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 12641
Topic: Lower Extremity Trauma
A 42-year-old woman undergoes radiographs for a knee sprain, revealing an incidental finding in the distal femur:
She denies thigh pain. MRI confirms a well-circumscribed, lobulated cartilaginous lesion without endosteal scalloping or cortical breakthrough. What is the next best step in management?
Correct Answer & Explanation
. Clinical observation and serial radiographs
Explanation
The image demonstrates a classic asymptomatic enchondroma with typical 'popcorn' calcifications. Lesions without aggressive features (like deep endosteal scalloping or pain) are benign and should be managed with clinical observation.
Question 12642
Topic: 2. Trauma
A 13-year-old girl sustains a pelvic injury. 3D CT reconstructions demonstrate an acetabular fracture with extension into the sacroiliac joint and comminution along the posterior column. The defining feature that classifies this as a both-column fracture is:
Correct Answer & Explanation
. No articular surface remains attached to the intact axial skeleton
Explanation
Correct Answer: CThe fracture is a both-column fracture in the Judet/Letournel classification. Both the anterior and posterior columns are separately broken and displaced. However, the defining feature of a both-column pattern is that all articular fragments are on fracture fragments and no joint surface is left intact to the axial skeleton above.
Question 12643
Topic: 2. Trauma
A 19-year-old woman sustained the injury shown in the radiographs 6 weeks ago. A decision is made to proceed with surgical fixation. Why is a dorsal approach preferred over a volar approach for this specific fracture pattern?
Correct Answer & Explanation
. It provides better visualization and allows for perpendicular screw trajectory in proximal pole fractures.
Explanation
Correct Answer: BThe radiographs demonstrate a proximal third (proximal pole) scaphoid fracture. Proximal pole fractures are optimally approached via a dorsal approach to ensure proper reduction and allow for a compression screw to be placed perpendicular to the fracture plane. Fractures of the scaphoid waist can be approached either volarly or dorsally.
Question 12644
Topic: 2. Trauma
A 13-year-old girl sustained the pelvic injury shown in the provided 3D CT reconstructions. According to the Judet and Letournel classification, what is the defining radiographic feature that distinguishes this both-column fracture from other acetabular fracture patterns?
Correct Answer & Explanation
. No portion of the articular surface remains attached to the intact axial skeleton
Explanation
Correct Answer: CThe defining feature of a both-column acetabular fracture is that all articular fragments are detached from the intact axial skeleton (ilium/sacrum). While both the anterior and posterior columns are broken, the complete dissociation of the articular surface from the intact ilium is the hallmark of this specific fracture pattern.
Question 12645
Topic: 2. Trauma
An 82-year-old woman presents with the shoulder injury shown in the radiographs. She lives independently. A cemented hemiarthroplasty is planned. Which of the following factors is the primary reason for choosing hemiarthroplasty over open reduction and internal fixation (ORIF) in this specific patient?
Correct Answer & Explanation
. High risk of osteonecrosis and poor bone quality (osteopenia) compromising fixation
Explanation
Correct Answer: CThe patient has a displaced four-part proximal humerus fracture. Given her advanced age and the presence of osteopenia, the risk of osteonecrosis of the humeral head and failure of internal fixation is high. Therefore, a cemented hemiarthroplasty is the treatment of choice. ORIF may be indicated in younger individuals with good bone quality.
Question 12646
Topic: 2. Trauma
A 13-year-old girl sustains a pelvic injury in an ATV accident. 3D CT reconstructions are shown. According to the Judet-Letournel classification, which of the following is the defining characteristic of the fracture pattern demonstrated?
Correct Answer & Explanation
. All articular segments are detached from the intact axial skeleton (ilium).
Explanation
Correct Answer: CThe images demonstrate a both-column acetabular fracture. The defining feature of a both-column fracture in the Judet-Letournel classification is that all articular fragments are detached from the intact axial skeleton (the intact portion of the ilium attached to the sacrum). The 'spur sign' is often seen on the obturator oblique view, representing the intact portion of the ilium.
Question 12647
Topic: 2. Trauma
A 13-year-old girl sustains the pelvic injury shown in the provided 3D CT reconstructions. This fracture pattern is classified as a both-column acetabular fracture. What is the defining radiographic feature of this specific fracture pattern?
Correct Answer & Explanation
. All articular fragments are detached from the intact axial skeleton above.
Explanation
Correct Answer: CThe defining feature of a both-column acetabular fracture pattern is that all articular fragments are on fracture fragments and no joint surface is left intact to the axial skeleton above. While extension into the sacroiliac joint or comminution may be present, the complete detachment of the articular surface from the intact ilium is the hallmark of a both-column fracture.
Question 12648
Topic: Pelvic & Acetabular Trauma
Which of the following ligamentous complexes provides the most significant restraint to vertical displacement of the hemipelvis in a completely unstable pelvic ring injury?
Correct Answer & Explanation
. Posterior sacroiliac ligaments
Explanation
The intact posterior sacroiliac ligamentous complex is the most vital structure for maintaining vertical stability of the pelvic ring. Disruption of these ligaments results in vertical shear instability.
Question 12649
Topic: 2. Trauma
A 45-year-old man sustains a Schatzker VI bicondylar tibial plateau fracture treated with dual plating. At his 6-week follow-up, radiographs reveal a progressive varus collapse. What technical oversight during surgical fixation is most commonly associated with this specific complication?
Correct Answer & Explanation
. Failure to adequately reduce and buttress the posteromedial fragment
Explanation
Varus collapse in bicondylar tibial plateau fractures is frequently caused by a failure to recognize, anatomically reduce, and adequately buttress the posteromedial coronal shear fragment. This fragment is critical for restoring the medial column stability.
Question 12650
Topic: 2. Trauma
A 28-year-old male sustains a closed, mid-shaft femur fracture treated with a reamed, statically locked intramedullary nail. Which type of bone healing predominates in this scenario, and what is the underlying biomechanical principle?
Correct Answer & Explanation
. Secondary bone healing; relative stability and load sharing
Explanation
Intramedullary nailing is a load-sharing device that provides relative stability to the fracture site. This mechanical environment promotes secondary bone healing characterized by endochondral ossification and callus formation.
Question 12651
Topic: 2. Trauma
A 3-year-old boy weighing 15 kg sustains an isolated, closed, spiral fracture of the femoral shaft after a fall from a playground slide. What is the most appropriate definitive treatment for this patient?
Correct Answer & Explanation
. Early spica casting
Explanation
Correct Answer: BThe treatment of pediatric femoral shaft fractures is highly dependent on the age and weight of the child. For children aged 6 months to 4-5 years (preschool age), early spica casting is the standard of care for isolated, closed femur fractures with acceptable shortening (<2 cm). A Pavlik harness is indicated for infants less than 6 months of age. Flexible intramedullary nailing is the treatment of choice for school-aged children (typically 5 to 11 years old) weighing less than 50 kg (110 lbs). Rigid intramedullary nailing is reserved for older adolescents (typically >11 years) with closed physes or using a trochanteric entry to avoid the piriformis fossa and the risk of AVN. Plate fixation is an option but is generally reserved for specific indications such as polytrauma, open fractures, or when flexible nails are not suitable.
Question 12652
Topic: 2. Trauma
A 3-year-old boy weighing 16 kg sustains an isolated, closed, spiral fracture of the femoral shaft after a fall from a playground structure. What is the most appropriate definitive treatment?
Correct Answer & Explanation
. Early spica casting
Explanation
Correct Answer: Early spica castingThe treatment of pediatric femoral shaft fractures is dictated primarily by the patient's age and weight. For children aged 1 to 5 years (or weighing less than 20 kg), early spica casting is the gold standard and provides excellent outcomes with low complication rates. A Pavlik harness is indicated for infants less than 6 months of age. Flexible intramedullary nailing is the treatment of choice for children aged 5 to 11 years (or weighing between 20 kg and 50 kg). Rigid intramedullary nailing is reserved for older adolescents (typically > 11 years or > 50 kg) nearing skeletal maturity, using a lateral trochanteric entry to avoid avascular necrosis of the femoral head. Plate fixation is an option for specific fracture patterns (e.g., highly comminuted, length unstable) or in patients with polytrauma, but is not the standard first-line treatment for an isolated spiral fracture in a 3-year-old.
Question 12653
Topic: 2. Trauma
A 14-year-old boy sustains an ankle injury. Imaging reveals a triplane fracture of the distal tibia. Which of the following correctly describes the typical fracture planes seen in the coronal, sagittal, and axial planes respectively?
A triplane fracture is a complex transitional fracture of the distal tibia that occurs in adolescents as the physis is closing. It typically consists of three distinct fracture planes. On an anteroposterior (AP) radiograph (coronal plane), the fracture appears as a Salter-Harris II injury, with a vertical fracture line extending through the metaphysis. On a lateral radiograph (sagittal plane), it appears as a Salter-Harris III injury, with a vertical fracture line extending through the epiphysis. In the axial plane, the fracture propagates horizontally through the physis, connecting the metaphyseal and epiphyseal fracture lines. Therefore, the correct sequence is Coronal = Metaphysis, Sagittal = Epiphysis, and Axial = Physis. CT imaging is highly recommended to fully characterize the fracture fragments and plan for surgical reduction if displacement is > 2 mm.
Question 12654
Topic: 2. Trauma
A 4-year-old boy weighing 18 kg sustains a closed, isolated, length-stable spiral fracture of the middle third of the right femoral shaft after a fall from a playground structure. What is the most appropriate definitive treatment for this patient?
Correct Answer & Explanation
. B) Early spica casting
Explanation
Correct Answer: BThe treatment of pediatric femoral shaft fractures is highly dependent on the patient's age and weight. For a 4-year-old child weighing less than 20 kg with an isolated, length-stable fracture (< 2-3 cm of shortening), early spica casting is the gold standard and most appropriate definitive treatment. A Pavlik harness (Option A) is indicated for infants less than 6 months of age. Flexible intramedullary nailing (Option C) is the treatment of choice for children aged 5 to 11 years, or those weighing more than 20 kg, as they are too large for spica casting to be easily managed and have a higher risk of unacceptable shortening. Rigid antegrade intramedullary nailing (Option D) is contraindicated in young children due to the risk of avascular necrosis of the femoral head from injury to the ascending cervical branches of the medial femoral circumflex artery at the piriformis fossa. Plate fixation (Option E) is an option for length-unstable fractures or polytrauma but is not the first-line treatment for a stable fracture in an 18 kg 4-year-old.
Question 12655
Topic: 2. Trauma
An 11-year-old boy sustains a Meyers and McKeever Type III tibial eminence fracture. During arthroscopic or open reduction, which intra-articular structure is most commonly found entrapped beneath the fragment, preventing anatomic reduction?
Correct Answer & Explanation
. Anterior horn of the medial meniscus
Explanation
The anterior horn of the medial meniscus (or the transverse intermeniscal ligament) frequently becomes entrapped beneath the avulsed tibial eminence. It must be mobilized to achieve an anatomic reduction of the fragment.
Question 12656
Topic: 2. Trauma
An 8-year-old boy weighing 35 kg (77 lbs) sustains a closed, length-stable, transverse midshaft femur fracture after a fall. Which of the following is the most appropriate surgical treatment for this patient?
Correct Answer & Explanation
. Flexible intramedullary nailing
Explanation
Flexible intramedullary nailing is the gold standard for length-stable, transverse femur fractures in children aged 5-11 years weighing less than 50 kg (110 lbs). Rigid nailing with trochanteric or piriformis entry carries an unacceptably high risk of avascular necrosis of the femoral head in this age group.
Question 12657
Topic: Upper Extremity Trauma
A mass is excised from the olecranon bursa of a 55-year-old male. Gross examination reveals chalky white deposits. Histological examination using H&E staining shows large amorphous granular pink material surrounded by macrophages and multinucleated giant cells, but no distinct crystals are seen. Why are the crystals not visible on standard H&E preparation?
Correct Answer & Explanation
. They dissolve in aqueous formalin during routine tissue processing
Explanation
Monosodium urate crystals are water-soluble and dissolve in the aqueous formalin fixatives used for standard H&E processing. To visualize the actual crystals histologically, tissue must be fixed in absolute alcohol.
Question 12658
Topic: Upper Extremity Trauma
A patient undergoes surgical excision of a large chalky mass over the olecranon bursa
. To optimally preserve the diagnostic crystals for histological examination, which specific processing method must the pathologist utilize?
Correct Answer & Explanation
. Absolute alcohol fixation
Explanation
Monosodium urate crystals are water-soluble and will dissolve if placed in routine aqueous formalin. To properly preserve gouty tophi for histologic analysis, the tissue must be fixed in a non-aqueous solution, such as absolute alcohol.
Question 12659
Topic: 2. Trauma
What is the primary advantage of a hexapod external fixator (e.g., Taylor Spatial Frame) over acute corrective osteotomy and internal fixation for a severe multidirectional tibial deformity?
Correct Answer & Explanation
. Ability to adjust correction postoperatively without returning to the OR
Explanation
Hexapod frames allow for gradual, precise correction of complex multi-planar deformities. Their primary advantage is the ability to adjust the correction trajectory in the clinic via software input without additional surgery.
Question 12660
Topic: 2. Trauma
When performing fixator-assisted nailing (FAN) for tibial deformity correction, what is the primary role of the temporary external fixator?
Correct Answer & Explanation
. To acutely correct the deformity and hold alignment during reaming and nail insertion
Explanation
In FAN, an external fixator is used temporarily intraoperatively to achieve and strictly maintain the anatomic reduction. This provides a stable trajectory while the intramedullary canal is reamed and the nail is inserted.
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