Inter-observer reproducibility of measurements of range of motion in patients with shoulder pain using a digital inclinometer

BackgroundReproducible measurements of the range of motion are an important prerequisite for the interpretation of study results. The digital inclinometer is considered to be a useful instrument because it is inexpensive and easy to use. No previous study assessed inter-observer reproducibility of range of motion measurements with a digital inclinometer by physical therapists in a large sample of patients.MethodsTwo physical therapists independently measured the passive range of motion of the glenohumeral abduction and the external rotation in 155 patients with shoulder pain. Agreement was quantified by calculation of the mean differences between the observers and the standard deviation (SD) of this difference and the limits of agreement, defined as the mean difference ± 1.96*SD of this difference. Reliability was quantified by means of the intraclass correlation coefficient (ICC).ResultsThe limits of agreement were 0.8 ± 19.6 for glenohumeral abduction and -4.6 ± 18.8 for external rotation (affected side) and quite similar for the contralateral side and the differences between sides. The percentage agreement within 10° for these measurements were 72% and 70% respectively. The ICC ranged from 0.28 to 0.90 (0.83 and 0.90 for the affected side).ConclusionsThe inter-observer agreement was found to be poor. If individual patients are assessed by two different observers, differences in range of motion of less than 20–25 degrees can not be distuinguished from measurement error. In contrast, acceptable reliability was found for the inclinometric measurements of the affected side and the differences between the sides, indicating that the inclimeter can be used in studies in which groups are compared.

• Publication year

  2004

• Venue

  BMC Musculoskeletal Disorders

• Publication date

  2004-06-14

• Fields of study

  Medicine

• Identifiers
  DOI 10.1186/1471-2474-5-18PMID 15196309PMCID 434511
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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