The interosseous crest of the radius is the sharp medial ridge running along the length of the radial shaft, providing attachment for the interosseous membrane. It faces the corresponding crest of the ulna, and together the two crests define the boundaries of the interosseous membrane across the forearm.
The interosseous crest of the radius is a critical landmark during open reduction and internal fixation of radial shaft fractures, guiding plate placement on the flat lateral surface. Malunion that alters the bow of the radius reduces forearm rotation. The crest is also the lateral boundary of the interosseous space, relevant in forearm compartment syndrome.
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