[Purpose] The purpose of this study was to examine the reliability and validity of the
Closed Kinetic Chain Upper Extremity Stability (CKCUES) test. [Subjects and Methods] A
sample of 40 subjects (20 males, 20 females) with and without pain in the upper limbs was
recruited. The subjects were tested twice, three days apart to assess the reliability of
the CKCUES test. The CKCUES test was performed four times, and the average was calculated
using the data of the last 3 tests. In order to test the validity of the CKCUES test, peak
torque of internal/external shoulder rotation was measured using an isokinetic
dynamometer, and maximum grip strength was measured using a hand dynamometer, and their
Pearson correlation coefficients with the average values of the CKCUES test were
calculated. [Results] The reliability of the CKCUES test was very high (ICC=0.97). The
correlations between the CKCUES test and maximum grip strength (r=0.78–0.79), and the peak
torque of internal/external shoulder rotation (r=0.87–0.94) were high indicating its
validity. [Conclusion] The reliability and validity of the CKCUES test were high. The
CKCUES test is expected to be used for clinical tests on upper limb stability at low
price.