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- W1971294982 abstract "Background: A combined magnetic field (CMF) is a composite of a dynamic sinusoidal magnetic field and a magnetostatic field. Stimuli from CMFs has proved to be an effective tool for healing problem fractures and spinal fusion procedures. Hypothesis: Combined magnetic field technology will enhance healing of bone-tendon junction repair via endochondral ossification for regeneration of the fibrocartilage zone. Study Design: Controlled laboratory study. Methods: Forty-eight mature rabbits were randomly divided into CMF-treated and placebo-treated (control) groups. A partial patellectomy model was created. The CMF-treated group was subjected to CMF stimulation from the third postoperative day for 30 minutes per day up to weeks 8 or 16. At each time point, tissue samples were harvested and evaluated biomechanically and histomorphologically. The area of newly formed bone and the thickness of fibrocartilage were measured in hematoxylin and eosin–stained sections and toluidine blue–stained sections, respectively, while the density of fibrocartilage cells and the amount of proteoglycans were calculated using safranin O–stained sections. A biomechanical analysis was carried out to ascertain tensile strength. Results: Quantitative histological measurements showed that the newly formed bone and regenerated fibrocartilage zone in the CMF-treated group increased by a respective 99.2% and 41.9% compared with the control group at week 8 and a respective 97.8% and 22.8% at week 16. In the CMF-treated group at postoperative week 16, the amount of proteoglycans was 36.9% more than that of the control group, but the density of fibrocartilage cells was just 71.4% of the control group; there were no significant differences at week 8. Mechanical test results showed that energy to failure was not significantly different between the 2 groups at week 8. Yet, at week 16, load to failure, ultimate strength, and energy to failure in the CMF-treated group (311.0 ± 59.4 N, 8.46 ± 1.41 MPa, and 0.87 ± 0.17 J, respectively) were significantly higher than those in the control group (247.1 ± 65.6 N, 6.84 ± 1.12 MPa, and 0.52 ± 0.15 J, respectively). Conclusion: Biophysical stimulation with CMFs enhances healing after bone-tendon junction injuries in a rabbit model. Clinical Relevance: These results demonstrate the feasibility of using CMFs for stimulating bone-tendon healing after repair." @default.
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- W1971294982 date "2014-07-28" @default.
- W1971294982 modified "2023-10-17" @default.
- W1971294982 title "Enhanced Patella–Patellar Tendon Healing Using Combined Magnetic Fields in a Rabbit Model" @default.
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- W1971294982 doi "https://doi.org/10.1177/0363546514541539" @default.
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