Abstract Objective To investigate the reliability and validity of the International Physical Activity Questionnaire (IPAQ) long forms of patients after total knee arthroplasty. Methods This study was carried out on 45 patients who had undergone total knee arthroplasty between January 2016 and June 2017.Among them were 20 males and 25 females with an average age of (60.22±5.42) years(range 55~69 years).We assessed test re-test reliability by repeating the questionnaire one week later (n=45).Discriminant and content validity was analyzed using physical activity (PA),IPAQ long forms.Statistical analysis including the intraclass correlation coefficient (ICC) was carried out using the SPSS 24.0 software.Results The reliability of IPAQ long forms one week later (ICC=0.814~0.979).IPAQ long forms were compared with the PA,and wefound that the physical activity energy expenditure of walking activities,moderate physical activity (MPA),heavy physical activity,and total physical activity (TPA) for Intraclass correlation coefficient ranged from 0.70 to 0.87.Intraclass correlation coefficient values for walking activities were high (r=0.87).Conclusion The IPAQ long forms measure the activity of patients after total knee arthroplasty and has demonstrated reliability and validity.
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