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Substance P (SP) is a neuropeptide that is released from sensory nerve endings and is widely present in nerve fibers. It acts on bones and related tissues by binding to receptors, thereby regulating bone metabolism, cartilage metabolism, and fracture healing. SP has attracted widespread attention as a signaling substance that can be recognized by both the immune system and the nervous system. Previous studies have shown that bone and chondrocytes can synthesize and secrete sensory neuropeptides and express their receptors, and can promote proliferation, differentiation, apoptosis, matrix synthesis, and the degradation of target cells through autocrine/paracrine modes. In this paper, we review the research progress made in this field in recent years in order to provide a reference for further understanding the regulatory mechanism of bone and cartilage physiology and pathological metabolism.
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http://dx.doi.org/10.3389/fendo.2020.00077 | 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 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.
Osteoarthr Cartil Open
December 2025
Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region of China.
Objective: We developed and validated an artificial intelligence pipeline that leverages diffusion models to enhance prognostic assessment of knee osteoarthritis (OA) by analyzing longitudinal changes in patella shape on lateral knee radiographs.
Method: In this retrospective study of 2,913 participants from the Multicenter Osteoarthritis Study, left-knee weight-bearing lateral radiographs obtained at baseline and 60 months were analyzed. Our pipeline commences with an automatic segmentation for patella shapes, followed by a diffusion model to predict patella shape trajectories over 60 months.
Cureus
August 2025
Orthopedics, All India Institute of Medical Sciences, Jodhpur, Jodhpur, IND.
Giant cell tumor (GCT) of the bone, although benign, demonstrates local aggressiveness, a potential for recurrence, and, in rare instances, malignant transformation. Functional preservation is crucial in cases involving the articular surface, often utilizing the Sandwich Technique. We propose an enhanced reconstruction method using the inner table of the iliac crest in a reverse fashion, offering a more anatomically contoured proximal tibial plateau and reducing donor site morbidity compared to tricortical iliac crest grafting.
View Article and Find Full Text PDFJBJS Essent Surg Tech
September 2025
Division of Hand and Reconstructive Microsurgery, Department of Orthopedics, Olympia Hospital & Research Centre, Trichy, Tamilnadu, India.
Background: Hemi-hamate osteochondral grafting is a surgical technique that is utilized to reconstruct the proximal interphalangeal (PIP) joint in cases of unstable dorsal fracture-dislocation with >50% articular surface involvement. However, hemi-hamate osteochondral grafting can be technically challenging, has been reported to have various technical modifications, and can lead to complications such as overstuffing of the joint. This surgical technique article describes successful PIP joint reconstruction with use of a hemi-capitate osteochondral graft, which may offer a viable alternative to hemi-hamate osteochondral graft.
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