Department of Joint Surgery, Third Hospital of Hebei Medical University, Shijiazhuang, China.
Orthop Surg. 2020 Feb;12(1):218-223. doi: 10.1111/os.12613.
To investigate the temporal relationship of medial unicompartmental knee arthroplasty (UKA) and forgotten joint score (FJS), and to analysis the predictive factors associated with FJS after medial UKA.
This is a cross-sectional observational study. A total of 188 cases of medial UKA were included in this study, and all the prostheses used were Oxford mobile-bearing UKA from January 2016 to January 2019. All patients have completed the questionnaire of FJS, and the relevant data were obtained for 1 month (n = 38), 6 month (n = 40), 12 month (n = 42), 24 month (n = 34), and 36 month (n = 34) patient subgroups. The score ranged from 0-100, with a higher score indicating a more natural knee joint. In addition, the associations between the potential influencing factors (body mass index [BMI], age, gender, duration of onset before surgery, Kellgren-Lawrence grade of the medial compartment before surgery) with FJS were analyzed using Pearson correlation and multiple linear regression.
Postoperative FJSs were 44.5 ± 13.5 at 1 month，63.8 ± 10.1 at 6 months, 77.1 ± 12.2 at 12 months, 78.4 ± 12.2 at 24 months, 78.9 ± 12.5 at 36 months. The postoperative FJSs were lowest at 1 month and highest at 36 month (P < 0.01). The mean value of FJS kept improving until 12 months post-operation, which was slightly lower than that of 24 months and 36 months, but there was no statistical difference between them. Pearson correlation and multiple linear regression analysis showed that gender and Kellgren-Lawrence grade of the medial compartment before surgery had no significant influence on FJS, while age, BMI, and duration of onset before surgery had significant associations with FJS after UKA. BMI was negatively correlated with FJS, while older patients (>60) and with longer duration of onset before surgery (>3 years) were a positive predictor of good outcome for the FJS.
Patients can expect marked improvement in the natural feel of the prosthesis during the first year after UKA, slight continued improvement at 2 and 3 years. Furthermore, we identified three preoperative patient-related factors (age, BMI, and duration of onset before surgery) that may predict the FJS after medial UKA, which can be used to guide surgical decision making.
探讨内侧单髁膝关节置换术（UKA）与遗忘关节评分（FJS）的时间关系，并分析与内侧 UKA 后 FJS 相关的预测因素。
这是一项横断面观察性研究。共纳入 188 例内侧 UKA 患者，所有使用的假体均为 2016 年 1 月至 2019 年 1 月期间的牛津活动衬垫型 UKA。所有患者均完成了 FJS 问卷，其中 1 个月（n = 38）、6 个月（n = 40）、12 个月（n = 42）、24 个月（n = 34）和 36 个月（n = 34）的患者亚组获得了相关数据。评分范围为 0-100，得分越高表明膝关节越自然。此外，使用 Pearson 相关性和多元线性回归分析了 BMI、年龄、性别、术前发病时间、术前内侧间室 Kellgren-Lawrence 分级等潜在影响因素与 FJS 之间的关系。
术后 1 个月 FJS 为 44.5 ± 13.5，术后 6 个月为 63.8 ± 10.1，术后 12 个月为 77.1 ± 12.2，术后 24 个月为 78.4 ± 12.2，术后 36 个月为 78.9 ± 12.5。术后 1 个月 FJS 最低，术后 36 个月 FJS 最高（P < 0.01）。术后 12 个月 FJS 均值持续改善，略低于术后 24 个月和 36 个月，但无统计学差异。Pearson 相关性和多元线性回归分析显示，性别和术前内侧间室 Kellgren-Lawrence 分级对 FJS 无显著影响，而年龄、BMI 和术前发病时间与 UKA 后 FJS 显著相关。BMI 与 FJS 呈负相关，而年龄较大（>60 岁）和术前发病时间较长（>3 年）是 FJS 良好预后的阳性预测因素。
患者可期待 UKA 后 1 年内假体的自然感明显改善，2 年和 3 年时稍有持续改善。此外，我们确定了三个与患者相关的术前因素（年龄、BMI 和术前发病时间）可能预测内侧 UKA 后的 FJS，可用于指导手术决策。
