• A M Oosterwijk, L M Disseldorp, C P van der Schans, L J Mouton, and M K Nieuwenhuis.
• Hanze University of Applied Sciences Groningen, Research group Healthy Ageing, Allied Health Care and Nursing, Het Wiebenga, Petrus Driessenstraat 3, 9714 CA Groningen, The Netherlands; Association of Dutch Burn Centres, Burn Centre Martini Hospital, Van Swietenplein 1, 9728 NT Groningen, The Netherlands; University of Groningen, University Medical Center Groningen, Department of Rehabilitation Medicine, Hanzeplein 1, 9713 GZ Groningen, The Netherlands. Electronic address: a.m.oosterwijk@pl.hanze.nl.
• Burns. 2019 Dec 1; 45 (8): 1819-1826.

BackgroundDissatisfaction is being voiced with the generally used way joint flexibility problems are defined (operationalised), i.e. as a range of motion (ROM) one or more degrees lower than normative ROM of healthy subjects. Other, specifically more function-related operationalisations have been proposed. The current study evaluated the effect of applying different operationalisations of joint flexibility problems on its prevalence.MethodROM data of 95 joints affected by burns of 23 children were used, and data on 18 functional activities (Burn Outcome Questionnaire (BOQ)). Five methods were used to operationalise joint flexibility problems: (1) ROM below normative ROM, (2) ROM below normative ROM minus 1SD, (3) ROM below normative ROM minus 2SD, (4) ROM below functional ROM, and (5) a score of 2 or more on the Likert Scale (BOQ).ResultsPrevalence of joint flexibility problems on a group level ranged from 13 to 100% depending on the operationalisation used. Per joint and movement direction, prevalence ranged from 40% to 100% (Method 1) and 0% to 80% (Methods 2-4). 18% of the children received '2' on the Likert Scale (Method 5).ConclusionThe operationalisation of joint flexibility problems substantially influences prevalence, both on group and joint level. Changing to a function-related operationalisation seems valuable; however, international consensus is required regarding its adoption.Trial RegistrationThe study is registered in the National Academic Research and Collaborations Information System of the Netherlands (OND1348800).Copyright © 2019 Elsevier Ltd and ISBI. All rights reserved.

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