The interosseous crest of the ulna runs along the lateral surface of the ulnar shaft, mirroring the radial crest across the interosseous space. It provides the medial attachment of the interosseous membrane and separates the anterior and posterior compartments of the forearm.
The interosseous crest of the ulna guides plate placement in ulnar shaft fractures and Monteggia injury repairs. Accurate restoration of the ulnar bow and crest alignment is essential for restoring forearm rotation. The crest is involved in periosteal stripping during comminuted shaft fractures.
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