Molecular maps of synovial cells in inflammatory arthritis using an optimized synovial tissue dissociation protocol.

In this study, we optimized the dissociation of synovial tissue biopsies for single-cell omics studies and created a single-cell atlas of human synovium in inflammatory arthritis. The optimized protocol allowed consistent isolation of highly viable cells from tiny fresh synovial biopsies, minimizing the synovial biopsy drop-out rate. The synovium scRNA-seq atlas contained over 100,000 unsorted synovial cells from 25 synovial tissues affected by inflammatory arthritis, including 16 structural, 11 lymphoid, and 15 myeloid cell clusters. This synovial cell map expanded the diversity of synovial cell types/states, detected synovial neutrophils, and broadened synovial endothelial cell classification. We revealed tissue-resident macrophage subsets with proposed matrix-sensing (FOLR2+COLEC12high) and iron-recycling (LYVE1+SLC40A1+) activities and identified fibroblast subsets with proposed functions in cartilage breakdown (SOD2highSAA1+SAA2+SDC4+) and extracellular matrix remodeling (SERPINE1+COL5A3+LOXL2+). Our study offers an efficient synovium dissociation method and a reference scRNA-seq resource, that advances the current understanding of synovial cell heterogeneity in inflammatory arthritis.

Mixed crystal arthropathy of the wrist: The contribution of imaging in the diagnostic approach / Artropatía cristalina mixta de la muñeca: la contribución de la imagen en el enfoque diagnóstico

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Treatment of persistent cutaneous atrophy after corticosteroid injection with fat graft / Tratamiento de la atrofia e hipopigmentación cutánea secundaria a infiltración de corticosteroides con injerto de grasa

Subcutaneous fat atrophy and hypopigmentation are potential adverse side effects of local corticosteroid injection that may resolve spontaneously within 1-2 years. This report shows that fat grafting provides a simple, effective and safe correction of corticosteroid induced cutaneous atrophy with very satisfying esthetic and functional results

La atrofia de la grasa subcutánea y la despigmentación de la piel son efectos secundarios adversos potenciales de la inyección local de corticosteroides que pueden resolverse espontáneamente en 1-2 años. Este caso muestra que el injerto de grasa proporciona una corrección simple, eficaz y segura de estas complicaciones con resultados estéticos y funcionales muy satisfactorios