alexa Effects of sodium-hyaluronate and glucosamine-chondroitin sulfate on remodeling stage of tenotomized superficial digital flexor tendon in rabbits: a clinical, histopathological, ultrastructural, and biomechanical study.

Author(s): Oryan A, Moshiri A, Meimandiparizi AH

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Abstract This study was designed to evaluate the effects of sodium-hyaluronate (NaH) combined with glucosamine HCl-chondroitin sulfate (GlcN-CS) on the post-surgical repair of tendon rupture on day 84 post injury. Twenty white New Zealand female rabbits were divided randomly into two equal groups of injured treated and injured untreated. After tenotomy and surgical repair, using the modified Kessler technique and running pattern, the injured legs were casted for 14 days. NaH was injected subcutaneously over the lesion on days 3, 7, and 10 and was followed by daily oral administration of GlcN-CS on days 3 to 23 post injury. The control animals received normal saline injection and oral placebo similarly. The weight of the animals, tendon diameter, clinical manifestations, and radiographic and ultrasonographic evaluations were conducted for 12 weeks. The rabbits were euthanized 84 days post injury and the tendons were evaluated at macroscopic, histopathologic, and ultrastructural level and were assessed for biomechanical and percentage dry-weight parameters. Treatment significantly reduced the tendon diameter and ultimate and yield strain, and increased the echogenicity, dry-weight content, ultimate and yield strength, and stress and stiffness of the injured tendons compared to those of the untreated ones. Treatment also significantly enhanced the maturation rate of the tenoblasts, fibrillogenesis, the diameters of the collagen fibrils, and fibrillar density. These findings suggest that a combined treatment of NaH and GlcN-CS could be effective in restoring the morphological and biomechanical properties of injured superficial digital flexor tendon of rabbits and might be helpful for future clinical trial studies in tendon ruptures. This article was published in Connect Tissue Res and referenced in

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