オカザキ　ケン   OKAZAKI Ken   岡崎　賢    所属   医学部 医学科（東京女子医科大学病院）    職種   教授・基幹分野長
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	The vast majority of radiolucent lines disappeared at 3 years follow-up in modern cementless posterior stabilized mobile-bearing total knee arthroplasty.
掲載誌名	正式名：Archives of orthopaedic and trauma surgery 略　 称：Arch Orthop Trauma Surg ISSNコード：14343916/09368051
掲載区分	国外
巻・号・頁	145(1),pp.265
著者・共著者	Yoshinori Mikashima, Hitoshi Imamura, Yoshiko Shirakawa, Koichiro Yano, Hiroshi Takagi, Ken Okazaki
発行年月	2025/04
概要	PURPOSE:The purpose of this study was to evaluate the natural history of radiolucent lines (RLLs) in modern cementless posterior-stabilized (PS) mobile-bearing total knee arthroplasty (TKA) at 3-year follow-up.METHODS:Our cohort was composed of 45 cementless and 45 cemented TKAs. Patients were retrospectively reviewed after 1:1 matching for age, gender, body mass index, and preoperative UCLA score. All operative procedures were performed by a single surgeon using a cementless or cemented TKA of the same design between 2019 and 2021. The incidence of RLLs was reviewed at 1 week, 6 months, 1 year, 2 years, and 3 years postoperatively. Bone on-growth over the surface of the implants were also reviewed at 3 years postoperatively. Fisher's exact test, independent Student's t-test, or Mann-Whitney U test were used for statistical analyses.RESULTS:Although the incidence of RLLs was significantly higher in cementless TKAs (33/45 knees; 73%) than that in cemented TKAs (10/45 knees; 22%, P <.01) at 6 months postoperatively, RLLs in cementless TKAs disappeared in 29 of 33 knees (88%) at 3-year postoperatively and those of cemented TKAs had increased up to 17 of 45 knees (38%). Bone on-growth over the surface of the implants was observed in 43 of 45 knees (93%) in the cementless TKAs at 3 years postoperatively.CONCLUSION:This study showed that nonprogressive RLLs in recently introduced cementless PS mobile-bearing TKA designs are expected to disappear over time.LEVEL OF EVIDENCE:Retrospective cohort study, Level III.
DOI	10.1007/s00402-025-05880-2
PMID	40274614