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Jan-paul Van Wingerden
01-15-2001, 08:53 PM
Dear readers,

I'd like to add something to this discussion.

In function of the fibula we mostly look at its bony connections (see
other responses) However, the muscular attachments on the fibula give
some interesting information. On the proximal side of the fibula the
long head of the biceps femoris is attached. It seemes strainge that
such big strong muscle attaches to such small, relatively loose bone.
However, the soleus and peroneii also attach on the bone. Now the
following mechanism can occur:
At heelstrike, during walking, the tibialis anterior induces dorsal
flexion of the ankle joint. As result of this dorsal flexion, the soleus
and peroneii are lengthened. In this action they pull the fibula down
(in force, not so much in motion) Therefore they stabilize the fibula so
it becomes a firm attachment for the long head of the biceps femoris. It
is assumed that you need tension of the biceps to stabilize not only the
knee, but the sacro-iliac joints as well (literature of Vleeming
(spine)and Wingerden (european spine journal).

What seems to take place is a sling of forces from the pelvis down to
the ankle/foot where the fibula plays an important role in force
transfer.
Hope this adds to the discussion.

With kind regards,

Jan-Paul van Wingerden

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