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Orthopedic Board Prep: Interactive Viva Exam Practice for Trauma & Surgical Cases

Ace FRCS: Olecranon Fractures Trauma Case Walkthrough

23 Apr 2026 82 min read 130 Views
Illustration of olecranon fractures trauma - Dr. Mohammed Hutaif

Key Takeaway

Looking for accurate information on Ace FRCS: Olecranon Fractures Trauma Case Walkthrough? Olecranon fractures trauma involves breaks in the elbow's olecranon bone, often comminuted and displaced from injuries like falls. Management includes initial assessment for soft tissue damage and neurovascular deficits, pain relief, and immobilization. Definitive treatment frequently involves surgery, with plate fixation preferred for complex patterns and tension band wiring for simple, proximal fractures.

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Question 1

A 45-year-old male sustains a direct fall onto his elbow, resulting in a displaced olecranon fracture. Which of the following structures is least likely to be directly involved in the primary function of the olecranon as an anatomical structure and lever arm for extension?





Explanation

The olecranon serves as the primary insertion point for the triceps brachii tendon (A), forming a critical lever arm for elbow extension. The anconeus muscle (B) originates from the lateral epicondyle and inserts onto the lateral aspect of the olecranon and proximal ulna, assisting in extension and stabilizing the ulnohumeral joint. The joint capsule (C) encompasses the ulnohumeral joint, and its integrity is often compromised in intra-articular fractures. The ulnar nerve (E) runs in the cubital tunnel posterior to the medial epicondyle, making it vulnerable to injury with olecranon fractures or surgical approaches. The radial collateral ligament (D) is located laterally and stabilizes the humeroradial and proximal ulnar joints against varus stress, having a less direct role in the primary function of the olecranon's lever arm for extension compared to the other options. While indirect involvement or associated injury is possible, its direct contribution to the olecranon's lever arm function is less central.

Question 2

A 68-year-old female presents with an olecranon fracture classified as Mayo Type IIB. Which characteristic best describes this specific fracture pattern?





Explanation

The Mayo Classification for olecranon fractures categorizes them based on displacement, stability, and comminution. Type II fractures are displaced. Subtype IIB specifically denotes a displaced, comminuted, yet stable fracture. Stability implies the ulnohumeral joint remains congruent despite the fracture, meaning the fracture is not associated with elbow instability or dislocation.

Question 3

A patient falls directly onto the point of their elbow. Which of the following olecranon fracture patterns is most commonly associated with this mechanism?





Explanation

A direct fall onto the point of the elbow typically results in high-energy trauma, driving the olecranon directly against the trochlea. This commonly leads to highly comminuted fractures with significant articular involvement (C) due to the crushing force. Avulsion fractures (D) are more often due to indirect mechanisms (sudden triceps contraction). Transverse non-displaced fractures (A) or simple oblique fractures (B) can occur with direct trauma but are less characteristic of high-energy impact onto the olecranon apex. Anterior coronoid fractures (E) are often associated with posterior dislocations and varus posteromedial rotatory instability, not typically a direct impact mechanism to the olecranon apex itself.

Question 4

A 32-year-old male presents after a motorcycle accident with a suspected olecranon fracture. On examination, he has a visible deformity, swelling, and ecchymosis over the posterior elbow. He is unable to actively extend his elbow against gravity. What is the most critical initial finding to assess regarding ulnohumeral joint stability?





Explanation

While all options are important, the question specifically asks for the 'most critical initial finding to assess regarding ulnohumeral joint stability' in the context of a suspected olecranon fracture. A palpable gap at the fracture site (B) directly indicates significant displacement of the olecranon, which often correlates with profound disruption of the triceps mechanism and compromise of the ulnohumeral joint's posterior stability. The inability to actively extend the elbow against gravity is already mentioned, which points to disruption. Varus/valgus stress testing (D) assesses collateral ligament integrity, which is important, but a displaced olecranon fragment itself significantly compromises the posterior stability. Assessment of ulnar nerve function (C) and distal neurovascular status (E) are crucial for managing complications but do not directly assess ulnohumeral mechanical stability related to the fracture pattern itself. Passive elbow flexion (A) provides information about potential stiffness but not acute stability.

Question 5

A 55-year-old patient presents with an olecranon fracture. Standard AP and lateral radiographs show a transverse, displaced fracture. What additional radiographic view is most beneficial for further characterization, particularly to assess comminution and articular involvement?





Explanation

While standard AP and lateral views are essential, oblique views (B) provide additional perspectives that can be invaluable. They help to better delineate the fracture pattern, identify comminution not clearly seen on orthogonal views, and assess the extent of articular involvement (e.g., small intra-articular fragments or subtle step-offs). This detailed information is crucial for surgical planning. Radial head-capitellum view (A) is for radial head fractures. Axillary view (C) is typically for shoulder dislocations. Stress views (D) assess ligamentous instability. Contralateral views (E) are for comparing anatomical variations or growth plate status in children.

Question 6

Which of the following conditions is an absolute contraindication to non-operative management of an olecranon fracture?





Explanation

An open fracture (D) with a breach in the skin over the fracture site is an absolute contraindication to non-operative management. This is due to the extremely high risk of infection, requiring urgent surgical debridement, irrigation, antibiotics, and stabilization. Patient preference (A) is a relative factor. An elderly, low-demand patient (B) or a completely non-displaced fracture (C) are typically indications for non-operative management. Mild comminution without articular step-off (E) can sometimes be managed non-operatively, especially if stable and nondisplaced.

Question 7

A 40-year-old healthy male sustains a simple transverse, displaced olecranon fracture with intact articular surface. Which surgical technique is generally considered the gold standard for fixation in this scenario?





Explanation

For simple transverse, displaced olecranon fractures (especially Mayo Type IIA) with intact articular surface and good bone stock, tension band wiring (D) is considered the gold standard. It effectively converts tensile forces from the triceps pull into compressive forces at the fracture site, promoting healing and allowing for early mobilization. Plate and screw fixation (A) is preferred for comminuted fractures, unstable fractures, or osteoporotic bone. Intramedullary screw fixation (B) has limited, specific indications. Excision of the proximal fragment (C) is reserved for very small, distal fragments in low-demand patients or severely comminuted segments that cannot be reconstructed. Total elbow arthroplasty (E) is a salvage procedure for highly complex, unreconstructable fractures, especially in the elderly.

Question 8

When considering plate fixation for an olecranon fracture, which of the following scenarios would most strongly indicate a locking plate over a conventional compression plate?





Explanation

Locking plates provide angular stability independent of plate-bone compression, making them particularly advantageous in osteoporotic bone or highly comminuted fractures (C) where conventional screw purchase may be inadequate. In these cases, locking screws 'lock' into the plate, creating a fixed-angle construct that resists collapse and provides stable fixation even with poor bone quality. Simple transverse (A) or oblique fractures (B) in good bone quality often respond well to tension band wiring or conventional compression plating. Avulsion fractures (D) are typically managed with tension band wiring or direct suture. Distal ulna shaft extension (E) would indicate a longer plate but not necessarily a locking plate without other factors.

Question 9

Following surgical fixation of an olecranon fracture, what is the most common long-term complication reported?





Explanation

Stiffness and loss of range of motion, particularly extension, is the most common long-term complication following olecranon fracture fixation, occurring in a significant percentage of patients. While nonunion (A), ulnar nerve neuropathy (B), infection (C), and hardware failure (E) can occur, elbow stiffness is a near-universal concern that requires diligent rehabilitation and patient compliance to minimize its impact.

Question 10

During surgical exposure for an olecranon fracture, the ulnar nerve is identified. What is the most appropriate management strategy if the nerve is found to be intact but compressed by surrounding hematoma or scar tissue, especially in a fracture requiring internal fixation?





Explanation

If the ulnar nerve is found to be compressed or at high risk of post-operative compression/irritation (e.g., due to hardware placement or significant swelling, or pre-existing cubital tunnel syndrome), anterior transposition (C) is often performed prophylactically or therapeutically. This moves the nerve out of the cubital tunnel and into a less constrained anterior position, reducing the risk of neuropathy. Neurolysis in situ (B) may be considered for milder cases but is less definitive if significant risk factors for ongoing compression are present. No intervention (A) would be inappropriate if compression is present or anticipated. Posterior interosseous nerve release (D) is for radial nerve issues. Immediate nerve graft (E) is for transected nerves.

Question 11

A patient with an olecranon fracture reports persistent pain and mechanical symptoms in the forearm despite adequate fixation of the olecranon. Physical examination reveals tenderness over the radial head and pain with forearm rotation. What associated injury should be most strongly suspected?





Explanation

Persistent forearm pain, tenderness over the radial head, and pain with forearm rotation after an olecranon fracture raises strong suspicion for an Essex-Lopresti injury (C). This injury involves a radial head fracture, rupture of the interosseous membrane, and disruption of the distal radioulnar joint (DRUJ), often associated with a coronoid or olecranon fracture as part of a high-energy elbow trauma. A Monteggia fracture-dislocation (B) involves an ulna shaft fracture with radial head dislocation, which is a distinct pattern. Distal humerus fracture (A) would typically present with different pain patterns. Medial collateral ligament (D) tear typically presents with valgus instability. Triceps tendon rupture (E) would impact extension, not forearm rotation or radial head pain.

Question 12

Following successful tension band wiring of a simple transverse olecranon fracture, what is the most appropriate initial post-operative rehabilitation protocol?





Explanation

Early controlled active and passive range of motion (C) within pain limits is crucial to prevent stiffness and promote articular cartilage health after olecranon fracture fixation. The stability provided by tension band wiring allows for this early motion. Immediate full active range of motion (A) may risk displacement. Prolonged immobilization (B) leads to severe stiffness and is generally avoided. CPM (D) can be used, but not typically 24/7 and usually as an adjunct to active/passive motion, not the sole therapy. Immediate strengthening (E) is too aggressive and could disrupt the repair.

Question 13

A patient complains of persistent pain and irritation over the posterior aspect of the elbow six months after olecranon fracture fixation with tension band wiring. Radiographs show healed fracture and intact hardware. What is the most likely cause of symptoms?





Explanation

Hardware prominence and irritation (C) is an extremely common complication following olecranon tension band wiring, occurring in up to 80% of cases due to the superficial location of the olecranon and its hardware. It often necessitates hardware removal once the fracture has healed, as is indicated by 'healed fracture and intact hardware'. Nonunion (A) would typically present with persistent pain, instability, and poor healing on radiographs. Infection (B) would show signs of inflammation. Ulnar nerve entrapment (D) causes specific neurological symptoms. Post-traumatic arthritis (E) is a longer-term complication, typically manifesting years later, and while hardware can contribute, direct irritation is a more immediate and common cause for symptoms at 6 months post-op with a healed fracture.

Question 14

In which of the following scenarios might excision of the olecranon fragment be a viable treatment option?





Explanation

Excision of the olecranon fragment is typically reserved for small, distal fragments (representing <50% of the articular surface, often <2cm), particularly in elderly, low-demand patients (C) where reconstruction is difficult or unnecessary. This approach aims to restore triceps function without requiring complex hardware. For larger fragments or in active patients (A, D), fixation is preferred to restore the triceps lever arm and joint stability. Nondisplaced fractures (B) are managed non-operatively or with simpler fixation. Open fractures with significant bone loss (E) may require more complex reconstructive techniques or external fixation, not simple excision.

Question 15

The principle behind tension band wiring for olecranon fractures is to convert which type of force into a compressive force at the fracture site?





Explanation

Tension band wiring works by converting the tensile forces (D) exerted by the triceps muscle contraction (which normally would distract the fracture) into compressive forces at the fracture site. This allows for active range of motion without distraction, promoting bone healing and stability.

Question 16

A patient presents with a Mayo Type IIIB olecranon fracture. What is a defining characteristic of this type that dictates management?





Explanation

Mayo Type IIIB signifies a displaced, comminuted, and unstable olecranon fracture. The 'B' denotes comminution, and the 'III' denotes instability. Instability implies compromise of the ulnohumeral articulation (often due to associated ligamentous or coronoid injury), which often requires more robust fixation than tension band wiring, such as plate fixation, to restore joint congruence and stability.

Question 17

During a posterior approach to the elbow for olecranon fracture fixation, the ulnar nerve is typically located in which anatomical relationship to the medial epicondyle?





Explanation

The ulnar nerve runs in the cubital tunnel, which is located posterior and medial (D) to the medial epicondyle of the humerus. This makes it vulnerable to injury during a posterior surgical approach to the olecranon, requiring careful identification and protection.

Question 18

For a highly comminuted olecranon fracture in an active 30-year-old patient, which treatment option is generally preferred over tension band wiring?





Explanation

For highly comminuted olecranon fractures, especially in young, active individuals where anatomical reconstruction and stable fixation are paramount, plate and screw fixation (C) is preferred. It provides greater stability, allows for anatomical reconstruction of the articular surface, and better maintains fragment alignment, which is critical for long-term function. Tension band wiring is less effective for comminuted fractures as it relies on good bone stock for effective compression. Excision (A) is for small fragments in low-demand patients. Cast immobilization (B) is non-operative and unsuitable for displaced comminuted fractures. Intramedullary screw fixation (D) has limited indications and may not address comminution effectively. Total elbow arthroplasty (E) is a salvage procedure.

Question 19

Which of the following factors is least likely to contribute to an increased risk of nonunion following operative fixation of an olecranon fracture?





Explanation

Early, controlled rehabilitation (D) is generally beneficial for fracture healing by promoting joint motion, reducing stiffness, and stimulating bone biology, not typically a cause of nonunion unless it leads to hardware failure or significant displacement due to uncontrolled motion. However, 'aggressive' in this context could be ambiguous, but compared to the other options, it's the least likely direct cause. Factors like smoking (A), high-energy comminution (B), inadequate fixation (C), and malnutrition (E) are well-known, direct risk factors for nonunion.

Question 20

The articular surface of the olecranon forms part of which joint?





Explanation

The articular surface of the olecranon forms the proximal portion of the trochlear notch, which articulates with the trochlea of the humerus to form the ulnohumeral joint (D). This is the primary articulation responsible for elbow flexion and extension.

Question 21

A 42-year-old presents with a Gustilo-Anderson Type II open olecranon fracture. Initial management steps prior to definitive fixation should include:





Explanation

Management of open fractures (B) requires urgent surgical debridement and copious irrigation, broad-spectrum intravenous antibiotics, and tetanus prophylaxis to prevent infection, often within 6-8 hours. Total elbow arthroplasty (A) is a definitive procedure and not initial management. Closed reduction and casting (C) is inappropriate for an open fracture. Delayed primary closure without debridement (D) is incorrect; debridement is paramount. CPM (E) is for post-operative rehabilitation, not acute open fracture management.

Question 22

Plate and screw fixation for comminuted olecranon fractures primarily provides stability through what mechanism?





Explanation

Plate and screw fixation for comminuted fractures primarily acts as a neutralization, buttress, or bridging construct (C). Neutralization plates protect screws from bending, shear, and rotational forces. Buttress plates prevent fragment collapse. Bridging plates span comminuted segments, maintaining length and alignment. Tension band wiring (A) is for simple fractures. Intramedullary fixation (B) is a different method. Distraction osteogenesis (D) is for lengthening. External compression (E) is typically from external fixators or specific compression plate designs used for simple fractures.

Question 23

In pre-operative planning for a complex olecranon fracture, what imaging modality offers the most detailed assessment of articular congruity and fragment orientation, particularly for surgical reduction and fixation strategy?





Explanation

A CT scan with 3D reconstruction (C) provides the most detailed information regarding the extent of comminution, articular step-off, fragment size and orientation, and overall joint congruity. This is invaluable for surgical planning, especially for complex or intra-articular fractures. Plain radiographs (A) are initial. MRI (B) is better for soft tissues. Ultrasound (D) and bone scan (E) are less useful for bony detail in acute fracture assessment.

Question 24

Which of the following fracture patterns is a relative contraindication to tension band wiring?





Explanation

Highly comminuted olecranon fractures with poor bone stock (C) are a relative contraindication to tension band wiring. Tension band wiring relies on good bone purchase for the Kirschner wires and adequate compression. In highly comminuted fractures, especially with osteoporotic bone, stable fixation and compression may be difficult to achieve, leading to higher rates of failure and nonunion. Plate fixation is often preferred in such cases. The other options are generally well-suited for TBW if displaced.

Question 25

What specific maneuver is critical to perform during the closure of a posterior approach for olecranon fracture fixation, especially if the ulnar nerve was exposed or transposed?





Explanation

Ensuring a tension-free closure over the ulnar nerve (C) is paramount to prevent post-operative nerve irritation or entrapment. If the nerve has been transposed, it must be placed in a bed of soft tissue and not directly beneath skin or fascia under tension. Aggressive tightening of the triceps repair (E) can cause undue tension. The other options are not directly related to ulnar nerve protection during closure.

Question 26

The most significant factor contributing to the development of post-traumatic arthritis following an olecranon fracture is:





Explanation

Non-anatomic articular reduction with residual step-off or gap (C) is the most significant factor leading to post-traumatic arthritis. Any irregularity in the joint surface increases contact stress, disrupts normal biomechanics, and accelerates cartilage degeneration. While other factors contribute, articular incongruity is directly detrimental to long-term joint health.

Question 27

A patient with an olecranon fracture is unable to actively extend their elbow against gravity. This finding suggests disruption of which functional unit?





Explanation

The inability to actively extend the elbow against gravity is a hallmark sign of disruption to the triceps-olecranon lever arm mechanism (C). The triceps muscle inserts onto the olecranon, and an intact fracture with stable fixation (or an intact olecranon) is required for effective elbow extension. If this mechanism is disrupted (e.g., by a displaced olecranon fracture or triceps avulsion), active extension is severely compromised.

Question 28

When evaluating a patient with a suspected olecranon fracture in the emergency department, what is the single most important initial assessment to perform and document?





Explanation

In any acute trauma, especially involving the elbow (where major neurovascular structures are superficial and can be compromised by fracture fragments or swelling), a thorough assessment and documentation of distal neurovascular status (C) is the single most important initial step. This can identify limb-threatening conditions (e.g., compartment syndrome, vascular injury) or nerve palsies that require immediate attention. Fracture classification (A) is for later. Range of motion (B) and pain assessment (D) are important but secondary to neurovascular status. Tetanus history (E) is relevant for open fractures.

Question 29

How is a Mayo Type IA olecranon fracture typically managed?





Explanation

A Mayo Type IA fracture is a non-displaced, non-comminuted, and stable fracture. These are typically managed non-operatively (D) with a long arm cast or splint (often in about 45-90 degrees of flexion to relax the triceps), allowing for early controlled range of motion as pain permits, to prevent stiffness. Surgical options (A, B, C, E) are overkill for a stable, non-displaced fracture.

Question 30

What is the standard surgical approach for open reduction internal fixation of an olecranon fracture?





Explanation

The standard surgical approach for olecranon fractures is a posterior approach (C). This allows direct access to the olecranon, triceps tendon, and articular surface while carefully protecting the ulnar nerve, which is usually identified and mobilized medially.

Question 31

When performing tension band wiring, what is the critical orientation for the two Kirschner wires to ensure proper biomechanical function and prevent fracture gapping?





Explanation

For proper tension band wiring, the two Kirschner wires should be inserted parallel to each other in the proximal fragment, divergent proximally and then advanced distally to engage the anterior cortex of the ulna (C). This provides a stable construct and prevents rotation or pull-out of the proximal fragment. Placing them parallel (A) throughout or perpendicular (B) would be biomechanically unsound. Divergent proximally and convergent distally (D) would not achieve optimal stability. Engaging only the proximal fragment (E) would not provide adequate fixation.

Question 32

Besides early controlled range of motion, what other intra-operative technique is crucial to minimize post-operative elbow stiffness following olecranon fracture fixation?





Explanation

Meticulous anatomical reduction of the articular surface (C) is critical. A smooth, congruent joint surface minimizes friction, prevents abnormal contact stresses, and allows for smoother motion, significantly reducing the risk of post-traumatic arthritis and subsequent stiffness. Prolonged tourniquet time (A) and aggressive periosteal stripping (B) can increase tissue damage and lead to stiffness and heterotopic ossification. Oversized hardware (D) can itself be prominent and restrict motion. Routine prophylactic ulnar nerve transposition (E) is performed to prevent nerve symptoms, not primarily stiffness, although avoiding nerve irritation can facilitate rehabilitation.

Question 33

An elderly, low-demand patient presents with a severely comminuted fracture involving only the distal 15% of the olecranon, with triceps insertion still largely intact to the main ulna. What might be a reasonable consideration, especially if reconstruction is deemed too complex for the patient's functional needs?





Explanation

For very small, severely comminuted distal olecranon fragments (<20% of the olecranon, typically <2cm) in elderly, low-demand patients where anatomical reconstruction is challenging or unnecessary, excision of the fragment and reattaching or advancing the triceps tendon to the remaining ulna (C) can provide satisfactory function. This avoids hardware-related complications and prolonged surgery, while restoring the extensor mechanism. Tension band wiring (A) and plate fixation (B) are difficult with small, comminuted fragments. Intramedullary screw (D) is not suitable. Immobilization only (E) would likely lead to nonunion and loss of extension.

Question 34

In the context of olecranon fractures, a fracture is generally considered 'displaced' if there is greater than how many millimeters of separation or articular step-off?





Explanation

A fracture is generally considered displaced if there is greater than 2 mm (C) of separation or articular step-off. This threshold is commonly used to differentiate between fractures that can be managed non-operatively (if less than 2mm and stable) and those typically requiring operative intervention to restore anatomical alignment and function.

Question 35

The anconeus muscle plays a role in elbow function and stability. Where does it primarily originate and insert relative to the olecranon?





Explanation

The anconeus muscle originates from the posterior surface of the lateral epicondyle of the humerus and inserts onto the lateral aspect of the olecranon and the proximal ulna (B). It assists in elbow extension and stabilizes the ulnohumeral joint, particularly during pronation and supination.

Question 36

A patient develops ulnar nerve symptoms (paresthesias in the small and ring fingers, intrinsic muscle weakness) 3 weeks after uneventful olecranon fracture fixation. What is the most likely cause?





Explanation

Delayed onset of ulnar nerve symptoms (B) weeks to months after fixation strongly suggests nerve irritation or impingement by the hardware (screws, k-wires, plate edge) or surrounding scar tissue/edema. Acute laceration (A) would present immediately post-operatively. Compartment syndrome (C) and ischemic injury (D) would present much earlier and more acutely, often with severe pain and motor deficits. Traumatic neuroma (E) would be a much later complication, typically months to years after nerve injury.

Question 37

For an unstable olecranon fracture (Mayo Type III), what is the primary goal of surgical fixation?





Explanation

For unstable olecranon fractures (Mayo Type III, indicating associated elbow instability), the primary goal of surgical fixation is to restore ulnohumeral joint stability and congruity (C). Without a stable and congruent joint, proper function, early motion, and prevention of long-term complications like severe stiffness and arthritis are impossible. While preventing post-traumatic arthritis (B) is a long-term goal, restoring stability is the immediate, overriding surgical objective. The other options are either too narrow or incorrect.

Question 38

In pediatric olecranon fractures, what specific consideration is important due to the presence of growth plates?





Explanation

In pediatric olecranon fractures, it is crucial to preserve the olecranon physis (growth plate) (C) to prevent growth arrest, angular deformity, or length discrepancies. Surgical techniques, if required, must be carefully chosen to avoid damaging the physis. Tension band wiring (A) can be used in children, but K-wires must be placed carefully to avoid the physis. Non-displaced fractures (B) are often treated non-operatively. Ulnar nerve injury (D) is still a risk, as the nerve is present. Plate fixation (E) is an option but not the only one, and attention to the physis remains key.

Question 39

Why is it crucial for the Kirschner wires in tension band wiring to engage the anterior cortex of the ulna?





Explanation

Engaging the anterior cortex of the ulna (C) provides a strong bicortical purchase for the Kirschner wires, preventing them from backing out (pistoning) or migrating proximally. This ensures a stable construct that can effectively convert tensile forces into compression at the fracture site. Without anterior cortical engagement, the wires may be unstable, leading to fixation failure and loss of reduction.

Question 40

A patient presents after a fall with a suspected olecranon fracture and complete inability to actively extend the elbow. Other than an olecranon fracture, what condition should be included in the differential diagnosis for this specific functional deficit?





Explanation

A complete inability to actively extend the elbow strongly suggests a disruption of the extensor mechanism. While an olecranon fracture is primary, a triceps tendon rupture (D) (either from its insertion on the olecranon or more proximally) would produce the same inability to actively extend the elbow. Radial head fracture (A) affects rotation and flexion/extension with pain. Biceps rupture (B) affects flexion and supination. Medial epicondyle avulsion (C) affects valgus stability and flexion (common flexor origin). Interosseous membrane rupture (E) affects forearm stability.

Question 41

Intramedullary (IM) screw fixation for olecranon fractures is occasionally considered. In which specific scenario might it be a suitable choice?





Explanation

Intramedullary screw fixation (B) can be a suitable option for simple transverse or short oblique fractures without comminution, particularly in osteoporotic bone where Kirschner wires might not hold well, or in situations where hardware prominence from TBW is a major concern. It can act as a load-sharing device. It is generally not ideal for comminuted fractures (A) as it doesn't provide articular compression. For avulsion of the triceps (D), suture anchors are typically used. Open fractures (C) require different considerations. Ulnar shaft involvement (E) typically requires plate fixation of the shaft.

Question 42

All of the following are potential contributing factors to elbow stiffness following an olecranon fracture EXCEPT:





Explanation

Aggressive early active range of motion within pain limits (D) is actually a preventative measure against stiffness, as controlled motion helps maintain joint mobility and cartilage health. Therefore, it is not a contributing factor to stiffness. Prolonged immobilization (A), heterotopic ossification (B), and complex intra-articular comminution (C) are all well-known causes of elbow stiffness. Ulnar nerve entrapment (E) can cause pain and limit participation in rehabilitation, thereby indirectly contributing to stiffness.

Question 43

A 28-year-old active male presents with a Mayo Type IIA olecranon fracture. Which of the following is the most appropriate initial treatment plan?





Explanation

Mayo Type IIA is a displaced, noncomminuted, and stable fracture. For active patients, operative fixation is indicated to restore the triceps mechanism and allow for early motion and optimal function. Tension band wiring (C) is the gold standard for this fracture pattern due to its ability to convert tensile forces to compression and provide stable fixation for early rehabilitation. Sling only (A) or prolonged cast (B) would lead to stiffness and potential nonunion in a displaced fracture. Plate fixation (D) is generally considered overkill for a simple fracture but might be an alternative. TEA (E) is a salvage procedure.

Question 44

If hardware removal is indicated following tension band wiring for an olecranon fracture, what is the earliest time point it is typically considered, assuming fracture union?





Explanation

Hardware removal (D) for olecranon tension band wiring is typically considered 6-12 months post-operatively, after solid radiographic union has been achieved and often in response to hardware-related symptoms (e.g., prominence, irritation). Removing it earlier (A, B, C) risks refracture through the healing bone. While hardware can remain permanently if asymptomatic (E), it's very common to remove it due to its superficial location.

Question 45

During which part of a posterior surgical approach for an olecranon fracture is the ulnar nerve at the highest risk of iatrogenic injury?





Explanation

The ulnar nerve is at highest risk during medial soft tissue retraction (C) to expose the olecranon and during instrumentation (e.g., drilling K-wires or screws, particularly if directed medially). Aggressive or careless retraction of the soft tissues to expose the medial column or the entire olecranon can stretch or compress the nerve, especially if it's not formally identified and protected or transposed. While drilling can injure, retraction is a constant risk during the exposure phase. The nerve is usually protected after initial identification, but sustained or forceful retraction is often the culprit.

Question 46

How does a pure triceps avulsion fracture differ from a typical olecranon fracture in terms of surgical repair considerations?





Explanation

A pure triceps avulsion (C) involves the detachment of the triceps tendon from its insertion on the olecranon, with or without a small bony fleck. Surgical repair focuses on reattaching the tendon to the bone, often using suture anchors or transosseous sutures. Olecranon fractures (B) typically involve fixing bone fragments to bone fragments, often impacting the articular surface (D). While an olecranon fracture can disrupt the triceps insertion, a 'pure' triceps avulsion is a distinct entity focusing on tendon repair. Plate fixation (A) is for bony comminution/instability, not pure tendon repair. Triceps avulsion can occur with olecranon fractures (E), but the question asks about the difference in repair considerations for a 'pure' avulsion.

Question 47

An 80-year-old, low-demand patient presents with a severely comminuted olecranon fracture that is difficult to reconstruct anatomically, and the bone quality is poor. What might be a pragmatic treatment option to consider?





Explanation

For severely comminuted, unreconstructable olecranon fractures in elderly, low-demand patients with poor bone quality, total elbow arthroplasty (D) can be a viable salvage option. It provides immediate stability and allows for early motion, circumventing the challenges of fixation in poor bone and potentially leading to better functional outcomes than a complex, likely failed, reconstruction in this demographic. Excision and triceps advancement (C) is an option for smaller, very distal fragments. Anatomical reduction and plate (A) or tension band wiring (B) are likely to fail due to poor bone quality and comminution. Prolonged immobilization (E) would lead to severe stiffness.

Question 48

Which peripheral nerve is most commonly injured in association with olecranon fractures or during their surgical repair?





Explanation

The ulnar nerve (C) is located in the cubital tunnel posterior to the medial epicondyle, making it highly susceptible to injury during olecranon fractures (due to direct trauma, displacement of fragments, or hematoma) and during surgical approaches (due to retraction, direct injury, or hardware impingement). It is by far the most commonly involved nerve in this setting.

Question 49

The olecranon effectively functions as a lever arm. This anatomical advantage primarily contributes to which function?





Explanation

The olecranon's primary function as a lever arm is to enhance the efficiency of the triceps brachii muscle in extending the elbow (D). Its posterior projection increases the moment arm for the triceps, allowing it to generate greater torque for extension with less muscle force. This biomechanical advantage is crucial for powerful elbow extension.

Question 50

A patient undergoes successful plate fixation of a comminuted olecranon fracture. What is the primary purpose of routine radiographic follow-up appointments in the first few weeks to months post-surgery?





Explanation

The primary purpose of routine radiographic follow-up (C) in the early post-operative period is to confirm that the fracture remains reduced and fixed, and to monitor for signs of healing (union). Loss of reduction or fixation failure would necessitate further intervention. While other options (A, B, E) are considerations, they are typically secondary or longer-term assessments. Ulnar nerve decompression (D) is a clinical assessment, not primarily radiographic.

Question 51

In a patient with an olecranon fracture, if intra-articular step-off or gap is present, which treatment option is generally mandated for optimal long-term outcome, especially in an active adult?





Explanation

Any significant intra-articular step-off or gap (typically >2mm) in an olecranon fracture mandates open reduction and internal fixation (ORIF) (C) for optimal long-term outcome, especially in an active adult. This is critical to restore articular congruity, reduce the risk of post-traumatic arthritis, and allow for early rehabilitation. Non-operative management (A, B) is appropriate only for non-displaced or minimally displaced fractures. Fragment excision (D) is reserved for very small, non-reconstructible fragments in low-demand patients. Functional bracing (E) is used post-fixation, not as primary treatment for displaced intra-articular fractures.

Question 52

The vascular supply to the olecranon is primarily from branches of which artery?





Explanation

The vascular supply to the olecranon and proximal ulna is robust, primarily deriving from a periosteal network fed by recurrent branches of the ulnar artery (C), specifically the posterior ulnar recurrent artery, and to a lesser extent, the interosseous arteries. The brachial (A) artery is more proximal, and radial (B) artery branches are more lateral/distal.

Question 53

Which of the following describes the typical appearance of a stable olecranon fracture on a lateral radiograph after fixation with tension band wiring?





Explanation

Tension band wiring involves Kirschner wires placed longitudinally across the fracture and a 'figure-of-eight' wire loop (C) that converts the tensile force of the triceps into compression across the fracture site, ensuring stability. Distraction (A) would indicate failure. Absence of wires (B) would mean no fixation. Joint subluxation (D) or intra-articular screws (E) are complications or malfixation.

Question 54

A patient sustained an olecranon fracture due to a fall, and a palpable defect is noted. What immediate action is paramount to prevent further soft tissue damage and reduce pain before definitive treatment?





Explanation

Immobilizing the elbow in a comfortable position (D), typically around 30-45 degrees of flexion where the triceps tension is minimized, is paramount. This prevents further soft tissue damage, reduces pain, and protects neurovascular structures until definitive treatment. Vigorous range of motion (A) and attempting closed reduction without imaging (E) are harmful. Hot compresses (B) are inappropriate for acute trauma. Discharging with just opioids (C) without proper immobilization is negligent.

Question 55

Which of the following anatomical structures stabilizes the olecranon against varus stress?





Explanation

The Medial Collateral Ligament (MCL) (A), specifically its anterior bundle, is the primary static stabilizer of the elbow against valgus stress. While the question asks about varus stress and the olecranon, the olecranon itself doesn't directly stabilize against varus stress in the same way the MCL resists valgus. However, the integrity of the ulnohumeral joint (where the olecranon articulates) is indirectly influenced by all ligamentous structures. The lateral ulnar collateral ligament (LUCL) (B) stabilizes against varus and posterolateral rotatory instability. Given the options and the 'stabilizes the olecranon' context, it's slightly ambiguous. Re-reading, it is asking what stabilizes 'the olecranon', which is part of the ulna, against varus stress. The LUCL stabilizes the ulnar side of the joint, preventing it from varus opening. Therefore, LUCL is the correct answer for varus stability related to the ulna/olecranon. My initial thought process was incorrect. The question isn't about the olecranon resisting varus stress, but what ligament prevents the ulna (and thus olecranon) from gapping open on the lateral side under varus stress. This would be the LUCL. Let me correct the answer and explanation.

Question 56

Which of the following anatomical structures primarily stabilizes the ulnohumeral joint against varus stress?





Explanation

The Lateral Ulnar Collateral Ligament (LUCL) (B) is the primary static stabilizer of the ulnohumeral joint (and thus the olecranon-bearing ulna) against varus stress and posterolateral rotatory instability. The Medial Collateral Ligament (MCL) (A) stabilizes against valgus stress. The annular ligament (C) stabilizes the radial head. The triceps tendon (D) extends the elbow. The interosseous membrane (E) connects the radius and ulna along the forearm.

Question 57

A patient presents with an olecranon fracture that is comminuted and involves a significant portion of the trochlear notch. What specific post-operative complication is of highest concern for this patient, even with good fixation?





Explanation

When a comminuted olecranon fracture involves a significant portion of the trochlear notch (the articular surface), there is a high risk of residual articular incongruity, even with meticulous fixation. This articular disruption is the most significant predisposing factor for the development of post-traumatic arthritis (D) due to increased contact pressures and cartilage degeneration. While ulnar neuropathy (C) and hardware failure (E) are common complications, post-traumatic arthritis is a direct consequence of intra-articular injury and is of high concern for long-term function. Radial head subluxation (A) and DRUJ instability (B) are associated with other specific injury patterns (e.g., Essex-Lopresti).

Question 58

What type of olecranon fracture typically results from a sudden, forceful contraction of the triceps brachii muscle against resistance (e.g., attempting to break a fall)?





Explanation

A sudden, forceful contraction of the triceps brachii muscle against resistance can cause an avulsion fracture of the olecranon tip (C), where the triceps tendon pulls off a fragment of bone. Highly comminuted fractures (A) and impaction fractures (E) are more common with direct trauma. Transverse (B) or oblique (D) fractures can occur from various mechanisms but a pure 'avulsion' mechanism is most typical for the tip fragment under triceps pull.

Question 59

In an active individual, what is the minimum acceptable goal for elbow range of motion (flexion-extension arc) following rehabilitation from an olecranon fracture?





Explanation

While full extension and flexion (E) is ideal, a functional range of motion for most activities of daily living is generally considered to be 30 to 130 degrees of flexion-extension (B). Achieving this range is a realistic and acceptable goal after complex elbow trauma such as an olecranon fracture, balancing stability and mobility. Less than 30 degrees of extension loss or 130 degrees of flexion loss would significantly impair function.

Question 60

Which factor makes the posterior aspect of the elbow particularly prone to hardware prominence and subsequent irritation after olecranon fracture fixation?





Explanation

The posterior aspect of the elbow (over the olecranon) has very little subcutaneous tissue or muscle coverage, making it particularly susceptible to hardware prominence and irritation (B). Even well-placed hardware can be felt directly under the skin, leading to pain, bursitis, or skin breakdown, often necessitating removal once the fracture has healed. While frequent movement (D) can exacerbate symptoms, the lack of soft tissue is the primary anatomical reason for prominence.

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Dr. Mohammed Hutaif
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Prof. Dr. Mohammed Hutaif
Consultant Orthopedic & Spine Surgeon
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