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Study of Bio-absorbability and Bio-compatibility of Poly-L-lactic-acid Implant in Dogs  

Park, Po-Young (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University)
Kim, Young-Ki (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University)
Bahk, Jong-Yoon (Department of Urology, Gyeongsang Nationai University Medical School)
Park, Joung-Man (School of Materials Science & Engineering, Gyeongsang National University)
Koh, Phil-Ok (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University)
Chang, Hong-Hee (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University)
Lee, Hee-Chun (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University)
Lee, Hyo-Jong (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University)
Yeon, Seong-Chan (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University)
Publication Information
Journal of Veterinary Clinics / v.24, no.2, 2007 , pp. 182-191 More about this Journal
Abstract
Bioabsorbable devices have been utilized and experimented in many aspects of orthopaedic surgery. Depending upon their constituent polymers, these materials can be tailored to provide sufficient rigidity to allow bone healing, retain mechanical strength for certain period of time, and then eventually begin to undergo degradation. The objective of this study was to estimate extent in which Poly-L-latic acid (PLLA) implants had bioabsorbability and biocompatibility with bone and soft tissue in dogs and also to develop bioabsorbable, biocompatible materials with the appropriate strength and degradation characteristics to allow for regular clinical use for treating orthopedic problems in humans as well as animals. Eighteen dogs were used as experimental animals and were inserted two types of PLLA implants. PLLA rods were inserted into subcutaneous tissue of back or the abdomen wall. And the rods were tested for material properties including viscosity, molecular weight, melting point, melting temperature, crystallinity, flexural strength, and flexural modulus over time. PLLA screws were inserted through cortical bone into bone marrow in the femur of the dogs and stainless steel screw was inserted in the same femur. Radiographs were taken after surgery to observe locations of screw. Histological variations including cortical bone response, muscular response, bone marrow response were analyzed over the time for 62weeks. The physical properties of PLLA rods had delicate balances between mechanical, thermal and viscoelastic factors. PLLA screws did not induce any harmful effects and clinical complications on bone and soft tissue for degradation period. These results suggest that PLLA implants could be suitable for clinical use.
Keywords
PLLA implant; bio-absorbility; bio-compatibility;
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