Role of Fat-Soluble Vitamins in Osteoarthritis ManagementZheng, Xiao-yan, MD*; Liang, Jun, MD*; Li, Yu-sheng, MD†; Tu, Min, MD*JCR: Journal of Clinical Rheumatology: April 2018 - Volume 24 - Issue 3 - p 132–137 doi: 10.1097/RHU.0000000000000587 Review Abstract Author Information Osteoarthritis (OA) is a chronic degenerative joint disease, in which metabolic imbalance in bone is observed. The pathological mechanism of metabolic imbalance is not clear yet, but the nutritional factors, particularly the vitamins, might be intrinsic to the development and progression of OA. In this review article, we have explored databases such as PubMed, Scopus, and Google Scholar articles until the beginning of 2017 and reviewed the role of fat-soluble vitamins in pathological and therapeutic aspects of OA. Vitamin D plays an important role in the development and maintenance of the skeleton, as well as bone and cartilage metabolism, and its deficiency is implicated in the pathological process of OA. Vitamin E enhances chondrocyte growth and exhibits an anti-inflammatory activity, as well as plays an important role in the prevention of cartilage degeneration. In human OA cartilage, vitamin K deficiency produces abnormal growth plate calcification and inappropriate mineralization of cartilage. Thus, these fat-soluble vitamins play a key role in the pathophysiology of OA, and supplementation of these vitamins may provide innovative approaches for OA management. However, vitamin A has a different role, which is a regulator of cartilage and skeletal formation. When metabolite levels of vitamin A are elevated in synovial fluid, they appear to drive OA development. The role of inhibitors of vitamin A here remains unclear. More investigations are needed to examine the effects of fat-soluble vitamins on the various molecular pathways of OA, as well as to assess the efficacy and safety of their usage clinically. From the *Department of Orthopedics, Second People’s Hospital of Jingmen, Jingmen; and †Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, China. This work was supported by the Provincial Science Foundation of Hubei (No.2016cfb110). The authors declare no conflict of interest. Correspondence: Min Tu, MD, Department of Orthopaedics, Second People's Hospital of Jingmen, Jingmen, HuBei 448000, China. E-mail: firstname.lastname@example.org. Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved.