Abstract
IntroductionThe patient’s perspective plays a key role in judging the effect of knee disorders on physical function. We have introduced the Subjective Knee Value (SKV) to simplify the evaluation of individual’s knee function by providing one simple question. The purpose of this prospective study was to validate the SKV with accepted multiple-item knee surveys across patients with orthopaedic knee disorders.Materials and methodsBetween January through March 2020, consecutive patients (n = 160; mean age 51 ± 18 years, range from 18 to 85 years, 54% women) attending the outpatient clinic for knee complaints caused by osteoarthritis (n = 69), meniscal lesion (n = 45), tear of the anterior cruciate ligament (n = 23) and focal chondral defect (n = 23) were invited to complete a knee-specific survey including the SKV along with the Knee Injury Osteoarthritis Outcome Score (KOOS) and the International Knee Documentation Committee subjective knee form (IKDC-S). The Pearson correlation coefficient was used to evaluate external validity between the SKV and each patient-reported outcome measure (PROM) separately. Furthermore, patient’s compliance was assessed by comparing responding rates.ResultsOverall, the SKV highly correlated with both the KOOS (R = 0.758, p < 0.05) and the IKDC-S (R = 0.802, p < 0.05). This was also demonstrated across all investigated diagnosis- and demographic-specific (gender, age) subgroups (range 0.509–0.936). No relevant floor/ceiling effects were noticed. The responding rate for the SKV (96%) was significantly higher when compared with those for the KOOS (81%) and the IKDC-S (83%) (p < 0.05).ConclusionAt baseline, the SKV exhibits acceptable validity across all investigated knee-specific PROMs in a broad patient population with a wide array of knee disorders. The simplified survey format without compromising the precision to evaluate individual’s knee function justifies implementation in daily clinical practice.Level of evidenceII, cohort study (diagnosis).
Highlights
The patient’s perspective plays a key role in judging the effect of knee disorders on physical function
According to the underlying cause for consultation, knee osteoarthritis was found in 69 patients (44%), meniscal lesion in 45 patients (28%), anterior cruciate ligament (ACL) tear in 23 patients (14%) and focal chondral defect in 23 patients (14%)
While the Subjective Knee Value (SKV) was completely missing in only 6 patients (4%), the Knee Injury Osteoarthritis Outcome Score (KOOS) was incomplete in 56 patients (35%) and the International Knee Documentation Committee subjective knee form (IKDC-S) in 62 patients (39%) (p < 0.05)
Summary
The patient’s perspective plays a key role in judging the effect of knee disorders on physical function. We have introduced the Subjective Knee Value (SKV) to simplify the evaluation of individual’s knee function by providing one simple question The purpose of this prospective study was to validate the SKV with accepted multiple-item knee surveys across patients with orthopaedic knee disorders. Numerous injury-specific rating scales have been utilized in physician-based knee surveys have been routinely used in the past decades [10, 11], the patient’s perspective has become increasingly important in recent years. Among a core outcome measure set, the Knee Injury Osteoarthritis Outcome Score (KOOS) [13] and the International Knee Documentation Committee (IKDC) [14] knee survey are validated multipleitem tools for comprehensive assessment of knee disorders in both clinical and research contexts. It is widely accepted that those rating scales are responsive, valid and effective in a wide array of pathologies [19, 20, 22,23,24,25]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
