Concurrent Validity and Intra-Rater Reliability of Smartphone Application Angle Meter for Shoulder Range of Motion

OBJECTIVE: To evaluate concurrent validity and intra-rater reliability of smartphone application angle meter for shoulder range of motion.METHODOLOGY: An observational cross-sectional study was performed using a non-probability convenient sampling technique to collect data.Data from 37 healthy volunteers was recruited from Riphah Rehabilitation Center Lahore in April-September 2022.Participants aged 18 to 35 who could actively move the Shoulder's dominant side were included in the study.The universal goniometer and the angle meter application measured the active shoulder range of motion.Each movement was performed three times and assessed one by one with a universal goniometer and angle meter application to limit exertion.There was a resting period of 1 day after each movement.Collected data was analyzed with SPSS 20.0.RESULTS: An angle meter app could be a feasible alternative to the goniometer instrument for healthcare practitioners to evaluate active shoulder range of motion.The Cronbach's alpha value was 0.933 for Shoulder Flexion, 0.986 for Shoulder Abduction, 0.994 for Shoulder Internal Rotation, and 0.980 for Shoulder External Rotation.Overall, Cronbach's alpha value portrayed excellent reliability for the Smartphone Angle Meter.Based on the results, it can be stated that the Smartphone Angle Meter app has a high strength to robust positive correlation for the Shoulder range value of <0.001, confirming the statistical significance of the positive relationship.CONCLUSION: According to this study's findings, the Angle meter app was a valid and reliable alternative goniometer tool for assessing active shoulder range of motion in healthy adults.