الفهرس 
Validity and reliability of rebee wearable sensor to measure knee joint range motion
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Abstract
Background: Range of Motion (ROM) of the joint is one of the elements that affect musculoskeletal system function. A valid and reliable method should be used to measure and record the ROM measurements. It is deemed to be a necessary component specially for lower limb examination. Purpose: This study was conducted to test the concurrent validity and the intra-rater reliability of rebee wearable sensor in measuring Active Range of Motion (AROM) of knee joint flexion and extension compared with the valid digital goniometer in measurement of the AROM of the knee joint. Methods: Forty normal participant’s age ranged from 30 to 45 years and their Body Mass Index (BMI) from 19 to 25 kg/m2 involved in one group. The Digital goniometer and rebee wearable sensor were utilized to measure AROM of knee joint flexion and extension to test the concurrent validity of rebee sensor. The measurement of AROM of knee joint with rebee sensor was repeated two times with one week interval between two measurements by the same observer to test the intrarater reliability of rebee sensor in measuring AROM of knee joint. Results: showed that measurement of AROM of the knee joint flexion with rebee wearable sensor was significantly correlated with the measurement of digital goniometer for AROM of knee joint Flexion (p-value=0.001). The correlation between the two measurements for AROM of knee joint flexion was very good. The intra-rater reliability using the Intra-class Correlation Coefficient (ICC) showed that there was a high reliability of rebee wearable sensor in measurement the AROM of knee joint Flexion with ICC=0.816 and p-value=0.0001, but there was a low reliability of rebee wearable sensor in measurement the AROM of knee joint Extension with ICC=0.409 and p-value=0.004 when compared with measurements for AROM of knee joint using digital goniometer. Conclusions: Rebee wearable sensor is a valid instrument for measurement of AROM of knee joint flexion, but not valid for measurement of AROM of knee joint extension. Regarding reliability rebee wearable sensor has high reliability of measurement of AROM of knee joint flexion, but low reliability for measurement of AROM of knee joint extension.