More on landing mechanics.
Here is a recent article on landing mechanics. This article talks about the landing mechanics far past where I feel the first stage of vulnerability is, which is initial forefoot load, as i discuss in the video pertaining to landing from a jump or if sprinting (forefoot loading). IF landing occurs in low gear (lateral half of the forefoot), inversion risks are higher.
The medial foot tripod, high gear toe off (1st and 2nd mets) is where we should be taking off from, and landing initially upon. Anything lateral is vulnerable without the lateral column strength (lateral gastrocsoleus complex, peronei longus/brevis).
This article talks about knee flexion angles and ACL vulnerability, far after this initial loading response. The article some valid conclusions in that phase.

– Dr. Shawn Allen

Posture specific strength and landing mechanics.

http://lermagazine.com/article/posture-specific-strength-and-landing-mechanics

https://www.youtube.com/watch?v=8T9UzOaYxmo

The effect of lower extremity fatigue on shock attenuation during single-leg landing.

Thank goodness the body can compensate. Here is a perfect example of this discussed in this study.
“ … it has been shown that a fatigued muscle decreases the body’s ability to attenuate shock from running. The purpose of the study was to determine the effect of lower extremity fatigue on shock attenuation and joint mechanics during a single-leg drop landing.”
This study suggests that as one part fatigued, the joint and muscle strategies elsewhere in the limb made up for it.
“Hip and knee flexion increased and ankle plantarflexion decreased at touchdown with fatigue. Hip joint work increased and ankle work decreased.” The results suggested that the lower extremity is able to adapt to fatigue though altering kinematics at impact and redistributing work to larger proximal muscles.

The effect of lower extremity fatigue on shock attenuation during single-leg landing. Clin Biomech (Bristol, Avon). 2006 Dec;21(10):1090-7. Epub 2006 Sep 1.
Coventry E1, O’Connor KM, Hart BA, Earl JE, Ebersole KT.
http://www.ncbi.nlm.nih.gov/pubmed/16949185

Podcast 91: Gait, Vision & some truths about leg length discrepancies

Show sponsors:
www.newbalancechicago.com

A. Link to our server:
http://traffic.libsyn.com/thegaitguys/pod_91f.mp3

Direct Download:
http://thegaitguys.libsyn.com/91

Other Gait Guys stuff

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

C. Gait Guys online /download store (National Shoe Fit Certification and 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:

Gait and vision: Gaze Fixation
What’s Up With That: Birds Bob Their Heads When They Walk
http://www.wired.com/2015/01/whats-birds-bob-heads-walk/
 
Shod vs unshod
 
Short leg talk:
11 strategies to negotiate around a leg length discrepancy

From a Reader:

Dear Gait Guys, Dr. Shawn and Dr. Ivo,  I was referred to this post of yours on hip IR…http://thegaitguys.tumblr.com/post/14262793786/gait-problem-the-solitary-externally-rotated   I am impressed by the level of details of your understanding of the gait and biomechanics. Although I am still trying to understand all of your points in this post, I would like to ask you:  What if my IR is limited due to a structural issue? The acetabular retroversion of the right hip in my case. 

I.e. if I am structurally unable to rotate the hip internally.
What will happen? 
What would be a solution to the problem in that case? 

Single-leg drop landing movement strategies 6 months following first-time acute lateral ankle sprain injury – Doherty – 2014 – Scandinavian Journal of Medicine & Science in Sports
http://onlinelibrary.wiley.com/doi/10.1111/sms.12390/abstract

Hey Gait Guys,

I understand that 1st MP Joint dorsiflexion, ankle rocker, and hip extension are 3 key factors for moving in the sagittal plane from your blog and podcasts so far. I really love how you guys drill in our heads to increase anterior strength to increase posterior length to further ankle rocker. I’ve seen the shuffle gait and was curious if you had a good hip extension exercise to really activate the posterior hip extensors and increase anterior length. 

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.


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.

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