Abstract： To the Editor:Rheumatoid arthritis (RA) is a chronic inflammatory disorder characterized by synovial hyperplasia and joint destruction.The knee is the most commonly affected joint in patients with RA,and approximately 25％ of patients with RA will undergo joint replacement within 22 years.[1] Total-knee arthroplasty (TKA) is a successful treatment for patients with severe joint pain due to osteoarthritis or RA.Concerns regarding increased loosening rates and potential need for multiple revision surgeries have traditionally discouraged the use of TKA in patients under 60 years old.[2] Although results in young patients are encouraging,[3] little mid-term follow-up data are available.Other researchers focus on the controversial subject of resurfacing in TKA.Comparisons of the results in resurfaced and non-resurfaced arthroplasties have found no significant differences between the two groups,while others have argued that resurfacing of the patella should be performed routinely.Therefore,we reported the mid-term survival of a successful knee arthroplasty design in patients with RA under 60 years old and compared the difference between resurfacing group and non-resurfacing group.