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Development and validation of a questionnaire to measure the severity of functional limitations and reduction of sports ability in German-speaking patients with exercise-induced leg pain
  1. Tanja Nauck1,
  2. Heinz Lohrer1,
  3. Nat Padhiar2,
  4. John B King2
  1. 1Department of Orthopaedics, Institute for Sports Medicine, Frankfurt, Hessen, Germany
  2. 2John King Centre for Leg Pain, London Independent Hospital, London, UK
  1. Correspondence to Tanja Nauck, Department of Orthopaedics, Institute for Sports Medicine, Otto-Fleck-Schneise 10, Frankfurt am Main, Hessen 60528, Germany; nauck{at}smi-frankfurt.de

Abstract

Background Currently, there is no generally agreed measure available to quantify a subject's perceived severity of exercise-induced leg pain symptoms. The aim of this study was to develop and validate a questionnaire that measures the severity of symptoms that impact on function and sports ability in patients with exercise-induced leg pain.

Methods The exercise-induced leg pain questionnaire for German-speaking patients (EILP-G) was developed in five steps: (1) initial item generation, (2) item reduction, (3) pretesting, (4) expert meeting and (5) validation. The resulting EILP-G was tested for reliability, validity and internal consistency in 20 patients with exercise-induced leg pain, 20 asymptomatic track and field athletes serving as a population at risk and 33 asymptomatic sport students.

Results The patient group scored the EILP-G questionnaire significantly lower than both control groups (each p<0.001). Test–retest demonstrates an excellent reliability in all tested groups (Intraclass Correlation Coefficient, ICC=0.861–0.987). Concurrent validity of the EILP-G questionnaire showed a substantial agreement when correlated with the chronic exertional compartment syndrome classification system of Schepsis (r=−0.743; p<0.001). Internal consistency for the EILP-G questionnaire was 0.924.

Conclusions EILP-G questionnaire is a valid and reliable self-administered and disease-related outcome tool to measure the severity of symptoms that impact on function and sports ability in patients with exercise-induced leg pain. It can be recommended as a robust tool for measuring the subjectively perceived severity in German-speaking patients with exercise-induced leg pain.

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