Assessment of Interrater and Intrarater Reliability of Cervical Range of Motion (CROM) Goniometer

Purpose. The current study was designed to assess interrater and intrarater validity of cervical range of motion measurements performed with a CROM goniometer. Material and Methods. The study involved 95 healthy university students (31 males and 64 females) aged 20-24 years. Two examiners performed measurements of cervical range of motion using a CROM goniometer. The same subjects were examined again after two weeks, in the same conditions. The results acquired by one rater during the first and the second examination were compared for reproducibility, while the results obtained by the two examiners were compared to assess validity and reliability of the tool. Cronbach’s alpha was applied to determine intrarater reliability, and the values of correlations were used to assess the interrater agreement. Results. Analysis of the results showed both intrarater and interrater agreement in all the measures of cervical range of motion. The highest intrarater and interrater concordance was observed in the measure of extension. Intrarater agreement for Examiner 1 was reflected by Cronbach’s alpha=0.85, and for Examiner 2 by Cronbach’s alpha=0.89. As for the interrater agreement in the measure of extension, the value of correlation in both the first and the second measurement amounted to r=0.89. Conclusions. Measurements performed with the CROM goniometer show interrater and intrarater agreement in assessments of cervical range of motion. The CROM goniometer can be recommended for use in daily clinical practice.