The burden of osteoarthritis: development and validation of a new assessment tool (BONe'S).

Objective: To develop and validate a specific individual burden questionnaire, BONe'S (Burden of Osteoarthritis New Scale), assessing osteoarthritis (OA) patients in the broadest sense.

Research Design And Methods: Items included in BONe'S were identified by literature review, and patient/healthcare practitioner interviews, and refined via item reduction and exploratory factor analysis (EFA). Internal consistency was calculated using Cronbach's α; concurrent validity was assessed by calculating the correlation between BONe'S and the Short Form (SF)-12 Health Survey and Psychological General Well-Being Index (PGWBI).