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. Author manuscript; available in PMC: 2014 Feb 1.

Published in final edited form as: Clin Biomech (Bristol). 2012 Dec 6;28(2):157–163. doi: 10.1016/j.clinbiomech.2012.11.004

A) Slice at the hook of hamate level. The flexor digitorum profundus tendons are bundled close to the hamate and capitate bones. B) Coordinate system of the hand/forearm using the hook of hamate as the origin. The Z-axis was aligned with the longitudinal axis of the forearm with the proximal to distal direction being positive. The Y-axis was orientated in the anterior to posterior (positive) direction and the X-axis was oriented in the lateral to medial (positive) direction. C) Schematic of the computation of the ellipse area of the four FDP tendons. The major axis, a, corresponded to the maximum and minimum location of the tendons in the x-direction (medial-lateral). The minor axis, b, corresponded to the maximum and minimum location of the tendons in the y-direction (anterior-posterior).

A) Slice at the hook of hamate level. The flexor digitorum profundus tendons are bundled close to the hamate and capitate bones. B) Coordinate system of the hand/forearm using the hook of hamate as the origin. The Z-axis was aligned with the longitudinal axis of the forearm with the proximal to distal direction being positive. The Y-axis was orientated in the anterior to posterior (positive) direction and the X-axis was oriented in the lateral to medial (positive) direction. C) Schematic of the computation of the ellipse area of the four FDP tendons. The major axis, a, corresponded to the maximum and minimum location of the tendons in the x-direction (medial-lateral). The minor axis, b, corresponded to the maximum and minimum location of the tendons in the y-direction (anterior-posterior).