Fibula: The Forgotten Bone-May It Provide Some Insight On a Wider Scope for Bone Mechanostat Control?

Area of Science:

• Biomechanics and human skeletal adaptation.

Background:

• The fibula's response to mechanical stimuli differs from the tibia.
• Bone structure is influenced by physical activity and foot usage patterns.

Purpose of the Study:

• To investigate how different types of physical activity affect fibula strength and structure.
• To explore the selective pressures on fibula adaptation related to locomotion and energy storage.

Main Methods:

• Comparative analysis of fibula structure and strength in athletes (soccer players, long-distance runners) versus untrained individuals.
• Assessment of lateral bending strength and structural integrity in the fibula, particularly at the peroneus muscle insertion.

Main Results:

• Fibula strength against lateral bending varies with foot usage: stronger in soccer players, weaker in long-distance runners compared to controls.
• Fibula structure remains unaffected by disuse, indicating specific adaptations rather than general atrophy.
• Observed adaptations in human fibulae parallel those in quadrupedal animals for managing terrain and jumping.

Conclusions:

• Fibula adaptations are highly selective, suggesting the bone mechanostat regulates properties beyond mere structural strength.
• These findings highlight the role of specific mechanical demands, like those in sports, in shaping bone morphology and function.
• The fibula's adaptation may be influenced by evolutionary pressures related to locomotion and energy efficiency.