Application of the modified lower extremity functional scale in low back pain

Huey Wen Liang, Wen Hsuan Hou, Kai Shiang Chang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

STUDY DESIGN.: This was a cross-sectional study. OBJECTIVE.: We sought to test the psychometric properties of the modified lower extremity functional scale (LEFS) for low back pain (LBP). SUMMARY OF BACKGROUND DATA.: Low back and lower extremities are anatomically and functionally related, and radiating leg pain is common among patients with LBP. The LEFS is a reliable and valid questionnaire for patients with lower extremity conditions caused by musculoskeletal disorders, although its utility in LBP with or without radiating leg pain has not been tested. METHODS.: We recruited subjects with LBP from physical medicine and rehabilitation outpatient clinics whose age was at least 18 years. The evaluation included demographic data, back pain history, pain intensity by the visual analogue scale, the Roland-Morris Disability Questionnaire, and the modified LEFS, in which "lower limb problem" was substituted with "low back/lower limb problem" in the introductory sentence of the questionnaire. Data from 242 patients were analyzed for the psychometric properties of the modified LEFS, including floor and ceiling effects, internal consistency, test-retest reliability, dimensionality, and construct validity. RESULTS.: The modified LEFS had no floor or ceiling effects, high internal consistency (Cronbach α: 0.94), and good test-retest reliability (intraclass correlation coefficient[2,1]: 0.86). Principal component analysis identified one major factor that had an eigenvalue of 9.9 and explained 49.6% of the total variance. The correlations between the modified LEFS and Roland-Morris Disability Questionnaire was high (Pearson correlation coefficient: -0.71). The modified LEFS also discriminated well between the subgroups of LBP with unilateral leg pain and those with bilateral leg pain. CONCLUSION.: The modified LEFS had satisfactory psychometric properties in patients with LBP and could serve as a supplementary outcome measure to assess their activity limitations.

Original languageEnglish
Pages (from-to)2043-2048
Number of pages6
JournalSpine
Volume38
Issue number23
DOIs
Publication statusPublished - Nov 1 2013

Fingerprint

Low Back Pain
Lower Extremity
Leg
Psychometrics
Pain
Reproducibility of Results
Physical and Rehabilitation Medicine
Pain Measurement
Back Pain
Ambulatory Care Facilities
Principal Component Analysis
Cross-Sectional Studies
Demography
Outcome Assessment (Health Care)

Keywords

  • disability
  • leg pain
  • lowback pain
  • lower extremity functional scale
  • outcome measure
  • questionnaire
  • reliability
  • Roland-Morris Disability Questionnaire
  • sciatica
  • validity

ASJC Scopus subject areas

  • Clinical Neurology
  • Orthopedics and Sports Medicine

Cite this

Application of the modified lower extremity functional scale in low back pain. / Liang, Huey Wen; Hou, Wen Hsuan; Chang, Kai Shiang.

In: Spine, Vol. 38, No. 23, 01.11.2013, p. 2043-2048.

Research output: Contribution to journalArticle

Liang, Huey Wen ; Hou, Wen Hsuan ; Chang, Kai Shiang. / Application of the modified lower extremity functional scale in low back pain. In: Spine. 2013 ; Vol. 38, No. 23. pp. 2043-2048.
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