Menu

Upper Extremity Trauma MCQs

Practice Set 22 of 24

This practice set contains high-yield board review questions covering key concepts in Upper Extremity Trauma. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.

Question 421

Topic: Upper Extremity Trauma

A 19-year-old collegiate baseball pitcher undergoes an ulnar collateral ligament (UCL) reconstruction. The anterior bundle of the UCL is the primary restraint to valgus stress. What are the true anatomical attachments of the anterior bundle of the UCL?

. Anteroinferior medial epicondyle to the sublime tubercle of the ulna
. Posterior medial epicondyle to the olecranon process
. Lateral epicondyle to the annular ligament
. Anterior medial epicondyle to the base of the coronoid process
. Medial epicondyle to the radial tuberosity

Correct Answer & Explanation

. Anteroinferior medial epicondyle to the sublime tubercle of the ulna

Explanation

The anterior bundle of the UCL is the primary static restraint to valgus stress at the elbow between 20 and 120 degrees of flexion. It originates on the anteroinferior surface of the medial epicondyle and inserts on the sublime tubercle, which is located on the medial aspect of the coronoid process of the ulna.

Question 422

Topic: Upper Extremity Trauma

A 24-year-old professional baseball pitcher complains of posteromedial elbow pain occurring specifically during the deceleration phase of throwing. He lacks 15 degrees of terminal extension. Radiographs demonstrate posteromedial olecranon osteophytes. Which of the following is the most likely underlying biomechanical etiology for this condition?

. Ulnar collateral ligament (UCL) insufficiency
. Lateral ulnar collateral ligament (LUCL) deficiency
. Flexor-pronator mass tendinosis
. Radiocapitellar chondromalacia
. Triceps tendon tightness

Correct Answer & Explanation

. Ulnar collateral ligament (UCL) insufficiency

Explanation

The scenario describes Valgus Extension Overload syndrome, commonly seen in overhead throwing athletes. The underlying etiology is typically chronic attenuation or insufficiency of the anterior bundle of the UCL. This microinstability allows excessive valgus stress during the throwing motion, leading the olecranon to impinge against the posteromedial wall of the olecranon fossa, ultimately causing reactive osteophyte formation.

Question 423

Topic: Upper Extremity Trauma

A 29-year-old mountain biker suffers a Type V acromioclavicular (AC) joint separation and is scheduled for a coracoclavicular (CC) ligament reconstruction. To properly recreate the native biomechanics, the surgeon must understand the orientation of the conoid and trapezoid ligaments. Which of the following describes the anatomic position of the conoid ligament relative to the trapezoid ligament?

. Anterior and lateral
. Anterior and medial
. Posterior and lateral
. Posterior and medial
. Directly superficial

Correct Answer & Explanation

. Anterior and lateral

Explanation

The coracoclavicular ligaments consist of the conoid and trapezoid. The conoid ligament is located medial and posterior to the trapezoid ligament and provides primary restraint to superior clavicular translation.

Question 424

Topic: Upper Extremity Trauma

An asymptomatic 40-year-old female has an incidental finding of a well-circumscribed cartilaginous lesion in the proximal humerus with punctate calcifications. There is no endosteal scalloping or periosteal reaction. Which of the following is the most appropriate management?

. Wide surgical excision
. Intralesional curettage and grafting
. Neoadjuvant chemotherapy
. Observation with serial radiographs
. Prophylactic internal fixation

Correct Answer & Explanation

. Wide surgical excision

Explanation

This is a classic presentation of an asymptomatic enchondroma. Without signs of aggressive behavior (e.g., deep endosteal scalloping >2/3, rest pain, cortical breakthrough), the standard of care is observation with serial imaging.

Question 425

Topic: Upper Extremity Trauma

Surgical reconstruction of a chronic Type V acromioclavicular (AC) joint separation requires addressing the coracoclavicular (CC) ligaments to restore biomechanical stability. Which of the following statements regarding the native CC ligaments is correct?

. The conoid ligament attaches laterally and provides primary restraint to anterior translation.
. The trapezoid ligament attaches medially and provides primary restraint to superior translation.
. The conoid ligament is posteromedial and is the primary restraint to superior displacement of the clavicle.
. The trapezoid ligament is posteromedial and primarily resists posterior displacement.
. Both ligaments blend seamlessly with the coracoacromial ligament at their superior insertion.

Correct Answer & Explanation

. The conoid ligament is posteromedial and is the primary restraint to superior displacement of the clavicle.

Explanation

The coracoclavicular (CC) ligaments consist of the conoid and trapezoid. The conoid ligament is located posteromedial to the trapezoid and acts as the primary restraint to superior translation of the clavicle. The trapezoid is located anterolateral and is the primary restraint to axial compression of the shoulder.

Question 426

Topic: Upper Extremity Trauma

The coracoclavicular (CC) ligaments provide the primary vertical stability to the acromioclavicular (AC) joint. Which of the following best describes the anatomical location and primary biomechanical role of the conoid ligament?

. It attaches lateral to the trapezoid ligament and resists anterior translation of the clavicle.
. It attaches medial to the trapezoid ligament and provides primary resistance to superior translation of the clavicle.
. It attaches lateral to the trapezoid ligament and provides primary resistance to superior translation of the clavicle.
. It attaches medial to the trapezoid ligament and resists posterior translation of the clavicle.
. It attaches directly to the acromion and resists inferior translation of the clavicle.

Correct Answer & Explanation

. It attaches lateral to the trapezoid ligament and provides primary resistance to superior translation of the clavicle.

Explanation

The coracoclavicular (CC) complex consists of the conoid and trapezoid ligaments. Anatomically, the conoid ligament is positioned posteromedial to the trapezoid ligament. Biomechanically, the conoid ligament is the primary restraint to superior translation of the clavicle relative to the acromion. The trapezoid ligament, located anterolaterally, acts primarily to resist axial compression (posterior translation of the clavicle toward the acromion).

Question 427

Topic: Upper Extremity Trauma
A 27-year-old cyclist falls directly onto his shoulder and is diagnosed with a Type III acromioclavicular (AC) joint separation. If surgical reconstruction is chosen, biomechanical restoration of the coracoclavicular ligaments is crucial. Which of the following describes the correct anatomic relationship and primary function of these ligaments?
. The conoid is medial and resists anterior translation; the trapezoid is lateral and resists superior translation.
. The conoid is medial and resists superior translation; the trapezoid is lateral and resists anterior translation.
. The conoid is lateral and resists superior translation; the trapezoid is medial and resists anterior translation.
. The conoid is lateral and resists anterior translation; the trapezoid is medial and resists superior translation.
. Both ligaments primarily resist posterior translation of the clavicle.

Correct Answer & Explanation

. The conoid is medial and resists superior translation; the trapezoid is lateral and resists anterior translation.

Explanation

The coracoclavicular (CC) ligaments consist of the medial conoid and the lateral trapezoid. The conoid primarily resists superior displacement of the clavicle, while the trapezoid mainly resists anterior-posterior horizontal displacement.

Question 428

Topic: Upper Extremity Trauma

A 22-year-old collegiate baseball pitcher is undergoing ulnar collateral ligament (UCL) reconstruction. Which specific component of the UCL is the primary restraint to valgus stress during the late cocking phase of throwing, and what are its correct anatomical attachments?

. Posterior bundle; medial epicondyle to the olecranon
. Anterior band of the anterior bundle; medial epicondyle to the sublime tubercle
. Posterior band of the anterior bundle; medial epicondyle to the sublime tubercle
. Transverse bundle; olecranon to the coronoid
. Anterior band of the anterior bundle; lateral epicondyle to the radial neck

Correct Answer & Explanation

. Anterior band of the anterior bundle; medial epicondyle to the sublime tubercle

Explanation

The anterior band of the anterior bundle of the UCL is the primary restraint to valgus stress between 30 and 120 degrees of flexion. It originates on the anterior undersurface of the medial epicondyle and inserts on the sublime tubercle of the ulna.

Question 429

Topic: Upper Extremity Trauma

A 30-year-old cyclist sustains an acute Type V acromioclavicular (AC) joint dislocation and undergoes anatomical reconstruction using a free tendon graft. To accurately recreate the native coracoclavicular (CC) ligaments, what is the correct orientation of the clavicular bone tunnels?

. Conoid tunnel is posteromedial; Trapezoid tunnel is anterolateral
. Conoid tunnel is anteromedial; Trapezoid tunnel is posterolateral
. Conoid tunnel is anterolateral; Trapezoid tunnel is posteromedial
. Both tunnels are placed directly midline on the clavicle along the anterior-posterior axis
. Conoid tunnel is lateral; Trapezoid tunnel is medial

Correct Answer & Explanation

. Conoid tunnel is posteromedial; Trapezoid tunnel is anterolateral

Explanation

The native conoid ligament inserts on the posteromedial aspect of the distal clavicle, while the trapezoid ligament inserts more anterolaterally. Anatomical reconstruction techniques mirror this native footprint orientation to optimize biomechanical stability.

Question 430

Topic: Upper Extremity Trauma
A 25-year-old mountain biker falls directly onto the point of his shoulder. Radiographs demonstrate superior displacement of the distal clavicle by 150% relative to the acromion, with a significantly widened coracoclavicular interval. Based on the Rockwood classification, which ligaments are ruptured in this injury?
. Acromioclavicular (AC) ligaments only
. Coracoclavicular (CC) ligaments only
. Both AC and CC ligaments
. AC, CC, and coracoacromial (CA) ligaments
. Coracohumeral ligament only

Correct Answer & Explanation

. Both AC and CC ligaments

Explanation

This is a Rockwood Type III (or higher, depending on posterior/superior displacement magnitude) acromioclavicular joint injury. Type I is a sprain of the AC ligaments. Type II involves ruptured AC ligaments but intact CC ligaments. Type III and above involve rupture of both the AC and CC ligaments.

Question 431

Topic: Upper Extremity Trauma

A 30-year-old male sustains a severe acromioclavicular (AC) joint injury. Radiographs show 200% superior displacement of the clavicle relative to the acromion. During CC ligament reconstruction, the surgeon targets the anatomic footprint of the conoid ligament. Where is this footprint located on the clavicle?

. Anterior-lateral, approximately 15 mm medial to the distal clavicle
. Posterior-medial, approximately 45 mm medial to the distal clavicle
. Anterior-medial, approximately 25 mm medial to the distal clavicle
. Posterior-medial, approximately 30 mm medial to the distal clavicle
. Anterior-lateral, approximately 30 mm medial to the distal clavicle

Correct Answer & Explanation

. Posterior-medial, approximately 45 mm medial to the distal clavicle

Explanation

The conoid ligament is the more medial and posterior of the coracoclavicular ligaments, attaching to the conoid tubercle about 45 mm medial to the distal end of the clavicle. The trapezoid ligament attaches more anteriorly and laterally, around 25 mm from the distal clavicle.

Question 432

Topic: Upper Extremity Trauma

A 45-year-old male sustains an acromioclavicular (AC) joint injury. Radiographs reveal a 150% superior displacement of the clavicle relative to the acromion. During an anatomic coracoclavicular (CC) ligament reconstruction, where should the conoid and trapezoid ligaments be reconstructed relative to each other on the clavicle?

. Conoid is lateral and anterior; Trapezoid is medial and posterior
. Conoid is medial and posterior; Trapezoid is lateral and anterior
. Conoid is directly superior; Trapezoid is directly inferior
. Both are attached to the exact same point on the clavicular shaft
. Conoid is medial and anterior; Trapezoid is lateral and posterior

Correct Answer & Explanation

. Conoid is medial and posterior; Trapezoid is lateral and anterior

Explanation

The conoid ligament attaches to the conoid tubercle, which is located medially and posteriorly on the undersurface of the clavicle. The trapezoid ligament attaches more laterally and anteriorly. The conoid is the primary restraint to superior translation.

Question 433

Topic: Upper Extremity Trauma

A 42-year-old construction worker sustains a severe direct blow to the superior aspect of his shoulder, resulting in an unstable, completely displaced Type V acromioclavicular (AC) joint separation. The surgeon plans an anatomic reconstruction of the coracoclavicular (CC) ligaments. What is the correct anatomical orientation of the native CC ligaments?

. The conoid is located lateral and anterior to the trapezoid
. The conoid is located medial and posterior to the trapezoid
. The trapezoid is located medial and anterior to the conoid
. The trapezoid is located medial and posterior to the conoid
. Both ligaments share a conjoint insertion at the medial border of the acromion

Correct Answer & Explanation

. The conoid is located medial and posterior to the trapezoid

Explanation

The coracoclavicular (CC) ligaments consist of the conoid and trapezoid ligaments. The conoid ligament is cone-shaped and inserts on the conoid tubercle of the clavicle, which is located more medial and posterior (approximately 45 mm from the distal clavicle). The trapezoid ligament is broad and inserts on the trapezoid line of the clavicle, located more lateral and anterior (approximately 25 mm from the distal clavicle).

Question 434

Topic: Upper Extremity Trauma

What is the primary underlying biomechanical cause of posteromedial impingement (valgus extension overload syndrome) in the elbow of a throwing athlete?

. Attenuation of the lateral ulnar collateral ligament
. Contracture of the posterior band of the medial UCL
. Chronic attenuation of the anterior band of the medial UCL
. Hypertrophy of the anconeus muscle
. Radiocapitellar overload due to lateral compartment laxity

Correct Answer & Explanation

. Chronic attenuation of the anterior band of the medial UCL

Explanation

Valgus extension overload in throwers is primarily driven by chronic repetitive microtrauma leading to attenuation of the anterior band of the medial ulnar collateral ligament (UCL). This valgus laxity allows excessive abnormal shear forces on the posteromedial olecranon during the deceleration and follow-through phases, causing osteophyte formation and impingement.

Question 435

Topic: Upper Extremity Trauma

Regarding the coracoclavicular (CC) ligaments in the setting of an acromioclavicular (AC) joint reconstruction, which of the following statements is true regarding their anatomic orientation and biomechanical function?

. The conoid is lateral and resists anterior-posterior translation
. The trapezoid is medial and resists superior translation
. The conoid is medial and acts as the primary restraint to superior translation
. The trapezoid is the primary restraint to superior translation
. Both ligaments insert on the anterior border of the clavicle

Correct Answer & Explanation

. The conoid is medial and acts as the primary restraint to superior translation

Explanation

The coracoclavicular (CC) ligaments consist of the conoid and trapezoid. The conoid is located medial and posterior and is the primary restraint to superior translation of the clavicle. The trapezoid is lateral and anterior, and serves as the primary restraint against axial compression and anterior-posterior translation.

Question 436

Topic: Upper Extremity Trauma
A 25-year-old sustains a Type III acromioclavicular (AC) joint separation. Biomechanically, which ligamentous complex serves as the primary restraint to superior translation of the distal clavicle?
. Acromioclavicular ligaments
. Coracoacromial ligament
. Coracoclavicular ligaments
. Coracohumeral ligament
. Superior glenohumeral ligament

Correct Answer & Explanation

. Coracoclavicular ligaments

Explanation

The coracoclavicular (CC) ligaments (conoid and trapezoid) are the primary static restraints to superior and inferior translation of the clavicle. The acromioclavicular ligaments primarily control horizontal (anteroposterior) stability.

Question 437

Topic: Upper Extremity Trauma

Following arthroscopic debridement for elbow osteoarthritis, a patient is noted to have persistent pain at terminal flexion. Which anatomical structure is most likely the source of this persistent pain?

. Olecranon osteophytes
. Posterior capsule scarring
. Radiocapitellar osteophytes
. Coronoid osteophytes and anterior capsular contracture
. Medial collateral ligament impingement

Correct Answer & Explanation

. Coronoid osteophytes and anterior capsular contracture

Explanation

Pain at terminal flexion is typically caused by anterior impingement. This is most commonly due to osteophytes on the coronoid process (anterior olecranon) impinging against the coronoid fossa of the humerus, or an anterior capsular contracture limiting full flexion. Olecranon osteophytes and posterior capsule scarring primarily limit extension (posterior impingement). Radiocapitellar osteophytes primarily affect pronation/supination and sometimes flexion/extension. Medial collateral ligament impingement is rare in isolated OA and more associated with valgus instability.

Question 438

Topic: Upper Extremity Trauma

A 55-year-old male with a history of recurrent gout presents with acute, severe pain and swelling over the posterior aspect of his right elbow. Examination reveals a tense, erythematous, exquisitely tender swelling overlying the olecranon. He is afebrile. Aspirate of the bursa reveals cloudy fluid with uric acid crystals. What is the most appropriate initial treatment?

. Surgical bursectomy
. Oral antibiotics
. Corticosteroid injection into the bursa
. NSAIDs, rest, and cold compresses
. Intravenous antibiotics and surgical debridement

Correct Answer & Explanation

. Corticosteroid injection into the bursa

Explanation

This patient presents with acute olecranon bursitis secondary to gout. While surgical bursectomy is an option for chronic/recurrent cases or septic bursitis unresponsive to other measures, an acute, non-septic gouty flare in the bursa can be effectively treated with aspiration and a corticosteroid injection. This reduces inflammation and provides significant pain relief. Oral antibiotics are indicated for septic bursitis (which this is not, given uric acid crystals and afebrile status). NSAIDs, rest, and cold compresses are conservative measures that may help but are often insufficient for severe gouty flares. Intravenous antibiotics and surgical debridement are for severe septic bursitis.

Question 439

Topic: Upper Extremity Trauma

For a patient presenting with suspected acromioclavicular (AC) joint injury, which plain radiograph view is essential, in addition to standard AP views, to accurately assess the degree of horizontal instability?

. Axillary lateral view.
. Scapular Y view.
. Zanca view (AP with 10-15 degrees cephalic tilt).
. Stress views with weights.
. Axial view of the clavicle.

Correct Answer & Explanation

. Stress views with weights.

Explanation

Stress views with weights (typically 10-15 lbs held in each hand) are crucial for assessing the integrity of the coracoclavicular ligaments and the degree of vertical instability in AC joint injuries. While the Zanca view optimizes AC joint visualization, it doesn't dynamically assess stability. The question asks about horizontal stability, which is typically assessed clinically or with specific axial views, but stress views are paramount for vertical instability, which often dictates management.

Question 440

Topic: Upper Extremity Trauma
When discussing surgical options for chronic, symptomatic acromioclavicular joint separation (Rockwood Type III and higher), what is a key principle you must convey to the examiner regarding reconstructive techniques?
. Immediate return to heavy lifting is expected.
. The primary goal is pain relief, not necessarily full anatomical reduction.
. Coracoclavicular ligament reconstruction is crucial for lasting stability.
. Acromioclavicular ligament repair alone is sufficient.
. Deltoid and trapezius repair are the main determinants of success.

Correct Answer & Explanation

. Coracoclavicular ligament reconstruction is crucial for lasting stability.

Explanation

For chronic, symptomatic AC joint separations (Rockwood Type III and higher), especially Types IV, V, and VI, surgical reconstruction focuses on restoring the superior-inferior and anterior-posterior stability of the AC joint. Reconstruction of the coracoclavicular (CC) ligaments (conoid and trapezoid) is considered crucial for durable stability. Simply repairing the AC ligaments is often insufficient due to their inherent weakness. While deltotrapezial fascia repair is part of the procedure, CC ligament reconstruction is the primary principle for stability.

Test Yourself

Switch to an interactive, timed exam simulation to truly master this topic.

On this Page