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	Medial soft tissue contracture does not always exist in varus osteoarthritis knees in total knee arthroplasty.
掲載誌名	正式名：Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA 略　 称：Knee Surg Sports Traumatol Arthrosc ISSNコード：14337347/09422056
掲載区分	国外
巻・号・頁	27(5),pp.1642-1650
著者・共著者	Ushio Tetsuro†, Mizu-Uchi Hideki, Okazaki Ken, Miyama Kazuki, Akasaki Yukio, Ma Yuan, Nakashima Yasuharu
発行年月	2019/05
概要	PURPOSE:To evaluate preoperative soft tissue balance for total knee arthroplasty (TKA), varus/valgus stress radiographs has been used in previous studies. While the joint line of femur and tibia is almost parallel in healthy and postoperative knees, osteoarthritis (OA) knees exhibit articular cartilage wear that causes the joint line tilting even in a non-stress condition. Therefore, the exact angle of the joint line might mislead to understand the joint laxity in OA knees. The purpose of this study was to evaluate soft tissue balance in varus OA knees using preoperative stress radiographs under three different constant loads, taking the articular cartilage wear into consideration.METHODS:One hundred and eighteen varus-deformed OA knees in 102 patients were investigated before primary TKA. Preoperative knee radiographs were obtained in the anteroposterior view with no stress (defined as the neutral condition) and with varus and valgus stresses (5, 10, and 15 kg) in extension. Two different types of joint line angle (JLA), the absolute JLA (an exact angle of joint line) and the relative JLA (the absolute JLA minus the JLA in the neutral condition), were compared for the same load with the paired t test.RESULTS:The absolute JLA was 7.9 ± 1.2°/- 1.5 ± 2.2° under varus/valgus 15 kg stress, 6.7 ± 2.4°/- 0.3 ± 2.1° under varus/valgus 10 kg stress, and 4.7 ± 2.4°/1.1 ± 2.2° under varus/valgus 5 kg stress. Significant differences in the numerical values of the absolute JLA were observed between varus and valgus stresses for each load. The neutral JLA was 3.2 ± 2.0°.
DOI	10.1007/s00167-018-5276-9
PMID	30402662