Stress shielding refers to the reduction in
bone density (
osteopenia) as a result of removal of normal stress from the bone by an implant (for instance, the femoral component of a
hip prosthesis). This is because by
Wolff's law, bone in a healthy person or animal will remodel in response to the loads it is placed under. Therefore, if the loading on a bone decreases, the bone will become less dense and weaker because there is no stimulus for continued remodeling that is required to maintain bone mass.