Menu

Question 141

Topic: Shoulder Pathology

A 28-year-old male presents with a dull ache around his shoulder and noticeable medial scapular winging when performing a wall push-up. Which muscle is denervated, and what is the root origin of the affected nerve?

. Serratus anterior; C5, C6, C7
. Trapezius; Cranial Nerve XI
. Rhomboids; C5
. Latissimus dorsi; C6, C7, C8
. Serratus anterior; C8, T1

Correct Answer & Explanation

. Serratus anterior; C5, C6, C7


Explanation

Medial scapular winging is caused by paralysis of the serratus anterior muscle, which is innervated by the long thoracic nerve. The long thoracic nerve originates from the roots of C5, C6, and C7.

Question 142

Topic: Shoulder Pathology

A 26-year-old woman complains of painful crepitus and snapping at the superomedial border of her scapula with arm movement. Nonoperative measures have failed after 6 months. She is scheduled for surgery. Excision of which of the following bursae is typically performed along with resection of the superomedial angle?

. Subacromial and subdeltoid
. Infraserratus and supraserratus
. Subscapular and subcoracoid
. Trapezoid and conoid
. Olecranon and bicipitoradial

Correct Answer & Explanation

. Infraserratus and supraserratus


Explanation

Snapping scapula syndrome often involves inflammation of the infraserratus and supraserratus bursae. Surgical management includes bursectomy of these spaces and resection of the superomedial angle of the scapula.

Question 143

Topic: Shoulder Pathology

A 32-year-old woman develops prominent medial scapular winging three weeks after a severe viral illness. She has weakness in forward elevation but intact external rotation. EMG confirms an isolated nerve palsy. Which nerve-muscle pair is affected?

. Spinal accessory nerve / Trapezius
. Long thoracic nerve / Serratus anterior
. Dorsal scapular nerve / Rhomboids
. Suprascapular nerve / Supraspinatus
. Thoracodorsal nerve / Latissimus dorsi

Correct Answer & Explanation

. Long thoracic nerve / Serratus anterior


Explanation

Medial scapular winging (prominence of the medial border) is classic for serratus anterior paralysis due to long thoracic nerve palsy. Lateral winging is associated with trapezius paralysis from a spinal accessory nerve injury.

Question 144

Topic: Shoulder Pathology

A 25-year-old male presents with inability to elevate his right arm past 90 degrees and prominent medial winging of his right scapula, which is exacerbated when he pushes against a wall. He recalls a severe viral illness 3 weeks prior. Which nerve is most likely affected?

. Spinal accessory nerve
. Long thoracic nerve
. Suprascapular nerve
. Axillary nerve
. Dorsal scapular nerve

Correct Answer & Explanation

. Long thoracic nerve


Explanation

Medial scapular winging is caused by paralysis of the serratus anterior muscle, which is innervated by the long thoracic nerve. Viral illness or acute brachial neuritis (Parsonage-Turner syndrome) is a common non-traumatic etiology.

Question 145

Topic: Shoulder Pathology

A 28-year-old man sustains a blunt trauma to the posterior triangle of the neck. He presents with an inability to comfortably abduct his arm above 90 degrees and a drooping shoulder. Examination shows prominent lateral scapular winging. Injury to which of the following nerves is the most likely cause?

. Long thoracic nerve
. Suprascapular nerve
. Spinal accessory nerve
. Dorsal scapular nerve
. Axillary nerve

Correct Answer & Explanation

. Spinal accessory nerve


Explanation

The spinal accessory nerve innervates the trapezius muscle. Injury to this nerve leads to a drooping shoulder and lateral scapular winging. Medial scapular winging is caused by serratus anterior paralysis (long thoracic nerve).

Question 146

Topic: Shoulder Pathology

A 45-year-old woman presents with right shoulder weakness following a lymph node biopsy in the posterior triangle of the neck. On examination, the affected scapula is laterally translated and there is a droop of the shoulder. She has difficulty abducting her arm past 90 degrees. Which nerve is injured?

. Long thoracic nerve
. Suprascapular nerve
. Spinal accessory nerve
. Dorsal scapular nerve
. Axillary nerve

Correct Answer & Explanation

. Spinal accessory nerve


Explanation

Spinal accessory nerve (CN XI) injury, often iatrogenic from posterior triangle neck surgery, denervates the trapezius, leading to lateral scapular winging. Long thoracic nerve injury causes medial winging.

Question 147

Topic: Shoulder Pathology

A 35-year-old female presents with aching shoulder pain and fatigue when working overhead. Physical examination demonstrates medial winging of the scapula that is accentuated when she pushes against a wall. Which nerve and corresponding muscle are primarily affected?

. Spinal accessory nerve; Trapezius
. Long thoracic nerve; Serratus anterior
. Dorsal scapular nerve; Rhomboids
. Suprascapular nerve; Supraspinatus
. Thoracodorsal nerve; Latissimus dorsi

Correct Answer & Explanation

. Long thoracic nerve; Serratus anterior


Explanation

Medial winging of the scapula, accentuated by wall push-ups, indicates serratus anterior dysfunction caused by a long thoracic nerve palsy. In contrast, lateral winging is typically associated with spinal accessory nerve and trapezius palsy.

Question 148

Topic: Shoulder Pathology

A patient presents with scapular winging and inability to efficiently retract the scapula. EMG reveals a lesion isolated to the dorsal scapular nerve. Which of the following muscles are primarily affected?

. Serratus anterior
. Latissimus dorsi
. Rhomboid major and levator scapulae
. Supraspinatus and infraspinatus
. Teres major and minor

Correct Answer & Explanation

. Rhomboid major and levator scapulae


Explanation

The dorsal scapular nerve arises from the C5 root of the brachial plexus and innervates the rhomboid major, rhomboid minor, and the levator scapulae. Denervation leads to weakness in scapular retraction and elevation.

Question 149

Topic: Shoulder Pathology

A patient sustains a deep penetrating injury immediately anterior to the anterior scalene muscle in the lower neck. Which of the following structures is most likely injured in this specific location?

. Subclavian artery
. Subclavian vein
. Upper trunk of the brachial plexus
. Middle trunk of the brachial plexus
. Long thoracic nerve

Correct Answer & Explanation

. Subclavian vein


Explanation

The subclavian vein passes anterior to the anterior scalene muscle. In contrast, the subclavian artery and the roots/trunks of the brachial plexus pass through the interscalene triangle, which is located between the anterior and middle scalene muscles.

Question 150

Topic: Shoulder Pathology

A 28-year-old weightlifter presents with right shoulder pain and weakness. On physical examination, the inferior angle of the right scapula is translated laterally and superiorly when the patient pushes against a wall. Which of the following nerves is most likely injured?

. Long thoracic nerve
. Spinal accessory nerve
. Dorsal scapular nerve
. Suprascapular nerve
. Axillary nerve

Correct Answer & Explanation

. Spinal accessory nerve


Explanation

Lateral scapular winging is caused by trapezius muscle paralysis resulting from a spinal accessory nerve injury. Medial winging is caused by serratus anterior paralysis due to a long thoracic nerve injury.

Question 151

Topic: Shoulder Pathology

A 24-year-old male presents with right shoulder pain and weakness after carrying a heavy backpack during a 3-week hike. On exam, he has medial scapular winging when pushing against a wall. Which of the following nerve-muscle combinations is affected?

. Spinal accessory nerve / Trapezius
. Long thoracic nerve / Serratus anterior
. Dorsal scapular nerve / Rhomboids
. Suprascapular nerve / Supraspinatus
. Axillary nerve / Deltoid

Correct Answer & Explanation

. Long thoracic nerve / Serratus anterior


Explanation

Medial scapular winging is caused by paralysis of the serratus anterior, which is innervated by the long thoracic nerve. Trapezius palsy secondary to spinal accessory nerve injury typically causes lateral winging.

Question 152

Topic: Shoulder Pathology

A 35-year-old motorcyclist is involved in a high-speed collision.

He presents with a massive shoulder hematoma, absent radial pulse, and a completely flail extremity. Chest radiograph shows lateral displacement of the scapula. What is the most common neurologic injury associated with this condition?

. Isolated axillary nerve palsy
. Complete brachial plexus avulsion
. Isolated radial nerve palsy
. Long thoracic nerve palsy
. Spinal accessory nerve palsy

Correct Answer & Explanation

. Complete brachial plexus avulsion


Explanation

Scapulothoracic dissociation involves complete disruption of the scapulothoracic articulation. It is a high-energy trauma highly associated with devastating injuries, most commonly a complete brachial plexus avulsion and vascular disruption.

Question 153

Topic: Shoulder Pathology

A 26-year-old female presents with a painful clunking sensation at the superomedial angle of her scapula during arm elevation. Nonoperative management has failed. Which bony structure may need resection to relieve her symptoms?

. Coracoid process
. Acromion
. Superomedial angle of the scapula
. Inferior angle of the scapula
. Clavicle

Correct Answer & Explanation

. Superomedial angle of the scapula


Explanation

Snapping scapula syndrome often involves bursitis or bony abnormalities at the superomedial border of the scapula. If prolonged conservative treatment fails, partial resection of the superomedial angle provides significant relief.

Question 154

Topic: Shoulder Pathology

A 35-year-old woman presents with persistent shoulder pain and weakness 6 months after a posterior triangle cervical lymph node biopsy. Examination reveals lateral winging of the scapula and an inability to actively abduct the arm past 90 degrees. If nonoperative management fails, which tendon transfer procedure is most appropriate?

. Pectoralis major to subscapularis transfer
. Latissimus dorsi to greater tuberosity transfer
. Eden-Lange procedure (transfer of levator scapulae, rhomboid major, and rhomboid minor)
. Split pectoralis major to the long thoracic nerve
. Lower trapezius transfer to the infraspinatus

Correct Answer & Explanation

. Eden-Lange procedure (transfer of levator scapulae, rhomboid major, and rhomboid minor)


Explanation

Lateral winging of the scapula suggests spinal accessory nerve palsy leading to trapezius paralysis, often iatrogenic from posterior triangle neck surgery. The Eden-Lange procedure transfers the levator scapulae and rhomboids to the lateral scapula to replicate trapezius function.

Question 155

Topic: Shoulder Pathology

A 26-year-old man presents with right shoulder pain and weakness 3 weeks after a viral illness. On examination, forward elevation is limited to 90 degrees, and there is prominent medial winging of the scapula when he pushes against a wall.

Which nerve is most likely affected, and what muscle does it innervate?

. Spinal accessory nerve; Trapezius
. Long thoracic nerve; Serratus anterior
. Dorsal scapular nerve; Rhomboids
. Suprascapular nerve; Supraspinatus
. Axillary nerve; Deltoid

Correct Answer & Explanation

. Long thoracic nerve; Serratus anterior


Explanation

Medial winging of the scapula is caused by paralysis of the serratus anterior muscle, which is innervated by the long thoracic nerve. Viral illness can trigger a neuritis (Parsonage-Turner syndrome) causing this palsy.

Question 156

Topic: Shoulder Pathology

A 60-year-old man undergoes a lower trapezius tendon transfer augmented with an Achilles tendon allograft for a massive, irreparable posterosuperior rotator cuff tear.

What nerve supplies the transferred muscle, and what primary motion is restored?

. Thoracodorsal nerve; Internal rotation
. Spinal accessory nerve; External rotation
. Long thoracic nerve; Forward elevation
. Dorsal scapular nerve; Abduction
. Axillary nerve; External rotation

Correct Answer & Explanation

. Spinal accessory nerve; External rotation


Explanation

The lower trapezius transfer is primarily used to restore external rotation in patients with massive, irreparable posterosuperior rotator cuff tears. The trapezius is innervated by the spinal accessory nerve (Cranial Nerve XI).

Question 157

Topic: Shoulder Pathology

A 32-year-old man presents with right shoulder weakness 3 months after a severe viral illness. Examination demonstrates pronounced medial winging of the scapula when he pushes against a wall. EMG confirms a localized nerve injury. If nonoperative management fails after 12 to 18 months, which surgical procedure is most appropriate?

. Eden-Lange procedure
. Split pectoralis major transfer
. Modified Weaver-Dunn procedure
. Latissimus dorsi transfer
. Lower trapezius transfer

Correct Answer & Explanation

. Split pectoralis major transfer


Explanation

Medial winging of the scapula is caused by serratus anterior palsy secondary to long thoracic nerve injury. The split pectoralis major tendon transfer is the procedure of choice for symptomatic, irreversible serratus anterior palsy.

Question 158

Topic: Shoulder Pathology

A 24-year-old carpenter presents with a dull ache in his right shoulder and inability to fully elevate his arm. Examination reveals medial winging of the scapula that worsens when he pushes against a wall. Injury to which nerve is the most likely cause?

. Spinal accessory nerve
. Long thoracic nerve
. Dorsal scapular nerve
. Suprascapular nerve

Correct Answer & Explanation

. Long thoracic nerve


Explanation

Medial winging of the scapula is caused by paralysis of the serratus anterior muscle, which is innervated by the long thoracic nerve. Lateral winging is typically associated with spinal accessory nerve injury (trapezius paralysis).

Question 159

Topic: Shoulder Pathology

A 30-year-old woman presents with medial scapular winging that is accentuated when she pushes against a wall. Which nerve and corresponding muscle are most likely affected?

. Spinal accessory nerve and trapezius
. Long thoracic nerve and serratus anterior
. Dorsal scapular nerve and rhomboids
. Suprascapular nerve and supraspinatus
. Axillary nerve and deltoid

Correct Answer & Explanation

. Long thoracic nerve and serratus anterior


Explanation

Medial scapular winging (where the medial border becomes prominent) is caused by paralysis of the serratus anterior, which is innervated by the long thoracic nerve. Trapezius palsy typically causes lateral winging.

Question 160

Topic: Shoulder Pathology

A 45-year-old woman undergoes a posterior triangle lymph node biopsy. Three weeks later, she complains of a dull ache in her shoulder and an inability to elevate her arm above 90 degrees. Examination shows lateral displacement and downward rotation of the scapula. Which nerve was most likely injured, and what is the primary affected muscle?

. Long thoracic nerve; Serratus anterior
. Spinal accessory nerve; Trapezius
. Dorsal scapular nerve; Rhomboids
. Suprascapular nerve; Supraspinatus
. Axillary nerve; Deltoid

Correct Answer & Explanation

. Spinal accessory nerve; Trapezius


Explanation

Injury to the spinal accessory nerve during posterior cervical triangle surgery denervates the trapezius. This results in lateral winging and downward rotation of the scapula, distinguishing it from the medial winging seen in long thoracic nerve palsy.