Factors that determine kinematic coupling behavior of calcaneal pronation/supination and shank rotation during weight bearing: ananalysis based on foot bone alignment using radiographic images.
Masahiro Edo, Sumiko Yamamoto, Toshikazu Yonezawa
PMID 30349152WHAT IT FOUND
In healthy adults standing, how much the lower leg rotated as the heel moved was associated with foot bone alignment on X-rays.
Several foot alignment angles tracked this link. It does not show that changing the arch changes movement.
Key findings
01The mean coupling ratio was 0.96 ± 0.20, with a maximum of 1.58 and a minimum of 0.64.
02Fifteen foot alignment parameters measured from standing X-rays were significantly correlated with the coupling ratio.
03Every alignment parameter correlated with the coupling ratio also differed between men and women, with more positive correlations in men and more negative correlations in women.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Only 15 healthy adults were studied, so findings may not apply to patients with foot, ankle, or knee problems. The study measured people at one time and used correlations, so it cannot show that foot alignment causes the movement pattern. No intervention was tested, so it does not show that foot orthoses, arch supports, or exercises change the coupling ratio. The researchers analysed left and right legs independently, although both legs came from the same 15 people. The sample had nine men and six women, so sex differences are based on small groups.
Declared interests
The authors declared no conflict of interest.
The easy way to misread this
Do not read this as proof that foot alignment causes the movement pattern or that changing the arch will change lower limb movement. The study measured healthy adults at one time, so it only shows an association.