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Master Diagnosis: Shoulder & Elbow Cases (Reproduced with Permission)

Elbow Structured Oral: Master This Orthopedic Exam Question 3

23 Apr 2026 73 min read 145 Views
Illustration of elbow structured oral - Dr. Mohammed Hutaif

Key Takeaway

This article provides essential research regarding Elbow Structured Oral: Master This Orthopedic Exam Question 3. An elbow structured oral examination evaluates a candidate's orthopedic expertise through case-based scenarios. It assesses skills in patient history, physical examination, differential diagnosis, and management planning for conditions like frozen shoulder, including discussing treatments such as steroid injections, MUA, or arthroscopic arthrolysis, and associated patient risks.

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Question 1

A 45-year-old male presents with chronic posterolateral rotatory instability (PLRI) of the elbow after a remote fall. He failed conservative management. Clinically, he has a positive lateral pivot shift test. Which of the following structures is primarily responsible for resisting posterolateral rotatory instability?





Explanation

The Lateral Ulnar Collateral Ligament (LUCL) is the primary static stabilizer preventing posterolateral rotatory instability of the elbow. Injury to the LUCL allows the ulna to rotate externally and subluxate posterolaterally on the capitellum, especially in supination and valgus stress. The anterior bundle of the medial collateral ligament is the primary valgus stabilizer. The annular ligament stabilizes the radial head but is not the primary restraint to PLRI. The posterior bundle of the MCL contributes to valgus stability but is less critical than the anterior bundle. The radial collateral ligament is part of the lateral collateral ligament complex but the LUCL is the specific component preventing PLRI.

Question 2

A 68-year-old female sustains a comminuted, intra-articular distal humerus fracture (AO type C3). She has significant osteopenia. What is generally considered the most appropriate surgical approach for definitive fixation in this patient?





Explanation

For a comminuted, intra-articular distal humerus fracture (C3 type) in an elderly patient with significant osteopenia, Total Elbow Arthroplasty (TEA) often provides superior outcomes compared to ORIF. ORIF in this setting can be challenging due to poor bone quality leading to screw cutout, high rates of nonunion, and stiffness. While ORIF via a transolecranon approach is a common method for C-type fractures, the osteopenia makes arthroplasty a more predictable option for early mobilization and functional recovery. Excision and sling is inadequate for an active individual. External fixation is typically a temporizing measure. A medial approach is not ideal for complex distal humerus fractures.

Question 3

A 32-year-old professional baseball pitcher presents with chronic medial elbow pain and valgus instability. MRI shows a complete tear of the ulnar collateral ligament (UCL). He desires to return to pitching. What is the most common graft used for UCL reconstruction (Tommy John surgery)?





Explanation

The semitendinosus autograft is the most commonly used graft for ulnar collateral ligament (UCL) reconstruction (Tommy John surgery) due to its sufficient length, strength, and low donor site morbidity. Palmaris longus is also frequently used if present and of adequate size. Patellar tendon and Achilles tendon grafts are typically reserved for larger joints like the knee or ankle. Peroneus longus is less commonly used. Flexor carpi radialis is another potential option but semitendinosus is generally preferred and more common.

Question 4

Regarding the 'terrible triad' injury of the elbow, which of the following statements is TRUE?





Explanation

The 'terrible triad' injury of the elbow consists of a posterior elbow dislocation, a radial head fracture, and a coronoid process fracture. Surgical management aims to restore stability and involves repair of the lateral collateral ligament (LCL) complex (specifically the LUCL), fixation or replacement of the radial head, and fixation of the coronoid fracture. Early motion is crucial post-operatively to prevent stiffness, not prolonged immobilization. The coronoid fracture can vary in size and type; it is not always a large Type III fracture.

Question 5

A 55-year-old male undergoes open reduction and internal fixation (ORIF) of a comminuted olecranon fracture. Post-operatively, he develops a dropped wrist and sensory loss in the dorsum of the hand. Which nerve injury is most likely?





Explanation

A 'dropped wrist' and sensory loss on the dorsum of the hand are classic signs of radial nerve palsy. The radial nerve courses closely to the posterior aspect of the humerus and elbow joint, making it susceptible to injury during olecranon fracture fixation, especially with plating or extensive dissection. Ulnar nerve injury would cause clawing of the hand and sensory loss in the medial digits. Median nerve injury would affect forearm pronation, thumb opposition, and sensation in the radial digits. Musculocutaneous nerve injury affects elbow flexion. Anterior interosseous nerve injury specifically affects the flexor pollicis longus and flexor digitorum profundus to the index and middle fingers, leading to loss of the 'OK' sign.

Question 6

What is the primary function of the anconeus muscle in elbow kinematics?





Explanation

The anconeus muscle is a small muscle located on the posterolateral aspect of the elbow. Its primary function is to assist the triceps in elbow extension and to stabilize the ulna, particularly during pronation and supination movements, preventing medial displacement of the ulna. It is not a primary flexor, supinator, or pronator.

Question 7

A 10-year-old child falls on an outstretched hand and sustains a supracondylar humerus fracture. Radiographs show significant displacement with an intact radial pulse but a pale, pulseless hand upon examination in the emergency department. Which is the MOST appropriate initial management step?





Explanation

In a supracondylar humerus fracture with signs of vascular compromise (pale, pulseless hand), the immediate priority is to restore perfusion. The most appropriate initial step is to attempt a gentle closed reduction under sedation. If perfusion is restored after reduction, then percutaneous pinning can proceed. If perfusion does not return after a successful reduction, or if the initial reduction is unsuccessful, then emergent surgical exploration of the brachial artery is indicated. Immediate surgical exploration without attempting reduction first is generally not recommended, as the vessel may be kinked or entrapped, not necessarily transected. An arteriogram takes too long in an emergent situation with active ischemia. Observation is inappropriate. Immediate pinning without addressing the vascular status is also incorrect.

Question 8

What is the normal carrying angle of the elbow in adults, and how does it typically differ between sexes?





Explanation

The normal carrying angle of the elbow is typically 5-15 degrees of valgus. This angle is generally slightly greater in females (around 10-15 degrees) than in males (around 5-10 degrees). The carrying angle allows the forearm to clear the hips during walking. Varus deformity is abnormal. Options indicating varus or no consistent angle are incorrect.

Question 9

A 28-year-old construction worker presents with insidious onset of pain and paresthesias in his little finger and ulnar half of the ring finger, particularly at night and with elbow flexion. Tinel's sign is positive at the cubital tunnel. What is the most common cause of cubital tunnel syndrome?





Explanation

The most common site of compression for the ulnar nerve in cubital tunnel syndrome is beneath the aponeurosis of the flexor carpi ulnaris (also known as the cubital tunnel retinaculum or Osborne's ligament). Other potential sites of compression include the arcade of Struthers (proximal to the elbow), subluxation of the nerve, anconeus epitrochlearis, and fibrous bands. Guyon's canal is at the wrist. While direct trauma can cause it, compression by the FCU aponeurosis is the most prevalent anatomical cause of entrapment. Subluxation can contribute but is often a consequence or a coexisting factor with compression.

Question 10

Which of the following describes the most common type of radial head fracture according to the Mason-Hotchkiss classification?





Explanation

Type I radial head fractures (nondisplaced or minimally displaced) are the most common type, accounting for approximately 50% of all radial head fractures. They are typically managed conservatively. Type II involves displaced but reconstructible fragments, Type III is comminuted and often non-reconstructible, and Type IV (Hotchkiss modification) adds associated elbow dislocation.

Question 11

A 50-year-old male presents with sudden onset of severe anterior elbow pain and a palpable 'Popeye' deformity in his arm after attempting to lift a heavy object. Examination reveals weakness in forearm supination and elbow flexion. What is the most appropriate management?





Explanation

The clinical presentation (sudden severe anterior elbow pain, 'Popeye' deformity, weakness in supination and elbow flexion) is classic for a distal biceps tendon rupture. For active individuals, especially those requiring strength in supination and flexion, surgical repair of the distal biceps tendon is the most appropriate management to restore strength and prevent chronic weakness. Non-operative management leads to significant loss of supination strength (up to 50%) and flexion strength. Injections are contraindicated in ruptures. Diagnostic arthroscopy is not the primary management.

Question 12

What is the typical carrying angle range for the elbow?





Explanation

The carrying angle is the angle formed by the long axis of the humerus and the long axis of the ulna with the elbow in extension and the forearm in supination. A normal carrying angle is typically 5-15 degrees of valgus. An angle outside this range, especially a varus angle, can indicate a pathological condition.

Question 13

Which of the following ligaments is considered the primary static stabilizer against valgus stress at the elbow?





Explanation

The anterior bundle of the medial collateral ligament (AMCL) is the primary static stabilizer against valgus stress at the elbow. It is taut throughout the entire range of motion, providing significant resistance to medial opening of the joint. The LUCL is crucial for posterolateral rotatory stability. The radial collateral and annular ligaments contribute to lateral stability but not valgus. The posterior bundle of the MCL contributes to valgus stability at extremes of flexion but is secondary to the AMCL.

Question 14

A 7-year-old child presents with a 'pulled elbow' (Nursemaid's elbow). What is the underlying pathology?





Explanation

Nursemaid's elbow, or radial head subluxation, occurs when the radial head slips out from under the annular ligament, usually due to a sudden pull on the child's extended and pronated arm. It is a subluxation, not a complete dislocation of the radiocapitellar joint. The annular ligament becomes trapped between the radial head and capitellum. It is not a fracture or ligament tear.

Question 15

In a patient presenting with refractory lateral epicondylitis (tennis elbow), what is the primary pathology targeted by surgical intervention?





Explanation

While historically called 'epicondylitis' suggesting inflammation, the primary pathology in chronic lateral epicondylitis is actually degeneration and angiofibroblastic hyperplasia (tendinosis) of the origin of the extensor carpi radialis brevis (ECRB) tendon, with minimal inflammatory cells. Surgical interventions typically involve debridement of this degenerated tissue. Other options represent different pathologies or less common features.

Question 16

What is the typical presentation of a patient with posterior interosseous nerve (PIN) syndrome?





Explanation

Posterior interosseous nerve (PIN) syndrome is a purely motor neuropathy characterized by weakness in the muscles it innervates, primarily the extensors of the fingers and thumb. This leads to an inability to extend the metacarpophalangeal joints of the fingers and the interphalangeal joint of the thumb, often described as 'finger drop' or 'thumb drop.' Sensory loss is typically absent because the PIN is a motor nerve. 'Wrist drop' is more indicative of a more proximal radial nerve lesion. Other options describe ulnar, median, or more global radial nerve palsies.

Question 17

A patient undergoes total elbow arthroplasty (TEA) for severe rheumatoid arthritis. What is a key contraindication for this procedure?





Explanation

Active infection in the elbow joint is an absolute contraindication for total elbow arthroplasty due to the high risk of periprosthetic joint infection, which can be devastating. While high functional demands (heavy manual labor) are a relative contraindication due to the risk of implant loosening and failure, it's not an absolute contraindication like active infection. Age is generally not a contraindication in elderly, low-demand patients. Previous arthroscopy or ipsilateral wrist arthritis are not contraindications.

Question 18

Which of the following describes the anatomical landmark for identifying the ulnar nerve during an elbow surgical approach?





Explanation

The ulnar nerve is consistently located posterior to the medial epicondyle as it passes through the cubital tunnel. This is a critical anatomical landmark for both identification and protection during surgical approaches to the medial elbow. Its position makes it vulnerable to compression and injury. The radial nerve passes through the supinator (arcade of Frohse), and the median nerve is anterior in the cubital fossa.

Question 19

What is the primary goal of surgical management for elbow stiffness and contracture?





Explanation

The primary goal of surgical management for elbow stiffness is to achieve a functional arc of motion, typically considered to be approximately 30-130 degrees of flexion/extension. This range allows most activities of daily living. While achieving full range is ideal, it is often not realistic or necessary. Resecting HO is often part of the procedure, but the goal is functional motion. Prolonged immobilization is detrimental, early motion is key. TEA is reserved for end-stage arthritis or complex unreconstructible trauma.

Question 20

A 40-year-old male presents with persistent elbow instability following a complex elbow dislocation that was managed non-operatively. Radiographs reveal chronic instability and articular damage. Which of the following conditions would make him a poor candidate for a simple ligamentous repair and would push toward a more complex reconstruction or arthroplasty?





Explanation

Significant articular cartilage loss and established osteoarthritic changes are poor prognostic indicators for simple ligamentous repair and often preclude it as a standalone solution for instability. The joint surface itself is compromised, leading to pain and dysfunction even if stability is restored. In such cases, interposition arthroplasty, total elbow arthroplasty, or possibly an ulnohumeral arthroplasty might be considered depending on the extent of damage and patient factors. Mild varus or isolated LUCL insufficiency without significant arthritis would still be amenable to reconstructive procedures. Heterotopic ossification, while often present, doesn't directly preclude ligament repair but can complicate it.

Question 21

What is the primary vascular supply to the anterior compartment of the forearm, distal to the elbow?





Explanation

Distal to the elbow, the brachial artery typically bifurcates into the radial and ulnar arteries. These two major arteries, along with their numerous branches (recurrent arteries, interosseous arteries), provide the primary vascular supply to the entire forearm, including the anterior compartment. The profunda brachii artery is a branch of the brachial artery more proximally in the arm. The superior ulnar collateral artery is a branch in the arm. Recurrent arteries are typically branches of the radial and ulnar arteries themselves, and the posterior interosseous artery is a branch of the common interosseous, which itself is a branch of the ulnar artery.

Question 22

Which muscle is most commonly implicated in medial epicondylitis (golfer's elbow)?





Explanation

Medial epicondylitis, or golfer's elbow, is an overuse injury affecting the common flexor-pronator origin at the medial epicondyle. The pronator teres and flexor carpi radialis are the most commonly involved muscles. The extensor carpi radialis brevis is involved in lateral epicondylitis. Supinator, biceps, and triceps are not primarily implicated in medial epicondylitis.

Question 23

A 25-year-old male sustains a comminuted radial head fracture (Mason Type III) with an associated MCL injury and elbow dislocation (terrible triad). What is the preferred treatment for the radial head component in this active patient?





Explanation

In a terrible triad injury with a comminuted, unreconstructible radial head fracture (Mason Type III) in an active patient, radial head arthroplasty is generally the preferred treatment. Excision of the radial head in the setting of a terrible triad can lead to persistent valgus instability and proximal migration of the radius. ORIF is ideal for reconstructible fractures (Mason Type II), but not for Type III comminution. Long-term immobilization is detrimental for elbow function. Percutaneous pinning is typically for very simple, minimally displaced fractures, not comminuted ones.

Question 24

What is the characteristic radiographic finding in osteochondritis dissecans (OCD) of the capitellum?





Explanation

Osteochondritis dissecans (OCD) of the capitellum is an idiopathic aseptic necrosis of the subchondral bone, primarily affecting young athletes (e.g., gymnasts, baseball pitchers). Radiographically, it is characterized by sclerosis, fragmentation, and potential loosening of a segment of the capitellar articular surface. Other options describe different pathologies or non-specific findings.

Question 25

Which of the following describes the 'arcade of Frohse' and its clinical significance?





Explanation

The arcade of Frohse is a fibrous arch formed by the superficial head of the supinator muscle. It is a common site of compression for the posterior interosseous nerve (PIN), leading to PIN syndrome, characterized by motor weakness in the finger and thumb extensors without sensory deficits. The cubital tunnel retinaculum (Osborne's ligament) compresses the ulnar nerve. Pronator syndrome involves the median nerve, and the common flexor tendon is involved in medial epicondylitis.

Question 26

A 60-year-old male with long-standing rheumatoid arthritis presents with increasing elbow pain, stiffness, and instability. Radiographs show severe destruction of the ulnohumeral and radiocapitellar joints. What is the most appropriate surgical option to improve function and reduce pain?





Explanation

For severe, destructive rheumatoid arthritis of the elbow with pain, stiffness, and instability, Total Elbow Arthroplasty (TEA) is the most appropriate surgical option. It reliably provides pain relief, improves motion, and restores stability in this patient population, who typically have lower functional demands and poorer bone quality that makes other reconstructive options less suitable. Elbow arthrodesis is rarely performed. Excision and interposition arthroplasty have less predictable pain relief and stability. Debridement arthroscopy is for less severe, early-stage arthritis.

Question 27

Which of the following fractures is most commonly associated with ulnar nerve injury at the elbow?





Explanation

Fractures of the medial epicondyle are most commonly associated with ulnar nerve injury, as the nerve passes directly posterior to the epicondyle in the cubital tunnel. Its proximity makes it vulnerable to contusion, stretch, or entrapment. While ulnar nerve injury can occur with distal humerus or olecranon fractures, it is a hallmark association with medial epicondyle fractures, particularly in pediatric patients where it may be entrapped in the fracture site.

Question 28

What is the critical range of motion for elbow function in most activities of daily living?





Explanation

The functional arc of motion for the elbow, which allows for most activities of daily living (e.g., eating, personal hygiene, dressing), is generally considered to be 30 to 130 degrees of flexion/extension, with 50 degrees of pronation and 50 degrees of supination. Achieving a full range (0-150) is ideal but not always necessary or achievable. Ranges narrower than 30-130 often lead to significant functional limitations.

Question 29

A 12-year-old patient falls directly onto the tip of their elbow. Radiographs show a minimally displaced olecranon fracture. What is a common pitfall in diagnosing olecranon fractures in children?





Explanation

In children, the olecranon apophysis appears around age 9-10 and fuses by age 14-16. This normal growth plate can be mistaken for an olecranon fracture, especially if radiographs are not compared to the contralateral elbow. A true fracture line will be more irregular and often extends into the joint. Other options are less common or specific to olecranon fractures.

Question 30

Which structure forms the lateral border of the cubital fossa?





Explanation

The cubital fossa is a triangular space located anterior to the elbow joint. Its boundaries are: superiorly by an imaginary line connecting the medial and lateral epicondyles; medially by the pronator teres muscle; and laterally by the brachioradialis muscle. The floor is formed by the brachialis and supinator muscles, and the roof by the bicipital aponeurosis and skin. The biceps tendon passes through it. The epicondyles are superior landmarks.

Question 31

A patient presents with persistent pain and clicking in the elbow, especially with pronation and supination, after a radial head fracture treated non-operatively. Examination reveals tenderness over the radiocapitellar joint. What is a likely cause of these symptoms?





Explanation

Persistent pain and clicking after a radial head fracture, especially with pronation/supination, suggest issues with the radiocapitellar joint. This could be due to chondromalacia, osteochondral defects, or malunion of the radial head affecting articulation with the capitellum. UCL insufficiency would present as valgus instability. PIN entrapment is purely motor. Coronoid nonunion is less likely to cause clicking specific to pronation/supination. HO in the olecranon fossa would limit extension/flexion, not primarily clicking with rotation.

Question 32

What is the typical management for a minimally displaced, stable Type I coronoid fracture?





Explanation

Type I coronoid fractures (tip avulsion) are typically small, minimally displaced, and do not significantly compromise elbow stability on their own. They are commonly managed non-operatively with sling immobilization for comfort, followed by early protected range of motion to prevent stiffness while allowing healing. Larger, displaced coronoid fractures (Type II and III) or those associated with elbow instability (e.g., terrible triad) usually require surgical fixation.

Question 33

Which of the following is considered an absolute contraindication for elbow arthroscopy?





Explanation

Active infection in the joint is an absolute contraindication for any elective arthroscopic or open procedure due to the high risk of spreading the infection and leading to chronic septic arthritis. While severe osteoarthritic changes, previous surgery, or diffuse synovitis can make arthroscopy more challenging or less effective, they are not absolute contraindications. Loose bodies are an indication for arthroscopy.

Question 34

A 35-year-old male presents with persistent elbow pain and inability to fully extend his elbow following a fall. Radiographs show heterotopic ossification (HO) in the anterior compartment. What is the most effective prophylactic measure against recurrent HO after surgical excision?





Explanation

After surgical excision of heterotopic ossification (HO) in the elbow, the most effective prophylactic measures against recurrence are post-operative radiation therapy (typically a single low dose) or a course of non-steroidal anti-inflammatory drugs (NSAIDs) like indomethacin. Early, active range of motion is also crucial. Prolonged immobilization can worsen stiffness and potentially exacerbate HO. Corticosteroids are not a standard prophylactic. Hyaluronic acid injections are for joint lubrication.

Question 35

What nerve is at highest risk of injury during a medial approach to the elbow?





Explanation

The ulnar nerve is located directly posterior to the medial epicondyle and within the cubital tunnel. Any medial approach to the elbow, especially those involving dissection around the medial epicondyle or the cubital tunnel, places the ulnar nerve at the highest risk of injury. Careful identification and protection of the nerve are paramount. The median nerve is more anterior. The radial and PIN are lateral/posterior. The musculocutaneous nerve is more anterior in the arm.

Question 36

A 10-year-old child presents with a lateral condyle fracture of the humerus. Which classification system is commonly used for this injury, and what is its primary focus?





Explanation

The Milch classification is commonly used for lateral condyle fractures of the humerus in children. It divides these fractures into Type I (fracture through the capitellar ossification center, stable) and Type II (fracture extending through the trochlea, less stable, usually involving the entire lateral condyle). The key distinction is the extent of articular involvement and stability, guiding treatment. Salter-Harris describes epiphyseal plate injuries in general but Milch is specific to lateral condyle. AO and Mason are for adults, O'Driscoll for coronoid.

Question 37

What is the typical mechanism of injury for a Monteggia fracture-dislocation?





Explanation

A Monteggia fracture-dislocation typically results from a fall on an outstretched hand with the forearm in pronation and an axial load, causing the ulna to fracture and the radial head to dislocate, usually anteriorly. The Bado classification describes four types based on the direction of radial head dislocation. Direct blows, supination falls, repetitive valgus stress, and hyperextension injuries are associated with other specific elbow pathologies.

Question 38

Which structure provides the most significant secondary stability to the elbow, particularly in valgus stress, when the primary stabilizer (AMCL) is compromised?





Explanation

The radial head and capitellum articulation provide significant secondary stability to the elbow, especially against valgus stress, once the primary stabilizer (anterior bundle of the medial collateral ligament) is compromised. This is why excision of the radial head in the setting of valgus instability (e.g., terrible triad) can exacerbate the instability. The other options contribute less directly or significantly to static valgus stability.

Question 39

A 4-year-old child presents with a minimally displaced medial epicondyle fracture. The ulnar nerve is intact, and the elbow is stable. What is the most appropriate management?





Explanation

Minimally displaced medial epicondyle fractures in children, especially when the ulnar nerve is intact and the elbow is stable, are typically managed non-operatively with sling immobilization and early protected range of motion. Surgical intervention is usually reserved for significant displacement (e.g., >1 cm or intra-articular entrapment), ulnar nerve entrapment, or elbow instability. Immobilization for too long can lead to stiffness.

Question 40

What is the primary function of the annular ligament of the elbow?





Explanation

The annular ligament encircles the radial head, holding it firmly in the radial notch of the ulna. This allows for pronation and supination of the forearm while preventing displacement of the radial head. It is not a primary restraint to varus or valgus stress, nor does it limit hyperextension, nor connect the olecranon to the medial epicondyle.

Question 41

Which of the following describes the anatomical course of the radial nerve at the elbow, making it vulnerable to certain injuries?





Explanation

The radial nerve divides into its superficial radial (sensory) and posterior interosseous (motor) branches within the cubital fossa, anterior to the lateral epicondyle and often piercing the supinator muscle (arcade of Frohse). This anatomical arrangement makes it vulnerable to injury during lateral elbow approaches, supracondylar fractures, or forearm trauma. The ulnar nerve is posterior to the medial epicondyle. The median nerve is medial to the brachial artery.

Question 42

In the setting of a complex elbow dislocation, what is the significance of a Type III coronoid fracture (O'Driscoll classification)?





Explanation

O'Driscoll Type III coronoid fractures involve a large portion (greater than 50%) of the coronoid height. Such extensive involvement significantly compromises the ulnohumeral articulation, leading to gross instability of the elbow, especially in posterior dislocations. These fractures almost always require surgical fixation to restore stability. Type I is a tip avulsion, Type II is intermediate (10-50%).

Question 43

What is the most common complication following distal biceps tendon repair?





Explanation

Heterotopic ossification (HO) is the most common complication following distal biceps tendon repair, particularly with two-incision approaches or extensive dissection. Careful surgical technique, atraumatic handling, and post-operative prophylaxis (e.g., NSAIDs or radiation) can reduce its incidence. Re-rupture is uncommon with good repair. Ulnar and PIN palsies are less common than HO but can occur with nerve retraction or direct injury. Loss of elbow flexion is rare if repair is done correctly.

Question 44

What is the primary role of the common extensor origin in elbow stability?





Explanation

The common extensor origin, along with the other soft tissues of the lateral elbow, provides secondary static stability against varus stress. When the radial collateral ligament (RCL) complex is deficient, these tendinous origins can contribute to preventing excessive varus gapping. The LUCL is the primary static restraint to varus. It is not a dynamic stabilizer against valgus stress.

Question 45

A patient with a history of elbow trauma presents with a fixed flexion deformity of 40 degrees and inability to supinate beyond neutral. Radiographs show a congruent joint with no loose bodies. What is the most appropriate surgical approach for a capsular release in this patient?





Explanation

For severe, fixed flexion deformities and significant loss of forearm rotation at the elbow, a combined medial and lateral approach is often required. This allows for comprehensive release of both the anterior and posterior capsule (often through a single posterior incision with lateral and medial extensions or separate incisions), excision of heterotopic ossification, and neurolysis of the ulnar nerve if needed. Isolated lateral or medial approaches are insufficient for global contracture. An anterior approach to release the median nerve is not the primary target for contracture release.

Question 46

What is the most effective initial management for acute simple elbow dislocation (without associated fractures)?





Explanation

The most effective initial management for acute simple elbow dislocations is prompt closed reduction. After reduction, stability should be assessed (often under fluoroscopy). If stable, early protected range of motion is crucial to prevent stiffness, typically within a functional brace. Prolonged immobilization (e.g., 6 weeks) is detrimental due to the high risk of severe stiffness and heterotopic ossification. Surgical exploration or external fixation is reserved for irreducible dislocations or those with associated unstable fractures.

Question 47

Which of the following statements regarding the posterior interosseous nerve (PIN) is TRUE?





Explanation

The posterior interosseous nerve (PIN) is a purely motor nerve, branching from the radial nerve within the cubital fossa. It innervates the extrinsic extensors of the fingers and thumb, as well as the extensor carpi ulnaris and supinator. The superficial radial nerve provides sensory innervation. The radial nerve itself innervates the brachioradialis and ECRL (before it splits). A 'wrist drop' is typically associated with a more proximal radial nerve lesion, as the PIN lesion would preserve wrist extension through ECRL and ECPL (radial-innervated muscles before PIN branch).

Question 48

What is the primary concern when managing a displaced lateral condyle fracture of the humerus in a 6-year-old child?





Explanation

Displaced lateral condyle fractures in children are prone to nonunion, especially if not adequately fixed. A nonunion of the lateral condyle can lead to a progressive cubitus valgus deformity, which can then cause a delayed ulnar nerve palsy (tardy ulnar palsy). Therefore, preventing nonunion and subsequent deformity is a primary concern. Nerve and vascular injuries are less common than with supracondylar fractures. PLRI is associated with LUCL injury.

Question 49

What is the most significant disadvantage of using a hinged external fixator for elbow instability?





Explanation

While hinged external fixators allow early range of motion, a significant disadvantage is the high risk of pin tract infection, which can lead to osteomyelitis or necessitate early removal. They are often used after closed or open reduction has restored joint congruity. They do not intrinsically prolong immobilization if designed to allow motion.

Question 50

A 50-year-old male with chronic lateral epicondylitis fails extensive conservative management. Surgical options include open release or arthroscopic debridement. What is the main benefit of arthroscopic over open release for this condition?





Explanation

The main benefit of arthroscopic treatment for lateral epicondylitis over open release is the ability to diagnose and treat concomitant intra-articular pathologies, such as plica, synovitis, loose bodies, or chondral lesions, which can contribute to persistent elbow pain. While some patients may experience a less invasive feeling, long-term outcomes are generally comparable, and the risk of nerve injury can actually be higher with arthroscopy if not performed meticulously. Recovery speed varies.

Question 51

In an anterior approach to the elbow, which major neurovascular structure is located medially and is at risk?





Explanation

In an anterior approach to the elbow (e.g., for distal humerus fractures or contracture release), the median nerve and brachial artery run together in the medial aspect of the antecubital fossa and are the primary neurovascular structures at risk. They should be identified and protected. The ulnar nerve is more medial and posterior. The radial nerve and its branches are more lateral.

Question 52

What is the most common cause of recurrent elbow instability after surgical repair of a terrible triad injury?





Explanation

The most common cause of recurrent instability following surgical management of a terrible triad injury is inadequate fixation or replacement of the radial head. The radial head plays a crucial role as a secondary stabilizer, especially against valgus stress. If it is not adequately addressed (either by stable fixation or appropriate replacement), valgus instability can persist or recur, leading to failure of the entire construct. While MCL repair is important, the radial head's contribution to stability is often underestimated. Coronoid nonunion is also possible but often secondary to overall instability. Excessive early mobilization can contribute but if the fix is strong, it's less likely the primary cause.

Question 53

A patient is undergoing surgical repair of a distal biceps tendon rupture using a single anterior incision. Which nerve is most at risk during the drilling of the radial tuberosity for tendon reinsertion?





Explanation

When performing a single anterior incision approach for distal biceps tendon repair, especially during drilling or placing anchors into the radial tuberosity, the posterior interosseous nerve (PIN) is at significant risk. The PIN wraps around the radial neck and passes through the supinator muscle, which lies directly over the radial tuberosity. Hyperpronation of the forearm during the procedure is critical to move the PIN away from the drilling path. The median and AIN are more medial, the ulnar nerve is posterior, and the lateral cutaneous nerve of the forearm is superficial and sensory.

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