Musculocutaneous neuropathy - Revision history

Cole Ettingoff: /* Management */

2025-05-05T23:28:14Z

Management

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	** Physical therapy to maintain joint range of motion and reduce disuse atrophy		** Physical therapy to maintain joint range of motion and reduce disuse atrophy
	*		*
	* In cases of traumatic injury or surgical complication, refer early to neurology or orthopedic surgery		* In cases of traumatic injury or surgical complication, refer early to neurology or orthopedic surgery <ref> Mahan MA, Amrami KK, Spinner RJ. Surgical approach to isolated musculocutaneous nerve injuries. Neurosurg Focus. 2014;36(1):E2. </ref>
	*		*
	* No role for steroids unless part of an inflammatory neuropathy (e.g., Parsonage-Turner syndrome)		* No role for steroids unless part of an inflammatory neuropathy (e.g., Parsonage-Turner syndrome)

Cole Ettingoff: /* Diagnosis */

2025-05-05T23:27:17Z

Diagnosis

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	===Diagnosis===		===Diagnosis===
	Primarily clinical, based on focal motor and sensory deficits in the musculocutaneous distribution. Confirmatory diagnosis is often made with electromyography and nerve conduction studies, which help localize the lesion and exclude more proximal plexus or root pathology.		Primarily clinical, based on focal motor and sensory deficits in the musculocutaneous distribution. Confirmatory diagnosis is often made with electromyography and nerve conduction studies, which help localize the lesion and exclude more proximal plexus or root pathology. <ref> Preston DC, Shapiro BE. Electromyography and Neuromuscular Disorders. 3rd ed. Elsevier; 2013. </ref>

	==Management==		==Management==

Cole Ettingoff: /* Workup */

2025-05-05T23:26:31Z

Workup

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	** Cervical spine imaging (X-ray or MRI) if radicular symptoms or trauma present		** Cervical spine imaging (X-ray or MRI) if radicular symptoms or trauma present
	** Shoulder X-ray if trauma or suspected dislocation		** Shoulder X-ray if trauma or suspected dislocation
	** MRI brachial plexus if concern for plexopathy		** MRI brachial plexus if concern for plexopathy <ref> Ferrante MA. Brachial plexopathies: classification, causes, and consequences. Muscle Nerve. 2004;30(5):547–568 </ref>
	** Electrodiagnostic studies (EMG/NCS)—best for confirming diagnosis, typically performed 2–3 weeks after symptom onset		** Electrodiagnostic studies (EMG/NCS)—best for confirming diagnosis, typically performed 2–3 weeks after symptom onset <ref> Preston DC, Shapiro BE. Electromyography and Neuromuscular Disorders. 3rd ed. Elsevier; 2013. </ref>

	===Diagnosis===		===Diagnosis===

Cole Ettingoff: /* Background */

2025-05-05T23:24:30Z

Background

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	==Background==		==Background==
	Musculocutaneous neuropathy is a rare peripheral nerve injury involving the musculocutaneous nerve, which arises from the lateral cord of the brachial plexus (C5–C7). It provides motor innervation to the biceps brachii, brachialis, and coracobrachialis muscles, and sensory innervation to the lateral forearm via its terminal branch—the lateral antebrachial cutaneous nerve.		Musculocutaneous neuropathy is a rare peripheral nerve injury involving the musculocutaneous nerve, which arises from the lateral cord of the brachial plexus (C5–C7). It provides motor innervation to the biceps brachii, brachialis, and coracobrachialis muscles, and sensory innervation to the lateral forearm via its terminal branch—the lateral antebrachial cutaneous nerve.
	Injury to this nerve may result from direct trauma, shoulder dislocation, surgical complications, or repetitive overhead activity. Recognition in the ED is critical to guide appropriate workup, limit unnecessary imaging, and arrange early neurology or rehabilitation referral when needed.		Injury to this nerve may result from direct trauma, shoulder dislocation, surgical complications, or repetitive overhead activity. Recognition in the ED is critical to guide appropriate workup, limit unnecessary imaging, and arrange early neurology or rehabilitation referral when needed. <ref> 1. Preston DC, Shapiro BE. Electromyography and Neuromuscular Disorders. 3rd ed. Elsevier; 2013. </ref>

	[[File:Brachial plexus 2.png\|thumb]]		[[File:Brachial plexus 2.png\|thumb]]

Cole Ettingoff: /* See Also */

2025-05-05T23:23:12Z

Cole Ettingoff: /* Disposition */

2025-05-05T23:22:02Z

Disposition

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	==Disposition==		==Disposition==
			* Outpatient follow-up is appropriate for stable patients with isolated deficits
			*
			* Refer to neurology for persistent weakness, unclear diagnosis, or if EMG is indicated
			**
			** Urgent imaging or consultation if:
			**
			** Rapid progression of symptoms
			**
			** Suspicion for cervical spine or plexus injury
			**
			** Associated trauma (e.g., fracture, shoulder dislocation)

	==See Also==		==See Also==

Cole Ettingoff: /* Management */

2025-05-05T23:21:15Z

Management

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	==Management==		==Management==
			* Supportive care for most cases:
			** Activity modification (especially avoiding aggravating overhead motions)
			** Pain control (NSAIDs, acetaminophen)
			** Physical therapy to maintain joint range of motion and reduce disuse atrophy
			*
			* In cases of traumatic injury or surgical complication, refer early to neurology or orthopedic surgery
			*
			* No role for steroids unless part of an inflammatory neuropathy (e.g., Parsonage-Turner syndrome)

	==Disposition==		==Disposition==

Cole Ettingoff: /* Evaluation */

2025-05-05T23:20:19Z

Evaluation

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	==Evaluation==		==Evaluation==
	===Workup===		===Workup===
			* Detailed neurologic exam focusing on motor strength (biceps, brachialis), forearm supination, and sensory testing of the lateral forearm
			*
			* Reflex testing (biceps and brachioradialis)
			*
			* Cervical spine exam to assess for radiculopathy
			*
			* Consider:
			** Cervical spine imaging (X-ray or MRI) if radicular symptoms or trauma present
			** Shoulder X-ray if trauma or suspected dislocation
			** MRI brachial plexus if concern for plexopathy
			** Electrodiagnostic studies (EMG/NCS)—best for confirming diagnosis, typically performed 2–3 weeks after symptom onset

	===Diagnosis===		===Diagnosis===
			Primarily clinical, based on focal motor and sensory deficits in the musculocutaneous distribution. Confirmatory diagnosis is often made with electromyography and nerve conduction studies, which help localize the lesion and exclude more proximal plexus or root pathology.

	==Management==		==Management==

Cole Ettingoff: /* Differential Diagnosis */

2025-05-05T23:18:58Z

Differential Diagnosis

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 ==Differential Diagnosis==
+* Cervical radiculopathy (C5–C6)
 ==Evaluation==

Cole Ettingoff: /* Clinical Features */

2025-05-05T23:18:25Z

Clinical Features

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	==Clinical Features==		==Clinical Features==
			Motor deficits:

			* Weakness of elbow flexion (biceps, brachialis)
			*
			* Weakness of forearm supination (biceps)

			Sensory loss:

			* Numbness or paresthesia over the lateral aspect of the forearm
			*
			* Atrophy of the biceps may be seen in delayed or chronic cases

			Reflexes:

			* Biceps reflex may be diminished or absent

			Usually unilateral

	==Differential Diagnosis==		==Differential Diagnosis==

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	==See Also==		==See Also==
			[[Brachial Plexus Injury]]

			[[Radial Nerve Palsy]]

			[[Cervical Radiculopathy]]

			[[Neuralgic Amyotrophy]]

	==External Links==		==External Links==