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 1581
Topic: 2. Trauma
Which of the following is the most critical technical factor for achieving active forward elevation following a shoulder hemiarthroplasty for a 4-part proximal humerus fracture in an elderly patient?
Correct Answer & Explanation
. Anatomic reduction and healing of the greater tuberosity
Explanation
Tuberosity healing is the single most important predictor of functional outcome (specifically active forward elevation) in shoulder hemiarthroplasty for fractures. Failure of tuberosity union leads to severe cuff dysfunction and pseudoparalysis.
Question 1582
Topic: 2. Trauma
A 68-year-old osteopenic female sustains a fall from standing height, resulting in a displaced acetabular fracture. CT imaging reveals a pure posterior column fracture with significant comminution and medial displacement of the femoral head. Which of the following statements regarding the ilioinguinal approach for this patient is most accurate?
Correct Answer & Explanation
. It is a relative contraindication, as a posterior approach would be more appropriate.
Explanation
Correct Answer: CThe ilioinguinal approach is primarily designed for anterior column, anterior wall, and specific both-column fractures where the primary displacement is anterior and medial. It provides limited, if any, direct access to the posterior column. For a pure posterior column fracture, a posterior approach such as the Kocher-Langenbeck approach is far more appropriate as it provides direct visualization and access to the posterior column and posterior wall of the acetabulum. While the patient's age and bone quality are factors to consider, they are not absolute contraindications to surgery itself, but rather influence the choice of fixation and rehabilitation. Medial displacement of the femoral head can occur with anterior column fractures (e.g., quadrilateral plate involvement), which the ilioinguinal approach can address, but in the context of apure posterior column fracture, it is not the primary mechanism or indication for this approach. An irreducible hip dislocation is an indication for operative management, but the choice of approach would still be dictated by the fracture pattern.
Question 1583
Topic: 2. Trauma
A 40-year-old male presents with a complex acetabular fracture after a high-energy motor vehicle collision. Prior to definitive surgical planning via the ilioinguinal approach, which imaging modality is considered mandatory and provides the most detailed information regarding fracture lines, displacement, comminution, and intra-articular fragments?
Correct Answer & Explanation
. Computed Tomography (CT) scan with 3D reconstructions
Explanation
Correct Answer: CWhile plain radiographs (AP pelvis, iliac oblique, and obturator oblique views) are essential for initial assessment and Judet and Letournel classification, a Computed Tomography (CT) scan with 3D reconstructions is considered mandatory for complex acetabular fractures. CT provides unparalleled detailed information regarding fracture lines, displacement, comminution, impaction, and the presence of intra-articular fragments, which is critical for accurate classification, surgical planning, and anticipating reduction maneuvers. MRI is useful for assessing soft tissue injuries, cartilage damage, or occult fractures but is not the primary imaging modality for bony fracture morphology in the acute setting. Selective angiography may be considered for suspected major vascular injury or difficult reoperations but is not routinely mandatory. Ultrasound has limited utility for detailed bony fracture assessment.
Question 1584
Topic: 2. Trauma
A 28-year-old male undergoes successful open reduction and internal fixation of a displaced anterior column acetabular fracture via the ilioinguinal approach. The fixation is deemed stable intraoperatively. What is the most appropriate initial weight-bearing status for the affected extremity in the immediate post-operative period (Days 0-7)?
Correct Answer & Explanation
. Touch-down weight-bearing (10-15 kg) or non-weight bearing
Explanation
Correct Answer: CFollowing open reduction and internal fixation of acetabular fractures, even with stable fixation, the standard post-operative protocol typically involves non-weight bearing (NWB) or touch-down weight bearing (TDWB) (10-15 kg) on the affected extremity for an extended period, usually 8-12 weeks. This allows for initial fracture healing and prevents excessive stress on the fixation construct, which could lead to hardware failure, loss of reduction, or delayed union. Early full or partial weight-bearing is generally contraindicated for complex acetabular fractures. Progressive weight-bearing is initiated only after radiographic evidence of fracture healing and clinical stability, usually in the intermediate rehabilitation phase.
Question 1585
Topic: 2. Trauma
The image below shows definitive fixation of an acetabular fracture. In the context of an anterior column fracture managed via the ilioinguinal approach, what is the primary biomechanical purpose of placing a plate along the pelvic brim and potentially a separate plate or lag screws to buttress the quadrilateral surface?
Correct Answer & Explanation
. To restore the spherical shape of the acetabulum, maintain congruity, and prevent medialization of the femoral head.
Explanation
Correct Answer: CThe primary biomechanical purpose of anatomical reduction and rigid internal fixation of acetabular fractures, particularly with plates along the pelvic brim and buttressing of the quadrilateral surface, is to restore the spherical shape of the acetabulum, maintain congruity with the femoral head, and prevent secondary displacement. Specifically, buttressing the quadrilateral surface is crucial to resist medial displacement of the femoral head, which is a common and debilitating consequence of anterior column and both-column fractures involving this medial wall. This stable construct allows for early, controlled range of motion and optimizes load distribution, thereby mitigating the risk of post-traumatic arthritis. While stable fixation is a prerequisite for eventual weight-bearing, it does not immediately facilitate early weight-bearing. The plates are not primarily for posterior column stability (which is addressed by posterior approaches) or for bone graft scaffolding, nor do they directly protect the neurovascular bundle from screw penetration (which is achieved by careful screw length measurement and trajectory).
Question 1586
Topic: 2. Trauma
A 38-year-old male presents with a comminuted mid-diaphyseal femoral shaft fracture following a high-energy motor vehicle collision. He is hemodynamically stable, and the fracture is closed. The surgical team is debating between an intramedullary nail (IMN) and a plate for definitive fixation. Considering the biomechanical principles discussed in the case, which of the following statements accurately describes a key advantage of an IMN over a plate for this specific fracture?
Correct Answer & Explanation
. IMNs are placed close to the neutral axis of the bone, allowing them to share axial loads and minimize bending moments.
Explanation
Correct Answer: CThe correct answer is C because intramedullary nails (IMNs) are load-sharing devices designed to be placed centrally within the medullary canal, close to the neutral axis of the bone. This central placement allows them to share axial compressive loads with the bone, which minimizes bending moments at the fracture site. This load-sharing characteristic promotes Wolff's Law, encouraging bone remodeling and reducing the degree of stress shielding compared to plates, which are load-bearing and placed eccentrically on the bone surface. Plates, due to their eccentric placement, bear the majority of the load and create significant bending moments, leading to more pronounced stress shielding.Option A is incorrect because IMNs derive their stiffness from their diameter and material properties, but their primary biomechanical advantage is load sharing due to central placement, not superior bending stiffness from eccentric placement (which is characteristic of plates). Option B is incorrect as it reverses the roles: IMNs are load-sharing, and plates are load-bearing. Option D is incorrect; while plates can provide good rotational stability, IMNs achieve excellent rotational stability, especially in comminuted fractures, through interlocking screws. Option E is incorrect; IMNs are typically inserted with minimal soft tissue dissection (indirect reduction techniques), which is a significant biological advantage over plates that often require more extensive exposure and periosteal stripping.
Question 1587
Topic: 2. Trauma
A 25-year-old male sustains a Gustilo-Anderson Type II open tibial shaft fracture with moderate contamination. After thorough debridement and irrigation, the orthopedic surgeon plans for definitive fixation with an intramedullary nail. During pre-operative planning, the surgeon considers the decision between reamed and unreamed nailing. Based on the case discussion, what is the most accurate statement regarding reaming in this scenario?
Correct Answer & Explanation
. Reaming allows for the insertion of a larger, stiffer nail, enhancing mechanical stability, but may temporarily compromise endosteal blood supply.
Explanation
Correct Answer: BThe correct answer is B. Reaming the medullary canal prepares a larger diameter canal, allowing for the insertion of a larger, stiffer nail. This enhances mechanical stability and improves bone-nail contact (fit-and-fill). However, reaming does temporarily compromise the endosteal blood supply, which is a consideration, especially in open fractures where soft tissue and periosteal blood supply may already be compromised. Despite this, modern reaming techniques, often employing low-pressure, high-volume irrigation, have minimized the concern for endosteal compromise, making reamed nails acceptable and often preferred in many Gustilo Type I/II open fractures due to their superior mechanical stability and potential to accelerate union.Option A is incorrect. While unreamed nails were historically preferred for open fractures to preserve endosteal blood flow, current evidence suggests reamed nails are acceptable for Gustilo Type I/II open fractures. Option C is incorrect; while reaming carries a theoretical risk of fat embolism, it is not an absolute contraindication for all open fractures, and the risk is managed with careful technique. Option D is incorrect; reaming allows for a larger nail, which generally provides better fit-and-fill than an unreamed nail, which is limited by the native canal diameter. Option E is incorrect; reaming does impact endosteal blood supply, though the effect is often transient and minimized by modern techniques; it's not universally superior in all contexts without consideration of the temporary compromise.
Question 1588
Topic: 2. Trauma
A 62-year-old female with severe osteopenia sustains a highly comminuted distal tibia (pilon) fracture with significant soft tissue swelling. Due to her comorbidities and the soft tissue status, an external fixator is chosen as a temporizing measure. The surgeon aims to achieve maximal frame rigidity to protect the fracture site. Which of the following modifications would contribute MOST significantly to increasing the rigidity of the external fixator construct?
Correct Answer & Explanation
. Employing a biplanar or multiplanar pin configuration with larger diameter pins.
Explanation
Correct Answer: EThe correct answer is E. Frame rigidity in an external fixator is significantly influenced by several factors. Employing a biplanar or multiplanar pin configuration (e.g., placing pins in different anatomical planes) provides significantly more rigidity than a uniplanar setup. Additionally, using larger diameter pins (e.g., 5mm or 6mm Schanz pins instead of 4mm) directly increases the stiffness and pull-out strength of the pin-bone interface, thereby enhancing overall frame rigidity. These two factors combined offer the most substantial increase in construct stiffness.Option A is incorrect; carbon fiber rods are generally more flexible than stainless steel or aluminum rods of the same diameter, though they are radiolucent and lighter. Option B is incorrect; the closer the frame is to the bone, the stiffer the construct. Increasing the distance reduces rigidity. Option C is incorrect; uniplanar frames offer limited rotational control and are less rigid than multiplanar frames. Option D is incorrect; decreasing the pin diameter would reduce the stiffness and pull-out strength of the pins, thereby decreasing overall frame rigidity.
Question 1589
Topic: 2. Trauma
A 45-year-old male underwent intramedullary nailing for a mid-diaphyseal tibial fracture. Six months post-operatively, radiographs show minimal callus formation and persistent fracture line, indicating a delayed union. The nail was initially statically locked proximally and distally. Based on the principles of IMN performance and management of delayed unions, what is the most appropriate next step to stimulate healing?
Correct Answer & Explanation
. Dynamize the nail by removing a single locking screw to allow controlled axial micromotion.
Explanation
Correct Answer: CThe correct answer is C. Dynamization is a well-established strategy for managing delayed unions in fractures treated with statically locked intramedullary nails. By removing one of the locking screws (typically a distal screw, but sometimes a proximal one depending on the fracture pattern and nail design), controlled axial micromotion is introduced at the fracture site. This micromotion provides a mechanical stimulus that encourages callus formation and secondary bone healing, which is often inhibited by excessive rigidity (stress shielding) in a statically locked construct. The case specifically mentions dynamization as a method to encourage callus formation.Option A is incorrect; converting to an external fixator would be a more invasive and complex procedure, typically reserved for failed IMN with infection or severe nonunion, not a primary step for delayed union. Option B is incorrect; exchange nailing for delayed union/nonunion typically involves inserting alargerdiameter nail (if possible) to ream the canal, stimulate bone, and provide increased stability and fit-and-fill, not a smaller one. Option D is incorrect; adding a compression plate would further increase rigidity and stress shielding, which is counterproductive for a delayed union needing micromotion. Option E is incorrect; immediately removing the nail without addressing the nonunion and providing stabilization would lead to fracture instability and likely re-fracture.
Question 1590
Topic: 2. Trauma
A 55-year-old male with a comminuted open distal tibia fracture (Gustilo-Anderson Type IIIB) is managed with a temporary external fixator. Two weeks post-operatively, he develops increasing pain, erythema, and purulent drainage around one of the Schanz pin sites. The pin is not loose, and the patient is afebrile. Based on the case, what is the most appropriate initial management strategy for this complication?
Correct Answer & Explanation
. Daily meticulous pin care with sterile saline or antiseptic solution and initiation of oral antibiotics.
Explanation
Pin tract infection is the most common complication of external fixators. For superficial infections, which this presentation suggests (pain, erythema, purulent drainage, but pin not loose and patient afebrile), meticulous local pin care combined with oral antibiotics is the appropriate initial management. This aims to control the infection locally and prevent progression to a deeper infection or osteomyelitis.
Question 1591
Topic: 2. Trauma
A 30-year-old male presents with a comminuted subtrochanteric femoral fracture. The surgeon plans for antegrade intramedullary nailing. During the surgical approach, the choice of entry portal is critical to minimize complications. Based on the case, which entry portal is increasingly popular for femoral nailing but may be associated with a higher incidence of post-operative hip pain?
Correct Answer & Explanation
. Greater trochanteric tip entry, through the vastus lateralis and gluteus medius.
Explanation
Correct Answer: BThe correct answer is B. The case explicitly states that the 'Greater Trochanteric Tip' entry is increasingly popular, through the vastus lateralis and gluteus medius. It is noted to have less risk to the superior gluteal neurovascular bundle and potentially easier access, but 'May be associated with higher rates of hip pain.' This hip pain is often attributed to irritation of the gluteus medius or trochanteric bursitis.Option A, the piriformis fossa entry, is the traditional entry point and is also through the gluteus medius, but it carries a risk to the superior gluteal neurovascular bundle and is not specifically highlighted as having a higher incidence of hip pain compared to the GT tip in the text. Options C and D are entry portals for tibial nailing, not femoral. Option E is an entry portal for retrograde humeral nailing, not femoral.
Question 1592
Topic: 2. Trauma
A 42-year-old male polytrauma patient presents to the emergency department after a high-speed motor vehicle collision. He has a Glasgow Coma Scale (GCS) of 10, a significant base deficit of 8, and an open Gustilo-Anderson Type IIIC tibial plateau fracture with associated vascular injury. After initial resuscitation and vascular repair, the orthopedic team must decide on the initial fracture stabilization strategy. Based on the principles of Damage Control Orthopedics (DCO) and open fracture management, what is the most appropriate initial approach?
Correct Answer & Explanation
. Initial stabilization with an external fixator as part of damage control orthopedics (DCO).
Explanation
The patient's presentation with a GCS of 10, a significant base deficit, and an open Gustilo-Anderson Type IIIC fracture with vascular injury are all classic indications for Damage Control Orthopedics (DCO). An external fixator provides rapid, temporary stabilization with minimal additional physiological insult, allowing for patient resuscitation and soft tissue recovery before definitive fixation.
Question 1593
Topic: Lower Extremity Trauma
A 50-year-old female requires an intramedullary nail for a pathological femoral shaft fracture due to metastatic disease. She has a known allergy to nickel, which is a component in some stainless steel alloys. When selecting the IMN material, which of the following statements regarding material science is most relevant to her case?
Correct Answer & Explanation
. Titanium alloys (Ti-6Al-4V) are generally preferred due to their superior biocompatibility and lower elastic modulus, closer to bone.
Explanation
Correct Answer: BThe correct answer is B. The case explicitly states that 'Titanium alloys (e.g., Ti-6Al-4V) offer superior biocompatibility, lower elastic modulus (closer to bone, reducing stress shielding), and improved fatigue resistance.' This makes titanium a preferred choice, especially in patients with metal sensitivities or when minimizing stress shielding is a concern. Given the patient's nickel allergy, titanium alloys would be the safer and more appropriate choice due to their superior biocompatibility and lack of nickel.Option A is incorrect; stainless steel (316L) contains nickel and has a higher elastic modulus than titanium, leading to more stress shielding. Option C is incorrect; the choice of material significantly impacts fatigue resistance and stress shielding, as detailed in the case. Option D is incorrect; while stainless steel is strong, titanium alloys also offer excellent strength and fatigue resistance, and the relative strength can depend on specific alloy and design. Option E is incorrect; HA-coated pins are discussed in the context of external fixators to improve the bone-pin interface, not typically for IMNs.
Question 1594
Topic: 2. Trauma
A 68-year-old male undergoes intramedullary nailing for a comminuted intertrochanteric femoral fracture, utilizing a cephalomedullary (recon) nail. Post-operatively, he complains of persistent, localized pain over the lateral aspect of his hip, particularly with ambulation and lying on that side. Radiographs show appropriate nail and screw placement. Based on the common complications of IMN, what is the most likely cause of his pain?
Correct Answer & Explanation
. Entry portal pain, specifically associated with the greater trochanteric entry.
Explanation
Correct Answer: DThe correct answer is D. The case specifically lists 'Entry Portal Pain (Femur)' with an incidence of 10-25% for the greater trochanteric entry. This pain is typically localized over the lateral aspect of the hip and can be exacerbated by activity or direct pressure. While the piriformis fossa entry is also a femoral entry, the greater trochanteric tip entry is more commonly associated with this specific complication, often due to irritation of the gluteus medius tendon or trochanteric bursa by the nail or prominent hardware.Option A is incorrect; distraction at the fracture site would typically manifest as delayed union or nonunion, not primarily as localized hip pain, and is less likely with a recon nail designed for proximal femoral fractures. Option B is incorrect; fat embolism syndrome is a rare but severe systemic complication, not localized hip pain, and typically occurs acutely post-injury or surgery. Option C is incorrect; an iatrogenic fracture would be evident on radiographs and would present with acute pain and instability, not persistent localized hip pain. Option E is incorrect; while infection is a possibility, the patient's symptoms (localized pain, no fever, appropriate hardware placement) are more consistent with entry portal pain than a deep-seated infection, which would typically involve systemic signs or more severe local inflammation.
Question 1595
Topic: 2. Trauma
A 35-year-old male presents with a displaced mid-diaphyseal femoral shaft fracture. The orthopedic surgeon is planning for antegrade intramedullary nailing. During pre-operative templating, which of the following parameters is MOST critical to accurately assess to ensure optimal fit-and-fill and prevent cortical impingement?
Correct Answer & Explanation
. The medullary canal diameter at the narrowest isthmus on both AP and lateral views.
Explanation
Correct Answer: CThe correct answer is C. The case emphasizes that for intramedullary nails, templating involves measuring the 'Diameter: Measure the medullary canal at the narrowest isthmus on AP and lateral views. Plan for appropriate reaming.' This is crucial for achieving optimal 'fit-and-fill' (nail diameter close to canal diameter), which maximizes contact with the endosteum, enhancing stability and load transfer, and preventing iatrogenic fracture or cortical impingement. Accurate measurement of the diameter ensures the selection of an appropriately sized nail and guides the reaming process.Option A, bone mineral density, is important for overall bone health but not the most critical templating parameter for nail selection and fit-and-fill. Option B, the exact length of the contralateral uninjured femur, is critical for determining the correct nail length to restore limb length, but not for fit-and-fill or preventing cortical impingement. Option D, BMI, is a general patient factor but not a direct templating parameter for nail dimensions. Option E, femoral neck anteversion, is important for hip biomechanics but not directly for templating the diaphyseal nail's fit-and-fill or preventing cortical impingement in the shaft.
Question 1596
Topic: 2. Trauma
A 60-year-old female presents with a distal radius fracture. Radiographs show a dorsally displaced, extra-articular fracture with 10 degrees of dorsal angulation, 4 mm of radial shortening, and 18 degrees of radial inclination. She has no neurovascular deficits. She is a low-demand individual with well-controlled diabetes. Based on the case, which of the following is the MOST appropriate initial management strategy?
Correct Answer & Explanation
. Closed reduction and cast immobilization, with close follow-up for radiographic parameters.
Explanation
Correct Answer: BThe case outlines non-operative indications: 'Non-operative management, typically involving closed reduction and cast immobilization, is generally reserved for: Stable fractures: Minimally displaced, extra-articular fractures. Reducible fractures... Elderly, low-demand patients... Acceptable parameters post-reduction: Radial inclination >15°, Volar tilt (or neutral, up to 10° dorsal tilt in very elderly), Radial shortening <3-5 mm, Intra-articular step-off/gap <1-2 mm (if present), No significant DRUJ instability after reduction.' This patient has an extra-articular fracture, 10 degrees of dorsal angulation (which is within the acceptable range for an elderly, low-demand patient), 4 mm of radial shortening (within the <3-5 mm acceptable range), and 18 degrees of radial inclination (above the >15° threshold). Her low-demand status and controlled comorbidities further support non-operative management as an initial strategy, with close monitoring for any loss of reduction.Option A (Immediate ORIF) is incorrect because her fracture parameters fall within the acceptable range for non-operative management, especially given her low demand. Dorsal angulation >0-5° is a common threshold for operative intervention in active patients, but the case allows up to 10° dorsal tilt in very elderly/low-demand patients.Option C (External fixation) is typically reserved for highly comminuted, unstable fractures, or open fractures, which is not the case here.Option D (Percutaneous K-wire fixation) is an operative technique, and the initial parameters suggest non-operative management is appropriate.Option E (Wrist arthrodesis) is a salvage procedure for severe arthritis or instability, not an initial treatment for an acute fracture.
Question 1597
Topic: 2. Trauma
A 58-year-old female presents with a distal radius fracture. Radiographs show a dorsally displaced, extra-articular fracture with 5 degrees of dorsal angulation, 2 mm of radial shortening, and 20 degrees of radial inclination. She is an active, high-demand individual. Based on the case, which of the following is the MOST compelling reason to consider operative intervention for this patient?
Correct Answer & Explanation
. The presence of 5 degrees of dorsal angulation, especially in an active, high-demand patient.
Explanation
Correct Answer: BThe case outlines operative indications: 'Unstable fractures: ... Loss of volar tilt (dorsal angulation >0-5° is a common threshold for operative intervention, especially in active patients).' It also states: 'Young, high-demand patients: A lower threshold for operative intervention is often adopted to optimize long-term function and minimize the risk of post-traumatic arthritis.' While 5 degrees of dorsal angulation might be acceptable in a low-demand elderly patient, for an active, high-demand 58-year-old, this degree of dorsal angulation (loss of volar tilt) is a compelling reason to consider surgery to ensure optimal anatomical restoration and long-term function.Option A (Her age) is incorrect. Age alone is not an absolute indication for surgery; patient demand and fracture characteristics are more important. The case describes a bimodal distribution and different thresholds for elderly vs. young/active patients.Option C (2 mm of radial shortening) is incorrect. The operative threshold for radial shortening is typically >3-5 mm. 2 mm is within acceptable non-operative parameters.Option D (Extra-articular nature) is incorrect. Extra-articular fractures can be stable and managed non-operatively if parameters are acceptable. It's intra-articular fractures with significant step-off that are often inherently unstable and require surgery.Option E (20 degrees of radial inclination) is incorrect. Normal radial inclination is 22-23 degrees, and >15 degrees is considered acceptable for non-operative management. 20 degrees is well within the normal/acceptable range and does not indicate severe deformity.
Question 1598
Topic: 2. Trauma
During a Kocher-Langenbeck approach for a posterior acetabular fracture, the surgeon must protect the deep branch of the medial circumflex femoral artery (MCFA). Preservation of which of the following structures is most critical to protect this vessel?
Correct Answer & Explanation
. Obturator externus tendon
Explanation
The deep branch of the MCFA courses anterior to the quadratus femoris and posterior/inferior to the obturator externus. Maintaining the obturator externus intact during the Kocher-Langenbeck approach protects the primary blood supply to the femoral head.
Question 1599
Topic: 2. Trauma
According to the Letournel classification of acetabular fractures, which of the following fracture patterns is uniquely characterized by the radiographic "spur sign" on an obturator oblique view?
Correct Answer & Explanation
. Both-column fracture
Explanation
The "spur sign" is pathognomonic for a both-column acetabular fracture. It represents the intact portion of the ilium that remains attached to the axial skeleton after both columns have been completely detached.
Question 1600
Topic: 2. Trauma
A 25-year-old polytrauma patient sustains a high-energy comminuted midshaft femur fracture. Which of the following is the most sensitive and appropriate imaging modality for diagnosing an occult ipsilateral femoral neck fracture in this patient?
Correct Answer & Explanation
. Fine-cut computed tomography (CT) scan of the pelvis/hip
Explanation
A fine-cut CT scan through the femoral neck is the standard of care for ruling out an occult ipsilateral femoral neck fracture in high-energy femoral shaft fractures. It detects up to 90% of occult fractures that plain radiographs miss.
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