TY - JOUR
T1 - Development and validation of a culturally relevant Japanese KOOS
AU - Lyman, Stephen
AU - Omori, Go
AU - Nakamura, Norimasa
AU - Takahashi, Toshiaki
AU - Tohyama, Harukazu
AU - Fukui, Naoshi
AU - Ikeda, Hiroshi
AU - Sasho, Takahisa
AU - Saito, Tomoyuki
AU - Hayashi, Yasuhisa
AU - Deie, Matsutaka
N1 - Funding Information:
1) Takashi Nakamura, M.D. Ph.D. (Department of Orthopaedic Surgery, Toho University) for co-operation in Phase-1 study. 2) Eiichi Nakamura, M.D. Ph.D. (Department of Orthopaedic Surgery, Kumamoto University) for co-operation in Phase-1study. 3) Mai Kumagami (Center for Language Studies, Nagasaki University) for co-operation in translation English to Japanese. 4) Mitsuo Ochi（President of Japanese Orthopaedic Society of Knee, Arthroscopy and Sports Medicine: JOSKAS）for comprehensive support to the project.
Publisher Copyright:
© 2018 The Japanese Orthopaedic Association
PY - 2019/5
Y1 - 2019/5
N2 - Introduction: The Knee Injury and Osteoarthritis Outcomes Survey (KOOS) has been translated into 50 languages worldwide. These translations have adhered to guidelines for cross cultural adaptation of health surveys. However, after release of the Japanese KOOS (JKOOS) we discovered the JKOOS was not fully culturally relevant to Japanese patients. Therefore, we undertook the development and validation of the JKOOS+. Methods: We completed this project in 2 phases across 9 hospitals. In Phase 1, 187 surgically naïve patients with knee pain were asked about activities limited by their knee pain. An expert panel reconciled these activities against existing KOOS items to identify novel items. In Phase 2, 241 surgically naïve patients with knee pain were administered the Japanese Oxford Knee Survey, JKOOS, and these novel items. An iterative Rasch analysis was used to test item fit of these novel items within the KOOS Activities of Daily Living (ADL) domain and a potential new domain. Unidimensionality was assessed using principle component analysis. Internal consistency (Cronbach's alpha) and external validity (Spearman's Correlations) were assessed for Japanese ADL (J-ADL) and the novel domain. Results: Phase 1 identified 4 activities relevant to Japanese knee patients: sitting seiza, using a Japanese toilet, climbing hills, and getting on/off a bus/train. In Phase 2, climbing hills and bus/train were well fit in JADL. Seiza and using a Japanese toilet were not well fit in J-ADL, yet both require deep knee flexion so a knee flexion (KF) domain was constructed by considering all KOOS items that require knee flexion using an iterative Rasch model. An 8 item KF domain emerged. Both J-ADL and KF were deemed to be unidimensional with high internal consistency (Cronbach's alpha >0.92) and external validity (Spearman Correlations 0.723–0.929). Conclusions: We have successfully developed and validated JKOOS+, a more culturally relevant knee survey for Japanese patients.
AB - Introduction: The Knee Injury and Osteoarthritis Outcomes Survey (KOOS) has been translated into 50 languages worldwide. These translations have adhered to guidelines for cross cultural adaptation of health surveys. However, after release of the Japanese KOOS (JKOOS) we discovered the JKOOS was not fully culturally relevant to Japanese patients. Therefore, we undertook the development and validation of the JKOOS+. Methods: We completed this project in 2 phases across 9 hospitals. In Phase 1, 187 surgically naïve patients with knee pain were asked about activities limited by their knee pain. An expert panel reconciled these activities against existing KOOS items to identify novel items. In Phase 2, 241 surgically naïve patients with knee pain were administered the Japanese Oxford Knee Survey, JKOOS, and these novel items. An iterative Rasch analysis was used to test item fit of these novel items within the KOOS Activities of Daily Living (ADL) domain and a potential new domain. Unidimensionality was assessed using principle component analysis. Internal consistency (Cronbach's alpha) and external validity (Spearman's Correlations) were assessed for Japanese ADL (J-ADL) and the novel domain. Results: Phase 1 identified 4 activities relevant to Japanese knee patients: sitting seiza, using a Japanese toilet, climbing hills, and getting on/off a bus/train. In Phase 2, climbing hills and bus/train were well fit in JADL. Seiza and using a Japanese toilet were not well fit in J-ADL, yet both require deep knee flexion so a knee flexion (KF) domain was constructed by considering all KOOS items that require knee flexion using an iterative Rasch model. An 8 item KF domain emerged. Both J-ADL and KF were deemed to be unidimensional with high internal consistency (Cronbach's alpha >0.92) and external validity (Spearman Correlations 0.723–0.929). Conclusions: We have successfully developed and validated JKOOS+, a more culturally relevant knee survey for Japanese patients.
UR - http://www.scopus.com/inward/record.url?scp=85058935924&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85058935924&partnerID=8YFLogxK
U2 - 10.1016/j.jos.2018.11.014
DO - 10.1016/j.jos.2018.11.014
M3 - Article
C2 - 30591399
AN - SCOPUS:85058935924
SN - 0949-2658
VL - 24
SP - 514
EP - 520
JO - Journal of Orthopaedic Science
JF - Journal of Orthopaedic Science
IS - 3
ER -