Fig. 1. Posterolateral view of the left proximal forearm in pronation. (A) The anconeus muscle is divided into 4 parts: proximal transverse segment, middle segment, distal segment and terminal fiber. Measurements are generated from the cadaver specimens to determine values for the length of the borders (superior, lateral and base) and anconeus muscle fiber angle (asterisks) of the middle segment with the sagittal plane of ulna. (B) The articulated skeleton showing the LUCL (blue coloured) measurements. The coalescing point of LUCL ligament with the AL (black point) is considered as a reference point to determine the value of the LUCL length to its proximal (LE) and distal (supinator crest) attachments. The dotted line is the distance from the proximal edge of the cartilage of the radial head to the distal edge of the AL (red coloured). LUCL, lateral ulnar collateral ligament; AL, annular ligament; LE, lateral epicondyle.
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