Influence of phase angle between axial and torsional loadings on fatigue fractures of bone

Distinct Hip and Rearfoot Kinematics in Female Runners With a History of Tibial Stress Fracture

“…10 These authors determined that physiological differences in the phase angle between torsional and axial loading can increase the fatigue damage to bone by a factor of 7. The phase angle is related to kinematics, thus differences in kinematics between runners will be reflected in the phase angle.…”

“…Subjects included in the stress fracture group reported a previous tibial stress fracture that was confirmed by a medical professional using diagnoscrease in resistance to fatigue fracture. 10 The phase angle reflects the temporal phasing of cyclical loading patterns, with smaller phase angles indicating more in-phase loading patterns. George and Vashishth 10 reported that smaller phase angles between axial and torsional loads were related to increased fatigue damage.…”

“…10 The phase angle reflects the temporal phasing of cyclical loading patterns, with smaller phase angles indicating more in-phase loading patterns. George and Vashishth 10 reported that smaller phase angles between axial and torsional loads were related to increased fatigue damage. Differences in kinematics during running, therefore, may increase fatigue damage to the tibia.…”

Analyse des propriétés biomécaniques de l'os à l'échelle macroscopique

“…Pour les essais sur os trabéculaire ou cortical, les échantillons sont découpés selon une forme connue. Ainsi, Jepsen et al [5] et George et Vashishth [6], à partir de diaphyses fémorales humaines et de tibias de bovins découpent leurs spécimens d'os cortical en cylindres.…”

Internal structural loading of the lower extremity during running: Implications for skeletal injury

“…Peak loads occurred during midstance and were associated with peak patella-femoral contact force and peak muscular force of the quadriceps and gastrocnemius. In addition, the largest torsional moment was observed at the distal femur, and in-phase combined torsion and axial loading has been shown to cause a sevenfold reduction in cortical bone fatigue life (George & Vashishth, 2005). Recently, the free moment, a vertically oriented torque experienced between the foot and ground, was found to be a strong predictor of subjects with a history of tibial stress fracture .…”