FIBULA & BONES OF FOOT
LEARNING OBJECTIVES
By the end of today’s class every student should be able to;
 know the side determination of the bone.
 Understand the bony features along with its different attachments
on the fibula.
 Study about tarsal bones and their arrangment.
 Know about metatarsal bones and phalangeal bones.
FIBULA





Lateral bone of leg.
The most slender of all the long bones.
Upper extremity is small placed toward back of head of tibia below kneejoint.
Excluded from formation of knee joint.
Lower extremity projects below tibia, forms lateral part of ankle-joint.
SIDE DETERMINATION


Upper end or head is slightly expanded in all directions, where as its lower end
is expanded anteroposteriorly & flattened from side to side.
Medial aspect of lower end triangular aricular facet anteriorly , and deep
malleolar fossa posteriorly.
Upper end or Head




Head slightly expanded in all direction.
Sup surface bears articular facet for lat condyle of tibia.
Posterolateral Upward projection is called styloid process.
Constriction just below to head is called fibular neck.
SHAFT



It is moulded by muscular attachment; therefore fibular shaft is of considerable
variations.
It has three borders ; ant, post, interosseous border.
Three surfaces med, lat , post.
Anterior border

It starts just below to ant aspect of head and ends at lateral surface of lateral
malleolus. Before it ends it is divided to enclose elongated triangular area.
Posterior border


It is rounded ; upper end lies in line with the styloid process .
Below it is continous with the medial margin of the groove on the
back of lateral malleolus .
Medial border




Also called inerosseous border.
Lies just medial to ant border but more on posterior plane.
It ends at lateral malleolus.
Its upper 2/3rd portion is very close to anterior border.
Surfaces of the Shaft



Medial surface lies b/w anterior and medial/interosseous border.Its upper 2/3rd
is very narrow.
Lateral surface lies b/w anterior and posterior border. it is twisted backwards in
its lower part.
Posterior surface lies b/w interosseous and posterior border. This largest
surface among all three surfaces is divided into two parts by vertical ridge in its
upper 2/3rd portion , called medial crest.
Lower end or Lateral Malleolus





Pyramidal shape,flattened from side to side; descends to a lower level than
medial malleolus.
Medial surface has smooth triangular surface to articulate with talus. Behind
and beneath the articular surface is a rough depression, for posterior
talofibular ligament.
The lateral surface is convex, subcutaneous.
The anterior border is thick and rough, and marked below by a depression for
the attachment of the anterior talofibular ligament.
The posterior border is broad and presents the shallow malleolar sulcus, for
the passage of the tendons of the peroneous longus and brevis.
Attachments of the fibula




Medial surface:
Extensor digitorum longus.
Extensor hallucis longus.
Peroneus tertius.















Posterior surface.:
Tibialis post.
S ol i us .
Flexor hallucis longus.
Lat surface.:
Peroneus longus.
Peroneus brevis.
HEAD of FIBULA
Biceps femoris.
Fibular collateral ligament.
Anterior border;
Ant intermuscular septum.
Sup extensor retinaculum.
Sup peroneal retinaculum
Posterior border;
Post intermuscular septum

Interosseous border:

Interosseous membrane.

Groove on the post surface of lat maleolus gives passage
to the peroneus brevis & longus.
BONES OF FOOT
INTRODUCTION






26 bones (One-quarter of the bones in the human body are
in the feet.);
3 3 j o i n ts ;
more than 100 muscles, tendons (fibrous tissues that
connect muscles to bones), and ligaments (fibrous tissues
that connect bones to other bones); and
a network of blood vessels, nerves, skin, and soft tissue.
These components work together to provide the body with
support, balance, and mobility.
Parts of the Foot
Structurally, the foot has three main parts: the forefoot, the
m i d fo o t, a n d th e h i n d fo o t.
TALUS

The talus is the second largest of the tarsal bones. It
occupies the middle and upper part of the tarsus,
supporting the tibia above, resting upon the calcaneus
below, articulating on either side with the malleoli, and in
front with the navicular. It consists of a body a neck and a
head .
CALCANEUM OR CALCANEUS


The calcaneus is the largest of the tarsal bones. It is
situated at the lower and back part of the foot, serving to
transmit the weight of the body to the ground, and forming
a strong lever for the muscles of the calf.
It is roughly cuboidal in shape, having 6 surfaces.
NAVICULAR BONE

This boat shaped, navicular bone is situated at the medial side of
the tarsus, between the talus behind and the cuneiform bones in
front.
CUBOID BONE


The cuboid bone is placed on the lateral side of the foot, in
front of the calcaneus, and behind the fourth and fifth
metatarsal bones. It is of a cuboid shape, its base being
directed medialward .
It has 6 surfaces.
CUNEIFORMS BONES




There are three cuneiforms bones , medial (1st),
intermediate (2nd) , lateral (3rd) cuneiforms bone.
1st is the largest & 2nd is the smallest one.
Each bone is attached posteriorly to navicular bone and
anteriorly to the base of metatarsal bone of its own
number.
Lateral cuneiforms also articulate with cuboid bone.
THANK YOU