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Is lack of arch recoil more important than over pronation?

Discussion in 'Biomechanics, Sports and Foot orthoses' started by scotfoot, Apr 21, 2024.

  1. scotfoot

    scotfoot Well-Known Member


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    Is lack of adequate arch recoil during gait as important or even more important than the degree of pronation?

    Recently, Welte, Rainbow et al demonstrate that lack of arch recoil during gait can lead to a tibia which "tilts to far fowards during late stance " , my words, and "can adversely affect the entire kinetic chain, foot to head" again my words.

    This piece of work may provided the key to improving many of the skeletal problems encountered by health care professionals.

    So how do you improve arch recoil ?

    1
    Prevent the foot from getting into a very deep pronation which it can't easily get out of , so perhaps some form of arch support. (A bit like half squats rather than full depth )

    2
    Strengthen the tissues that assist with arch recoil . The intrinsic foot muscles would be the obvious target here . So we are looking at muscle which span the full arch or cross at least one joint in the medial arch of the foot.
    These would include abductor hallucis, adductor hallucis , flexor digitorum brevis, flexor hallucis brevis etc

    3
    Improve arch flexibility esp at cuneonavicular joint.

    Note . IMO it is important that the toe flexors become properly active at heel off . So, more retro shoes with reduced toe spring and flexible soles.

    If you have PFP it may well be related to lack of arch recoil and excessive "tibial tilt" . Perhaps some running styles are effective at reducing injury because they mitigate the limitations of poor arch recoil.

    Welte et al https://www.frontiersin.org/articles/10.3389/fbioe.2023.1155439/full
     
  2. scotfoot

    scotfoot Well-Known Member

    Research shows that if we move from a modern shoe with a stiff sole and a toe spring, to a shoe without these features, the toe flexor power will get increase by about 60% . In all likelihood the foot will go back to its previous strength levels if the shoes are swapped back.

    It seems logical that if we wish the intrinsics to contribute more to reducing stress in the plantar fascia, and facilitate arch recoil, we need to strengthen the intrinsics and encourage them to activate. Modern shoes likely reduce intrinsic activity regardless of starting strength.

    IMO, more minimal shoes, like deck shoes, will encourage the toes to press down more during gait, which will help support the medial longitudinal arch and aid arch recoil.
     
  3. scotfoot

    scotfoot Well-Known Member

    The intrinsic foot muscles will contribute to arch recoil dependent on their strength and degree of activation . It seems fair to assume that arch recoil does not lead to strengthening of the intrinsics, in and of itself.

    Tasks other than arch recoil strengthen the intrinsics which contribute to recoil. Likely IMO , weak intrinsics> less recoil> increased tibial tilt> alternative gait strategies> skeletal pain over time esp with runners.
     
  4. scotfoot

    scotfoot Well-Known Member

    IMO, it may not be so much flat feet that cause problems but rather the failure of the foot to form an arch during toe off to give a "properly" orientated tibia. A person may have congenital flat feet when viewed in a standing position, however, so long as positive work from the foot gives an arch during the later part of gait, the tibia will still be within the optimal functional zone and not tilted forwards like a chimpanzee's.

    So a person may have " flat feet" but no functional problems/pain because the foot has a medial arch during toe off. Conversely, a person may have a distinct medial arch when they are standing still but no arch through toe off since the foot is weak and or inflexible.

    Potential gold from Welte, Rainbow et al in their paper https://doi.org/10.3389/fbioe.2023.1155439…
     
  5. scotfoot

    scotfoot Well-Known Member

    The windlass mechanism will also contribute significantly to arc recoil through toe off . As the toes dorsiflex so the PF will wind around the heads of the metatarsals helping to reform the medial arch. This is likely going to be negatively influenced by toe springs which reduce toe dorsiflexion through the later stages of gait.
     
  6. Dan T

    Dan T Active Member

    Be difficult to establish a tibia being, "too far forward" as a causative mechanism for any msk injury beyond the knee. Especially as tissues will adapt to most things if the dose doesn't exceed capacity. In fact 'knees over toes training', is a popular training modality amongst barefoot/CrossFit crowds currently who you suggest will have the strongest intrinsic musculature.

    Would also be difficult to explain why the vast majority of elite athletes and weekend warriors alike remain injury free wearing traditional sports shoes.

    Likely it would be patient specific and I would accommodate increasing capacity for loads needed barefoot in athletes performing barefoot. A lot of bold claims going into minimalist shoes for intrinsic strength. I often see people who just aren't biomechanically sound on a 90 degree plane 24/7 in a minimalist shoe and would actually benefit from Orthoses/footwear to mitigate load and allow greater recovery/capacity when performing their chosen endeavour.

    A bloke running 10k twice a week and jumping rope twice a week wearing a plush hoka shoe will almost certainly have stronger intrinsics than some hippie in a barefoot shoe wiggling his toes around I'll wait for the RCT on that one though
     
  7. scotfoot

    scotfoot Well-Known Member

    Why beyond the knee ?

    Not really relevant in the present context.

    Not actually true .

    Are shoes with a flexible sole and a reduced toe spring "minimal" . Note I have included arch support as a potentially good thing with regard to arch recoil. I am advocating stronger intrinsics and shoes which allow them to function.


    That's not what the research, including already published RCTs, is indicating.
     
  8. scotfoot

    scotfoot Well-Known Member

    Another research group very recently looked at arch recoil ( they referred to this as arch raising ) during gait but instead of talus position they looked at pelvis position.

    Their findings illustrate just how important arch recoil is. IMO, one exercise, doming ( basically the short foot exercise but allowing the toes to press down ) will activate most of the muscles which help arch recoil.

    They said -
    "We observed that the MJC plantarflexion (arch raising) during the midstance and late stance leads the pelvis backward, avoiding excessive forward displacement. "

    What happens at the foot affects the entire body


    . 2024 Apr 10:1-9.
    doi: 10.1123/jab.2023-0072. Online ahead of print.
    The Midfoot Joint Complex (Foot Arch) Contributes to the Upper Body Position in Bipedal Walking and Coordinates With the Lower Limb Joints

    Leonardo D Barsante 1, Paula M M Arantes 1, Daniela V Vaz 1, Fabricio A Magalhães 2, Diego S Carvalho 1, Aline C Cruz 1, Renan A Resende 1, Juliana M Ocarino 1, Sérgio T Fonseca 1, Thales R Souza 1
    Affiliations expand
    Abstract

    This study estimated the contribution of the midfoot joint complex (MJC) kinematics to the pelvis anterior-posterior positions during the stance phase of walking and investigated whether the MJC is functionally coordinated with the lower limb joints to maintain similar pelvic positions across steps. Hip, knee, ankle, and MJC sagittal angles were measured in 11 nondisabled participants during walking. The joints' contributions to pelvic positions were computed through equations derived from a link-segment model. Functional coordination across steps was identified when the MJC contribution to pelvic position varied and the summed contributions of other joints varied in the opposite direction (strong negative covariations [r ≤ -.7] in stance phase instants). We observed that the MJC plantarflexion (arch raising) during the midstance and late stance leads the pelvis backward, avoiding excessive forward displacement. The MJC was the second joint that contributed most to the pelvis positions (around 18% of all joints' contributions), after the ankle joint. The MJC and ankle were the joints that were most frequently coordinated with the other joints (≅70% of the stance phase duration). The findings suggest that the MJC is part of the kinematic chain that determines pelvis positions during walking and is functionally coordinated with the lower limb joints.
     
  9. scotfoot

    scotfoot Well-Known Member

    Presumably, when gait speeds up, so rapid arch recoil becomes more important, especially as sprinting speeds are approached.
    One question that occurs to me is; do all the tissues of the foot that contribute to arch recoil feed energy back into the foot at the same rates . Or, do stretched tendon/ muscle units return energy during shortening ( arch recoil) more quickly than the plantar ligaments and the plantar fascia?

    It would seem likely, so perhaps the muscle tendon units of the foot become more important than the PF and plantar ligament in timely arch recoil during sprinting .

    Are "pre- arched" feet (pes cavus), an advantage when it comes to push off during the short sprints? Probably!
     
    Last edited: May 29, 2024
  10. scotfoot

    scotfoot Well-Known Member

    Another paper highlighting the importance of arch recoil during gait . So 3 papers from two research groups in the last year or so. Looking on the internet ,this research has not yet gained much traction but that is not surprising given that it is so disruptive.

    Feet must have the ability to flex and the necessary foot power to overcome forces that tend to flatten the arches. Note, power, not just strength, and presumably the faster you run the greater the need for rapid arch recoil to keep the tibia and pelvis in "proper" alignment.


    Reassessing the Role of Foot Power in Human Gait

    Quinn Yetman, Lauren Welte, Aidan Shimizu, Michael J Rainbow



    Abstract

    "The foot acts as the primary interface to the ground during bipedal locomotion. It absorbs and returns energy over stance as the longitudinal arch deforms and recoils. The term ‘arch recoil’ evokes the concept that the foot’s returned energy directly propels the centre of mass forward by lifting the talus. However, recent work has shown that arch recoil does not directly drive the body forward; instead, it lowers and posteriorly tilts the talus, putting it into a more favourable position for upright gait. Here, we aim to supply a kinetic explanation for this mechanism. We applied the unified deformable power approach to highly accurate talus kinematics from biplanar videoradiography and force plate measurements to measure the power absorbed/produced by the foot. We coupled these measurements with a simple mathematical model that allowed us to restrict rotation and linear actuation of the talus caused by the recoil of the arch to demonstrate that positive foot power primarily contributes to posteriorly tilting the talus. This suggests the role of positive foot power during propulsion is to keep the talocrural surface in a more favourable position for upright gait rather than directly propelling the centre of mass forwards. These findings highlight that arch mobility during push-off is critical for allowing the ankle to directly propel the body forward and upward during the propulsive phase of gait."
     
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