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2. Trauma MCQs

Practice Set 285 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 5681

Topic: 2. Trauma

A 65-year-old active female sustains a comminuted intra-articular distal humerus fracture (AO/OTA 13-C3) after a fall. She is neurovascularly intact.

Given her age and activity level, what is the preferred surgical approach to achieve a durable functional outcome?

. Open reduction and internal fixation (ORIF) with dual plating using perpendicular constructs.
. Total elbow arthroplasty (TEA).
. Excision arthroplasty (fascial interposition).
. Non-operative management with a long arm cast.
. ORIF with a single lateral plate.

Correct Answer & Explanation

. Open reduction and internal fixation (ORIF) with dual plating using perpendicular constructs.

Explanation

The patient has a comminuted intra-articular distal humerus fracture (AO/OTA 13-C3), which is a complex fracture involving both columns of the distal humerus and the articular surface. The goal of treatment is to restore anatomical alignment, stability, and a smooth articular surface to allow for early motion and prevent post-traumatic arthritis.For an active 65-year-old, preserving native elbow mechanics is paramount. Open reduction and internal fixation (ORIF) with dual plating using perpendicular constructs (Option A) is considered the gold standard for these complex fractures in patients with good bone quality who are active. This technique provides the necessary stability to allow for early rehabilitation and optimize long-term functional outcomes. The perpendicular plates (often a medial column plate and a posterior or posterolateral plate) create a strong construct, resisting forces in multiple planes.Total elbow arthroplasty (TEA) (Option B) is an option for distal humerus fractures, particularly in elderly, low-demand patients with osteoporotic bone or in cases of nonunion/malunion, where ORIF is unlikely to succeed. However, for an 'active' 65-year-old with presumably reasonable bone quality, preserving the native joint via ORIF is generally preferred, as TEAs have limitations in activity level and longevity.Excision arthroplasty (Option C) leads to a flail and unstable elbow with poor function and is typically reserved for salvage in very low-demand, non-reconstructible cases, or severe infection.Non-operative management (Option D) is generally not indicated for comminuted intra-articular fractures in active adults, as it often leads to severe stiffness, pain, and malunion/nonunion.ORIF with a single lateral plate (Option E) is insufficient for a 13-C3 fracture, which involves both columns. Adequate fixation requires addressing both medial and lateral columns, usually with dual plating.

Question 5682

Topic: 2. Trauma
A 45-year-old male sustains a high-energy pelvic injury in a motorcycle accident. Initial assessment shows hemodynamic stability after resuscitation. AP pelvis radiograph reveals a widely displaced symphysis pubis and bilateral sacral fractures involving Zone II (Denis classification). A CT scan confirms posterior ligamentous injury and sacroiliac joint disruption. Which of the following fixation constructs is generally considered the most stable for this type of injury?
. Symphyseal plating alone.
. Anterior external fixator with sacral iliosacral screws.
. Symphyseal plating with bilateral sacroiliac (SI) screw fixation.
. Posterior tension band plating of the sacrum.
. Isolated anterior external fixator.

Correct Answer & Explanation

. Symphyseal plating with bilateral sacroiliac (SI) screw fixation.

Explanation

This patient has a mechanically unstable pelvic ring injury, specifically a Young-Burgess APC III (widely displaced symphysis) or possibly a combined vertical shear (if there is vertical displacement, which is implied by 'sacroiliac joint disruption'). The presence of a widely displaced symphysis pubis (anterior injury) and bilateral sacral Zone II fractures with posterior ligamentous injury (posterior injury) indicates both anterior and posterior ring instability. Effective stabilization of unstable pelvic ring injuries requires addressing both the anterior and posterior disruptions. Option A (Symphyseal plating alone) only addresses the anterior instability and leaves the posterior instability unaddressed, leading to continued pelvic instability. Option B (Anterior external fixator with sacral iliosacral screws) is a good option. An anterior external fixator provides anterior stabilization, and iliosacral screws provide robust posterior fixation. This is a common and effective construct for this type of injury. Option C (Symphyseal plating with bilateral sacroiliac (SI) screw fixation) is generally considered the most stable and definitive fixation construct for severe anterior and posterior pelvic ring instability. Symphyseal plating provides strong compression and stability across the pubic symphysis. Bilateral SI screw fixation provides excellent stability for sacral fractures and SI joint disruptions, which are critical for restoring posterior pelvic ring integrity. While external fixation (Option B) can be effective, internal plating and screw fixation are often biomechanically superior and preferred for definitive management in stable patients. Option D (Posterior tension band plating of the sacrum) is a technique for certain types of sacral fractures, but it may not provide sufficient stability for bilateral sacral fractures with SI joint disruption, and it does not address the anterior injury. Option E (Isolated anterior external fixator) only addresses the anterior injury and is insufficient for posterior instability, similar to option A.

Question 5683

Topic: Lower Extremity Trauma

A 42-year-old active male presents with medial knee pain and a varus deformity. Standing full-length radiographs confirm genu varum with mechanical axis deviation of 10mm into the medial compartment. There is isolated medial compartment osteoarthritis. The surgeon plans a medial opening wedge high tibial osteotomy (HTO). During the planning, what is the primary radiographic parameter used to achieve optimal load transfer through the lateral compartment?

. Weight-bearing line passing through the lateral third of the tibial plateau.
. Restoration of the anatomical femorotibial angle to 175 degrees.
. Achieving a HKA (Hip-Knee-Ankle) angle of 183 degrees.
. Correction of the medial proximal tibial angle (MPTA) to 90 degrees.
. Targeting an overcorrection to 5 degrees of valgus.

Correct Answer & Explanation

. Weight-bearing line passing through the lateral third of the tibial plateau.

Explanation

The goal of a medial opening wedge high tibial osteotomy (HTO) for isolated medial compartment osteoarthritis and genu varum is to shift the mechanical load from the diseased medial compartment to the healthier lateral compartment. This is achieved by creating a slight valgus alignment of the limb.Option A (Weight-bearing line passing through the lateral third of the tibial plateau) is the correct target. The weight-bearing line (or mechanical axis) connects the center of the femoral head to the center of the ankle. For HTO, the aim is to shift this line laterally. Passing it through the lateral third of the tibial plateau (typically 62-65% of the tibial width from medial) ensures sufficient unloading of the medial compartment and optimal load transfer through the healthier lateral compartment, maximizing the longevity of the osteotomy.Option B (Restoration of the anatomical femorotibial angle to 175 degrees) refers to the anatomical axis, not the mechanical axis, and doesn't directly dictate load transfer.Option C (Achieving a HKA (Hip-Knee-Ankle) angle of 183 degrees) describes a valgus alignment, but the specific target is more precisely defined by the weight-bearing line's position on the tibial plateau rather than a generic HKA angle. While 183 degrees indicates 3 degrees of mechanical valgus, the target zone for the weight-bearing line is more refined.Option D (Correction of the medial proximal tibial angle (MPTA) to 90 degrees) is an angle used in planning but is not the primary measure for final load distribution. A specific MPTA is targeted to achieve the desired mechanical axis shift, but the ultimate goal is where the weight-bearing line falls.Option E (Targeting an overcorrection to 5 degrees of valgus) is a general statement about valgus correction. While overcorrection into valgus is intended, the specific endpoint is defined by the weight-bearing line's position, not just a degree of valgus, and 5 degrees might be too much or too little for an individual patient, depending on their specific anatomy and desired load shift.

Question 5684

Topic: 2. Trauma

A 38-year-old male presents with a persistent painful tibial shaft nonunion 12 months after initial intramedullary nailing for a comminuted fracture. Radiographs

show sclerotic bone ends and no bridging callus. Infection workup (ESR, CRP, aspiration) is negative. He is a non-smoker. He has previously undergone nail exchange without success. What is the most appropriate next step in management for this refractory nonunion?

. Another intramedullary nail exchange with reaming and bone grafting.
. Plate fixation with bone grafting.
. External fixator with bone transport (Ilizarov technique).
. Pulsed electromagnetic field (PEMF) stimulation.
. Amputation.

Correct Answer & Explanation

. External fixator with bone transport (Ilizarov technique).

Explanation

This patient has a chronic, refractory tibial shaft nonunion (12 months, painful, sclerotic bone ends - indicating a hypertrophic/oligotrophic nonunion) after failing two previous attempts at intramedullary nailing. The infection workup is negative, and he is a non-smoker, removing common hindrances to healing. Since nail exchange has already failed once, simply repeating it (Option A) is unlikely to be successful without a more aggressive biological or mechanical intervention.Option B (Plate fixation with bone grafting) is a viable option for a nonunion, offering strong fixation and facilitating bone grafting. However, for arefractorynonunion that has failed IM nailing twice, particularly a comminuted fracture, the challenge may be significant bone defect or persistent poor biology. Plate fixation can be associated with higher rates of infection in the tibia compared to nailing.Option C (External fixator with bone transport - Ilizarov technique) is often considered a highly effective method for refractory tibial nonunions, especially those with significant bone loss, deformity, or persistent poor biology that has failed other treatments. The Ilizarov method provides excellent stability, allows for gradual correction of deformity, compression at the nonunion site, and stimulates bone regeneration (distraction osteogenesis) to fill bone gaps and promote healing. This technique is particularly well-suited for cases where the bone ends are sclerotic and revascularization is a challenge, as it brings new, viable bone to the nonunion site. Given the failure of two IM nailing attempts, a more biologically potent and mechanically adaptable approach like the Ilizarov method is warranted.Option D (Pulsed electromagnetic field (PEMF) stimulation) is a non-invasive adjunct therapy that can be used for nonunions, but it is typically used in conjunction with stable fixation or as a standalone treatment for early, less refractory nonunions. It is unlikely to be successful as a primary treatment for a complex nonunion that has failed two surgical interventions.Option E (Amputation) is a salvage procedure for limb-threatening conditions or failed multiple reconstructions and is not indicated as the next step for a refractory nonunion that still has limb salvage potential.

Question 5685

Topic: 2. Trauma
A 28-year-old male involved in a high-speed motor vehicle collision presents with multiple injuries: a grade III open tibia fracture, a closed femoral shaft fracture, a displaced intra-articular calcaneus fracture, and severe blunt abdominal trauma with ongoing hemodynamic instability requiring massive transfusion. His initial GCS is 10, and his base deficit is -8. After initial resuscitation, what is the most appropriate early orthopedic management strategy?
. Immediate definitive fixation of all fractures (Femur IMN, Tibia ORIF, Calcaneus ORIF).
. Damage control orthopedics (DCO) with external fixation of the tibia and femur, and temporizing calcaneal management.
. Amputation of the leg with the open tibia fracture.
. Placement of skeletal traction for the femur and tibia, with splinting for the calcaneus.
. Extensive débridement of the open tibia fracture, followed by definitive fixation of the tibia, and observation of other fractures.

Correct Answer & Explanation

. Damage control orthopedics (DCO) with external fixation of the tibia and femur, and temporizing calcaneal management.

Explanation

This patient is a polytrauma victim with severe injuries, including a Grade III open tibia fracture, a femoral shaft fracture, and severe blunt abdominal trauma resulting in ongoing hemodynamic instability requiring massive transfusion, a low GCS (10), and a significant base deficit (-8). These are clear indicators of severe physiological derangement and make him a 'borderline' or 'compromised' patient according to Damage Control Orthopedics (DCO) principles. Option A (Immediate definitive fixation of all fractures) is inappropriate and potentially dangerous. This 'early total care' approach would subject a physiologically unstable patient to prolonged surgery, increasing the risk of the 'second hit' phenomenon, worsening systemic inflammation, and potentially leading to multiple organ failure or death. It is contraindicated in this scenario. Option B (Damage control orthopedics (DCO) with external fixation of the tibia and femur, and temporizing calcaneal management) is the most appropriate strategy. DCO involves quick, temporary stabilization of long bone and pelvic fractures, typically with external fixators, to control hemorrhage, pain, and prevent further tissue damage. This allows the surgical team to address life-threatening injuries (like abdominal trauma) and stabilize the patient's physiology. Definitive fixation is then performed in a delayed fashion once the patient is physiologically stable. The open tibia fracture needs irrigation and debridement, and an external fixator would provide temporary stabilization. The calcaneal fracture, being intra-articular, is not emergent and can be managed with temporizing measures (e.g., splinting) until the patient's condition stabilizes. Option C (Amputation) is a salvage procedure and is not indicated as the initial management unless the limb is unsalvageable or poses an immediate threat to life that cannot be managed by other means. Option D (Skeletal traction) is a temporizing measure for long bone fractures but is less stable than external fixation and may not adequately control pain or allow for easy patient mobilization in a polytrauma setting, especially for an open fracture. It also doesn't address the need for surgical debridement of the open fracture. Option E (Extensive débridement of the open tibia fracture, followed by definitive fixation of the tibia, and observation of other fractures) is problematic. While debridement of the open fracture is crucial, definitive fixation of the tibia in a hemodynamically unstable patient can still be a 'second hit.' The definitive fixation should be delayed, and other fractures should also be temporized, not just observed.

Question 5686

Topic: 2. Trauma

A 45-year-old male sustains a high-energy trauma, resulting in an unstable pelvic ring injury classified as a Young-Burgess Type II APC (Anteroposterior Compression). Neurological examination reveals a partial L5-S1 radiculopathy on the affected side. After initial resuscitation, what is the MOST critical next step in management PRIOR to definitive surgical stabilization?

. Immediate external fixation of the pelvis.
. Diagnostic angiography to rule out arterial bleeding.
. Insertion of a bladder catheter and rectal examination.
. CT scan with intravenous contrast.
. Detailed evaluation of sacral morphology and stability.

Correct Answer & Explanation

. Insertion of a bladder catheter and rectal examination.

Explanation

While all options are relevant in the management of pelvic ring injuries, a Young-Burgess Type II APC injury is an unstable pelvic ring injury often associated with significant soft tissue and visceral damage. Rectal examination and insertion of a bladder catheter are critical to assess for open fractures (communication with perineum/rectum), urogenital injuries, and to decompress the bladder. These are often performed immediately following initial resuscitation and ATLS protocol, prior to extensive imaging or definitive fixation, due to the high risk of life-threatening complications like hemorrhage and infection from open injuries. External fixation is important for stability but often follows initial assessment. Angiography is for uncontrolled hemorrhage. CT scan with contrast is for detailed bony and soft tissue assessment but should be done after addressing immediate life threats. Detailed sacral morphology is part of definitive planning.

Question 5687

Topic: 2. Trauma

A 60-year-old male with a history of metastatic prostate cancer presents with sudden onset back pain and bilateral lower extremity weakness. MRI reveals a pathologic fracture of L4 with significant epidural compression of the cauda equina. He has Grade 3/5 motor strength in both legs. What is the MOST urgent surgical intervention indicated?

. Radiation therapy to the L4 vertebral body.
. Percutaneous vertebroplasty.
. Anterior column reconstruction with corpectomy and stabilization.
. Posterior decompression and stabilization.
. Long-segment fusion extending from T10 to S1.

Correct Answer & Explanation

. Posterior decompression and stabilization.

Explanation

The patient presents with an acute pathologic fracture, epidural spinal cord compression (cauda equina in this case), and progressive neurological deficits (Grade 3/5 motor strength). This constitutes an oncologic emergency requiring urgent surgical intervention. The MOST urgent intervention is posterior decompression (laminectomy) to relieve the neural element compression, followed by posterior stabilization to address the instability caused by the fracture and decompression. While anterior column reconstruction with corpectomy and stabilization is a definitive solution for anterior column defects, the immediate priority for acute neurological compromise from epidural compression is often posterior decompression. Radiation therapy is an adjunct but not the primary treatment for acute neurological deficit. Vertebroplasty is for pain relief in stable fractures. Long-segment fusion depends on the extent of disease but the immediate priority is addressing the acute compression.

Question 5688

Topic: 2. Trauma
A 25-year-old male sustains a Gustilo-Anderson Type IIIB open tibia fracture with significant soft tissue loss and exposed bone, after a motorcycle accident. He has no neurovascular compromise and no signs of systemic infection. After initial débridement, irrigation, and temporary external fixation, what is the MOST appropriate next step in surgical management for limb salvage?
. Delayed primary closure of the wound.
. Placement of a split-thickness skin graft.
. Local rotational flap coverage.
. Free tissue transfer (e.g., free fibula or fasciocutaneous flap).
. Amputation due to the severity of the injury.

Correct Answer & Explanation

. Free tissue transfer (e.g., free fibula or fasciocutaneous flap).

Explanation

For a Gustilo-Anderson Type IIIB open tibia fracture, there is extensive soft tissue damage and periosteal stripping, leaving exposed bone. This requires definitive soft tissue coverage to promote healing and prevent infection. Delayed primary closure and split-thickness skin grafts are insufficient for exposed bone or large soft tissue defects. Local rotational flaps may be an option for smaller, less complex defects. However, with 'significant soft tissue loss and exposed bone' in the distal two-thirds of the tibia, free tissue transfer (microvascular free flap, such as a free fibula flap for bone reconstruction or a fasciocutaneous flap for soft tissue coverage) is often the most appropriate and reliable method for definitive coverage and limb salvage. Amputation should be considered as a last resort, but limb salvage is usually attempted first in the absence of severe neurovascular injury or unmanageable infection. The question implies a limb salvage goal.

Question 5689

Topic: 2. Trauma

A 75-year-old female with a history of osteoporosis on long-term bisphosphonate therapy presents with sudden onset of severe right thigh pain after a low-energy fall. Radiographs reveal a transverse fracture of the subtrochanteric region of the right femur with medial cortical thickening ('beaking').

What is the most appropriate definitive surgical management for this fracture?

. Open reduction internal fixation with a dynamic hip screw.
. Nonsurgical management with traction.
. Intramedullary nailing with locked proximal and distal screws.
. Total hip arthroplasty.
. Percutaneous pinning.

Correct Answer & Explanation

. Intramedullary nailing with locked proximal and distal screws.

Explanation

This patient presents with a classic atypical femoral fracture (AFF), characterized by a transverse or short oblique fracture in the subtrochanteric or diaphyseal region, often with medial cortical thickening ('beaking'), occurring in patients on long-term bisphosphonate therapy. The most appropriate definitive surgical management for a displaced AFF is intramedullary nailing. IM nailing provides stable fixation, helps to prevent rotational instability, and addresses the entire length of the femur due to the propensity for stress risers. A dynamic hip screw (DHS) is generally not recommended for subtrochanteric fractures, especially AFFs, due to high failure rates. Nonsurgical management is inappropriate for a displaced fracture. Total hip arthroplasty is not indicated. Percutaneous pinning is inadequate for this fracture pattern.

Question 5690

Topic: Pelvic & Acetabular Trauma

A 45-year-old patient is brought to the emergency department after a high-speed motor vehicle collision. He is hypotensive (BP 80/50 mmHg) and tachycardic (HR 125 bpm). Physical examination reveals a swollen and unstable pelvis. A bedside AP pelvis radiograph is obtained and is shown below.

The radiograph shows a significantly displaced open-book pelvic injury with widening of the pubic symphysis and disruption of the posterior sacroiliac ligaments. After initial ATLS resuscitation, what is the MOST immediate and critical orthopedic intervention to manage ongoing hemorrhage?

. Diagnostic peritoneal lavage.
. Laparotomy for abdominal exploration.
. Application of a pelvic binder or external fixator.
. Emergent angiography and embolization.
. CT scan of the abdomen and pelvis.

Correct Answer & Explanation

. Application of a pelvic binder or external fixator.

Explanation

In a hemodynamically unstable patient with an unstable pelvic ring injury, the MOST immediate and critical orthopedic intervention for hemorrhage control is the application of a pelvic binder or external fixator. This maneuver reduces the volume of the pelvic cavity, tamponading venous bleeding and promoting clot formation. While angiography and embolization are crucial for arterial bleeding, and laparotomy may be needed for intra-abdominal organ injury, pelvic compression provides rapid initial stabilization for the majority of pelvic hemorrhage (which is often venous). A CT scan is usually performed after hemodynamic stabilization.

Question 5691

Topic: Pelvic & Acetabular Trauma

A 40-year-old female presents with a 6-month history of chronic, dull ache in her right buttock, with occasional radiation to the posterior thigh, but not below the knee. The pain is exacerbated by prolonged standing, sitting, or weight-bearing on the affected side. Physical examination reveals tenderness over the right sacroiliac joint and positive distraction, compression, and FABER tests. Lumbar MRI is unremarkable. What is the MOST appropriate next step in confirming the diagnosis and guiding treatment for suspected sacroiliac joint dysfunction?

. Prescription of oral corticosteroids.
. Electromyography (EMG) and nerve conduction studies (NCS) of the lower extremity.
. Diagnostic injection of local anesthetic into the sacroiliac joint.
. Lumbar epidural steroid injection.
. Referral for psychiatric evaluation due to chronic pain.

Correct Answer & Explanation

. Diagnostic injection of local anesthetic into the sacroiliac joint.

Explanation

When lumbar pathology has been ruled out, a diagnostic injection of local anesthetic (with or without corticosteroid) directly into the sacroiliac joint is considered the gold standard for confirming sacroiliac joint dysfunction. Significant (e.g., >50%) transient relief of symptoms immediately following the injection strongly supports the diagnosis. EMG/NCS are useful for radiculopathy but less specific for SI joint pain. Lumbar epidural steroid injection targets lumbar radicular pain. Oral corticosteroids provide systemic relief but are not diagnostic. Psychiatric evaluation is premature without a confirmed diagnosis.

Question 5692

Topic: 2. Trauma
A 35-year-old male sustains a high-energy motor vehicle accident resulting in an open tibia shaft fracture with extensive soft tissue loss and periosteal stripping (Gustilo-Anderson Type IIIB). Initial debridement and external fixation were performed 4 hours post-injury, and broad-spectrum antibiotics were initiated. The wound bed is clean but presents a large soft tissue defect. What is the optimal timing for definitive soft tissue coverage (e.g., free flap or rotational flap) in this Gustilo-Anderson Type IIIB open fracture?
. Within 6 hours of injury (emergent).
. Within 24 hours of injury.
. Within 72 hours of injury.
. Delayed until fracture union is achieved.
. After serial debridements and when the wound is deemed ready for coverage, typically within 5-7 days.

Correct Answer & Explanation

. After serial debridements and when the wound is deemed ready for coverage, typically within 5-7 days.

Explanation

For Gustilo-Anderson Type IIIB open tibia fractures, optimal timing for definitive soft tissue coverage (e.g., with a rotational or free flap) is generally after initial emergent debridements and when the wound bed is clean and healthy. This typically occurs within 5-7 days of injury, but certainly within 7-10 days. The 'golden 6-hour window' applies to initial debridement, and coverage within 72 hours is often targeted for Type IIIA fractures. Type IIIB fractures, due to extensive soft tissue injury, usually require serial debridements and a period for wound assessment and planning for complex flap coverage. Delaying until fracture union is too late and increases the risk of infection and nonunion.

Question 5693

Topic: 2. Trauma

A 22-year-old male presents after a high-speed motor vehicle collision with severe pelvic pain. Physical examination reveals a shortened and externally rotated left lower extremity. There is a perineal laceration with suspicion of an open pelvic fracture. Initial pelvic radiographs are obtained:

The radiographs show widening of the left sacroiliac joint, a left sacral fracture, and disruption of the symphysis pubis. Hemodynamic instability is present, requiring ongoing resuscitation. What is the MOST critical immediate management step for this patient?

. Formal internal fixation of the symphysis pubis and sacroiliac joint.
. Pelvic angiography and embolization for ongoing hemorrhage.
. Immediate placement of an external fixator across the anterior pelvic ring.
. Application of a pelvic binder or sheet wrap and emergent transfer to a trauma center with appropriate resources.
. Diagnostic peritoneal lavage to assess for intra-abdominal organ injury.

Correct Answer & Explanation

. Application of a pelvic binder or sheet wrap and emergent transfer to a trauma center with appropriate resources.

Explanation

The image provided shows a severe pelvic ring injury (likely vertical shear type given widening of SI joint and symphysis disruption) with associated hemodynamic instability and an open fracture. This is a life-threatening injury.The MOST critical immediate management step for an unstable pelvic fracture with hemodynamic instability is to reduce and stabilize the pelvic ring to decrease the pelvic volume, tamponade venous bleeding, and potentially reduce arterial bleeding. This is typically achieved rapidly in the emergency setting with a pelvic binder or sheet wrap. This immediate action aims to control hemorrhage, which is the leading cause of death in these patients.While angiography and embolization may be necessary for ongoing arterial hemorrhage, it is usually performed after initial mechanical stabilization. Immediate internal fixation is a definitive step, not an immediate first step in an unstable patient. Diagnostic peritoneal lavage (DPL) or focused assessment with sonography for trauma (FAST) is important for assessing intra-abdominal injuries but not the primary pelvic stabilization step.Rationale for options:A. Formal internal fixation is definitive treatment, performed after initial resuscitation and temporary stabilization, typically in the operating room, not as an immediate emergency department step.B. Pelvic angiography and embolization are crucial for arterial hemorrhage, but mechanical reduction of the pelvis (e.g., with a binder) should precede or occur concurrently to reduce overall pelvic volume and venous bleeding, which is more common.C. Application of a pelvic binder or sheet wrap is the immediate, life-saving maneuver for an unstable pelvic ring injury with hemodynamic instability. It helps to close the 'open book' and reduce the pelvic volume, thereby tamponading venous hemorrhage. Emergent transfer to a specialized trauma center is also crucial. This is the correct answer.D. DPL is part of the ATLS protocol to assess intra-abdominal injury, but pelvic stabilization takes precedence for control of hemorrhage originating from the pelvis.

Question 5694

Topic: 2. Trauma
A 3-year-old child presents with a high-grade open tibia and fibula fracture (Gustilo-Anderson Type IIIB) sustained in a motor vehicle accident. The fracture is severely comminuted, with extensive soft tissue loss and periosteal stripping. Initial debridement and application of an external fixator have been performed. What is the most critical next step in the definitive management plan to achieve fracture union and prevent infection?
. Early conversion to intramedullary nailing once soft tissues permit.
. Primary closure of the wound with rotational flaps.
. Vascularized free tissue transfer (free flap) for soft tissue coverage.
. Daily dressing changes with wet-to-dry gauze.
. Initiation of oral antibiotics for 6 weeks.

Correct Answer & Explanation

. Vascularized free tissue transfer (free flap) for soft tissue coverage.

Explanation

Gustilo-Anderson Type IIIB open fractures involve extensive soft tissue loss and periosteal stripping. The most critical step to prevent infection and promote healing is early, adequate soft tissue coverage, which typically requires a vascularized free tissue transfer (free flap) when local tissue is insufficient.

Question 5695

Topic: 2. Trauma

A 45-year-old male sustains a high-energy crush injury to his right forearm while operating heavy machinery. He presents with severe pain, swelling, and deformity. Clinical examination reveals open fractures of both the distal radius and ulna, significant soft tissue contamination, and signs of impending compartment syndrome. Distal neurovascular status is intact but diminished. What is the MOST critical immediate management step?

. Immediate closed reduction and splinting, then elevation and observation.
. Emergency open reduction and internal fixation (ORIF) of both fractures.
. Urgent irrigation and debridement, fracture stabilization (external fixator), and fasciotomies.
. CT angiogram to assess for vascular injury.
. Administer broad-spectrum oral antibiotics and arrange for outpatient follow-up.

Correct Answer & Explanation

. Urgent irrigation and debridement, fracture stabilization (external fixator), and fasciotomies.

Explanation

This patient presents with a severe forearm injury: open fractures of the distal radius and ulna, significant soft tissue contamination, and impending compartment syndrome. This is a surgical emergency.The immediate management of such a critical injury follows ATLS principles and focuses on limb salvage:1.Life over limb.2.Debridement and infection control:For open fractures, urgent irrigation and debridement are paramount to minimize infection risk.3.Fracture stabilization:Temporary stabilization, often with an external fixator, is necessary to prevent further soft tissue damage and facilitate subsequent care.4.Soft tissue coverage and compartment syndrome management:Impending compartment syndrome requires emergent fasciotomies to prevent irreversible muscle and nerve damage. This is a limb-saving procedure.Rationale for options:A. Closed reduction and splinting are insufficient for open fractures, gross instability, and impending compartment syndrome.B. Emergency open reduction and internal fixation (ORIF) is the definitive fixation, but not theimmediatemanagement, especially with significant contamination and impending compartment syndrome. The priority is debridement, stabilization, and fasciotomy.C. Urgent irrigation and debridement, fracture stabilization (often with an external fixator as an initial step for temporary stabilization), and fasciotomies (for impending compartment syndrome) are the critical immediate steps in managing this complex, open, high-energy forearm injury. This is the correct answer.D. While vascular injury is a concern with high-energy trauma, emergent fasciotomies are needed for compartment syndrome. A CT angiogram may be performed after limb-threatening conditions are addressed or as part of vascular repair.E. Oral antibiotics are insufficient for open fractures; intravenous broad-spectrum antibiotics are required. Outpatient follow-up is inappropriate for such an acute emergency.

Question 5696

Topic: 2. Trauma
A 3-year-old male presents with a painful, swollen left knee. He has a history of hemophilia A and recently experienced a minor fall. Physical examination reveals a warm, swollen knee with limited range of motion and significant tenderness. Radiographs show signs of soft tissue swelling but no acute fracture. Laboratory tests reveal an elevated activated partial thromboplastin time (aPTT). What is the most critical immediate management step?
. Aspiration of the knee joint to confirm hemarthrosis.
. Administration of factor VIII concentrate.
. Application of a knee immobilizer and ice.
. Initiation of oral pain medication and physical therapy.
. Urgent MRI to rule out osteochondral injury.

Correct Answer & Explanation

. Administration of factor VIII concentrate.

Explanation

In a patient with hemophilia A and suspected hemarthrosis, the most critical immediate step is the administration of the deficient clotting factor (Factor VIII) to achieve hemostasis and prevent further joint damage. Aspiration should only be performed after factor replacement.

Question 5697

Topic: 2. Trauma

A 22-year-old male sustains a closed comminuted tibial shaft fracture. Twelve hours post-admission, he develops severe pain out of proportion to the injury, exacerbated by passive stretch of the hallux. Intracompartmental pressure monitoring is performed. Which of the following pressure measurements is generally considered the threshold for performing an emergency four-compartment fasciotomy?

. Absolute intracompartmental pressure > 20 mmHg
. Absolute intracompartmental pressure > 25 mmHg
. Delta pressure (Diastolic blood pressure minus Compartment pressure) < 30 mmHg
. Delta pressure (Mean arterial pressure minus Compartment pressure) < 40 mmHg
. Delta pressure (Systolic blood pressure minus Compartment pressure) < 30 mmHg

Correct Answer & Explanation

. Delta pressure (Diastolic blood pressure minus Compartment pressure) < 30 mmHg

Explanation

Compartment syndrome is a surgical emergency. The current standard for diagnosing acute compartment syndrome using pressure measurements relies on the 'delta pressure' concept (Diastolic blood pressure minus intracompartmental pressure). A delta pressure of less than 30 mmHg (i.e., the compartment pressure comes within 30 mmHg of the diastolic pressure) indicates inadequate tissue perfusion and is the widely accepted threshold for performing emergency fasciotomies.

Question 5698

Topic: 2. Trauma

When utilizing a lag screw for interfragmentary compression in fracture fixation, which of the following mechanical properties most effectively increases the pull-out strength of the screw in cancellous bone?

. Decreasing the outer (thread) diameter
. Increasing the core (root) diameter
. Increasing the thread pitch
. Increasing the outer diameter to core diameter ratio
. Decreasing the number of threads engaged

Correct Answer & Explanation

. Increasing the outer diameter to core diameter ratio

Explanation

The pull-out strength of a screw is proportional to the volume of bone caught between the threads. In softer, cancellous bone, to maximize grip and pull-out strength, a cancellous screw is designed with a larger outer (thread) diameter and a smaller core (root) diameter. Therefore, increasing the ratio of the outer diameter to the core diameter significantly increases the pull-out strength. Increasing the core diameter alone (as in cortical screws) increases the bending strength but not the pull-out strength in cancellous bone.

Question 5699

Topic: 2. Trauma

A 75-year-old female undergoes retrograde intramedullary nailing for a supracondylar femur fracture (AO/OTA 33-A1).

To avoid an intra-articular deformity, the starting point for the nail must be perfectly collinear with the anatomical axis of the femur. Which of the following describes the correct starting point for a retrograde femoral nail?

. In the intercondylar notch, perfectly centered between the medial and lateral femoral condyles in the coronal plane
. In the intercondylar notch, slightly medial to the center of the notch, just anterior to Blumensaat's line
. In the intercondylar notch, slightly lateral to the center of the notch, aligned with the medullary canal
. Directly on the apex of the medial femoral condyle
. Directly anterior to the trochlear groove

Correct Answer & Explanation

. In the intercondylar notch, perfectly centered between the medial and lateral femoral condyles in the coronal plane

Explanation

For retrograde intramedullary nailing of the femur, the correct starting point is critical to prevent coronal and sagittal plane deformities. The ideal entry portal is in the center of the intercondylar notch (centered between the medial and lateral condyles) in the coronal plane, and at the junction of the anterior third and posterior two-thirds of Blumensaat's line in the sagittal plane. This aligns perfectly with the anatomical axis of the femoral diaphysis.

Question 5700

Topic: Pelvic & Acetabular Trauma
Which of the following anatomical landmarks is the correct target for the optimal placement of a circumferential pelvic sheet or binder to reduce an open book pelvic ring injury in the trauma bay?
. Iliac crests
. Greater trochanters
. Anterior superior iliac spines
. Pubic symphysis

Correct Answer & Explanation

. Greater trochanters

Explanation

To effectively reduce an open book pelvic injury, the pelvic binder must be placed at the level of the greater trochanters. Placing it higher, over the iliac crests or ASIS, is ineffective and can potentially worsen the injury.

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