Which of the following groups of soft tissue structures could potentially limit full forearm supination?
a. Oblique cord, quadrate ligament, distal palmar radioulnar ligament
b. Lateral collateral ligament, oblique cord, distal anterior radioulnar ligament
c. Quadrate ligament, distal posterior radioulnar ligament, oblique cord
d. Distal posterior radioulnar ligament, interosseous membrane, oblique cord
ANS: A
The quadrate ligament limits the spin of the radial head in the radial notch, and the distal palmar radioulnar ligament becomes taut in full supination. The role of the oblique cord is not well understood, but based on its attachments just below the radial notch and just below the biceps tuberosity, the oblique cord would become taut during supination and therefore could limit motion in that direction
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