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Validity of Goniometric Elbow Measurements: Comparative Study with a Radiographic Method

  • Clinical Research
  • Published:
Clinical Orthopaedics and Related Research®

Abstract

Background

A universal goniometer is commonly used to measure the elbow’s ROM and carrying angle; however, some authors question its poor intertester reliability.

Questions/purposes

We (1) assessed the validity of goniometric measurements as compared with radiographic measurements in the evaluation of ROM of the elbow and (2) determined the reliability of both.

Methods

The ROM and carrying angle of 51 healthy subjects (102 elbows) were measured using two methods: with a universal goniometer by one observer three times and on radiographs by two independent examiners. Paired t-test and Pearson’s correlation were used to compare and detect the relationship between mean ROM. The maximal error was calculated according to the Bland and Altman method.

Results

The intraclass correlation coefficients (ICC) ranged from 0.945 to 0.973 for the goniometric measurements and from 0.980 to 0.991 for the radiographic measurements. The two methods correlated when measuring the total ROM in flexion and extension. The maximal errors of the goniometric measurement were 10.3° for extension, 7.0° for flexion, and 6.5° for carrying angle 95% of the time. We observed differences for maximum flexion, maximal extension, and carrying angle between the methods.

Conclusion

Both measurement methods differ but they correlate. When measured with a goniometer, the elbow ROM shows a maximal error of approximately 10°.

Clinical Relevance

The goniometer is a reasonable and simple clinical tool, but for research protocols, we suggest using the radiographic method because of the higher level of precision required.

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Authors and Affiliations

Authors

Corresponding author

Correspondence to Dominique M. Rouleau MD, MSc, FRCSC.

Additional information

Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.

Each author certifies that his or her institution approved the human protocol for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.

This work was performed at the Hôpital du Sacré-Cœur de Montreal, Quebec, Canada.

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Chapleau, J., Canet, F., Petit, Y. et al. Validity of Goniometric Elbow Measurements: Comparative Study with a Radiographic Method . Clin Orthop Relat Res 469, 3134–3140 (2011). https://doi.org/10.1007/s11999-011-1986-8

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  • DOI: https://doi.org/10.1007/s11999-011-1986-8

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