Textbook Question
The arch(es) of the foot are the:
a. Transverse arch
b. Medial longitudinal arch
c. Lateral longitudinal arch
d. Both a and b are correct
e. All of the above are correct
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7. The Skeletal System
Bone of the Lower Limb
3:25 minutesProblem 22
Textbook Question
Why is the tibia, but not the fibula, involved in the transfer of weight to the ankle and foot?
Verified step by step guidance1
The tibia is the larger and stronger of the two bones in the lower leg, while the fibula is thinner and primarily serves as a site for muscle attachment rather than weight-bearing.
The tibia is directly connected to the femur at the knee joint, forming a strong articulation that allows it to bear and transfer the weight of the body from the thigh to the lower leg.
At the distal end, the tibia forms the primary connection with the talus bone of the ankle, which is responsible for transferring weight to the foot. This structural alignment ensures efficient weight distribution.
The fibula, on the other hand, does not articulate with the femur and plays a minimal role in weight-bearing. Its primary function is to provide lateral stability to the ankle and serve as an attachment point for muscles and ligaments.
In summary, the tibia's size, strength, and direct articulations with the femur and talus make it the primary bone for weight transfer, while the fibula supports stability and muscle attachment.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Anatomy of the Lower Leg
The lower leg consists of two main bones: the tibia and the fibula. The tibia, or shinbone, is the larger and stronger of the two, designed to bear weight. In contrast, the fibula is thinner and primarily serves as a support structure, providing stability to the ankle rather than directly participating in weight transfer.
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Bone of the Lower Limb Example 1
Weight Bearing and Load Distribution
Weight bearing refers to the ability of a bone to support the weight of the body during activities such as standing and walking. The tibia is aligned with the body's center of gravity, allowing it to effectively transfer weight from the femur to the ankle and foot. The fibula, while important for stability, does not bear significant weight, as it is positioned laterally and does not connect directly to the knee joint.
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Ankle Joint Mechanics
The ankle joint is formed by the tibia and fibula, but it is the tibia that articulates directly with the talus bone of the foot. This connection allows the tibia to play a crucial role in transferring forces during movement. The fibula, while contributing to the ankle's lateral stability, does not participate in the primary load transfer, which is essential for effective locomotion.
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