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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
Published on: April 11, 2018
Increased non-linear locomotion alters diaphyseal bone shape
Kristian J Carlson1, Stefan Judex
1Department of Anatomy, New York College of Osteopathic Medicine, Northern Boulevard, Old Westbury, NY 11568-8000, USA. kcarlson@nyit.edu
The Journal of Experimental Biology
|August 21, 2007
Summary
Increased turning activity in mice, without added exercise, significantly altered femoral shape. This suggests specific locomotor modes, not just activity levels, influence bone structure and mass distribution in the femur.
Area of Science:
- Biomechanics
- Comparative Morphology
- Bone Biology
Background:
- Understanding bone adaptation to physical activity is crucial for biomechanics and evolutionary studies.
- Previous research often confounds increased activity with specific locomotor changes.
- Genetic variability can obscure the direct effects of activity on bone structure.
Purpose of the Study:
- To test if increased turning locomotion, independent of exercise, alters femoral cross-sectional shape.
- To differentiate the effects of qualitative locomotor changes from quantitative activity increases on bone morphology.
- To investigate the relationship between specific movement patterns and bone structural properties.
Main Methods:
- Thirty-day-old female mice (n=10/group) were housed for 8 weeks in cages promoting linear, turning, or standard locomotion.
- Body mass, femoral length, and midshaft cortical area were measured.
- Mediolateral (ML) and anteroposterior (AP) bending rigidity and their ratio were analyzed.
Main Results:
- No significant differences were found in body mass, femoral length, or cortical area across groups.
- Physical activity levels were equivalent between groups.
- The ratio of ML to AP diaphyseal rigidity, indicating cross-sectional shape, was significantly higher in turning mice.
Conclusions:
- Qualitative differences in locomotor patterns, specifically increased turning, alter femoral diaphyseal shape.
- Bone mass distribution in the femur is influenced by specific modes of locomotion.
- Turning behavior should be considered when studying form-function relationships in vertebrate limb bones.
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