TEOT Ortopedia Practice Questions - TEOT - Título De Especialista Em Ortopedia E Traumatologia (Sociedade Brasileira De Ortopedia E Traumatologia AMB) Exam

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A 45-year-old woman sustains a displaced intra-articular distal radius fracture after falling on an outstretched hand. Radiographs demonstrate a comminuted fracture involving both the radiocarpal and distal radioulnar joints with 4 mm of intra-articular step-off, 25° of dorsal tilt, and 5 mm of radial shortening (AO/OTA 23-C3). Which anatomical structure serves as the primary landmark for placing a volar locking plate distal to the watershed line to prevent flexor pollicis longus (FPL) tendon rupture?

The pronator quadratus ridge and the volar rim watershed line, ensuring the plate remains proximal to the transverse volar prominence. The Lister tubercle on the volar cortex of the distal radius. The insertions of the superficial and deep heads of the pronator teres muscle. The dorsal tubercle of the distal radioulnar joint capsule.

Correct Answer:

The pronator quadratus ridge and the volar rim watershed line, ensuring the plate remains proximal to the transverse volar prominence.

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