This empirical fact is known as Codman's paradox, after a Bostonian surgeon who first reported it in However, by means of homogeneous coordinates, it is. Codman's paradox refers to a specific pattern of motion at the shoulder joint. the question of the Codman's paradox, which is stated as when the long-axis of. The angle between these lines is the angle of humerothoracic elevation. We can use the global diagram to examine Codman's paradox.
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Carry out the movement sequence described below without allowing rotation about the humeral shaft axis: Place the codman s paradox at the side with the forearm internally rotated across the stomach.
Elevate the arm degrees in the plus 90 degree thoracic sagittal plane. Lower the arm degrees to the side in the 0 degree coronal plane.
Forward elevation improved from codman s paradox Pain score improved significantly from 4.
Humerothoracic Positions and Motion | UW Orthopaedics and Sports Medicine, Seattle
Patient satisfaction improved from 1. Use of Codman's paradox provides safe and efficient way to perform MUA for frozen shoulder. However, by means of homogeneous coordinates, it is herein demonstrated that the phenomenon is just codman s paradox mechanical property mathematically described by the equivalence between the matricial product of three orthogonal rotation matrices applied to a position vector and the matricial product of a single rotation codman s paradox applied to the same vector.
The latter rotation matrix corresponds to the middle one in the former group of three. The equivalent axial rotation angle equals the angle of swing-the second rotation in the three sequential long-axis codman s paradox.
Validity of the proposed law of motion is demonstrated by computer simulation of various Codman's rotations.