Ortho Shoulder And Elbow Review | Dr Hutaif Shoulder & - ...

Question 1

A 24-year-old competitive rugby player presents with recurrent anterior shoulder instability. A 3D CT scan reveals a 24% anterior glenoid bone defect. He has failed an extensive course of non-operative management. What is the most appropriate surgical intervention?

Explanation

In collision athletes with significant anterior glenoid bone loss (typically >20%), soft tissue stabilization alone has an unacceptably high failure rate. The Latarjet procedure (coracoid transfer) is the gold standard for restoring stability by extending the glenoid articular arc and providing a 'sling effect' via the conjoint tendon.

Question 2

A 72-year-old female presents with chronic shoulder pain and an inability to actively elevate her arm above 40 degrees. On examination, she has a positive hornblower's sign but her deltoid function is intact. Radiographs demonstrate superior migration of the humeral head and acetabularization of the coracoacromial arch (Hamada grade 3). Which of the following is the most reliable surgical option?

Explanation

Reverse total shoulder arthroplasty (RTSA) is indicated for older patients with rotator cuff tear arthropathy and pseudoparalysis. It relies on the intact deltoid to elevate the arm by medializing and distalizing the center of rotation, which optimizes the deltoid's moment arm.

Question 3

In the surgical management of a 'terrible triad' injury of the elbow (elbow dislocation, radial head fracture, and coronoid fracture), what is the most accepted sequential order of structure repair to restore stability?

Explanation

The standard surgical algorithm for a terrible triad is performed deep-to-superficial: coronoid fracture fixation or anterior capsular repair is performed first, followed by radial head fixation or arthroplasty, and finally the lateral ulnar collateral ligament (LUCL) complex is repaired.

Question 4

Recent quantitative anatomic and perfusion studies have re-evaluated the principal vascular supply to the humeral head. Which of the following arteries is now recognized as providing the majority of the blood supply to the humeral head?

Explanation

Contrary to historic teaching that emphasized the arcuate branch of the anterior humeral circumflex artery, modern quantitative perfusion studies (e.g., Hettrich et al.) have demonstrated that the posterior humeral circumflex artery provides the predominant blood supply (approx. 64%) to the humeral head.

Question 5

A 28-year-old professional volleyball player complains of vague posterior shoulder pain and selective weakness in external rotation. Exam reveals isolated atrophy of the infraspinatus fossa. MRI is most likely to show a paralabral cyst causing nerve entrapment in which of the following locations?

Explanation

Entrapment of the suprascapular nerve at the spinoglenoid notch affects only the infraspinatus muscle, leading to isolated external rotation weakness. Entrapment at the more proximal suprascapular notch would affect both the supraspinatus and infraspinatus muscles.

Question 6

Posterolateral rotatory instability (PLRI) of the elbow is a clinical entity most frequently caused by insufficiency of which of the following capsuloligamentous structures?

Explanation

The Lateral Ulnar Collateral Ligament (LUCL) is the primary restraint to posterolateral rotatory instability (PLRI) of the elbow. Injury to the LUCL allows the radial head to subluxate posterolaterally away from the capitellum.

Question 7

A 45-year-old male undergoes a single-incision anterior approach for the repair of a distal biceps tendon rupture. Post-operatively, he complains of numbness over the lateral aspect of his forearm. Which nerve is most likely injured during this surgical exposure?

Explanation

The lateral antebrachial cutaneous (LABC) nerve is the most commonly injured nerve during a single-incision anterior approach to the distal biceps. The posterior interosseous nerve (PIN) is more at risk during a two-incision approach or with excessive deep retractor placement.

Question 8

During the repair of an acute pectoralis major tendon rupture, the surgeon isolates the distinct heads of the tendon. Which of the following accurately describes the anatomic insertion of the sternal head of the pectoralis major onto the humerus relative to the clavicular head?

Explanation

The pectoralis major tendon undergoes a 180-degree twist before its insertion. Consequently, the inferior (sternal) fibers twist to insert superiorly (proximally) and deep to the superior (clavicular) fibers on the lateral lip of the bicipital groove.

Question 9

A 5-year-old boy falls on an outstretched hand. Elbow radiographs reveal an ossific density within the medial aspect of the elbow joint space. The normal medial epicondyle ossification center is absent. To avoid misdiagnosing this incarcerated fragment as a normal developing ossification center, which ossification center's chronological appearance must be verified absent according to normal pediatric development?

Explanation

The correct order of elbow ossification is CRITOE. The medial (Internal) epicondyle normally appears around age 4-6. The Trochlea appears later (age 7-9). If an ossific density is seen in the medial joint of a 5-year-old, it cannot be the trochlea; it is an incarcerated medial epicondyle.

Question 10

A 40-year-old male presents to the ED after a seizure. He holds his left arm in internal rotation. Radiographs confirm a posterior shoulder dislocation. CT scan reveals an anteromedial humeral head impaction fracture (reverse Hill-Sachs lesion) involving 30% of the articular surface. Which of the following is the most appropriate surgical intervention?

Explanation

A reverse Hill-Sachs lesion involving 20-40% of the articular surface is best treated with a modified McLaughlin procedure (transfer of the lesser tuberosity with the attached subscapularis into the defect) to prevent the defect from engaging the posterior glenoid and causing recurrent instability.

Question 11

A 25-year-old patient presents with right shoulder pain and weakness when lifting objects above his head. Examination reveals medial scapular winging that worsens when the patient pushes against a wall. Injury to which of the following nerves is the most likely cause?

Explanation

Medial scapular winging is classically caused by paralysis of the serratus anterior muscle, which is innervated by the long thoracic nerve. Lateral winging is characteristic of trapezius paralysis due to spinal accessory nerve injury.

Question 12

In the surgical reconstruction of the medial ulnar collateral ligament (UCL) of the elbow in throwing athletes, the graft is primarily positioned to replicate the biomechanical function of which specific structural component?

Explanation

The anterior bundle of the UCL is the primary restraint to valgus stress. Specifically, the anterior band of the anterior bundle is taut in extension and the primary restraint up to 90 degrees of flexion, making it the primary target for anatomical reproduction during Tommy John surgery.

Question 13

When performing an olecranon osteotomy to gain exposure for fixing a complex intra-articular distal humerus fracture (AO/OTA 13-C3), what is the optimal shape of the osteotomy to maximize postoperative stability, healing surface area, and rotational control?

Explanation

A chevron osteotomy with the apex pointing distally is preferred. It provides greater surface area for healing and affords intrinsic rotational stability compared to a standard transverse osteotomy. It is typically directed into the 'bare area' of the trochlear notch.

Question 14

Which of the following factors has been shown in the literature to be the most significant independent risk factor for nonunion in the nonoperative management of midshaft clavicle fractures?

Explanation

While smoking and comminution are recognized risk factors, severe displacement (greater than 100%, indicating no cortical contact) and significant shortening (typically >2.0 cm) are the most significant independent predictors of nonunion in nonoperatively treated midshaft clavicle fractures.

Question 15

A 55-year-old female with Type I diabetes mellitus presents with progressive, severe restriction of both active and passive shoulder motion. She is diagnosed with primary adhesive capsulitis. Which cytokine is most strongly implicated in driving the excessive capsular fibroblastic proliferation seen in this condition?

Explanation

Transforming growth factor-beta (TGF-b) and platelet-derived growth factor (PDGF) are the primary cytokines implicated in the pathogenesis of adhesive capsulitis, promoting excessive fibroblastic proliferation and subsequent capsular fibrosis.

Question 16

Glenohumeral Internal Rotation Deficit (GIRD) in the overhead throwing athlete is biomechanically linked to the development of a Type II SLAP tear. Which capsular abnormality is considered the primary driver of this internal rotation deficit and the resultant peel-back mechanism?

Explanation

Posterior capsular contracture (manifesting clinically as GIRD) causes an obligate posterosuperior shift of the glenohumeral center of rotation during the late cocking phase of throwing. This increases the peel-back forces on the superior labrum-biceps complex, leading to SLAP tears.

Question 17

During a Reverse Total Shoulder Arthroplasty (RTSA), superior or posterior retractor placement and aberrant screw placement in the superior or posterior glenoid vault can most likely cause iatrogenic injury to which of the following nerves?

Explanation

The suprascapular nerve courses intimately along the posterior aspect of the glenoid neck (from the suprascapular notch to the spinoglenoid notch). It is highly vulnerable to injury from over-penetrating posterior or superior glenoid baseplate screws and aggressive posterior retraction.

Question 18

A 12-year-old Little League pitcher presents with medial elbow pain. Radiographs demonstrate widening of the medial epicondyle apophysis without displacement. What is the most common underlying pathomechanical force responsible for this condition (Little Leaguer's elbow)?

Explanation

Medial epicondyle apophysitis (Little Leaguer's elbow) in overhead throwing athletes is caused by repetitive valgus overload during the late cocking and early acceleration phases of throwing. This places enormous tensile stress on the developing medial structures.

Question 19

In the surgical treatment of high-grade acromioclavicular (AC) joint separations, reconstruction often targets the coracoclavicular (CC) ligaments. Which of the following accurately describes the anatomy of the native CC ligaments?

Explanation

The coracoclavicular (CC) ligaments consist of the conoid and trapezoid. The conoid ligament is located posteromedially and is the primary restraint to superior translation. The trapezoid is located anterolaterally and provides primary restraint against axial compression.

Question 20

A 35-year-old female sustains a highly comminuted radial head fracture from a fall. Intraoperatively, the radial head is deemed unreconstructable. Prior to deciding on a radial head arthroplasty versus excision, what intraoperative finding strongly dictates the absolute necessity for a radial head prosthesis?

Explanation

An Essex-Lopresti injury involves a radial head fracture, disruption of the central band of the interosseous membrane, and DRUJ instability. In this setting, the radial head cannot simply be excised; it must be replaced with a prosthesis to prevent severe proximal radial migration and subsequent ulnocarpal impaction.

Question 21

Which of the following best describes the biomechanical advantage of shifting the center of rotation medially and distally in a reverse total shoulder arthroplasty (rTSA)?

Explanation

In a reverse total shoulder arthroplasty, the center of rotation is shifted medially and distally compared to the native shoulder. This biomechanical alteration increases the deltoid moment arm and tension, recruiting more anterior and posterior deltoid fibers for elevation and abduction, compensating for the lack of a functional rotator cuff.

Question 22

During a Latarjet procedure, retractors are often placed deep to the conjoint tendon. To avoid neuropraxia or permanent injury to the musculocutaneous nerve, retractor placement must be carefully monitored. What is the generally accepted 'safe zone' for retractor placement in relation to the coracoid process?

Explanation

The musculocutaneous nerve typically penetrates the deep surface of the conjoint tendon (coracobrachialis and short head of biceps) anywhere from 3 to 8 cm distal to the tip of the coracoid process. Therefore, the 'safe zone' for placing retractors under the conjoint tendon is proximally, within 3 cm of the coracoid tip, to avoid stretching or compressing the nerve.

Question 23

A 35-year-old male sustains a fracture involving the anteromedial facet of the coronoid process after a fall on an outstretched hand. If this fracture is not properly stabilized, the elbow is at highest risk for developing which specific pattern of instability?

Explanation

Fractures of the anteromedial facet of the coronoid (O'Driscoll Subtype 2) compromise the insertion of the anterior bundle of the MCL and the medial bony buttress of the ulna. If left untreated, this typically leads to varus posteromedial rotatory instability (VPMRI) of the elbow, often accompanied by LCL disruption.

Question 24

What is the most widely accepted surgical sequence for repairing a 'terrible triad' injury of the elbow (elbow dislocation, radial head fracture, and coronoid fracture)?

Explanation

The standard algorithm for repairing a terrible triad injury follows a deep-to-superficial and medial-to-lateral protocol through a lateral approach: first, fixation of the coronoid (to restore the anterior buttress); second, fixation or replacement of the radial head (to restore the lateral column); and third, repair of the lateral collateral ligament (LCL) complex to the lateral epicondyle.

Question 25

A lower trapezius tendon transfer is performed for a patient with a massive, irreparable posterosuperior rotator cuff tear to restore active external rotation. What is the primary motor innervation to the transferred muscle?

Explanation

The trapezius muscle, including its lower fibers utilized in this tendon transfer, is innervated by the spinal accessory nerve (Cranial Nerve XI). This is critical knowledge during harvest and mobilization to avoid denervating the transfer.

Question 26

A 24-year-old trauma patient presents with scapulothoracic dissociation characterized by massive lateral displacement of the scapula on the AP chest radiograph. Due to the high mortality and morbidity associated with this injury, which of the following must be evaluated emergently?

Explanation

Scapulothoracic dissociation is a high-energy injury often described as a 'closed forequarter amputation'. It is associated with severe neurovascular trauma. Subclavian or axillary artery disruption is highly prevalent and life-threatening; therefore, emergent vascular assessment (angiography/CTA) is the most critical immediate step.

Question 27

A 22-year-old rugby player sustains a posterior sternoclavicular (SC) joint dislocation. Which anatomical structure lies directly posterior to the medial clavicle and is at highest risk of catastrophic injury during reduction or from the injury itself?

Explanation

The brachiocephalic (innominate) vein is the vascular structure most intimately associated with the posterior aspect of the medial clavicle and sternoclavicular joint. Injury or compression of this vessel is a major concern in posterior SC joint dislocations.

Question 28

A 45-year-old female presents with a coronal shear fracture of the distal humerus. The radiograph demonstrates a 'double arc' sign on the lateral view. This radiographic finding is pathognomonic for which specific injury pattern?

Explanation

The 'double arc' sign on a lateral radiograph of the elbow represents the subchondral bone of the capitellum (one arc) and the lateral ridge of the trochlea (the second arc). It is pathognomonic for a Type IV (McKee modification of the Bryan and Morrey classification) coronal shear fracture, which involves the capitellum extending medially to include most of the trochlea.

Question 29

A 28-year-old elite overhead athlete presents with painless weakness in the dominant shoulder. Physical examination reveals isolated severe atrophy of the infraspinatus muscle, but completely preserved muscle bulk and strength of the supraspinatus. Where is the most likely anatomical site of nerve compression?

Explanation

The suprascapular nerve innervates both the supraspinatus and infraspinatus. It passes through the suprascapular notch (where compression affects both muscles) and then winds around the spinoglenoid notch to supply the infraspinatus. Compression at the spinoglenoid notch (often due to a paralabral cyst) causes isolated infraspinatus weakness and atrophy.

Question 30

In the design of a linked, semiconstrained total elbow arthroplasty (TEA), what is the primary biomechanical function of incorporating a 'sloppy hinge' (allowing 5-10 degrees of varus-valgus laxity)?

Explanation

The 'sloppy hinge' in linked semiconstrained total elbow arthroplasties allows a small amount of varus-valgus and rotational play. This design feature significantly reduces the transmission of torsional and bending stresses to the implant-cement-bone interface, thereby reducing the rate of aseptic loosening.

Question 31

In a complete rupture of the pectoralis major tendon sustained during weightlifting (e.g., bench press), which specific portion of the muscle-tendon unit is anatomically most prone to failure, and what is its normal insertion pattern?

Explanation

Pectoralis major ruptures most frequently involve the sternal head. As the tendon approaches the humerus, the fibers rotate 180 degrees so that the inferior (sternal) fibers twist to insert superiorly (proximally) and deep to the clavicular fibers. When the arm is extended and externally rotated, these deep, proximal fibers are placed under maximum tension, predisposing them to rupture.

Question 32

During an anatomic coracoclavicular (CC) ligament reconstruction for a chronic Type V acromioclavicular joint separation, bone tunnels are drilled in the clavicle to recreate the native anatomy. What is the approximate anatomical distance from the distal end of the clavicle to the center of the conoid and trapezoid insertions, respectively?

Explanation

The native coracoclavicular ligaments consist of the conoid (medial and posterior) and the trapezoid (lateral and anterior). The center of the trapezoid insertion is approximately 3.0 cm from the distal clavicle, while the center of the conoid insertion is approximately 4.5 cm from the distal end.

Question 33

Which specific portion of the ulnar collateral ligament (UCL) complex of the elbow serves as the primary restraint to valgus stress from 30 to 120 degrees of flexion, and what is its anatomic ulnar insertion?

Explanation

The anterior bundle of the medial (ulnar) collateral ligament is the primary restraint to valgus stress of the elbow. It originates on the anterior inferior surface of the medial epicondyle and inserts on the sublime tubercle of the anteromedial coronoid process.

Question 34

When performing an open subpectoral biceps tenodesis, deep retraction is required to expose the humerus. If retractors are placed too far medially, which nerve is at greatest risk of iatrogenic injury?

Explanation

During a subpectoral biceps tenodesis, medial retraction near the conjoint tendon places the musculocutaneous nerve at high risk. It runs medially in the vicinity of the conjoint tendon before piercing the coracobrachialis. Excessive medial retraction can result in neuropraxia or structural injury to this nerve.

Question 35

A 24-year-old male with recurrent anterior shoulder instability is evaluated preoperatively with 3D CT. The concept of the 'glenoid track' is used to evaluate the interplay between glenoid bone loss and a Hill-Sachs lesion. Which of the following correctly defines an 'off-track' Hill-Sachs lesion?

Explanation

The glenoid track is calculated as 83% of the intact glenoid width minus any anterior bone loss. If the medial margin of the Hill-Sachs lesion extends further medially than the medial margin of the glenoid track, it will fall 'off-track' and engage the anterior glenoid rim upon external rotation and abduction. This requires addressing the humeral side (e.g., remplissage) or increasing the glenoid track (e.g., Latarjet).

Question 36

In the surgical management of a displaced 3-part proximal humerus fracture using a locking plate, failure to restore adequate medial cortical support (the medial hinge) most frequently leads to which of the following mechanical failures?

Explanation

Loss of medial calcar support (the medial hinge) in proximal humerus fractures deprives the construct of its structural buttress. With the deforming forces of the rotator cuff, this predictably leads to varus collapse of the humeral head, resulting in the superior screws cutting out and penetrating the articular surface.

Question 37

A superior capsular reconstruction (SCR) using a thick dermal allograft is performed for a patient with a massive, irreparable posterosuperior rotator cuff tear. Biomechanically, what is the primary structural role of the graft in this procedure?

Explanation

The primary biomechanical role of the graft in a Superior Capsular Reconstruction (SCR) is to act as a static restraint against superior humeral head migration. By recreating the superior capsular roof (fulcrum), it restores the native force couples, allowing the remaining rotator cuff and deltoid to effectively elevate the arm without early superior impingement.

Question 38

A 40-year-old male presents with a locked posterior shoulder dislocation sustained during a seizure. Imaging reveals a reverse Hill-Sachs (impaction) defect involving 35% of the anterior articular surface of the humeral head. Assuming an intact glenohumeral joint otherwise, which of the following is the most appropriate surgical management?

Explanation

For reverse Hill-Sachs defects involving 20% to 40% of the humeral head articular surface in posterior shoulder dislocations, structural filling of the defect is required to prevent recurrent instability. The modified McLaughlin procedure (transferring the lesser tuberosity with the attached subscapularis into the defect) or allograft reconstruction are the treatments of choice.

Question 39

The distal biceps tendon normally inserts onto the radial tuberosity. To maximize the biomechanical supination moment arm (the 'cam effect') during an anatomical surgical repair of a distal biceps rupture, where should the tendon be optimally positioned on the tuberosity?

Explanation

The native distal biceps tendon inserts on the ulnar (posterior) aspect of the radial tuberosity. Reattaching the tendon to this ulnar footprint maximizes the 'cam effect' around the radius, thereby restoring maximal supination torque. A more anterior placement results in a significant loss of supination strength.

Question 40

In a patient presenting with primary adhesive capsulitis (frozen shoulder), the classic physical examination finding is marked restriction of passive external rotation with the arm adducted at the side. This specific restriction is most anatomically attributed to contracture of which of the following structures?

Explanation

Loss of external rotation with the arm resting at the side (0 degrees of abduction) is the hallmark of adhesive capsulitis. This specific motion restriction is predominantly caused by contracture and fibroplasia of the rotator interval and the coracohumeral ligament (CHL).

Question 41

Varus posteromedial rotatory instability (VPMRI) of the elbow is characterized by a fracture of the anteromedial facet of the coronoid. What is the typical mechanism of injury that produces this specific instability pattern?

Explanation

Varus posteromedial rotatory instability (VPMRI) typically occurs from a fall on an outstretched hand resulting in an axial load, varus stress, and pronation. This forces the anteromedial facet of the coronoid against the medial trochlea, causing a fracture, and usually results in rupture of the lateral collateral ligament (LCL) complex.

Question 42

During a Latarjet procedure for recurrent anterior shoulder instability, careful retraction of the conjoint tendon is essential. Over-retraction medially places which of the following nerves at the greatest risk of iatrogenic injury?

Explanation

The musculocutaneous nerve typically enters the coracobrachialis 5 to 8 cm distal to the tip of the coracoid process. Aggressive medial retraction of the conjoint tendon during the Latarjet procedure places a stretch on this nerve, making it the most vulnerable to neuropraxia or structural injury in this specific step.

Question 43

A 70-year-old female undergoes a reverse total shoulder arthroplasty (RTSA) for rotator cuff tear arthropathy. To minimize the risk of inferior scapular notching, which is a common complication, how should the glenosphere baseplate optimally be positioned?

Explanation

Scapular notching occurs when the humeral component impinges on the inferior scapular neck during adduction. The risk is significantly minimized by positioning the glenosphere with inferior translation (so it overhangs the inferior glenoid rim by 2-4 mm) and placing it with an inferior tilt.

Question 44

In posterolateral rotatory instability (PLRI) of the elbow, the primary deficient structure is the lateral ulnar collateral ligament (LUCL). What are the precise anatomic origin and insertion of the LUCL?

Explanation

The LUCL originates on the lateral epicondyle, blends with the annular ligament, and inserts on the supinator crest of the proximal ulna. It serves as the primary restraint to posterolateral rotatory instability.

Question 45

A 58-year-old male weightlifter presents with advanced glenohumeral osteoarthritis. A CT scan reveals a biconcave glenoid with severe retroversion and posterior subluxation of the humeral head. According to the Walch classification, what type of glenoid morphology does this represent?

Explanation

In the Walch classification for glenohumeral arthritis, a Type B2 glenoid is characterized by a biconcave surface, asymmetric posterior wear, and posterior subluxation of the humeral head. This presents a significant challenge in anatomic total shoulder arthroplasty, often requiring eccentric reaming or augmented glenoid components.

Question 46

A 28-year-old overhead athlete presents with posterior shoulder pain and weakness in external rotation. Forward elevation and internal rotation strength are normal. MRI reveals a paralabral cyst in the spinoglenoid notch. Which physical examination finding is most likely to be exclusively present?

Explanation

A cyst at the spinoglenoid notch compresses the suprascapular nerve distal to the motor branches that supply the supraspinatus. This results in isolated denervation and subsequent atrophy/weakness of the infraspinatus muscle. A cyst at the suprascapular notch would affect both the supraspinatus and infraspinatus.

Question 47

A patient undergoes surgical repair of an acute distal biceps tendon rupture using a single-incision anterior approach. Postoperatively, he complains of burning pain and numbness along the lateral aspect of his forearm. Which nerve was most likely injured during the surgical exposure?

Explanation

The lateral antebrachial cutaneous nerve (LABCN) is a continuation of the musculocutaneous nerve and exits laterally in the distal arm. It lies in close proximity to the cephalic vein and the lateral border of the biceps tendon, making it highly susceptible to injury or traction neuropraxia during a single-incision anterior approach for distal biceps repair.

Question 48

A 35-year-old male presents with a locked posterior shoulder dislocation following a seizure. CT imaging shows a reverse Hill-Sachs lesion (anteromedial humeral head defect) involving approximately 35% of the articular surface. The joint is unstable after closed reduction. What is the most appropriate surgical management?

Explanation

For reverse Hill-Sachs defects involving 20% to 40% of the articular surface, filling the defect is required to restore stability. The McLaughlin procedure (transfer of the subscapularis tendon) or the Neer modification (transfer of the lesser tuberosity with the subscapularis) into the anterior defect is the treatment of choice. Defects >40% typically require arthroplasty.

Question 49

The anterior bundle of the medial collateral ligament (AMCL) is the primary restraint to valgus instability of the elbow. What is the precise distal insertion site of the AMCL?

Explanation

The anterior bundle of the MCL originates on the anterior inferior surface of the medial epicondyle and inserts on the sublime tubercle, which is located on the medial aspect of the base of the coronoid process of the ulna.

Question 50

When evaluating a proximal humerus fracture to determine the risk of developing avascular necrosis (AVN), which of the following radiographic findings (Hertel's criteria) is the most reliable predictor of ischemia to the humeral head?

Explanation

Hertel identified specific predictors for AVN in proximal humerus fractures. The highest risk occurs with a metaphyseal head extension (calcar length) of less than 8 mm, disruption of the medial hinge, and a true anatomical neck fracture. A short calcar segment indicates that the ascending branch of the anterior humeral circumflex artery is likely disrupted.

Question 51

A 45-year-old male presents with severe cubital tunnel syndrome that has failed conservative management. During an in situ ulnar nerve decompression, which of the following structures forms the anatomic roof of the cubital tunnel and must be released?

Explanation

Osborne's ligament (also known as the cubital tunnel retinaculum or arcuate ligament) spans between the olecranon and the medial epicondyle, bridging the two heads of the flexor carpi ulnaris (FCU). It forms the roof of the cubital tunnel and is a primary site of ulnar nerve compression.

Question 52

A 14-year-old male baseball pitcher presents with lateral elbow pain and catching. Radiographs and MRI demonstrate a detached osteochondral fragment in the capitellum with an underlying fluid signal. What is the most appropriate diagnosis?

Explanation

Osteochondritis dissecans (OCD) of the capitellum typically occurs in adolescent throwing athletes (ages 12-16) and can progress to loose body formation and articular cartilage damage. Panner disease is an osteochondrosis of the entire capitellum seen in younger children (typically ages 7-10) and is generally self-limiting without loose body formation.

Question 53

A 30-year-old male weightlifter complains of poorly localized posterior shoulder pain and numbness over the lateral deltoid. Physical examination reveals focal point tenderness in the quadrilateral space. Which vascular structure is at risk of compression in this space alongside the affected nerve?

Explanation

Quadrilateral space syndrome involves the compression of the axillary nerve and the posterior circumflex humeral artery. The boundaries of the space are the teres minor (superior), teres major (inferior), long head of the triceps (medial), and the surgical neck of the humerus (lateral).

Question 54

A 22-year-old rugby player sustains a direct blow to the medial clavicle, resulting in a posterior sternoclavicular (SC) joint dislocation. Which ligamentous structure is considered the strongest and primary stabilizer preventing anterior-posterior translation of the SC joint?

Explanation

The posterior sternoclavicular capsule (which includes the posterior SC ligament) is the strongest structural restraint to both anterior and posterior translation of the medial clavicle. Its integrity is critical for SC joint stability.

Question 55

During a radial head arthroplasty for a comminuted radial head fracture, the surgeon inadvertently overstuffs the radiocapitellar joint by 4 mm. Which of the following biomechanical consequences is most likely to occur as a direct result of this technical error?

Explanation

Overstuffing the radial head (>2 mm) leads to excessive contact pressures on the capitellum, causing accelerated capitellar wear, loss of terminal flexion/extension, and a 'hinging' effect that results in asymmetric lateral widening of the ulnohumeral joint space.

Question 56

A 35-year-old female presents with shoulder weakness 3 months after a posterior triangle cervical lymph node biopsy. On physical examination, the shoulder exhibits lateral winging of the scapula when she abducts her arm. Injury to which nerve is responsible for this physical finding?

Explanation

The spinal accessory nerve (CN XI) innervates the trapezius. Iatrogenic injury in the posterior triangle of the neck leads to trapezius palsy, which characteristically presents as lateral winging of the scapula (the scapula translates laterally and downward). In contrast, long thoracic nerve injury causes medial winging.

Question 57

In the biomechanics of the acromioclavicular (AC) joint, the coracoclavicular (CC) ligaments provide primary vertical and axial stability. Which of the following statements accurately describes the specific anatomy and function of the CC ligaments?

Explanation

The coracoclavicular complex consists of the conoid and trapezoid ligaments. The conoid ligament is located posteromedially and is the primary restraint to superior translation of the clavicle. The trapezoid ligament is located anterolaterally and primarily restricts axial compression (acromion translating medially beneath the clavicle).

Question 58

A 12-year-old elite baseball pitcher presents with poorly localized shoulder pain that worsens strictly with throwing. Radiographs reveal widening and lateral fragmentation of the proximal humeral physis compared to the contralateral side. What is the most appropriate initial management for this condition?

Explanation

Little League Shoulder is an overuse injury causing proximal humeral epiphysiolysis (stress fracture of the physis). The definitive initial treatment is complete cessation of throwing (usually for 3 months) until the patient is asymptomatic and radiographs show healing, followed by a gradual return-to-throwing program.

Question 59

A 25-year-old male bodybuilder feels a 'pop' in his anterior axilla while performing heavy bench presses. MRI confirms a complete rupture of the pectoralis major tendon. Regarding the anatomy of the pectoralis major insertion on the humerus, which of the following is true?

Explanation

The pectoralis major tendon twists 180 degrees before inserting on the lateral lip of the bicipital groove. Because of this twist, the sternal (inferior) head inserts superiorly (proximal) and deep relative to the clavicular (superior) head. The sternal head is under the most tension when the arm is extended and abducted, making it the first to rupture during eccentric loads like bench pressing.

Question 60

A 42-year-old male sustains a complete distal triceps tendon rupture after a fall on an outstretched hand. During surgical repair using a transosseous cruciate technique, it is crucial to reattach the tendon to its anatomic footprint. Where is the normal anatomic insertion footprint of the triceps tendon?

Explanation

The triceps tendon inserts over a broad, dome-shaped footprint on the proximal olecranon. It begins slightly distal (1-2 cm) to the articular margin of the olecranon tip and extends distally. The deep medial head fibers insert closer to the joint line, while the lateral and long heads insert more superficially and distally.

Question 61

A 45-year-old male laborer presents with acute anterior elbow pain and ecchymosis after attempting to lift a heavy box. Examination reveals a positive hook test. During a single-incision anterior surgical repair using suture anchors, which nerve is at the highest risk of injury?

Explanation

The lateral antebrachial cutaneous nerve (LABC) is the most commonly injured nerve during a single-incision distal biceps repair due to its proximity to the surgical field and cephalic vein.

Question 62

A 62-year-old male presents with advanced glenohumeral osteoarthritis. CT scan reveals a retroverted biconcave glenoid (Walch B2) with 20 degrees of retroversion. He has an intact rotator cuff. What is the most appropriate surgical management?

Explanation

In patients with a Walch B2 glenoid and significant retroversion (>15 degrees), an augmented glenoid component or eccentric reaming in total shoulder arthroplasty (TSA) addresses the retroversion to prevent early posterior failure. Reverse TSA is typically reserved for cuff deficiency or older age with severe deformity.

Question 63

A 35-year-old female presents with shoulder pain and weakness 4 weeks after a posterior cervical triangle lymph node biopsy. On examination, the affected shoulder droops, and the scapula rests lateral to the midline and wings when she abducts her arm. Injury to which of the following nerves is the most likely cause?

Explanation

The spinal accessory nerve (CN XI) innervates the trapezius; injury in the posterior triangle causes lateral scapular winging and a drooping shoulder. Long thoracic nerve injury causes medial winging.

Question 64

A 32-year-old female complains of a recurrent clicking and giving way of her elbow when pushing up from a chair. Physical examination demonstrates apprehension with the elbow supinated, axially loaded, and moving from extension into flexion. Which ligamentous structure is primarily deficient?

Explanation

The patient has posterolateral rotatory instability (PLRI), characterized by a positive pivot-shift test. This condition is caused by a deficiency of the lateral ulnar collateral ligament (LUCL).

Question 65

A 22-year-old elite collegiate baseball pitcher presents with deep shoulder pain and decreased throwing velocity. MRI arthrogram shows a peel-back of the superior labrum with detachment of the biceps anchor (Type II SLAP tear). Conservative treatment has failed. What is the most appropriate surgical approach?

Explanation

In a young, high-demand overhead throwing athlete, an arthroscopic SLAP repair is the preferred treatment to restore normal mechanics. Biceps tenodesis is typically favored in older, non-throwing patients.

Question 66

A 75-year-old female with osteoporosis sustains a 4-part proximal humerus fracture. Radiographs show severe comminution of the calcar and the humeral head split into two fragments. What is the most reliable surgical option to restore active elevation?

Explanation

Reverse total shoulder arthroplasty is the most reliable option for elderly patients with complex 4-part or head-split proximal humerus fractures, especially when tuberosity healing is unpredictable and bone quality is poor.

Question 67

A 40-year-old man falls onto an outstretched hand and presents with anterior shoulder pain. He has a positive bear hug test and belly press test. The external rotation lag sign is negative. MRI confirms an isolated tear of the subscapularis tendon. Which of the following associated findings is most likely present?

Explanation

The subscapularis tendon provides the medial restraint for the long head of the biceps tendon. Isolated subscapularis tears often lead to medial subluxation or dislocation of the biceps tendon.

Question 68

A 28-year-old competitive weightlifter feels a pop in his anterior axillary fold while performing a heavy bench press. Examination reveals loss of the anterior axillary contour and weakness in internal rotation and adduction. MRI shows a rupture of the sternocostal head of the pectoralis major. Where does the sternocostal head normally insert?

Explanation

The sternocostal head of the pectoralis major twists before insertion, attaching deep and proximal to the clavicular head on the lateral lip of the bicipital groove. This anatomy must be accurately restored during surgical repair.

Question 69

A 34-year-old female sustains a coronal shear fracture of the distal humerus involving the capitellum and the lateral aspect of the trochlea. The fracture extends into the lateral epicondyle. Which surgical approach provides the most optimal visualization for open reduction and internal fixation?

Explanation

The extended lateral approach provides excellent exposure for coronal shear fractures involving the capitellum and lateral trochlea, allowing anterior-to-posterior or posterior-to-anterior screw fixation.

Question 70

A 55-year-old male presents with numbness in his small and ring fingers and intrinsic muscle weakness. Electrodiagnostic studies confirm severe ulnar neuropathy at the elbow. During an open surgical release, which structure forms the primary roof of the cubital tunnel?

Explanation

Osborne's ligament (the cubital tunnel retinaculum) bridges the two heads of the flexor carpi ulnaris and forms the roof of the cubital tunnel. Release of this structure is a critical step in ulnar nerve decompression.

Question 71

A 42-year-old male suffers a seizure and subsequently complains of shoulder pain and inability to externally rotate his arm. An axillary lateral radiograph reveals a posterior shoulder dislocation with an anteromedial humeral head defect (reverse Hill-Sachs lesion) involving 35% of the articular surface. What is the most appropriate management?

Explanation

For a locked posterior dislocation with a reverse Hill-Sachs defect between 25-40%, a McLaughlin procedure or modified McLaughlin is indicated to fill the defect and prevent recurrent engagement.

Question 72

A 19-year-old male is tackled during a football game and sustains a posterior sternoclavicular joint dislocation. He reports mild difficulty swallowing but has normal vital signs. Attempted closed reduction in the operating room under general anesthesia fails. What is the next most appropriate step in management?

Explanation

Irreducible posterior sternoclavicular dislocations require open reduction and graft stabilization. A cardiothoracic surgeon must be available due to the risk of injury to underlying mediastinal vessels. K-wires are contraindicated due to the risk of fatal migration.

Question 73

A 68-year-old female with severe rheumatoid arthritis undergoes a primary linked semi-constrained total elbow arthroplasty (TEA). Post-operatively, what is the generally recommended permanent lifetime lifting restriction for the operated arm?

Explanation

To prevent aseptic loosening and bushing wear, patients with a linked total elbow arthroplasty are typically given a permanent lifting restriction of approximately 1-2 lbs repetitively and a 5-10 lbs maximum for a single event.

Question 74

A 24-year-old manual worker presents with painful crepitus and snapping at the superomedial border of his scapula. Non-operative management has failed after 6 months. Imaging reveals a skeletal prominence at the superomedial angle. What is the anatomical name of this structure commonly responsible for this syndrome?

Explanation

Luschka's tubercle is an anatomic variant featuring an enlarged superomedial angle of the scapula. It is a classic bony cause of snapping scapula syndrome.

Question 75

A 30-year-old elite volleyball player complains of vague posterior shoulder pain and weakness in external rotation. Examination shows isolated atrophy of the infraspinatus fossa. MRI shows a paralabral cyst at the spinoglenoid notch. Which finding is most likely to be present on physical examination?

Explanation

Entrapment of the suprascapular nerve at the spinoglenoid notch affects only the motor branch to the infraspinatus, causing isolated weakness in external rotation. The supraspinatus (abduction) is spared.

Question 76

A 45-year-old male hears a pop in his anterior elbow while lifting a heavy box. On examination, he has a positive hook test. He undergoes a single-incision distal biceps tendon repair. Postoperatively, he complains of numbness along the lateral aspect of his forearm. Which structure was most likely injured during the surgical exposure?

Explanation

The lateral antebrachial cutaneous nerve (LABCN) is the most commonly injured nerve during a single-incision anterior approach to the distal biceps. It exits laterally between the biceps and brachialis muscles.

Question 77

A 30-year-old male presents with lateral elbow pain and a clicking sensation when extending and supinating the elbow. He is diagnosed with posterolateral rotatory instability (PLRI) and is scheduled for ligament reconstruction. What are the correct isometric points for reconstructing the primary ligament deficient in this condition?

Explanation

PLRI is caused by insufficiency of the lateral ulnar collateral ligament (LUCL). The anatomic origin of the LUCL is the lateral epicondyle, and its insertion is on the supinator crest of the proximal ulna.

Question 78

Reverse total shoulder arthroplasty (rTSA) relies heavily on the deltoid muscle to compensate for a deficient rotator cuff. How does the standard Grammont-style rTSA alter glenohumeral biomechanics to achieve this?

Explanation

The Grammont-style rTSA medializes and distalizes the center of rotation. This increases the deltoid moment arm and tension, allowing it to effectively elevate the arm in the absence of a functional rotator cuff.

Question 79

A 65-year-old female sustains a complex proximal humerus fracture. According to the Hertel criteria, which of the following radiographic features is the most reliable predictor of humeral head ischemia?

Explanation

Hertel's criteria identify a medial hinge length of less than 2 mm, an intact posteromedial metaphyseal extension of less than 8 mm, and anatomic neck fracture patterns as the most significant predictors of ischemia.

Question 80

A 25-year-old cyclist falls directly onto his shoulder, sustaining a Type V acromioclavicular (AC) joint separation. The surgeon plans a coracoclavicular (CC) ligament reconstruction. Which of the following accurately describes the anatomic insertions of the native CC ligaments on the clavicle?

Explanation

The conoid ligament inserts posteromedially on the conoid tubercle (roughly 45 mm from the distal clavicle), while the trapezoid ligament inserts anterolaterally (roughly 25 mm from the distal clavicle).

Question 81

A 22-year-old overhead athlete presents with persistent anterior shoulder apprehension. Magnetic resonance arthrography (MRA) demonstrates a "J sign" with extravasation of contrast into the axillary pouch due to an avulsion of the inferior glenohumeral ligament from the humeral neck. What is the eponymous term for this lesion?

Explanation

A Humeral Avulsion of the Glenohumeral Ligament (HAGL) lesion describes the tearing of the IGHL off the humeral neck. On MRI, the normal U-shaped axillary pouch drops into a "J" shape.

Question 82

A 30-year-old competitive weightlifter feels a sudden "pop" while performing a heavy bench press. Examination reveals loss of the anterior axillary fold and weakness in internal rotation. MRI confirms a rupture of the sternal head of the pectoralis major. Where does the sternal head normally insert relative to the clavicular head on the humerus?

Explanation

The pectoralis major tendon undergoes a 180-degree twist before insertion. Consequently, the sternal head fibers pass behind the clavicular fibers to insert proximal and deep on the lateral lip of the bicipital groove.

Question 83

A 40-year-old male sustains a locked posterior shoulder dislocation during a seizure. A CT scan reveals an anterior articular impaction fracture (reverse Hill-Sachs lesion) involving 30% of the humeral head articular surface. What is the most appropriate surgical management?

Explanation

For reverse Hill-Sachs lesions involving 20% to 40% of the articular surface, transferring the lesser tuberosity with the subscapularis tendon into the defect (Modified McLaughlin procedure) provides excellent stability.

Question 84

A 35-year-old female falls onto an outstretched hand. A lateral radiograph of the elbow demonstrates a "double arc sign." What specific injury does this radiographic finding indicate?

Explanation

The double arc sign on a lateral elbow radiograph indicates a capitellum fracture that extends medially to involve the lateral ridge of the trochlea, classified as a Type IV capitellum fracture (McKee modification).

Question 85

A 45-year-old tennis player fails 12 months of conservative management for lateral epicondylitis. An open debridement of the extensor carpi radialis brevis (ECRB) is planned. Topographically, where is the ECRB origin located relative to the extensor carpi radialis longus (ECRL)?

Explanation

The ECRB origin is located deep and distal to the ECRL origin. The ECRL originates higher up on the lateral supracondylar ridge.

Question 86

A 68-year-old male with severe glenohumeral osteoarthritis undergoes preoperative planning for an anatomic total shoulder arthroplasty. A 3D CT scan reveals a Walch B2 glenoid with 22 degrees of retroversion and significant posterior subluxation. What is the most appropriate intraoperative management of the glenoid?

Explanation

For glenoid retroversion exceeding 15 degrees, eccentric anterior reaming removes too much subchondral bone, risking catastrophic glenoid loosening. An augmented component or bone grafting is required to restore version.

Question 87

A 28-year-old elite volleyball player presents with insidious onset of shoulder pain and isolated weakness in external rotation. An MRI demonstrates a paralabral cyst in the spinoglenoid notch compressing a nerve. This cyst is most commonly associated with which of the following intra-articular pathologies?

Explanation

Spinoglenoid notch cysts strongly correlate with posterior or posterosuperior labral tears. A one-way valve effect forces joint fluid into the cyst, which compresses the distal branches of the suprascapular nerve supplying the infraspinatus.

Question 88

A 35-year-old male develops medial scapular winging following a prolonged viral illness. Electromyography confirms neuropathy of the affected muscle's primary nerve. Which nerve roots predominantly supply this injured nerve?

Explanation

Medial scapular winging is caused by serratus anterior paralysis secondary to long thoracic nerve injury. The long thoracic nerve is formed by the ventral rami of C5, C6, and C7.

Shoulder And Elbow: Review | Dr Hutaif Shoulder & Elbow -...

Ortho Shoulder And Elbow Review | Dr Hutaif Shoulder & - ...

Key Takeaway

Ortho Shoulder And Elbow Review | Dr Hutaif Shoulder & - ...

Chapter Index