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AKThe tibia is the second largest bone in the body situated on
the medial side in the leg. The tibia is the pre-axial bone and
homologous with the lateral bone of the forearm, the radius.
It transmits weight of the body from femur to the foot.
PARTS
The tibia is a long bone and consists of three parts: upper
end, lower end, and intervening shaft.
The upper end is expanded and bears prominent medial
and lateral condyles and tibial tuberosity. The medial condyle
is larger than the lateral condyle. The two condyles articulate
with the condyle of the femur.
The shaft has three borders—anterior, medial, and lateral;
and three surfaces—medial, lateral, and posterior. The
anterior border is the sharpest and takes a sinuous course
from the tibial tuberosity and becomes continuous below
with the anterior border of the medial malleolus.
The lower end is small and projects medially and inferiorly
as medial malleolus.
ANATOMICAL POSITION AND SIDE DETERMINATION
The side of tibia is determined by holding the bone vertically
in such a way that:
1. Its expanded end with condyles faces upward.
2. Its tibial tuberosity and sharp sinuous anterior border of
the shaft faces anteriorly.
3. Medial malleolus is on the medial side.
4. Superior surface of the upper end (tibial plateau) lies in
a horizontal plane.
@akramanatomy
