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Related to sigmoid notch: submandibular fossa, malar process
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As the forearm rotates into pronation, there is a dynamic increase in ulnar variance, and the ulnar head translates dorsally within the sigmoid notch.
Post-traumatic degenerative changes can result from the involvement of the sigmoid notch in a distal radius fracture.
1) Though slightly asymmetric to the ulnar head, the sigmoid notch has been shown to contribute approximately 20% of the stability of the DRUJ.
Motion at the DRUJ occurs through the ulna, seated within the sigmoid notch, and the gliding undersurface of the fibrocartilaginous disk of the triangular fibrocartilage complex (TFCC) (Fig.
Ulnar head prosthesis, in conjunction with sigmoid notch resurfacing offers an anatomic solution for the restoration of kinematics and stability for primary DRUJ treatment and salvage.