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2. Trauma MCQs

Practice Set 52 of 640

This practice set contains high-yield board review questions covering key concepts in 2. Trauma. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.

Question 1021

Topic: 2. Trauma

During an intramedullary nailing procedure for a tibia fracture, a surgeon achieves a very tight interference fit at the isthmus. Biomechanically, how does this isthmic engagement alter the overall construct?

. It converts the construct from load-sharing to load-bearing
. It effectively shortens the working length and increases stiffness
. It increases interfragmentary strain to >100%
. It significantly decreases the torsional stiffness of the implant
. It mandates the use of dynamic locking screws

Correct Answer & Explanation

. It effectively shortens the working length and increases stiffness

Explanation

A tight interference fit at the isthmus acts as a stable point of bone-nail fixation. This effectively decreases the working length of the nail, thereby significantly increasing both the bending and torsional stiffness of the construct.

Question 1022

Topic: 2. Trauma

A 40-year-old male sustains a distal third tibia fracture treated with an intramedullary nail. To improve stability in this metaphyseal region, the surgeon utilizes angle-stable interlocking screws. What is the primary advantage of angle-stable screws over standard interlocking screws?

. They allow for dynamic axial compression upon weight-bearing
. They eliminate toggle between the screw and the nail, increasing construct rigidity
. They decrease the area moment of inertia of the nail
. They promote primary bone healing by achieving absolute stability
. They automatically center the nail within the medullary canal

Correct Answer & Explanation

. They eliminate toggle between the screw and the nail, increasing construct rigidity

Explanation

Angle-stable locking screws utilize mechanisms (like threaded screw heads) that lock directly into the nail. This eliminates 'toggle' or micromotion between the screw and nail hole, significantly enhancing stability in short metaphyseal fracture segments.

Question 1023

Topic: 2. Trauma

A 28-year-old male presents to the emergency department after a high-energy motor vehicle collision, sustaining a closed midshaft diaphyseal tibia fracture. He is hemodynamically stable, and initial neurovascular examination is intact. Given the epidemiology and anatomical considerations of high-energy tibia fractures, which of the following statements is most accurate?

. The incidence of diaphyseal tibia fractures is highest in elderly individuals due to low-energy falls.
. The primary blood supply to the tibial diaphysis is predominantly from periosteal vessels, making it less vulnerable to high-energy trauma.
. The anteromedial surface of the tibia has a robust soft tissue envelope, offering significant protection against open fractures.
. High-energy mechanisms are frequently associated with comminution and a higher propensity for open fractures, particularly in young, active males.
. The fibula is the primary weight-bearing bone of the lower leg, and its integrity is crucial for load sharing in midshaft tibia fractures.

Correct Answer & Explanation

. High-energy mechanisms are frequently associated with comminution and a higher propensity for open fractures, particularly in young, active males.

Explanation

Correct Answer: DExplanation:The case states that high-energy mechanisms are frequently associated with comminution, segmental defects, significant soft tissue compromise, and a higher propensity for open fractures (up to 30-40% in some series). It also notes a bimodal distribution, affecting young, active males involved in high-energy trauma. This directly supports option D.Option A is incorrect:While elderly individuals are affected by lower-energy falls, the bimodal distribution includes young, active males involved in high-energy trauma, which is the context of this question. The overall incidence is 16.9 per 100,000 person-years, but high-energy mechanisms are distinct.Option B is incorrect:The main blood supply to the tibial diaphysis is primarily from the nutrient artery (a branch of the posterior tibial artery). While periosteal vessels contribute, especially after trauma or reaming, the nutrient artery is the primary supply, and damage to it in high-energy injuries can impair healing.Option C is incorrect:The case explicitly states, 'The tibia has a precarious soft tissue envelope, particularly on its anteromedial surface, where it is largely subcutaneous.' This limited soft tissue coverage predisposes to open fractures and wound healing complications.Option E is incorrect:The case states, 'The tibia is the primary weight-bearing bone of the lower leg.' The fibula runs parallel and provides stability to the ankle joint, but is not the primary weight-bearing bone. While its integrity affects load sharing and rotational stability, its primary biomechanical importance is at the ankle and knee, not as the primary weight-bearer for the lower leg.

Question 1024

Topic: 2. Trauma

A 35-year-old construction worker sustains a high-energy closed midshaft tibia fracture after a fall from scaffolding. On presentation, he complains of severe pain, especially with passive dorsiflexion of the toes. His leg is tense to palpation, and sensation in the first web space is diminished. Which of the following neurovascular structures is most likely compromised in this scenario, and what is the immediate management?

. Superficial peroneal nerve; emergent surgical exploration and nerve repair.
. Posterior tibial artery; emergent CT angiogram to confirm injury.
. Deep peroneal nerve; emergent four-compartment fasciotomy.
. Tibial nerve; observation for neuropraxia and serial neurological exams.
. Peroneal artery; provisional external fixation followed by vascular repair.

Correct Answer & Explanation

. Deep peroneal nerve; emergent four-compartment fasciotomy.

Explanation

Correct Answer: CExplanation:The clinical presentation of severe pain with passive stretch, tense compartment, and diminished sensation in the first web space (which is innervated by the deep peroneal nerve) are classic signs of acute compartment syndrome in the anterior compartment. The deep peroneal nerve and anterior tibial artery run in the anterior compartment. The case explicitly states that compartment syndrome is a surgical emergency requiring emergent fasciotomy.Option A is incorrect:The superficial peroneal nerve innervates the dorsum of the foot (except the first web space) and runs in the lateral compartment. While it can be injured, the specific symptoms point more strongly to the anterior compartment. Emergent surgical exploration for nerve repair is not the immediate management for compartment syndrome.Option B is incorrect:The posterior tibial artery runs in the deep posterior compartment. While vascular injury is a concern in high-energy trauma, the symptoms described are more indicative of compartment syndrome than a direct arterial transection, and emergent fasciotomy takes precedence over diagnostic imaging if compartment syndrome is clinically evident.Option D is incorrect:The tibial nerve runs in the deep posterior compartment. While nerve injury can occur, the constellation of symptoms (pain with passive stretch, tense compartment, specific sensory deficit) points to compartment syndrome, which requires immediate surgical intervention, not just observation.Option E is incorrect:The peroneal artery runs in the deep posterior compartment. Similar to option B, while vascular injury is a risk, the immediate concern with these symptoms is compartment syndrome, which requires fasciotomy, not just provisional fixation and vascular repair (unless a definitive vascular injury is confirmed and contributing to ischemia, which is not the primary presentation here).

Question 1025

Topic: 2. Trauma
A 62-year-old male presents with a Gustilo-Anderson Type IIIA open midshaft tibia fracture after being struck by a car. He has multiple other injuries, including a closed head injury and a pelvic fracture, but is hemodynamically stable after initial resuscitation. Based on the case guidelines, what is the most appropriate initial management strategy for his tibia fracture?
. Emergent surgical debridement and provisional external fixation, followed by delayed definitive fixation.
. Non-operative management with serial casting and close monitoring for soft tissue healing.
. Immediate definitive intramedullary nailing within 6 hours to achieve early total care.
. Primary plate osteosynthesis with autogenous bone grafting due to the open nature of the fracture.
. Delay all surgical intervention for 48-72 hours to allow for soft tissue swelling to subside.

Correct Answer & Explanation

. Emergent surgical debridement and provisional external fixation, followed by delayed definitive fixation.

Explanation

For Gustilo I, II, IIIA fractures, thorough surgical debridement of all contaminated and devitalized tissue is paramount. Damage Control Orthopedics (DCO): For unstable polytrauma patients or those with severe soft tissue swelling/compromise, provisional external fixation is performed first. Definitive fixation (usually IM nailing) is delayed until the patient is physiologically stable and soft tissue swelling has subsided. Given the Gustilo IIIA open fracture and polytrauma status, emergent debridement and provisional external fixation are the most appropriate initial steps.

Question 1026

Topic: 2. Trauma

A 40-year-old male presents with a high-energy midshaft tibia fracture. Pre-operative planning is underway. The trauma surgeon notes a concern for potential intra-articular extension at the knee, as well as significant comminution not fully appreciated on plain radiographs. Which imaging modality is most appropriate to address these specific concerns?

. Ankle-Brachial Index (ABI) measurement.
. Magnetic Resonance Imaging (MRI).
. Computed Tomography (CT) scan.
. Conventional angiography.
. Repeat plain radiographs with oblique views.

Correct Answer & Explanation

. Computed Tomography (CT) scan.

Explanation

Correct Answer: CExplanation:The case states that a CT scan is 'Useful for identifying subtle intra-articular extension at the knee or ankle, which can influence fixation strategy' and for 'Detailed assessment of comminution, bone loss, and fracture geometry.' This directly addresses both concerns mentioned in the vignette.Option A is incorrect:ABI is used to assess vascular status, not fracture morphology or intra-articular extension.Option B is incorrect:MRI is rarely indicated acutely for fracture assessment but may be useful for ligamentous injury assessment at the knee/ankle if suspected post-reduction. It is not the primary modality for bone detail or comminution in the acute setting.Option D is incorrect:Conventional angiography is indicated if there is suspicion of vascular injury, not for assessing intra-articular extension or comminution.Option E is incorrect:While oblique views on plain radiographs can provide more information than AP/lateral views, they are still limited in assessing subtle intra-articular extension or complex comminution compared to a CT scan.

Question 1027

Topic: 2. Trauma

During intramedullary nailing of a midshaft tibia fracture, the surgeon is preparing the entry point. The image below demonstrates a common approach for proximal tibial entry. Which of the following statements accurately describes a key consideration for this step?

. The entry point should be lateral to the lateral tibial spine to avoid the patellar tendon.
. Suprapatellar entry is preferred in all cases to minimize anterior knee pain.
. The goal is to align the entry point with the central axis of the medullary canal in both AP and lateral planes.
. Reaming should always precede entry point preparation to ensure adequate canal size.
. The entry point is typically made through the medial collateral ligament to facilitate nail insertion.

Correct Answer & Explanation

. The goal is to align the entry point with the central axis of the medullary canal in both AP and lateral planes.

Explanation

Correct Answer: CExplanation:The case states, 'The choice of entry point is critical to avoid malalignment (especially apex anterior/posterior deformity or valgus/varus) and iatrogenic injury.' It further specifies, 'Once the entry point is identified on the proximal tibia (usually medial to the lateral tibial spine and lateral to the medial tibial spine, aligning with the intercondylar notch), an awl or drill is used to open the cortex. The goal is to align with the central axis of the medullary canal in both AP and lateral planes.' This directly supports option C.Option A is incorrect:The entry point is usually medial to the lateral tibial spine and lateral to the medial tibial spine, aligning with the intercondylar notch, not lateral to the lateral tibial spine. Splitting the patellar tendon centrally or paratendinously is a common approach.Option B is incorrect:While suprapatellar nailing is a technique that may reduce anterior knee pain, the case describes it as 'a more recent technique' and does not state it is preferred in all cases. Patellar ligament splitting is also a common approach.Option D is incorrect:Entry point preparation (opening the cortex) always precedes reaming. Reaming is the sequential enlargement of the medullary canal after the entry point is established.Option E is incorrect:The entry point is made on the proximal tibia, typically through or adjacent to the patellar tendon, not through the medial collateral ligament, which is a knee stabilizer.

Question 1028

Topic: 2. Trauma
A 50-year-old male with a closed, comminuted midshaft tibia fracture is undergoing intramedullary nailing. The surgeon is debating between reamed and unreamed nailing. The patient has no other significant comorbidities, and soft tissue swelling is minimal. Based on the case, which approach is generally preferred for this type of fracture in this patient, and why?
. Unreamed nailing, because it preserves endosteal blood supply and reduces the risk of fat embolism.
. Reamed nailing, because it allows for a larger, stiffer nail, providing greater stability and enhancing callus formation.
. Unreamed nailing, because it is preferred for Gustilo II and IIIA open fractures to avoid spreading contamination.
. Reamed nailing, because it is associated with lower rates of anterior knee pain post-operatively.
. Unreamed nailing, because it is less technically demanding and faster to perform.

Correct Answer & Explanation

. Reamed nailing, because it allows for a larger, stiffer nail, providing greater stability and enhancing callus formation.

Explanation

Reamed intramedullary nailing is the gold standard for diaphyseal tibia fractures due to superior union rates, lower reoperation rates, and faster time to union compared to plating or casting for most patterns. Reamed nailing maximizes nail-to-bone contact, allowing for a larger diameter and stiffer nail, which provides greater rotational and bending stability and enhances primary callus formation. This aligns with the scenario of a closed, comminuted fracture in a healthy patient where stability and union are paramount.

Question 1029

Topic: 2. Trauma

A 22-year-old male presents with a high-energy midshaft tibia fracture with significant comminution and a wide medullary canal, making stable reduction challenging. The surgeon decides to use an adjunct technique to improve alignment and prevent malreduction during intramedullary nailing. The image below illustrates a technique that could be employed in this situation. Which of the following adjuncts is most appropriate for this scenario?

. Cerclage wires to compress all comminuted fragments around the nail.
. Bone grafting at the fracture site prior to nail insertion.
. Blocking screws (Poller screws) to guide the nail into the correct position.
. A temporary external fixator for definitive fixation.
. Plate osteosynthesis as the primary fixation method.

Correct Answer & Explanation

. Blocking screws (Poller screws) to guide the nail into the correct position.

Explanation

Correct Answer: CExplanation:The case states, 'Blocking screws (Poller Screws): Small cortical screws placed adjacent to the IM nail track to guide the nail into the correct position, preventing malalignment in specific planes (e.g., apex anterior/posterior, valgus/varus). Especially useful for metadiaphyseal fractures or wide medullary canals.' This directly matches the clinical scenario of a wide medullary canal and challenging reduction.Option A is incorrect:The case states, 'Cerclage Wires: Rarely used for midshaft diaphyseal fractures due to disruption of periosteal blood supply, but may be considered for large butterfly fragments that are difficult to reduce or stabilize. Use sparingly and with caution.' This suggests they are not the most appropriate primary adjunct for general comminution and wide canals.Option B is incorrect:Bone grafting is typically used for bone loss, delayed union, or non-union, often delayed until soft tissue healing is complete. It is not an adjunct for achieving acute reduction and alignment during IM nailing.Option D is incorrect:A temporary external fixator can assist with reduction, but it is typically used for provisional stabilization in damage control orthopedics or severe open fractures, not as a definitive fixation method in this context, nor is it the specific adjunct for guiding the nail in a wide canal.Option E is incorrect:Plate osteosynthesis is an alternative fixation method, not an adjunct to IM nailing, and is generally a secondary option for midshaft diaphyseal tibia fractures.

Question 1030

Topic: 2. Trauma

A 48-year-old male undergoes intramedullary nailing for a high-energy closed midshaft tibia fracture. Post-operatively, he develops increasing pain, swelling, and paresthesia in the foot. On examination, his foot is cool, and pedal pulses are diminished. Which of the following is the most critical early complication to rule out, and what is its immediate management?

. Deep vein thrombosis (DVT); initiate anticoagulation.
. Fat embolism syndrome (FES); provide supportive care and ventilatory support.
. Acute compartment syndrome; emergent four-compartment fasciotomy.
. Vascular injury; emergent vascular surgery consultation and repair.
. Infection; start broad-spectrum intravenous antibiotics.

Correct Answer & Explanation

. Vascular injury; emergent vascular surgery consultation and repair.

Explanation

Correct Answer: DExplanation:The symptoms of increasing pain, swelling, paresthesia, a cool foot, and diminished pedal pulses are highly suggestive of acute vascular compromise (e.g., laceration, transection, or thrombosis of major arteries). The case lists 'Vascular Injury' as an early complication, describing it as 'Laceration, transection, or thrombosis of major arteries (anterior/posterior tibial, peroneal). Presents as pulselessness, pallor, cold extremity.' The management is 'Emergent vascular surgery consultation and repair (bypass or primary repair).' While compartment syndrome can present similarly, the diminished pulses and cool extremity strongly point to a primary vascular injury requiring immediate repair to prevent limb loss.Option A is incorrect:DVT typically presents with swelling and pain, but usually not with a cool extremity or diminished pulses, which are signs of arterial insufficiency.Option B is incorrect:FES presents with a triad of respiratory insufficiency, neurological dysfunction, and petechial rash, not primarily with localized limb ischemia.Option C is incorrect:While acute compartment syndrome is a critical early complication, the presence of diminished pulses and a cool extremity makes vascular injury a more immediate and limb-threatening concern that must be addressed first. Compartment syndrome can be secondary to vascular injury, but the primary issue here is arterial flow.Option E is incorrect:Infection is a later complication unless it's an open fracture, and its acute presentation would not typically include a cool extremity and diminished pulses.

Question 1031

Topic: 2. Trauma

A 30-year-old male undergoes intramedullary nailing for a high-energy midshaft tibia fracture. Six months post-operatively, he complains of persistent pain around the knee, particularly with kneeling and stair climbing. Radiographs confirm union of the fracture, and the image below shows a typical final IM nail construct. What is the most likely diagnosis for his persistent knee pain, and what is the recommended management?

. Aseptic hypertrophic non-union; revision surgery with exchange nailing.
. Malunion; corrective osteotomy and internal fixation.
. Anterior knee pain post-IM nailing; physical therapy and potential hardware removal after complete union.
. Hardware failure; revision surgery with a new implant.
. Chronic regional pain syndrome (CRPS); sympathetic nerve block.

Correct Answer & Explanation

. Anterior knee pain post-IM nailing; physical therapy and potential hardware removal after complete union.

Explanation

Correct Answer: CExplanation:The case specifically addresses 'Anterior Knee Pain Post-IM Nailing' as a common late complication, stating, 'Up to 50% of patients experience anterior knee pain after IM nailing of the tibia.' It describes the etiology as multifactorial and the management as 'While common, hardware removal for symptomatic pain is often effective, but should be delayed until complete union.' The vignette describes persistent knee pain after confirmed union, which is characteristic of this complication.Option A is incorrect:Non-union implies failure of fracture healing, but the vignette states radiographs confirm union.Option B is incorrect:Malunion implies the fracture healed in an unacceptable position, which is not indicated by the symptoms of knee pain after union.Option D is incorrect:Hardware failure would typically be associated with pain at the fracture site or loss of reduction, and the radiographs confirm union, making hardware failure less likely to be the primary cause of isolated anterior knee pain.Option E is incorrect:CRPS is a complex pain syndrome with distinct features (e.g., allodynia, trophic changes) not fully described in the vignette, and while possible, anterior knee pain post-IM nailing is a much more common and specific diagnosis in this context.

Question 1032

Topic: 2. Trauma
A 70-year-old male with a history of smoking and peripheral vascular disease sustains a high-energy Gustilo-Anderson Type IIIA open midshaft tibia fracture. He undergoes emergent debridement and provisional external fixation. Based on the summary of key literature and guidelines, which of the following statements regarding his definitive management and potential complications is most accurate?
. Unreamed intramedullary nailing is the gold standard for Gustilo IIIA open fractures to maximize stability and union rates.
. Delayed definitive soft tissue coverage beyond 7 days for Gustilo IIIB/IIIC fractures has been shown to reduce infection rates.
. Exchange nailing is a highly effective treatment for aseptic hypertrophic non-unions.
. Prophylactic autogenous bone grafting is routinely indicated for highly comminuted open fractures to prevent non-union.
. Early total care (ETC) with definitive internal fixation within 24-48 hours is preferred for all open tibia fractures.

Correct Answer & Explanation

. Exchange nailing is a highly effective treatment for aseptic hypertrophic non-unions.

Explanation

Exchange nailing is a highly effective treatment for aseptic hypertrophic non-unions. This is a well-established principle in orthopedic trauma.

Question 1033

Topic: 2. Trauma

A 38-year-old male presents with a high-energy proximal tibial diaphyseal fracture. His medical history includes Type 2 Diabetes Mellitus (HbA1c 6.8%) and a 15 pack-year smoking history.

Considering these comorbidities, which of the following is the MOST significant anticipated complication directly related to the patient's biological healing cascade and perioperative risk?

. Acute kidney injury
. Deep vein thrombosis
. Delayed union or nonunion
. Pulmonary embolism
. Myocardial infarction

Correct Answer & Explanation

. Delayed union or nonunion

Explanation

Correct Answer: CThe case explicitly states that the patient's Type 2 Diabetes Mellitus and 15 pack-year smoking history significantly elevate the risk of delayed union, nonunion, and surgical site infection. Diabetes inherently alters bone microarchitecture and impairs cellular responses to trauma, while smoking induces profound peripheral vasoconstriction and tissue hypoxia. These factors directly compromise the biological healing cascade. While other complications listed are possible in trauma patients, delayed union or nonunion is the most directly and significantly impacted by the patient's specific comorbidities as described in the case.

Question 1034

Topic: 2. Trauma

The patient's right lower extremity exhibits gross clinical deformity, significant non-pitting edema, and ecchymosis. The skin integrity is closed, but there is deep muscle contusion and moderate to severe abrasion. The compartments are tense but compressible. Pain with passive stretch of the ischemic muscles is noted but not deemed disproportionate.

Based on these findings, what is the most appropriate Tscherne classification for the closed soft tissue injury, and what is the critical diagnostic threshold for acute compartment syndrome in this patient?

. Tscherne Grade 0; Absolute intracompartmental pressure > 30 mmHg
. Tscherne Grade 1; Delta P (diastolic BP - intracompartmental pressure) < 40 mmHg
. Tscherne Grade 2; Delta P (diastolic BP - intracompartmental pressure) < 30 mmHg
. Tscherne Grade 3; Absolute intracompartmental pressure > 45 mmHg
. Tscherne Grade 2; Absolute intracompartmental pressure > 30 mmHg

Correct Answer & Explanation

. Tscherne Grade 2; Delta P (diastolic BP - intracompartmental pressure) < 30 mmHg

Explanation

Correct Answer: CThe case describes the soft tissue envelope as exhibiting signs of severe contusion, deep muscle contusion, and moderate to severe abrasion, which is explicitly stated as consistent with aTscherne Grade 2closed soft tissue injury. Regarding acute compartment syndrome, the case specifies that aDelta P calculation (diastolic blood pressure minus intracompartmental pressure) of less than 30 mmHgwould serve as the absolute indication for emergent four-compartment fasciotomies. Therefore, option C accurately reflects both the Tscherne classification and the critical diagnostic threshold for compartment syndrome as detailed in the case.

Question 1035

Topic: 2. Trauma

Review the provided radiograph of the patient's right lower extremity.

Based on the case and the provided image, which of the following best describes the fracture pattern and associated deformity?

. Distal third spiral fracture with apex posterior angulation.
. Mid-diaphyseal transverse fracture with minimal displacement.
. Proximal third comminuted oblique fracture with apex anterior and valgus angulation.
. Pilon fracture with significant intra-articular involvement.
. Isolated fibula fracture with an intact tibia.

Correct Answer & Explanation

. Proximal third comminuted oblique fracture with apex anterior and valgus angulation.

Explanation

Correct Answer: CThe case explicitly states: 'Radiographic analysis of the right lower extremity revealed a severely displaced, comminuted fracture of the proximal third of the tibial diaphysis. The fracture pattern exhibited a dominant oblique configuration with a large, laterally displaced butterfly fragment... with significant apex anterior (procurvatum) and apex lateral (valgus) angulation.' The provided image clearly demonstrates these features, showing a fracture in the proximal third of the tibia with multiple fragments (comminuted), an oblique component, and the characteristic apex anterior and valgus angulation. Options A, B, D, and E describe different fracture locations, patterns, or severities that are inconsistent with both the image and the detailed description in the case.

Question 1036

Topic: 2. Trauma

Following plain radiographs, a dedicated computed tomography (CT) scan of the right knee and proximal tibia with fine axial cuts and multiplanar reconstructions was ordered for this patient.

What is the MOST critical reason for obtaining a CT scan in a high-energy proximal third tibial shaft fracture, even if plain radiographs appear to show an extra-articular injury?

. To assess the integrity of the distal tibiofibular syndesmosis.
. To quantify the degree of soft tissue edema and contusion.
. To identify occult intra-articular extension into the tibial plateau.
. To evaluate for concomitant popliteal artery injury.
. To determine the exact length and diameter of the intramedullary canal for templating.

Correct Answer & Explanation

. To identify occult intra-articular extension into the tibial plateau.

Explanation

Correct Answer: CThe case emphasizes the importance of the CT scan: 'While plain radiographs provide the macroscopic architecture of the diaphyseal injury, they are notoriously insensitive for detecting occult intra-articular extension into the tibial plateau. Literature indicates that up to 20% to 30% of high-energy proximal third tibial shaft fractures possess an unrecognized coronal or sagittal split propagating into the articular surface. The presence of an intra-articular component drastically alters the surgical algorithm...' Therefore, the primary and most critical reason for the CT scan in this context is to rule out occult intra-articular extension, which would fundamentally change the surgical approach. While templating (E) is a benefit, it's not themost criticalreason for the CT in terms of altering the fundamental treatment strategy for an articular injury.

Question 1037

Topic: 2. Trauma

The patient has a closed, comminuted proximal third tibial diaphyseal fracture (AO/OTA 42-B3, Tscherne Grade 2) and a history of Type 2 Diabetes and smoking. Surgical stabilization is indicated.

Considering the patient's fracture characteristics and comorbidities, which surgical fixation method is generally considered the gold standard and offers the most biomechanical advantages for this specific injury, while mitigating risks associated with his medical history?

. Long-leg casting for 12 weeks.
. External fixation as a definitive treatment.
. Minimally Invasive Percutaneous Plate Osteosynthesis (MIPPO).
. Intramedullary Nailing (IMN).
. Open Reduction Internal Fixation (ORIF) with a single anterior plate.

Correct Answer & Explanation

. Intramedullary Nailing (IMN).

Explanation

Correct Answer: DThe case explicitly states: 'Intramedullary Nailing (IMN) remains the gold standard for tibial diaphyseal fractures. It is a load-sharing device that preserves the extraosseous blood supply, offers superior biomechanical stability against bending and torsional forces, and allows for earlier weight-bearing.' It also discusses the disadvantages of plating (MIPPO or ORIF with plates) in this context, noting that 'plating the tibia, particularly on the subcutaneous anteromedial surface, requires significant soft tissue stripping... and introduces bulky hardware under a traumatized soft tissue envelope, significantly increasing the risk of wound dehiscence and deep infection.' This risk is particularly relevant for a diabetic, smoking patient with impaired healing. Non-operative management (A) is contraindicated for this high-energy, displaced fracture, and external fixation (B) is generally reserved for damage control or severe open fractures, not definitive treatment in a stable, closed injury.

Question 1038

Topic: 2. Trauma

The surgical plan for this patient involves a Suprapatellar Intramedullary Nailing technique.

What is the primary biomechanical advantage of utilizing a suprapatellar approach for intramedullary nailing of a proximal tibial diaphyseal fracture, compared to a traditional infrapatellar approach?

. It allows for easier distal interlocking.
. It completely eliminates the need for blocking screws.
. It reduces tension on the extensor mechanism, thereby neutralizing the primary deforming force causing procurvatum.
. It provides direct visualization of the fracture site.
. It significantly reduces the risk of acute compartment syndrome.

Correct Answer & Explanation

. It reduces tension on the extensor mechanism, thereby neutralizing the primary deforming force causing procurvatum.

Explanation

Correct Answer: CThe case highlights the key advantage of the suprapatellar approach: 'The critical advantage of the suprapatellar approach is patient positioning. The limb is positioned with the knee in a semi-extended posture, resting on a sterile bump at approximately 15 to 20 degrees of flexion. This semi-extended position dramatically reduces the tension on the extensor mechanism, neutralizing the primary deforming force that causes procurvatum.' This directly addresses the common challenge of apex anterior deformity in proximal tibial nailing. Options A, B, D, and E are incorrect; distal interlocking is not inherently easier, blocking screws are still often necessary, direct visualization of the fracture is not achieved, and it does not significantly reduce the risk of compartment syndrome compared to other approaches.

Question 1039

Topic: 2. Trauma

During the intramedullary nailing of this patient's proximal tibial fracture, blocking screws (Poller screws) were strategically placed in the proximal fragment.

To prevent the classic apex anterior (procurvatum) and valgus malalignment, where should the blocking screws be placed in the proximal fragment relative to the anticipated nail trajectory?

. Anteriorly to prevent procurvatum, and medially to prevent valgus.
. Posteriorly to prevent procurvatum, and laterally to prevent valgus.
. Anteriorly to prevent valgus, and medially to prevent procurvatum.
. Posteriorly to prevent valgus, and laterally to prevent procurvatum.
. Two screws placed directly anterior and posterior to the nail to prevent rotation.

Correct Answer & Explanation

. Posteriorly to prevent procurvatum, and laterally to prevent valgus.

Explanation

Correct Answer: BThe case provides precise guidance on blocking screw placement: 'To prevent the classic valgus and procurvatum deformity, two blocking screws were placed in the proximal fragment. One screw was placed in the posterior half of the proximal fragment (viewed laterally) to block the nail from translating posteriorly, thereby preventing procurvatum. A second screw was placed in the lateral half of the proximal fragment (viewed on AP) to prevent the nail from translating laterally, thereby preventing valgus.' Blocking screws are placed on the concave side of the deformity to guide the nail centrally. For procurvatum (apex anterior), the nail tends to go posterior, so a posterior screw blocks this. For valgus (apex lateral), the nail tends to go lateral, so a lateral screw blocks this.

Question 1040

Topic: 2. Trauma

During the intramedullary nailing procedure, sequential flexible reaming was performed.

What is a recognized benefit of sequential flexible reaming during intramedullary nailing of a tibial diaphyseal fracture?

. It directly reduces the fracture fragments.
. It decreases the risk of fat embolization syndrome.
. It generates autologous bone graft (osteogenic reamings) that promotes secondary bone healing.
. It allows for a smaller diameter nail to be used.
. It eliminates the need for fluoroscopic guidance.

Correct Answer & Explanation

. It generates autologous bone graft (osteogenic reamings) that promotes secondary bone healing.

Explanation

Correct Answer: CThe case states: 'Sequential flexible reaming was performed in 0.5-millimeter increments. Reaming generates autologous bone graft (osteogenic reamings) that is deposited at the fracture site, promoting secondary bone healing.' This is a well-known biological advantage of reamed nailing. Reaming does not directly reduce the fracture (A), it can actually increase the risk of fat embolization (B), it allows for a larger diameter nail (D), and fluoroscopic guidance is still essential (E).

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