A rupture of the palmar ligaments of the radiocarpal joint would lead to uncontrolled motion during:

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Question restatement: A rupture of the palmar ligaments of the radiocarpal joint would lead to uncontrolled motion during:

Option 1: Wrist Extension. The palmar (volar) radiocarpal ligaments are primary restraints to dorsal (extension) movement of the distal forearm relative to the carpus. If these ligaments are ruptured, the joint becomes unstable in extension, allowing excessive or uncontrolled extension because the structures that normally limit that motion are damaged.

Option 2: Ulnar Deviation. While some intrinsic stabilizers restrict ulnar deviation, the palmar radiocarpal ligaments are not the principal restraints for this plane of motion. Instability here would more likely involve other ligaments or the ulnar-sided stabilizers rather than a primary loss from palmar radiocarpal rupture.

Option 3: Wrist Flexion. The palmar radiocarpal ligaments actually become taut and restrain extension more than flexion. If they were ruptured, uncontrolled motion would be more expected in extension rather than in flexion, since flexion is resisted by dorsal structures and other intact ligaments. However, the direct consequence of palmar ligament rupture is the loss of restraint to dorsal collapse toward extension.

Option 4: Radial Deviation. Like ulnar deviation, radial deviation is stabilized by several structures including the radiocarpal ligaments, intercarpal ligaments, and radial collateral ligaments. The palmar radiocarpal ligaments are not the sole or primary restraints against radial deviation, so rupture would not specifically yield uncontrolled motion in this plane.

Summary: The palmar radiocarpal ligaments serve as key volar restraints to extension of the radiocarpal joint. Their rupture most directly compromises stability during extension, producing uncontrolled motion in that plane. The other options involve movements that are not primarily governed by the palmar radiocarpal ligament constraints, and thus are less likely to become uncontrolled due to this specific injury.

2261 REHSCI 1200 SEC1010 Lecture Exam 2 - Requires Respondus LockDown Browser

A rupture of the palmar ligaments of the radiocarpal joint would lead to uncontrolled motion during:

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