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Comparative bone healing near eroding polylactide-polyglycolide implants of differing crystallinity in rabbit tibial
1J. Vernon Luck Sr. Orthopaedic Research Center, Orthopaedic Hospital, Los Angeles, CA 90007, USA.
Journal of Biomaterials Science. Polymer Edition
|January 1, 1997
Summary
The study compared two types of biodegradable polymers, poly(DL-lactide-co-glycolide) (PDLLG) and poly(L-lactide-co-glycolide) (PLLG), in bone healing. Faster eroding PDLLG altered bone healing more than PLLG.
Area of Science:
- Biomaterials Science
- Orthopedic Research
- Tissue Engineering
Background:
- Biodegradable polymers are used in bone regeneration.
- Understanding polymer erosion is crucial for optimizing healing.
- Poly(DL-lactide-co-glycolide) (PDLLG) and poly(L-lactide-co-glycolide) (PLLG) are common biomaterials.
Purpose of the Study:
- To compare the in vivo erosion and bone healing response to PDLLG and PLLG implants.
- To investigate the effect of polymer degradation rates on angiogenesis and osteogenesis.
Main Methods:
- Chronic in vivo observation of PDLLG washers and PLLG threads in rabbit tibial implants using intravital microscopy.
- Quantification of polymer erosion, angiogenesis, and osteogenesis by measuring projected areas.
Main Results:
- Significant differences in erosion rates were observed between PDLLG and PLLG.
- Both polymers influenced bone healing differently compared to controls.
- Faster eroding PDLLG led to greater deviations in osteogenesis and angiogenesis than PLLG.
Conclusions:
- Polymer erosion rate significantly impacts the bone healing response.
- Faster polymer degradation may alter macrophage-endothelial cell interactions, affecting angiogenesis and osteogenesis.
- PLLG demonstrates a potentially more favorable healing profile than PDLLG due to its slower erosion.