Interrater reliability for unilateral and bilateral tests to measure the popliteal angle in children and youth with cerebral palsy

Erika Cloodt, Joanna Krasny, Marek Jozwiak, Elisabet Rodby-Bousquet

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Short hamstring muscles can cause several problems for children with cerebral palsy. The results of the clinical measurement of hamstring length are often used in decision-making about treatment of children with cerebral palsy. There are different ways of performing this measurement. The aim of this study was to evaluate the interrater reliability of the unilateral and bilateral measurement of the popliteal angle in children and youth with cerebral palsy. Methods: Two methods for estimating hamstring length using unilateral and bilateral measurements of the popliteal angle were applied in children with cerebral palsy. Both tests were applied bilaterally by two independent examiners on the same day for each child. The intraclass correlation coefficient (ICC) was calculated to evaluate the interrater reliability of both measurements. Seventy young people with cerebral palsy (32 females, 38 males, mean age 10 years 8 months, range 5–22 years) at Gross Motor Function Classification System levels I (n = 17), II (n = 31), III (n = 12) and IV (n = 10) were included. Results: The interrater reliability was good for both measurements. The ICC values were 0.80 on the right and 0.86 on the left for the unilateral popliteal angle, and 0.82 on the right and 0.83 on the left for the bilateral popliteal angle. Conclusions: Both unilateral and bilateral measurement of the popliteal angle is a reliable method for estimating hamstring length in children and youth with cerebral palsy.

Original languageEnglish
Article number275
JournalBMC Musculoskeletal Disorders
Volume22
Issue number1
DOIs
Publication statusPublished - 2021

Subject classification (UKÄ)

  • Orthopedics
  • Pediatrics

Keywords

  • Cerebral palsy
  • Hamstring muscles
  • Physical examination
  • Range of motion
  • Reproducibility of results

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