Introduction/objectives Knee osteoarthritis (OA) is a common condition impacting quality of life by limiting daily activities. This study aimed to translate and culturally adapt the Knee Quality of Life 26-item (KQoL-26) questionnaire into Turkish and assess its validity and reliability in individuals with knee OA. Method The study included 182 patients with primary knee OA. Its comprehensibility was piloted with 10 patients and 10 healthcare professionals. Patients provided demographic and clinical information and completed the Short Form-36 (SF-36), Knee Injury and Osteoarthritis Outcome Score (KOOS), Western Ontario and McMaster University Osteoarthritis Index (WOMAC), and the Turkish KQoL-26. SF-36, KOOS, and WOMAC assessed the construct validity of the KQoL-26. To measure test–retest reliability, the KQoL-26 was re-administered after three days. Results The KQoL-26 demonstrated high internal consistency with a Cronbach’s α of 0.965. Subscale α values were 0.945 (physical functioning), 0.915 (activity limitations), and 0.903 (emotional functioning). Test–retest analysis revealed Intraclass Correlation Coefficient (ICC) values from 0.791 to 0.954 for items and 0.948 to 0.963 for subscales. The KQoL-26 scores correlated positively with SF-36 and KOOS and negatively with WOMAC (p < 0.001). Conclusion The Turkish KQoL-26 is a valid and reliable tool for assessing knee-related quality of life in knee OA patients.<Table Float="No" ID="Taba"> <tgroup cols="2"> <colspec align="left" colname="c1" colnum="1" /> <colspec align="left" colname="c2" colnum="2" /> <tbody> <row> <entry align="left" nameend="c2" namest="c1"> Key Points • The results of this study concluded that the Turkish version of the KQoL-26 is a valid and reliable tool for assessing the quality of life in patients with knee OA. • The Turkish version of the KQoL-26, being a practical and versatile tool for assessing quality of life, demonstrates its applicability in both clinical practice and academic research. • The Turkish version of the KQoL-26, showing similarity to commonly used scales in OA assessment, can be used as an alternative to these questionnaires. </entry> </row> </tbody> </tgroup> </Table>

Adaptation of the knee quality of life 26-item questionnaire to turkish: cultural adaptation, reliability, and validity

期刊论文
发表日期：

2025年10月15日

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Özlem Nur Tok Yaman,
Burcu Camcıoğlu Yılmaz,
Baki Umut Tuğay,
İsmail Murad Pepe

摘要

Introduction/objectives

Knee osteoarthritis (OA) is a common condition impacting quality of life by limiting daily activities. This study aimed to translate and culturally adapt the Knee Quality of Life 26-item (KQoL-26) questionnaire into Turkish and assess its validity and reliability in individuals with knee OA.

Method

The study included 182 patients with primary knee OA. Its comprehensibility was piloted with 10 patients and 10 healthcare professionals. Patients provided demographic and clinical information and completed the Short Form-36 (SF-36), Knee Injury and Osteoarthritis Outcome Score (KOOS), Western Ontario and McMaster University Osteoarthritis Index (WOMAC), and the Turkish KQoL-26. SF-36, KOOS, and WOMAC assessed the construct validity of the KQoL-26. To measure test–retest reliability, the KQoL-26 was re-administered after three days.

Results

The KQoL-26 demonstrated high internal consistency with a Cronbach’s α of 0.965. Subscale α values were 0.945 (physical functioning), 0.915 (activity limitations), and 0.903 (emotional functioning). Test–retest analysis revealed Intraclass Correlation Coefficient (ICC) values from 0.791 to 0.954 for items and 0.948 to 0.963 for subscales. The KQoL-26 scores correlated positively with SF-36 and KOOS and negatively with WOMAC (p < 0.001).

Conclusion

The Turkish KQoL-26 is a valid and reliable tool for assessing knee-related quality of life in knee OA patients.

Key Points

• The results of this study concluded that the Turkish version of the KQoL-26 is a valid and reliable tool for assessing the quality of life in patients with knee OA.

• The Turkish version of the KQoL-26, being a practical and versatile tool for assessing quality of life, demonstrates its applicability in both clinical practice and academic research.

• The Turkish version of the KQoL-26, showing similarity to commonly used scales in OA assessment, can be used as an alternative to these questionnaires.