Biodegradable ZnLiCa ternary alloys for critical-sized bone defect regeneration at load-bearing sites: <i>In vitro</i> and <i>in vivo</i> studies.
basic_science · Level V
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- Record sourced from PubMed, PMID 33997489.
- Also identified by DOI 10.1016/j.bioactmat.2021.03.045 and PMC identifier 8085902.
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Abstract
A novel biodegradable metal system, ZnLiCa ternary alloys, were systematically investigated both <i>in vitro</i> and <i>in vivo</i>. The ultimate tensile strength (UTS) of Zn0.8Li0.1Ca alloy reached 567.60 ± 9.56 MPa, which is comparable to pure Ti, one of the most common material used in orthopedics. The elongation of Zn0.8Li0.1Ca is 27.82 ± 18.35%, which is the highest among the ZnLiCa alloys. The <i>in vitro</i> degradation rate of Zn0.8Li0.1Ca alloy in simulated body fluid (SBF) showed significant acceleration than that of pure Zn. CCK-8 tests and hemocompatibility tests manifested that ZnLiCa alloys exhibit good biocompatibility. Real-time PCR showed that Zn0.8Li0.1Ca alloy successfully stimulated the expressions of osteogenesis-related <i>genes</i> (ALP, COL-1, OCN and Runx-2), especially the OCN. An <i>in vivo</i> implantation was conducted in the radius of New Zealand rabbits for 24 weeks, aiming to treat the bone defects. The Micro-CT and histological evaluations proved that the regeneration of bone defect was faster within the Zn0.8Li0.1Ca alloy scaffold than the pure Ti scaffold. Zn0.8Li0.1Ca alloy showed great potential to be applied in orthopedics, especially in the load-bearing sites.