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--- visual3d:documentation:modeling:segments:upper_arm_and_forearm [2024/06/17 18:17] – created sgranger
+++ visual3d:documentation:modeling:segments:upper_arm_and_forearm [2024/07/17 15:45] (current) – created sgranger
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+====== Upper Arm And Forearm ======
+==== Recommended Posture for the static trial ====
-===== Recommended Posture for the static trial =====
 Defining the segment coordinate system for the humerus is particularly difficult because there are no bony landmarks to assist in determining the glenohumeral joint center, and medial and lateral markers on the epicondyles are close together and often do not represent the axis of rotation of the elbow.
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   * The radius value for the proximal end of the upper arm is half the diameter of the upper arm at the level of the head of the humerus. The radius value for the distal end of the upper arm is half the diameter of the upper arm at the level of the elbow.
-===== I have created a thorax/ab segment and an upper arm segment, but no shoulder joint has been created. =====
+==== I have created a thorax/ab segment and an upper arm segment, but no shoulder joint has been created. ====
 Joints are a "book keeping" object in Visual3D because 6 degree of freedom segments don't have an anatomical joint. **//Joints//** are created to express the location at which the interaction torques and moments are applied between segments.
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 **Note:** For the shoulder, this is sometimes still not sufficient to have shoulder "joints" created. If the distance from head of the humerus to the distal end of the thorax is more than the radius of the distal end of the torso, a joint won't be created. Moving the shoulder towards the midline slightly will often result in the shoulder joint be created.