title: Knee Arthritis Without Other Joint Symptoms in the Elderly With Seronegative Elderly Onset Rheumatoid Arthritis.
abstract: Elderly onset Rheumatoid arthritis (EORA) has important clinical distinctions when compared with younger onset RA (YORA). In knee arthritis of elderly patients, infection, crystal-induced arthritis or EORA should be suspected if elevation of CRP in the preoperative examination and turbid joint effusion in their knee joint are found. Furthermore, if joint swelling and effusion remain after performing total knee arthroplasty (TKA), the infection after TKA, implant debris-related arthritis and EORA should be considered. However, it is difficult to diagnose patients as EORA if Rheumatoid factor (RF) and anti-cyclic citrullinated peptide antibody (ACPA) are negative. The differential diagnosis is very important.
authors.affiliation: Department of Orthopaedic Surgery, National Hospital Organization Kanmon Medical Center, Simonoseki, Japan.
authors.forename: Takatomo
authors.initials: T
authors.lastname: Mine
authors.affiliation: Department of Orthopaedic Surgery, National Hospital Organization Kanmon Medical Center, Simonoseki, Japan.
authors.forename: Koichiro
authors.initials: K
authors.lastname: Ihara
authors.affiliation: Department of Orthopaedic Surgery, National Hospital Organization Kanmon Medical Center, Simonoseki, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kawamura
authors.affiliation: Department of Orthopaedic Surgery, National Hospital Organization Kanmon Medical Center, Simonoseki, Japan.
authors.forename: Ryutaro
authors.initials: R
authors.lastname: Kuriyama
authors.affiliation: Department of Orthopaedic Surgery, National Hospital Organization Kanmon Medical Center, Simonoseki, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Date
keywords: Arthroscopy; Elderly person; Knee arthritis; Rheumatoid arthritis; Seronegative RA; Synovitis