BACKGROUND Some patients complain of noise after total knee arthroplasty (TKA). Controversy still exists on how the noise affects the clinical outcomes, including joint awareness, after TKA. The Forgotten Joint Score-12 (FJS-12) measures the clinical outcomes focusing on joint awareness after surgery. The Knee Society Scoring System-2011 (KSS-2011) includes questionnaires for satisfaction, expectation, and functional activities. The aim of this study is to clarify the relationship among FJS-12, KSS-2011, and the noise. Furthermore, the relationship between FJS-12 and KSS-2011 was validated. METHODS Using FJS-12 and KSS-2011, 295 knees from 225 patients who underwent TKA were retrospectively evaluated. Noise perception was evaluated by a questionnaire with five grades, a method that follows the questionnaire form of FJS-12 ("Are you aware of the noise of your artificial joint?"; never, almost never, seldom, sometimes, mostly). Correlations among FJS-12, KSS-2011, and noise were analyzed. The patients were divided into four groups based on the mechanism of their implant [cruciate retaining, posterior stabilized, cruciate sacrificed, and bicruciate stabilized (BCS)]. FJS-12, KSS-2011, and noise were compared among the groups. RESULTS A strong correlation was found between FJS-12 and total score of KSS-2011 (0.70; P < 0.001). FJS-12 correlated with KSS-2011 subcategories of "symptoms," "satisfaction," and "standard activities," with correlation coefficients at approximately 0.60. Noise had weak correlations with FJS-12 (0.28; P < 0.001) and KSS-2011 (0.20 P < 0.001). In comparing the TKA mechanisms, BCS had remarkably better KSS-2011 and greater movement range but worse noise scores. CONCLUSIONS Noise perception after TKA had limited effect on joint awareness and clinical outcomes. FJS-12 correlated strongly with KSS-2011 and associated with satisfaction, residual symptoms, and daily activities, as assessed by KSS-2011 subscores. TRIAL REGISTRATION This study was approved by the Medical Ethical Committee of the Tokyo Women's Medical University (approval number: 4681 on March 2, 2018).

中文翻译：

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回顾性研究：全膝关节置换术后的噪音对关节意识和患者报告的临床结果影响有限。

背景技术一些患者在全膝关节置换术（TKA）后抱怨出现噪音。关于TKA术后噪声如何影响临床结果（包括关节意识）仍存在争议。被遗忘的关节评分12（FJS-12）衡量临床结果，重点是术后的关节意识。膝盖学会评分系统2011（KSS-2011）包括满意度，期望和功能活动的问卷。这项研究的目的是弄清FJS-12，KSS-2011与噪声之间的关系。此外，验证了FJS-12与KSS-2011之间的关系。方法使用FJS-12和KSS-2011对225例行TKA手术的295膝进行回顾性评估。噪声感知程度通过FSS-12问卷形式的五个等级的问卷进行评估（“ BCS的KSS-2011更好，运动范围更大，但噪音分数却更差。结论TKA后的噪声感知对关节意识和临床结果的影响有限。FJS-12与KSS-2011密切相关，并与满意度，残留症状和日常活动相关，如KSS-2011子评分所评估。试验注册本研究得到东京女子医科大学医学伦理委员会的批准（批准号：4681,2018年3月2日）。