Stress fractures in the calcaneus can occur from heavy heel impact in individuals with rigid feet or poor mobility, while the navicular bone can sustain tensile strain fractures due to pronation and rotation.

“so for example if you have patients that are hitting their heel very hot and heavy right so they might have a rigid foot they might have one that doesn't have good mobility and they hit the heel heavy they can get a stress fracture in the calcinus the fifth metatarsal also very common location for these compressive loading stress fractures because they're they can't handle that compression but on the other side of the foot remember we talked about the navicular that guy technically should never hit the ground but he can get a stress fracture so you're saying to yourself well how is that possible if they're caused by compressive loading not that guy he's caused by tensile strain when you can't handle the foot pronating and rotating and you can't handle the movement of the foot the tendon will start to tug and you'll start to”