Open Access Research article

Cross-cultural adaptation and reliability and validity of the Dutch Patient-Rated Tennis Elbow Evaluation (PRTEE-D)

Mathijs van Ark*, Johannes Zwerver, Ronald L Diercks and Inge van den Akker-Scheek

Author Affiliations

University of Groningen, University Medical Center Groningen, Center for Sports Medicine, University Center for Sport, Exercise and Health, P.O. Box 30.001, 9700 RB Groningen, The Netherlands

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BMC Musculoskeletal Disorders 2014, 15:270  doi:10.1186/1471-2474-15-270

Published: 11 August 2014

Abstract

Background

Lateral Epicondylalgia (LE) is a common injury for which no reliable and valid measure exists to determine severity in the Dutch language. The Patient-Rated Tennis Elbow Evaluation (PRTEE) is the first questionnaire specifically designed for LE but in English. The aim of this study was to translate into Dutch and cross-culturally adapt the PRTEE and determine reliability and validity of the PRTEE-D (Dutch version).

Methods

The PRTEE was cross-culturally adapted according to international guidelines. Participants (n = 122) were asked to fill out the PRTEE-D twice with a one week interval to assess test-retest reliability. Internal consistency of the PRTEE-D was determined by calculating Crohnbach’s alphas for the questionnaire and subscales. Intraclass Correlation Coefficients (ICC) were calculated for the overall PRTEE-D score, pain and function subscale and individual questions to determine test-retest reliability. Additionally, the Disabilities for the Arm, Shoulder and Hand questionnaire (DASH) and Visual Analogue Scale (VAS) pain scores were obtained from 30 patients to assess construct validity; Spearman’s correlation coefficients were calculated between the PRTEE-D (subscales) and DASH and VAS-pain scores.

Results

The PRTEE was successfully cross-culturally adapted into Dutch (PRTEE-D). Crohnbach’s alpha for the first assessment of the PRTEE-D was 0.98; Crohnbach’s alpha was 0.93 for the pain subscale and 0.97 for the function subscale. ICC for the PRTEE-D was 0.98; subscales also showed excellent ICC values (pain scale 0.97 and function scale 0.97). A significant moderate correlation exists between PRTEE-D and DASH (0.65) and PRTEE-D and VAS pain (0.68).

Conclusion

The PRTEE was successfully cross-culturally adapted and this study showed that the PRTEE-D is reliable and valid to obtain an indication of severity of LE. An easy-to-use instrument for practitioners is now available and this facilitates comparing Dutch and international research data.

Keywords:
Arm injuries; Tennis elbow; Tendon; Tendinopathy; Lateral epicondylitis; PRTEE; PRFEQ