title: [A novel questionnaire to assess activity in patients after hip arthroplasties].
abstract: BACKGROUND
  Until now, the activity of the lower limb could only be exactly measured with expensive electronic pedometers. The aim of this study was to develop a feasible questionnaire to measure the activity of patients after arthroplasty.
  
  
  METHODS
  The "Daily Activity Questionnaire" (DAQ) was developed in several steps and the evaluation was carried out in three groups of patients with osteoarthritis of the hip (160 patients and 855 investigated days). The psychometric characteristics were verified.
  
  
  RESULTS
  The retest reliability (ICC) of the DAQ is in a range comparable to the electronic pedometer StepWatch. The testing of the criterion validity showed high correlations between the StepWatch and the DAQ (r=0.743).
  
  
  CONCLUSIONS
  Because of its high correlations to the load changes actually performed, the DAQ is especially suited to answer arthroplasty-related questions. In all patient groups, projected load changes between 1.8 and 2.4 million per year were found, which by far exceed the generally accepted test standards for endoprostheses.
authors.affiliation: Orthopädische Klinik, König-Ludwig-Haus, Universität Würzburg, Würzburg, Deutschland.
authors.forename: N
authors.initials: N
authors.lastname: Wollmerstedt
authors.forename: U
authors.initials: U
authors.lastname: Nöth
authors.forename: F
authors.initials: F
authors.lastname: Mahlmeister
authors.forename: A
authors.initials: A
authors.lastname: Lotze
authors.forename: A
authors.initials: A
authors.lastname: Finn
authors.forename: J
authors.initials: J
authors.lastname: Eulert
authors.forename: C
authors.initials: C
authors.lastname: Hendrich
mesh_terms: D000203:Activities of Daily Living / Q000145:classification*; D000328:Adult; D000368:Aged; D000465:Algorithms; D019644:Arthroplasty, Replacement, Hip / Q000534:rehabilitation*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D018670:Monitoring, Ambulatory / Q000295:instrumentation; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D016474:Weight-Bearing