Bojsen-Møller’s ‘high gear/low gear’

Wikis > Biomechanics > Clinical Biomechanics > Concepts > Bojsen-Møller's 'high gear/low gear'

http://www.runresearchjunkie.com/another-look-at-the-performance-claims-by-the-airia-one-running-shoe-a-theoretical-context/

http://www.podiatry-arena.com/podiatry-forum/showthread.php?t=2023

Based on Bosjen-Moller (1979)
• The oblique axis consists of metatarsal heads 2 to 5 – this axis has a shorter lever arm or radius to the posterior aspect of the calcaneus or achilles tendon.
• The transverse axis consists of metatarsal heads 1 and 2 – this axis has a longer lever arm or radius to the posterior aspect of the calcaneus or achilles tendon
• Least resistance is provided by the shorter lever arm ie the oblique axis – so this is used to begin unweighting the heel  ‘weight flow’ is initially directed to the lateral column as weight comes off the heel – the low gear
• As heel unweighting progresses, the foot must switch to the transverse axis for the foots autosupportive mechanisms to get established and for a more efficient propulsion and greater thrust (greater lever arm)  ‘weight flow’ is now directed to the first interspace – the high gear
• Function across the high gear transverse axis results in a tight plantar fascia and increased medial weight bearing – transfer to this axis is assisted by peroneus longus lifting the lateral side of the foot at heel unweighting

 
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