Elastic Modulus Closely Matched to Bone (Stress-Shielding Effect)

This is the most important physiological advantage of biodegradable plastic.

Metal Bone Screws: Their elastic modulus is far higher than that of human bone. This causes stress shielding, in which the metal bears most of the load and the surrounding bone loses mass because it receives insufficient mechanical stimulation.

Biodegradable Plastic Bone Screws: Their elastic modulus is very close to that of human cortical bone.

Benefit: Stress is transferred evenly to the surrounding bone tissue, promoting bone growth and healing while reducing the risk of postoperative bone loss.