![]() ![]() ![]() Occasionally, when ruling out or investigating compressive neuropathies, advanced imaging such as magnetic resonance imaging (MRI) can further delineate pathological anatomic determinants.Įlectromyograms or nerve conduction studies (EMG/NCS) can help differentiate nerve versus muscle injury, measuring the speed at which the impulses travel along the nerve. When there is a traumatic injury, radiographs are usually adequate. This is especially relevant after traumatic injuries such as fractures. Injuring the radial nerve distal to the elbow joint can occur from: Any condition or clinical situation in which the patient has improperly created pathologic forces and/or compression in the axilla can potentially affect the radial nerve by way of the brachial plexus. There will also be a sensory loss in the posterior aspect of the forearm, radiating to the radial aspect of the dorsal hand and digits. This is seen commonly with "Saturday night palsy" and improperly using crutches (crutch palsy). There will be a sensory loss in the lateral arm. Thus, this usually presents with a wrist drop on physical examination. If damaged at the axilla, there will be a loss of extension of the forearm, hand, and fingers. ![]() However, when the hand is pronated, the wrist and hand will drop. This is also referred to as "wrist drop.” With the hand supinated, and the extensors aided by gravity, hand function may appear normal. He or she may complain of decreased or absent sensation on the dorsoradial side of their hand and wrist with an inability to extend their wrist, thumb, and fingers. A patient with radial neuropathy may present holding their affected extremity with the ipsilateral (normal) hand. ![]()
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