Bioabsorbable internal fixation devices have become a focus of many researchers in the past 30 years because of their incomparable advantages to metal materials in orthopaedic operations.

由于生物可吸收内固定器材在骨科手术中具有金属材料所无法比拟的优势，故是近30年国内外学者研究的热门。

Poly-DL-lactide(PDLLA) is a kind of cheep, bioabsorbable polymer, whichhas good initial strength. When degrading, its micro-environment turns acidand its initial strength becomes weaker, which restrict its application.

外消旋聚丙交酯（PDLLA）是一种价廉的可吸收材料，并具有良好的初始机械强度，广泛应用于组织工程中，但PDLLA降解过程中造成的微环境过酸，不利于细胞的生长；并且随着分子量的降低，其机械性能也随之减弱，因而限制了其应用。