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Abstract
[...]we want to focus on some mathematics behind the three-dimensional rotations and their compositions. [...]we hope to show that there is no paradox about Codman's rotations and the phenomenon is not merely a property of human shoulder motion. Codman's rotations are performed by such simultaneous action of the shoulder as a whole. [...]the spherical quality demonstrated by phenomenon of Codman's rotations does not really indicate anything about any of shoulder's anatomical components in particular.5 Possible use of Codman's rotations We have shown that the axial rotation that remains after performing the three Codman's rotations is the very same transformation as the second Codman's rotation called swing (RII in our mathematical reasoning). [...]the great attention should yet be given to design of diagnostics procedures utilizing the Codman's rotations.6 Technical issues A simple software tool has been created to demonstrate and understand the idea of Codman's rotations as well as to verify the mathematical reasoning.