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Imagine with every step and every bend of the knee, you experience aching pain and as time passes, this pain only worsens. This pain is caused by Osteoarthritis. Osteoarthritis is the breakdown of articular cartilage, a tissue with unique mechanical properties between your bones to keep them from rubbing together. To prevent Osteoarthritis after certain articular cartilage injuries, a surgical procedure called Autologous Chondrocyte Implantation (ACI) may be performed. ACI works by growing healthy cartilage cells within a stiff flask in the lab to increase the number of cells and subsequently reimplant the cells in the targeted joint. However, ACI is imperfect, and healing is limited. This limited capacity for repair stems from growing cells in an artificial culture environment prior to implantation. We discuss how our research aims to address this issue by developing more effective methods to stimulate cartilage cells to produce better tissues outside the body.
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http://dx.doi.org/10.3389/frym.2023.953816 | DOI Listing |
J Vis Exp
August 2025
Laboratory of Regenerative Medicine in Sports Science, School of Physical Education and Sports Science, South China Normal University; Bone and Joint Research Team of Degeneration and Injury, Guangdong Provincial Academy of Chinese Medical Sciences;
Post-traumatic osteoarthritis (PTOA) is a degenerative joint disease triggered by trauma or intense mechanical stress, leading to joint cartilage degeneration and functional impairment. Prostaglandin E2 (PGE2) contributes significantly to cartilage degradation following mechanical injury by activating its receptor, Prostaglandin E receptor 4 (EP4), on chondrocyte membranes. The homeostasis of articular cartilage primarily relies on the dynamic balance between cartilage degradation and repair, a process finely regulated by chondrocytes.
View Article and Find Full Text PDFJ Extracell Vesicles
September 2025
Division of Sports Medicine and Adult Reconstructive Surgery, Department of Orthopedic Surgery, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing, Jiangsu, China.
Osteoarthritis (OA), the prevalent debilitating joint disorder, is accelerated by dysregulated intercellular crosstalk, yet the role of fibroblast-like synoviocyte (FLS)-derived extracellular vesicles and particles (EVPs) in disease progression remains to be elucidated. Here, integrative analysis of clinical specimens, animal models, and publicly available datasets revealed significant alterations in exosomal pathways within OA synovium. Proteomic profiling revealed distinct molecular signatures in EVPs derived from inflammatory and senescent FLSs, reflecting the pathophysiological status of their parent cells.
View Article and Find Full Text PDFJ Exp Orthop
July 2025
Department of Orthopedic Surgery, Institute for Locomotion Aix-Marseille University Marseille France.
Purpose: The posterior tibial slope (PTS) plays a key role in knee biomechanics and may influence the risk of anterior cruciate ligament (ACL) rupture as well as the outcomes of its reconstruction. We hypothesised that a steeper medial posterior tibial slope (MPTS) would be associated with an increased risk of bilateral ACL reconstruction compared to unilateral reconstruction. This study aimed to test this hypothesis by comparing the MPTS between patients undergoing unilateral ACL reconstruction (uniACLR) and those requiring non-simultaneous bilateral ACL reconstruction (biACLR), using radiographic imaging.
View Article and Find Full Text PDFCase Rep Orthop
August 2025
Department of Orthopaedic Surgery, Nishinomiya Kaisei Hospital, Nishinomiya, Hyogo, Japan.
In recent decades, arthroscopic meniscal repair has been increasingly indicated for meniscal tears in the last decades. Although literature generally reports favorable surgical outcomes, it remains unclear whether the repaired meniscus maintains its function over the long term while performing its chondroprotective function without recurrent tear after clinical healing. A 43-year-old Japanese man who underwent meniscal repair for a bucket handle tear of the medial meniscus (MM) at the age of 15 years presented with right knee pain and catching symptoms without a preceding traumatic event.
View Article and Find Full Text PDFFront Oncol
August 2025
Department of Orthopaedics, Ruijin Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China.
Objective: To comprehensively examine the incidence and mortality of malignant neoplasms of bone and articular cartilage (MNBAC) in China compared with the world, as well as its age-specific patterns and sex disparities.
Methods: The MNBAC burden in China and the world was systematically assessed from 1990 to 2021 based on the Global Burden of Disease 2021, including incidence and mortality data. The estimated annual percentage change was calculated.