Turkish version of the Anterior Cruciate Ligament Quality of Life questionnaire.
OBJECTIVE
To test the measurement properties of Turkish version of the Anterior Cruciate Ligament Quality of Life (ACL-QOL) questionnaire.


METHODS
One hundred and nineteen patients with ACL reconstruction (ACL-R) completed internal consistency, agreement, construct validity, floor and ceiling effect analyses. Eighty out of 119 patients with ACL-R completed Turkish version of the ACL-QOL questionnaire twice for the test-retest reliability. A subgroup of thirty-nine patients undergoing physiotherapy were also asked to answer the ACL-QOL questionnaire, the Lysholm Knee Scale (LKS), Knee Outcome Survey-Activities of Daily Living Scale (KOS-ADLS) and the short form 36 (SF-36) at pre-operative, 16th week and 2 years post-operatively to assess responsiveness.


RESULTS
The questionnaire had high internal consistency (Cronbach's α = 0.95). The paired t test showed no significant difference between the test-retest means. The intraclass correlation was excellent for reliability and agreement in five domains and overall score (ICC 0.95, 0.95, 0.97, 0.95, 0.96 and 0.95; p < 0.001). The standard error of measurement and the minimum detectable change (MDC95) were found to be 3.1 points and 8.7 points, respectively. The questionnaire showed a fair correlation (r = 0.23) with LKS and a poor correlation (r = 0.14) with KOS-ADLS; good and very good construct validity (r = 0.51, r = 0.62) with SF-36 physical component score and mental component score, respectively. No ceiling and floor effects were observed except the subdomain of 'work-related concerns' (22.9 %). A dramatic effect size was demonstrated at the 16th week (2.1) and 2 years (1.1) of follow-up.


CONCLUSIONS
Turkish version of the ACL-QOL questionnaire is a reproducible and responsive instrument that can be used in clinical studies.


METHODS
Diagnostic study, Level I.
Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Hacettepe University, 06100, Ankara, Turkey. gizemirem83@yahoo.com.
Gizem Irem
GI
Kinikli
Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, İstanbul University, Istanbul, Turkey.
Derya
D
Celik
Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Hacettepe University, 06100, Ankara, Turkey.
Inci
I
Yuksel
Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Hacettepe University, 06100, Ankara, Turkey.
Ozgur Ahmet
OA
Atay
D000203:Activities of Daily Living; D000328:Adult; D016118:Anterior Cruciate Ligament / Q000601:surgery*; D005260:Female; D006801:Humans; D007718:Knee Injuries / Q000601:surgery*; D065466:Lysholm Knee Score; D008297:Male; D011788:Quality of Life; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014175:Translating; D014421:Turkey