Forgotten Joint Score for early outcome assessment after total knee arthroplasty: Is it really useful?
10.1186/s43019-020-00049-0
- Author:
Qunn Jid LEE
1
;
Wai Yee Esther CHANG
;
Yiu Chung WONG
Author Information
1. Total Joint Replacement Center, Yan Chai Hospital, Tsuen Wan, Hong Kong SAR, China
- Publication Type:R E S E A R C H A R T I C L E
- From:The Journal of Korean Knee Society
2020;32(3):e37-
- CountryRepublic of Korea
- Language:English
-
Abstract:
Background:Forgotten Joint Score (FJS) has become a popular tool for total knee arthroplasty (TKA), but almost all studies had assessment performed 1 year after surgery. There is a need for a sensitive tool for earlier outcome assessment. The aim of this study was to investigate the usefulness of FJS within the first year after TKA.
Methods:This was a cross-sectional study. Patients within the first year after primary TKA were recruited. FJS was translated into the local language with a cross-cultural adaptation and was validated by assessing the correlation with the Western Ontario and McMaster Universities Arthritis Index score (WOMAC). Ceiling and floor effects (highest or lowest 10% or 15%) of both scores were compared. Skewness of scores was assessed with a histogram.
Results:One hundred sixty-three subjects were recruited: 84 (51.5%) had evaluation at 3 months after the operation, 56 (34.4%) at 6 months, and 23 (14.1%) at 12 months. FJS had fewer patients at the highest 10% (10.7% vs. 16.1%, P = 0.046) or 15% (19.6% vs. 32.1%, P = 0.027) at 6 months and within the first year overall (6.7% vs. 13.5%, P <0.001; 14.1% vs. 22.7%, P <0.001). Also, it had more patients at the lowest 10% (16.7% vs. 0%, P <0.001) or 15% (21.4% vs. 0%, P < 0.001) at 3 months, 6 months (10.7% vs. 0%,P <0.001), and overall (12.9% vs. 0%, P <0.001; 16.6% vs. 0%, P <0.001). The skewness was much less than WOMAC (0.09 vs. −0.56).
Conclusions:FJS has a low ceiling effect but a high floor effect in the first year after TKA. Such characteristics make it less useful for the general assessment of early patient report outcome after operation.
