Musculoskeletal Institute, Hôpital Pierre Paul Riquet, CHU Toulouse Purpan, 1 place Baylac, 31000, Toulouse, France.
Pediatric Orthopaedics Unit, Children Hospital, CHU Toulouse, Toulouse, France.
Knee Surg Sports Traumatol Arthrosc. 2021 Jun;29(6):1952-1959. doi: 10.1007/s00167-020-06281-1. Epub 2020 Sep 23.
The Simple Knee Value (SKV) is an outcome score in which patients are asked to grade their knee function as a percentage of that of a normal knee. The primary aim of this study was to validate the SKV by measuring its correlation with existing knee-related PROMs.
This was a prospective study conducted at a teaching hospital to assess the SKV's validity. The study enrolled 47 young patients (16-54 years old), 49 older patients (≥ 55 years) and 30 healthy controls. A paper questionnaire consisting of the Lysholm, IKDC, KOOS, WOMAC and SKV was given to subjects three times (enrolment, 1-month preoperative visit and 6 months postoperative visit). The criterion validity of the SKV was determined by correlating it to existing knee PROMs using the Spearman correlation coefficient (S). SKV test-retest reliability was assessed by the intraclass correlation coefficient (ICC) between two time points (initial consultation at enrolment and preoperative visit, reflecting the same clinical condition). Responsiveness to change was determined by comparing the SKV scores before and after surgery (enrolment consultation and 6 months postoperative). Discriminative ability was determined by comparing the SKV distribution in patients and controls.
There was a strong and significant correlation between the SKV and the gold standard Lysholm, IKDC, KOOS and WOMAC in the younger patients and the older patients (p < 0.0001). The reliability between the SKV at the initial consultation and before surgery was excellent (ICC 0.862, 95% CI 0.765; 0.921) in the younger patients, and moderate (ICC 0.506, 95% CI 0.265; 0.688) in the older patients. The SKV was responsive to change in both patient groups (p < 0.0001 for the SKV before versus 6 months after surgery). Like the other knee-specific PROMs (p < 0.0001), the SKV was able to distinguish between patients and controls (p < 0.0001).
The SKV is valid as it is significantly correlated to existing knee PROMs. It is also reliable, responsive to change and discriminating. Its simplicity gives it many advantages and it can be used by physicians in their daily practice.
Level II.
简单膝关节评分（SKV）是一种让患者将其膝关节功能按正常膝关节的百分比进行评分的结果评分。本研究的主要目的是通过测量 SKV 与现有的膝关节相关 PROM 的相关性来验证其有效性。
这是一项在教学医院进行的前瞻性研究，旨在评估 SKV 的有效性。该研究纳入了 47 名年轻患者（16-54 岁）、49 名老年患者（≥55 岁）和 30 名健康对照者。研究对象在三次就诊时（入组时、术前 1 个月和术后 6 个月）接受纸质问卷，内容包括 Lysholm、IKDC、KOOS、WOMAC 和 SKV。采用 Spearman 相关系数（S）将 SKV 与现有的膝关节 PROM 进行相关性分析，以确定其效标效度。采用两次就诊时间点之间的组内相关系数（ICC）评估 SKV 测试-重测信度（入组时的初始就诊和术前就诊，反映相同的临床状况）。通过比较术前和术后（入组咨询和术后 6 个月）的 SKV 评分来确定其反应度。通过比较患者和对照组之间的 SKV 分布来确定其判别能力。
在年轻患者和老年患者中，SKV 与金标准 Lysholm、IKDC、KOOS 和 WOMAC 之间均存在强且显著的相关性（p<0.0001）。在年轻患者中，SKV 在初始就诊时和术前的信度极好（ICC 0.862，95%CI 0.765-0.921），在老年患者中为中度（ICC 0.506，95%CI 0.265-0.688）。在两组患者中，SKV 均对变化有反应（p<0.0001，术前与术后 6 个月比较）。与其他膝关节特定 PROM 一样（p<0.0001），SKV 能够区分患者和对照组（p<0.0001）。
SKV 是有效的，因为它与现有的膝关节 PROM 显著相关。它还具有可靠性、对变化的反应能力和判别能力。其简单性使其具有许多优势，可由医生在日常实践中使用。
II 级。
