[A novel questionnaire to assess activity in patients after hip arthroplasties].

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).