Is SALRE a "Single Axis Theory"

Thanks for all of the concern. The car situation was not addressed today because I had visiting engineers from Utah fly in to discuss technological directions of research for the future. Fabulous Day. Very positive.

While this thread was going on, I was contemplating how to present these ideas, but I think I will start a new thread to discuss the Relative Importance of the Subtalar Joint Axis and Subtalar joint motion.

I want to Thank all of you that have participated. I apologize if I have insulted anyone. I understand and accept that many practitioners use SALRE as a part of Tissue Stress model.
I also understand that the STJ axis is one axis that translates slightly in the open chain and we will discuss its translation in the closed chain. I have read Van Laangaalan article. It was a while ago. I understand the bundle of axes concept. Each is a translational position of the same singular STJ axis in a well done cadaver study. I really appreciate guys like Van Laangaalan who collect this data and crunch it so well.

Ed

 

Great You Tube video Simon! I'm a huge fan of Jethro Tull.

I actually have the studio album which that title track is on and the live album 'Bursting Out'.

Fabulous - thanks again!!

Regards,

Eric. :drinks

 

Thanks Ed.

Please accept my apologies also for those posts where I let myself go. If you are a big enough man to apologise then I can be too.

By all means start your new thread. Perhaps we can all make a new start and keep it civil and constructive, to everyone's benefit.

Lets be honest, this thread has become more about point scoring than biomechanics! Lets make the next one respectful and open minded. That way we may ALL learn something!

Respectfully
Robert

 

David,

There have been multi-segment foot model studies revealing significant gait kinematic differences in the joints distal to the calcaneus between participants with different foot postures. Both expected and unexpected differences, which as you mention are worthy of digestion in the context of foot posture and kinematic differences.
Regards,
Stu

Cobb SC, Tis LL, Johnson JT, Wang YT, Geil MD, McCarty FA. The effect of low-mobile foot posture on multi-segment medial foot model gait kinematics. Gait Posture 2009 October;30(3):334-9.Results revealed significantly decreased LMF group CNC abduction excursion (p=0.047) during midstance. During pre-swing, LMF group RC inversion excursion was significantly increased (p=0.032) and eversion excursion was significantly decreased (p=0.003) compared to the TYPF group. When these differences are considered in conjunction with the kinematic patterns of other foot/leg segments and functional articulations, the changes may suggest dysfunction of normal leg-calcaneus coupling and the constrained tarsal mechanism associated with low-mobile foot postures

Hunt AE, Smith RM. Mechanics and control of the flat versus normal foot during the stance phase of walking. Clin Biomech 2004 May;19(4):391-7.RESULTS: In the pes planus group: the forefoot was less adducted (P < .05) at toe-off, and total transverse plane range of motion, at 8 degrees versus 10 degrees, was less (P < .01); the peak plantarflexor ankle moment at push-off was greater (P < .05); the invertor moment was greater at foot flat (P < .05); for the EMG profiles, activity early in stance, relative to the mean stance phase activity was higher (P < .01) in tibialis anterior and lower (P < .05) in the peronei, soleus and medial and lateral gastrocnemius.CONCLUSIONS: Despite reaching statistical significance, the group differences were small for the task of laboratory walking at a natural pace. The main implications of the differences were for restraint of motion. The expectations of excessive motion and muscle effort in the pes planus group were therefore not substantiated.

Houck JR, Tome JM, Nawoczenski DA. Subtalar neutral position as an offset for a kinematic model of the foot during walking. Gait Posture 2008 July;28(1):29-37.Utilizing STN as the offset resulted in a significant increase in rearfoot eversion (p=0.019) during early stance, and greater first metatarsal dorsiflexion (p<0.007) across stance in the pronated foot groups that was not observed prior to applying the offset. When applied to subjects with differing foot postures, the selection of a common reference position that is both clinically appropriate and reliable may distinguish kinematic patterns during walking that are consistent with theories of abnormal pronation.