Edward Roddy1, Sara Muller, Elaine Thomas. 1. Arthritis Research Campaign National Primary Care Centre, Primary Care Sciences, Keele University, Keele, UK. e.roddy@cphc.keele.ac.uk
Abstract
OBJECTIVE: To identify a practical definition of disabling foot pain in older adults for clinical and research use, using the Manchester Foot Pain and Disability Index (FPDI). METHODS: Adults aged > or =50 years registered with three general practices were mailed a two-stage cross-sectional survey. A total of 1342 respondents who reported foot pain in the previous 12 months and completed the FPDI and 58 participants in a test-retest repeatability study were included. RESULTS: Confirmatory factor analysis verified the three-construct FPDI structure (pain intensity, functional limitation and appearance). Internal consistency for the three constructs was good (Cronbach's alpha 0.74, 0.92 and 0.77, respectively). A total of 1320 (98.4%) of those persons with foot pain reported disability (at least one of the 17 FPDI items experienced on at least some days -- Definition A). After restricting this definition to problems experienced on most/every day(s) (Definition B), 996 (74.2%) of those with foot pain reported disability (percentage difference 24.2%; 95% CI 21.9, 26.5%). For each of the three constructs, the prevalence of disability among persons with foot pain was significantly higher under Definition A than under Definition B. Test-retest repeatability for the individual constructs ranged from fair to substantial. Physical function, measured by the SF-36 physical function sub-scale, was poorer in those who reported problems within the function construct compared with those with problems in pain and/or appearance constructs only. CONCLUSION: A practical definition of disabling foot pain [at least one of the 10 FPDI function items experienced on most/every day(s)] is proposed, which appears valid, repeatable and suitable for use in older adults.
OBJECTIVE: To identify a practical definition of disabling foot pain in older adults for clinical and research use, using the Manchester Foot Pain and Disability Index (FPDI). METHODS: Adults aged > or =50 years registered with three general practices were mailed a two-stage cross-sectional survey. A total of 1342 respondents who reported foot pain in the previous 12 months and completed the FPDI and 58 participants in a test-retest repeatability study were included. RESULTS: Confirmatory factor analysis verified the three-construct FPDI structure (pain intensity, functional limitation and appearance). Internal consistency for the three constructs was good (Cronbach's alpha 0.74, 0.92 and 0.77, respectively). A total of 1320 (98.4%) of those persons with foot pain reported disability (at least one of the 17 FPDI items experienced on at least some days -- Definition A). After restricting this definition to problems experienced on most/every day(s) (Definition B), 996 (74.2%) of those with foot pain reported disability (percentage difference 24.2%; 95% CI 21.9, 26.5%). For each of the three constructs, the prevalence of disability among persons with foot pain was significantly higher under Definition A than under Definition B. Test-retest repeatability for the individual constructs ranged from fair to substantial. Physical function, measured by the SF-36 physical function sub-scale, was poorer in those who reported problems within the function construct compared with those with problems in pain and/or appearance constructs only. CONCLUSION: A practical definition of disabling foot pain [at least one of the 10 FPDI function items experienced on most/every day(s)] is proposed, which appears valid, repeatable and suitable for use in older adults.
Authors: Tom P Walsh; John B Arnold; Tiffany K Gill; Angela M Evans; Alison Yaxley; Catherine L Hill; E Michael Shanahan Journal: Rheumatol Int Date: 2017-05-17 Impact factor: 2.631
Authors: Babette C van der Zwaard; Petra Jm Elders; Dirk L Knol; Kees J Gorter; Louis Peeraer; Daniëlle Awm van der Windt; Henriëtte E van der Horst Journal: J Foot Ankle Res Date: 2011-03-31 Impact factor: 2.303
Authors: Christian K Pedersen; Bente Danneskiold-Samsøe; Adam P Garrow; Eva E Wæhrens; Henning Bliddal; Robin Christensen; Else Marie Bartels Journal: Pain Res Treat Date: 2013-03-06