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Fig. 6.31 Above the lateral arch bones is the
fibula, which is clearly not positioned to
transfer weight down. On the contrary, its
position, tucked under the condyle of the tibia,
suggests that it is designed instead to resist
upward pull. (Reproduced with kind
permission from Grundy 1982.)
Fig. 6.29 The foot
parses fairly neatly
into the bones of the
medial arch and
those of the lateral
arch. Some dancers
call this the 'toe foot'
and the 'heel foot'
respectively.
Fig. 6.30 In terms of function,
the medial arch bones can be
seen to be the major weight-
bearing 'canoe', while the
outer arch bones act like an
'outrigger', balancing and
stabilizing but not bearing so
much weight.
If we trace this entire linkage, we can link the 'heel foot' - in
other words, the lateral arch - to the sacroiliac joint via the
peroneals, the biceps femoris, and the sacrotuberous ligament
(see Fig. 6.20). The success and holding power of the sacro-
iliac joint manipulations of our chiropractic and osteopathic
colleagues can be markedly increased, in our clinical experi-
ence, through creating more soft-tissue balance of the 'heel
foot', fibularii, head of the fibula, and lateral hamstring. In other
words, heel position and the lateral arch relate to sacroiliac
joint stability via the lower posterior SPL.
Looking above the 'heel foot', we find the fibula, uniquely
placed in being tucked under the tibial condyle (Fig. 6.31). It
is very badly positioned to bear weight, and in fact looks better
placed to resist being pulled up, rather than pulled down.
Although eight muscles pull down on the fibula from the foot,
one very large one, the biceps femoris, pulls directly up and
in on it.
Reference
1. Clemente C. Anatomy, a regional atlas of the human body.
3rd edn. Philadelphia: Lea and Febiger; 1987: Fig. 506.
146
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