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kinematic_model [2023/08/07 00:04] – [Scapula motion] oliver | kinematic_model [2023/08/07 00:05] (current) – [Classical SHR ratio] oliver | ||
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For this RoM the maximum error should be less than 8 degrees in all cases. That is higher than for the other upper extremity joint angles but it sounds worse than it is because typical daily life arm movements have variabilities in the same order. There are several publication about accuracy, e.g.: | For this RoM the maximum error should be less than 8 degrees in all cases. That is higher than for the other upper extremity joint angles but it sounds worse than it is because typical daily life arm movements have variabilities in the same order. There are several publication about accuracy, e.g.: | ||
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==== Angles ==== | ==== Angles ==== | ||
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Typically the SHR is given as the ratio of the glenohumeral abduction angle and the scapula medio-lateral rotation angle during humeral abduction movements (movement mainly in frontal or scapula plane). In many publications, | Typically the SHR is given as the ratio of the glenohumeral abduction angle and the scapula medio-lateral rotation angle during humeral abduction movements (movement mainly in frontal or scapula plane). In many publications, | ||
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Typically the SHR ratio is presented as a function of the humeral elevation. | Typically the SHR ratio is presented as a function of the humeral elevation. | ||
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elevation. | elevation. | ||
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This is a different measure, which results in different numerical values, for the so called SHR ratio but it is robust against angle-offsets. A numerical feature of this definition is, that it can be implemented a way that the measure does not depend on the rotation order of the cardan angles. | This is a different measure, which results in different numerical values, for the so called SHR ratio but it is robust against angle-offsets. A numerical feature of this definition is, that it can be implemented a way that the measure does not depend on the rotation order of the cardan angles. |