osteoarthritis
                                                        
                                                                                                            
                                                            
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            hyaluronic acid
                                                        
                                                                                                            
                                                            
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            high molecular weight
                                                        
                                                                                                            
                                                            
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            intra-articular injection
                                                        
                                                                                                            
                                                            
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            viscosupplementation
                                                        
                                                                                                                                                                                         
                                                                        
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                                        Background: Osteoarthritis OA is the most common joint disorder in the world. Injection of high molecular weight hyaluronic acid intra-articular with steroid is a one of the used therapeutic option for patients with (OA)knee.
Objectives: Objective of this study was the evaluation the efficacy, safety, pluse duration of action of viscosupplementation of the  HMWHA( high molecular weight hyluranic acid ).
Type of the study: Cross-sectional study.
Methods: From 81 patients with sever knee pain due to OA (grades 3–4) were recruited from Al-Yarmouk teaching hospital  & a private clinic during the period from January 2014 till July 2016.
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