Humans ; Sarcoma/pathology* ; Bone and Bones/pathology* ; Soft Tissue Neoplasms/pathology* ; Bone Neoplasms/pathology*

Cellular immune responses as well as generalized and periarticular bone loss are the key pathogenic features of rheumatoid arthritis (RA). Under the pathological conditions of RA, dysregulated inflammation and immune processes tightly interact with skeletal system, resulting in pathological bone damage via inhibition of bone formation or induction of bone resorption. Single-cell omics technologies are revolutionary tools in the field of modern biological research.They enable the display of the state and function of cells in various environments from a single-cell resolution, thus making it conducive to identify the dysregulated molecular mechanisms of bone destruction in RA as well as the discovery of potential therapeutic targets and biomarkers. Here, we summarize the latest findings of single-cell omics technologies in osteoimmunology research in RA. These results suggest that single-cell omics have made significant contributions to transcriptomics and dynamics of specific cells involved in bone remodeling, providing a new direction for our understanding of cellular heterogeneity in the study of osteoimmunology in RA.
Humans ; Osteoclasts/physiology* ; Arthritis, Rheumatoid/pathology* ; Inflammation/pathology* ; Bone and Bones/pathology* ; Bone Resorption/pathology*

Multiple myeloma (MM) is a B cell malignancy characterized by enhanced bone loss that commonly associated with diffuse osteopenia, focal lytic lesions, pathologic fractures, and bone pain. The key mechanism of bone damage in myeloma is the abnormal regulation in bone metastasis, with increased osteoclast function and decreased osteoblast activity. This article reviewed the factors implicated, such as receptor activator of nuclear factor-kappaB (RANK), receptor activator of nuclear factor-kappaB ligand (RANKL), osteoprotegerin (OPG), macrophage inflammatory protein-1alpha (MIP-1alpha), SDF-1 and Wnt pathway. Further understanding of the regulation system of bone homeostasis helps to offer possible targets for future therapy.
Bone Diseases ; etiology ; Bone and Bones ; pathology ; Humans ; Multiple Myeloma ; complications ; pathology ; Osteoblasts ; pathology ; Osteoclasts ; pathology

Animals ; Biomechanical Phenomena ; Bone Development ; Bone Remodeling ; Bone and Bones ; injuries ; Fracture Healing ; physiology ; Fractures, Bone ; pathology

Osteoarthritis (OA) is the most prevalent of joint diseases,and its pathology is characterized by the degeneration of cartilage, sclerosis of subchondral bone, and osteophyte formation. Localization of the early lesions of OA has not been clarified, but many researchers have focused on cartilage and have considered that changes in subchondral bone occur subsequently to the degeneration of cartilage. However, a low bone mineral density, particularly in the knee joint with OA, high bone turnover, and efficacy of bone resorption inhibitors for OA have recently been reported, suggesting that subchondral bone plays an important role in the pathogenesis of OA. This review aims to make a conclusion about advancement in research of subchondral bone in osteoarthritis.
Bone Remodeling ; Bone and Bones ; pathology ; Cartilage ; pathology ; Humans ; Osteoarthritis ; etiology ; pathology ; physiopathology

Bone and Bones ; pathology ; Humans ; Immunologic Deficiency Syndromes ; diagnosis ; Osteochondrodysplasias ; diagnosis

A approach to segment the color image based on Hue-Saturation-Value (HSV) space was proposed, and it was used to segment the color image digitized from the bone sections stained with Masson-Goldner's Trichrome by CCD camera. According to HSV approach, color image was transformed from RGB space to HSV space at first, and then the image was segmented by using the threshold value of hue (90 < H < 150) and saturation (S > 0.25) to find the image of the green color stained trabecular. And then used the threshold value of saturation (S < 0.2) and value (V > V(background) x 0.95) to find the unstained high brightness field. At last, unstained high brightness fields which were concluded in stained trabecular image were filled with the color of trabecular, so the completely trabecular image could be drawn. The results showed that HSV approach was fast and simple, and it could be an efficient automatic algorithm.
Algorithms ; Bone Density ; Bone and Bones ; pathology ; Color ; Humans ; Image Processing, Computer-Assisted ; Osteoporosis ; pathology ; Staining and Labeling

Bone Regeneration/*physiology ; *Bone Substitutes ; Bone and Bones/pathology ; Bone and Bones/surgery ; *Computer-Aided Design ; *Magnetic Resonance Imaging ; Organ Culture Techniques/*methods ; Tissue Engineering/*methods ; *Tomography, X-Ray Computed

Multiple myeloma is an incurable malignancy developed in the bone marrow plasma cell system. It usually consists of focal lesions of the bone,soft tissue lesions,and diffuse bone marrow infiltration. Currently,the diagnosis and follow-up of multiple myeloma are highly dependent on various medical imaging techniques.
Bone Marrow ; pathology ; Bone and Bones ; Diagnostic Imaging ; Humans ; Magnetic Resonance Imaging ; Multiple Myeloma ; diagnosis

Heterotopic ossification of the xiphoid process is extremely rare, with only three cases previously reported. However, the surgical pathology for postoperative elongation of the xiphoid process after abdominal surgery has not yet been reported. We report a case of the postoperative elongation of the xiphoid process, 8 years after abdominal surgery for traumatic hemoperitoneum in a 53-year-old man. The patient underwent surgical excision of the elongated mass of the xiphoid process. Histopathology revealed multiple exostoses. Heterotopic ossification can occur after surgical trauma to soft or bone tissue. Surgical excision with primary closure is the treatment of choice for symptomatic heterotopic ossification.
Bone and Bones ; Exostoses ; Exostoses, Multiple Hereditary ; Hemoperitoneum ; Humans ; Middle Aged ; Ossification, Heterotopic ; Pathology, Surgical ; Xiphoid Bone