title: Adjustments in 2011 KSS increase the clinical suitability.
abstract: The 2011 KSS is a valid clinical TKA questionnaire, but with a low completion rate (42%). Adjustments, focusing on optimizing scale features, are required to improve its clinical use. The low completion rates, non-optimal scale features, lacking rules or a combination of these factors where addressed, leading to the development of the adjusted 2011 KSS (2011 KSS-A). Four-hundred-ninety-nine primary TKA patients were addressed pre- and postoperative by mail. Clinimetric quality was evaluated. Seventy percent responded and 90% completed the scale. Internal consistency proved excellent with Cronbach's Alpha≥0.79 for all subscales. Strong correlations were found between the Functional Activity subscales and KOOS-PS (r=-0.63 to -0.87). All subscales improved significantly after intervention (r-range 14-33%, effect size 0.50-2.85). Postoperatively, ceiling effects were found in the subscales Symptoms (16%) and Walking & Standing (26%). Adjustments led to a shortened and simplified questionnaire while maintaining its clinimetric quality.
authors.forename: Remco N
authors.initials: RN
authors.lastname: Dinjens
authors.forename: Bernd
authors.initials: B
authors.lastname: Grimm
authors.forename: Ide C
authors.initials: IC
authors.lastname: Heyligers
authors.forename: Rachel
authors.initials: R
authors.lastname: Senden
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D019645:Arthroplasty, Replacement, Knee; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D063868:Patient Outcome Assessment; D017060:Patient Satisfaction; D015203:Reproducibility of Results; D057566:Self Report; D011795:Surveys and Questionnaires