Background: The CKCUES test evaluates the functional performance of the shoulder joint. The CKCUES test scores CKC exercises of the upper limbs to examine shoulder stability. Although the CKCUES test provides quantitative data on functional ability and performance, no study has determined the relationship between CKCUES scores and SA and TB muscle strength.
Objects: The objective of this study is to determine the relationship between the CKCUES test scores and the strength of the SA and TB muscles in the CKCUES and unilateral CKCUES tests. Methods: Sixty-six healthy male volunteers participated in the study. A Smart KEMA strength sensor measured SA and TB muscle strength. Two parallel lines on the floor indicated the initial hand placement to start CKCUES tests. For 15 seconds, the subject raises one hand and reaches over to touch the supporting hand, then returns to the starting position.
Results: The correlation between the CKCUES test scores and the strength of the SA was strong (r = 0.650, p < 0.001), and the TB was moderate (r = 0.438, p < 0.001). The correlation between the unilateral CKCUES test and the strength of the SA of the supporting side was strong (r = 0.605, p < 0.001), and swing side was strong (r = 0.681, p < 0.001). The correlation between the unilateral CKCUES test and the strength of the TB of the supporting side was moderate (r = 0.409, p < 0.001), and swing side was moderate (r = 0.482, p < 0.001).
Conclusion: Our study showed that the CKCUES test had a strong association with isometric strength of SA and moderate association with that of TB. These findings suggest that the CKCUES test can evaluate the function of the SA. Moreover, the unilateral CKCUES test can evaluate unilateral shoulder function.

INTRODUCTION
MATERIALS AND METHODS
    1. Subjects
    2. CKCUES Test and Unilateral CKCUES Test
    3. Measurement of Strength
    4. Statistical Analyses
RESULTS
DISCUSSION
CONCLUSIONS
REFERENCES

• Young-soo Weon(Department of Physical Therapy, The Graduate School, Yonsei University/Kinetic Ergocise Based on Movement Analysis Laboratory)
• Sun-hee Ahn(Kinetic Ergocise Based on Movement Analysis Laboratory/Department of Physical Therapy, College of Health Science, Yonsei University)
• Jun-hee Kim(Kinetic Ergocise Based on Movement Analysis Laboratory/Department of Physical Therapy, College of Health Science, Yonsei University)
• Gyeong-tae Gwak(Department of Physical Therapy, The Graduate School, Yonsei University/Kinetic Ergocise Based on Movement Analysis Laboratory)
• Oh-yun Kwon(Kinetic Ergocise Based on Movement Analysis Laboratory/Department of Physical Therapy, College of Health Science, Yonsei University) Corresponding Author