Table 2.

Summary of mechanical properties in cortical locations of equine third metacarpals

Test modeCortical regionNElastic modulus (GPa)Yield stress (MPa)Yield strain (%)Ultimate stress (MPa)Ultimate strain (%)Physiological stress (MPa)Yield safety factorUltimate safety factor
TensionCranio-lateral (T)1217.81±1.86148.59±15.451.00±0.07161.20±17.733.38±0.793.95±0.3237.72±3.4940.93±4.18
Caudo-medial (C)1717.26±2.21148.07±2.211.02±0.15163.85±17.023.73±0.8437.13±4.844.04±0.624.46±0.59
CompressionCranio-lateral (T)2011.88±3.04172.04±20.791.76±0.50182.87±16.542.89±2.502.65±0.6768.89±20.0973.86±23.35
Caudo-medial (C)2012.98±2.56157.71±23.251.45±0.15170.28±15.132.11±0.4928.00±5.395.71±0.706.23±0.89
Lateral (C) (C,T?)*1013.92±4.56158.57±40.011.39±0.20174.38±17.891.93±0.8611.36±3.7214.39±2.6117.39±8.22
Cranio-medial (C)1014.30±2.76185.68±23.851.53±0.14191.54±21.722.00±0.573.46±0.6754.45±5.9856.45±7.91
  • Values are means ± S.D.; N=number of specimens.

    T, specimen obtained from a bone region subject to habitually prevalent tensile strains.

    C, specimen obtained from a bone region subject to habitually prevalent compressive strains.

  • * This region may receive predominant tension at higher gait speeds.