control feature and know what you are recommending.

A little lost? Have no fear;  the complete shoe fit program (with IFGEC certification if desired) is coming in the next few months. Watch here, on Facebook or Twitter for the announcement. What is the IFGEC you ask ? “The International Foot & Gait Education Council” , a group of experts brought together from around the world in a combined braintrust to further foot, gait, running form and shoe forward thinking.

The Gait Guys…Shoe Geeks Extroidinaire. Helping you help your clients make better shoe choices