title: Cemented ceramic YMCK total knee arthroplasty in patients with severe rheumatoid arthritis.
abstract: Total knee arthroplasty (cemented) using a ceramic Yokohama Medical Ceramic Knee (YMCK) (Kyocera Corp; Kyoto, Japan) prosthesis was evaluated in 90 knees of 64 patients with severe rheumatoid arthritis, with a mean age of 59 +/- 11 years. The mean follow-up period was 56 +/- 20 months (range, 27 to 97 months). Larsen's grading of rheumatoid arthritis revealed grade 2 in 3, grade 3 in 36, grade 4 in 36, and grade 5 in 15 of 90 knees. Of 64 patients, 9 were judged to have class 1, 30 were judged to have class 2, and 25 were judged to have class 3 functional disability. The American Knee Society knee score and function score improved from 41 +/- 16 and 29 +/- 22 preoperatively to 83 +/- 14 and 50 +/- 29 at the final follow-up (P <.0001) even in patients with multiple joint involvement. Radiographs at the final follow-up showed satisfactory insertion of all prostheses, with no osteolysis. A radiolucent line measuring <1 mm was observed around the tip of the pegs of the patellar dome in 3 knees. Complications consisted of infection (1 case) and femoral fractures (3 cases). There were no cases of ceramic fractures.
authors.affiliation: Department of Orthopedic Surgery, Yokohama City University, School of Medicine, Yokohama, Japan. koshino@med.yokohama-cu.ac.jp
authors.forename: Tomihisa
authors.initials: T
authors.lastname: Koshino
authors.forename: Renzo
authors.initials: R
authors.lastname: Okamoto
authors.forename: Toshitaka
authors.initials: T
authors.lastname: Takagi
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Saito
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001172:Arthritis, Rheumatoid / Q000601:surgery*; D019645:Arthroplasty, Replacement, Knee; D002516:Ceramics; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D011474:Prosthesis Design