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Fig. 4 | BMC Musculoskeletal Disorders

Fig. 4

From: The dynamic rotation axis of ulnohumeral joint during active flexion-extension: an in vivo 4-dimensional computed tomography analysis

Fig. 4

The coordinate system of the humerus. The original point is the projection of the center of the medial aspect humerus. X axis: connecting the centers of the medial and lateral aspect of the humerus toward laterally. Y axis: parallel to the longitudinal axis of the humerus toward superiorly. Z axis: perpendicular to the x- and z-axes toward posteriorly

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