In vivo bone strain on the dog tibia during locomotion

Area of Science:

• Biomechanics
• Orthopedics
• Comparative Physiology

Background:

• Understanding bone loading during locomotion is crucial for biomechanical analysis.
• Previous studies have characterized bone strain in various species, highlighting interspecies differences.

Purpose of the Study:

• To investigate and characterize the in vivo bone strain patterns in the canine tibia during treadmill locomotion.
• To compare canine bone strain patterns with those previously reported in sheep and humans.

Main Methods:

• Implantation of rosette and single-element strain gauges on the tibia of two dogs.
• Recording of bone strains during treadmill locomotion, analyzing different phases (swing, stance).

Main Results:

• Low bone strains and variable principal strain directions were observed during foot contact and swing phase.
• A significant shift in principal strain direction and increased bone strain magnitude occurred at the onset of the stance phase.
• Peak bone strain, primarily tensile, was measured midway through the stance phase, oriented anterosuperiorly (30-60 degrees) relative to the tibial long axis.

Conclusions:

• Canine tibial bone strain patterns during locomotion exhibit distinct characteristics, particularly during the stance phase.
• The observed strain patterns in dogs share similarities with sheep but markedly differ from human locomotion-induced bone strains.