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In the study reported here, we determined the effects on bone healing of rofecoxib, one of the selective cyclooxygenase-2 (Cox-2) inhibitors that has been used for postsurgical analgesia, and compared these effects with those of nonselective ibuprofen and placebo. Each of 66 male rats received a closed, nondisplaced femoral fracture and was fed rofecoxib, ibuprofen, or placebo for 4 weeks. Results of postsacrifice evaluation showed gross nonunions in 64.7% of rofecoxib rats (P < .0001), 17.6% of ibuprofen rats (P = .007), and 0% of placebo rats. Compared with ibuprofen, rofecoxib was significantly more likely to produce nonunions (P = .007). Mean callus width was 8.9 mm (SD, 1.3 mm) for rofecoxib (P = .03), 8.9 mm (SD, 1.2 mm) for ibuprofen (P = .03), and 8.0 mm (SD, 1.3 mm) for placebo. Mean healing maturity (Goldberg classification) was 1.6 (SD, 0.7) for rofecoxib (P < .0001), 1.7 (SD, 0.8) for ibuprofen (P = .0001), and 2.7 (SD, 0.6) for placebo. Mean fracture angulation was 30.8 degrees (SD, 16.7 degrees) for rofecoxib (P = .003), 14.3 degrees (SD, 14.4 degrees) for ibuprofen (NS), and 13.4 degrees (SD, 10.3 degrees) for placebo. Mean histologic healing was 5.75 for rofecoxib (P = .02), 6.35 for ibuprofen (P = .05), and 8.25 for placebo. Cox-2 inhibitors should be used with caution when bone healing is necessary. Further study is warranted to determine whether the adverse effects occur in humans.
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Tissue Eng Part A
December 2024
Department of Orthopedics, Municipal Hospital Affiliated to Taizhou University, Taizhou City, China.
Senescence and osteogenic differentiation potential loss limited bone nonunion treatment effects of bone marrow-derived mesenchymal stem cells (BMSCs). MiR-100-5p/Lysine(K)-specific demethylase 6B (KDM6B) can inhibit osteogenesis, but their effects on bone union remain unclear. This study aims to investigate the effects of miR-100-5p/KDM6B on osteogenic differentiation and bone defects.
View Article and Find Full Text PDFConnect Tissue Res
December 2024
Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Tokyo, Japan.
Aim: We aimed to investigate whether α-ketoglutarate (AKG) can promote autophagic activity under a peri-implant condition to enhance the osseointegration of dental implant in rats with osteoporosis (OP).
Methods: Con, Model and AKG groups were established for the random allocation of thirty rats ( = 10). Their bone metabolism indicators were measured.
Heliyon
December 2024
Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, United Arab Emirates.
Oxygen is a fundamental requirement for cellular metabolism. Hypoxia is a state of oxygen deprivation of the tissues. Cells develop numerous adaptive mechanisms to survive hypoxic insult.
View Article and Find Full Text PDFCureus
December 2024
Trauma and Orthopaedics, Royal Surrey NHS Foundation Trust, Guildford, GBR.
Bone healing is a complex, dynamic process involving a series of well-coordinated stages, influenced by both mechanical and biological factors. The skeletal system, composed of inorganic (36%), organic (36%), and water (28%) components by volume, plays a crucial role in maintaining structural integrity and mineral homeostasis. Bone is classified into two main types based on microstructure: lamellar and woven bone, with lamellar bone being stronger and more durable.
View Article and Find Full Text PDFBioact Mater
March 2025
Department of Orthopedics and Rehabilitation, USA.
Osteoarthritis (OA) is a condition that affects the quality of life of millions of patients worldwide. Current clinical treatments, in most cases, lead to cartilage repair with deposition of fibrocartilage tissue, which is mechanically inferior and not as durable as hyaline cartilage tissue. We designed an mRNA delivery strategy to enhance the natural healing potential of autologous bone marrow aspirate concentrate (BMAC) for articular cartilage repair.
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