TY - JOUR
T1 - Construct validity of the DynaPort®KneeTest
T2 - A comparison with observations of physical therapists
AU - Mokkink, Lidwine B.
AU - Terwee, Caroline B.
AU - van Lummel, Rob C.
AU - de Witte, Simon J.
AU - Wetzels, Leo
AU - Bouter, Lex M.
AU - de Vet, Henrica C.W.
PY - 2005/8/1
Y1 - 2005/8/1
N2 - Objective: To assess the construct validity of the DynaPort®KneeTest (KneeTest), which is a performance-based test to assess functioning of patients with knee osteoarthritis (OA). Scores on the KneeTest (KneeScore) were compared with observations of physical therapists of the patients' functional disability. The reliability of these observations was also assessed. Method: Twelve physical therapists received identical video tapes showing the performance of 33 patients on the KneeTest. Each physical therapist rated the functional disability of each patient, performing the 23 activities of the KneeTest, on 23 Visual Analogue Scales (VASactivity). The 23 VASactivity scores were averaged into a VASaverage score. At the end of the test, an overall rating for the general performance of the patient was given on a VASoverall. Inter-observer Reliability was assessed for the VASactivity scores, VASaverage, and the VASoverall. Results: Inter-observer reliability of the VASaverage was higher (ICC 0.85, 95% CI 0.74-0.92) than the VASoverall (ICC 0.65, 95% CI 0.51-0.77). The correlation between the KneeScore and the VASaverage, averaged over the 12 physiotherapists, was 0.86. Conclusion: The construct validity of the KneeTest was supported by the strong correlation with the ratings of the patients' disability by physical therapists. Given these findings and the high test-retest reliability of the KneeTest that was found in our previous study, we conclude that the KneeTest is a valid measure for assessing functioning in orthopedic and physical therapy research in patients with knee-OA before and after total knee replacement. Longitudinal validity has to be evaluated yet.
AB - Objective: To assess the construct validity of the DynaPort®KneeTest (KneeTest), which is a performance-based test to assess functioning of patients with knee osteoarthritis (OA). Scores on the KneeTest (KneeScore) were compared with observations of physical therapists of the patients' functional disability. The reliability of these observations was also assessed. Method: Twelve physical therapists received identical video tapes showing the performance of 33 patients on the KneeTest. Each physical therapist rated the functional disability of each patient, performing the 23 activities of the KneeTest, on 23 Visual Analogue Scales (VASactivity). The 23 VASactivity scores were averaged into a VASaverage score. At the end of the test, an overall rating for the general performance of the patient was given on a VASoverall. Inter-observer Reliability was assessed for the VASactivity scores, VASaverage, and the VASoverall. Results: Inter-observer reliability of the VASaverage was higher (ICC 0.85, 95% CI 0.74-0.92) than the VASoverall (ICC 0.65, 95% CI 0.51-0.77). The correlation between the KneeScore and the VASaverage, averaged over the 12 physiotherapists, was 0.86. Conclusion: The construct validity of the KneeTest was supported by the strong correlation with the ratings of the patients' disability by physical therapists. Given these findings and the high test-retest reliability of the KneeTest that was found in our previous study, we conclude that the KneeTest is a valid measure for assessing functioning in orthopedic and physical therapy research in patients with knee-OA before and after total knee replacement. Longitudinal validity has to be evaluated yet.
KW - DynaPort®KneeTest
KW - Performance-based test
KW - Physical therapist
KW - Reliability
KW - Validity
UR - http://www.scopus.com/inward/record.url?scp=22644440846&partnerID=8YFLogxK
U2 - 10.1016/j.joca.2005.04.008
DO - 10.1016/j.joca.2005.04.008
M3 - Article
C2 - 15951201
AN - SCOPUS:22644440846
SN - 1063-4584
VL - 13
SP - 738
EP - 743
JO - Osteoarthritis and Cartilage
JF - Osteoarthritis and Cartilage
IS - 8
ER -