Background The Upper Limb Functional Index (ULFI) is a patient reported outcome measure with sound clinimetric properties and clinical viability for determination of upper limb status and impairment. To date, no validated Turkish version is available.
Objectives The purpose of this study is to cross-culturally adapted the ULFI for Turkish-speaking patients (ULFI-Tk) and determine the psychometric properties of reliability, validity, factor structure in a Turkish population with upper limb problems.
Methods The ULFI English version was culturally adapted and translated into Turkish and back-translated according to established guidelines. Patients (n=l02, 70% female, age 49.1±16.6) with upper limb disorders completed the ULFI-Tk at baseline and day-three for test-retest reliability. The Disability of Arm, Shoulder and Hand (DASH) Turkish version was concurrently completed as a criterion. Additional psychometric properties were determined for internal consistency (Chronbach's α), criterion validity and factor structure.
Results ULFI-Tk demonstrated good internal consistency (α=0,87) and reliability (ICC=0.72,CI=0.58-0.80). Factor analysis demonstrated two factor structures, explaining 31,23% of total variance. Pearson's correlation coefficient (r=0,679;p<0,05) revealed modarete criterion validity between the ULFI and DASH.
Conclusions The ULFI-TK demonstrated a 2 factor 25 item structure and is reliable and valid instrument. The ULFI-Tk consists of simple and easily understood words therefore it may be used to assess upper limb musculoskeletal disorders in Turkish speaking patients.
Badalamente M, Coffelt L, Elfar J, Gaston G, Hammert W, Huang J, Lattanza L, Macdermid J, Merrell G, Netscher D, Panthaki Z, Rafijah G, Trczinski D, Graham B & American Society for Surgery of the Hand Clinical Trials and Outcomes Committee (2013b): Measurement scales in clinical research of the upper extremity, part 2: outcome measures in studies of the hand/wrist and shoulder/elbow. J Hand Surg Am 38, 407-412.
Gabel CP, Michener LA, Melloh M & Burkett B (2010a): Modification of the Upper Limb Functional Index to a Three-point Response Improves Clinimetric Properties. J Hand Ther 23, 41-52
Gabel CP, Burkett B. The Upper Limb Functional Index: Development and Determination of Reliability, Validity, and Responsiveness. J Hand Ther. 2006;19:328–49.
Gabel CP, Yelland M, Melloh M & Burkett B (2010b): A modified QuickDASH-9 provides a valid outcome instrument for upper limb function. BMC Musculoskelet Disord 10, 161.
Disclosure of Interest None declared