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2. Trauma MCQs

Practice Set 100 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 1981

Topic: 2. Trauma

During the surgical exposure of a Vancouver B1 periprosthetic femoral fracture, the surgeon performs an extensile direct lateral approach. After incising the fascia lata, the vastus lateralis is identified. To preserve the primary periosteal blood supply to the femur and minimize devascularization of fracture fragments, which of the following surgical maneuvers is most appropriate?

. Aggressively strip the vastus lateralis anteriorly and posteriorly off the femur.
. Split the vastus lateralis muscle belly longitudinally in its center.
. Elevate the vastus lateralis anteriorly off the lateral intermuscular septum, carefully ligating perforating vessels.
. Perform a complete circumferential periosteal stripping around the fracture site.
. Utilize an anterior approach to avoid the vastus lateralis entirely.

Correct Answer & Explanation

. Elevate the vastus lateralis anteriorly off the lateral intermuscular septum, carefully ligating perforating vessels.

Explanation

Correct Answer: Elevate the vastus lateralis anteriorly off the lateral intermuscular septum, carefully ligating perforating vessels.The case emphasizes that the healing of a periprosthetic fracture is almost exclusively dependent on the periosteal blood supply, primarily from the perforating branches of the profunda femoris artery. Surgical approaches must strictly respect these posterior structures. The text states: 'The vastus lateralis is elevated anteriorly off the lateral intermuscular septum. Perforating vessels from the profunda femoris will be encountered piercing the septum; these must be carefully identified, ligated, or cauterized to prevent postoperative hematoma, while strictly avoiding dissection posterior to the septum to preserve the primary periosteal blood supply.'Aggressively strip the vastus lateralis anteriorly and posteriorly off the femur:This would lead to significant devascularization of the periosteum, directly contradicting the principle of preserving blood supply.Split the vastus lateralis muscle belly longitudinally in its center:While a vastus-splitting approach can be used, the text specifically states that splitting the muscle belly 'can denervate the anterior portion and cause significant bleeding,' and a subvastus or vastus-splitting approach at theposterior borderis preferred, implying elevation rather than central splitting.Perform a complete circumferential periosteal stripping around the fracture site:This is a highly detrimental maneuver that would severely compromise the periosteal blood supply, drastically increasing the risk of nonunion.Utilize an anterior approach to avoid the vastus lateralis entirely:An extensile direct lateral approach is described as the standard for these fractures, not an anterior approach.

Question 1982

Topic: 2. Trauma

During the surgical procedure for the Vancouver B1 periprosthetic femoral fracture, after exposing the fracture site, the surgeon performs a critical intraoperative assessment. What is this assessment, and what is its immediate implication if a positive finding is observed?

. Fluoroscopic assessment of fracture reduction; proceed with plate application if satisfactory.
. Manual 'push-pull' test of the prosthesis; if motion is detected, the diagnosis changes to Vancouver B2, requiring stem revision.
. Measurement of cortical thickness; if less than 4mm, augment with bone graft.
. Assessment of periosteal integrity; if compromised, apply rhBMP-2.
. Evaluation of fracture comminution; if severe, use a longer plate.

Correct Answer & Explanation

. Manual 'push-pull' test of the prosthesis; if motion is detected, the diagnosis changes to Vancouver B2, requiring stem revision.

Explanation

Correct Answer: Manual 'push-pull' test of the prosthesis; if motion is detected, the diagnosis changes to Vancouver B2, requiring stem revision.The case explicitly states: 'Once the fracture site is exposed, the most critical step of the operation occurs: the intraoperative assessment of stem stability. The surgeon must perform a manual "push-pull" test. By placing an instrument on the collar or trunnion of the prosthesis (if exposed) or by manipulating the proximal fragment, the surgeon assesses for any gross or micromotion between the stem, the cement mantle, and the proximal bone. If any motion is detected, the diagnosis changes immediately to a Vancouver B2 fracture, and the surgical plan must pivot to stem extraction and revision using a long diaphyseal-engaging stem.'Fluoroscopic assessment of fracture reduction; proceed with plate application if satisfactory:Fluoroscopy is used for reduction and hardware placement, but it's not themost criticalinitial intraoperative assessment forchanging the diagnosis and surgical planfrom B1 to B2.Measurement of cortical thickness; if less than 4mm, augment with bone graft:Cortical thickness is important for screw purchase and may influence augmentation, but it's not the primary test for stem stability.Assessment of periosteal integrity; if compromised, apply rhBMP-2:Periosteal integrity is important for healing, but there's no mention of a specific intraoperative test for it that would immediately change the fracture classification or primary surgical approach.Evaluation of fracture comminution; if severe, use a longer plate:Fracture comminution influences plate length and construct design, but it does not change the fundamental classification of B1 vs. B2.

Question 1983

Topic: 2. Trauma

For the Vancouver B1 periprosthetic femoral fracture, a broad, heavy-duty locking compression plate (LCP) is selected. In the proximal segment, where the intramedullary canal is occupied by the existing stem and cement, which of the following fixation strategies is most appropriate to secure the plate to the bone?

. Standard bicortical locking screws through the plate and stem.
. Unicortical non-locking screws with washers.
. Cerclage cables or wires passed circumferentially around the bone and plate, or specialized unicortical locking screws.
. Intramedullary nailing over the existing stem.
. External fixation with pins placed proximal to the stem.

Correct Answer & Explanation

. Cerclage cables or wires passed circumferentially around the bone and plate, or specialized unicortical locking screws.

Explanation

Correct Answer: Cerclage cables or wires passed circumferentially around the bone and plate, or specialized unicortical locking screws.The case clearly outlines the fixation strategy for the proximal segment of a Vancouver B1 fracture: 'In the region of the indwelling stem, bicortical screw purchase is impossible without damaging the implant or the cement mantle, which could precipitate late loosening. Fixation here relies on cerclage cables or wires passed circumferentially around the bone and plate. Specialized cable-ready plates or cable buttons are utilized. Care must be taken using cable passers to stay strictly on the bone to avoid neurovascular injury medially. Alternatively, specialized unicortical locking screws with blunt tips can be used to engage the lateral cortex without penetrating the cement mantle.'Standard bicortical locking screws through the plate and stem:This is explicitly stated as impossible and damaging to the implant/cement mantle.Unicortical non-locking screws with washers:While unicortical screws are mentioned, they are described aslockingscrews with blunt tips, not non-locking screws with washers, which would provide less stable fixation.Intramedullary nailing over the existing stem:This is not feasible with an existing intramedullary stem and cement mantle.External fixation with pins placed proximal to the stem:External fixation is generally reserved for open fractures, highly contaminated wounds, or as a temporary measure, not as definitive fixation for a closed periprosthetic fracture around a stable stem.

Question 1984

Topic: 2. Trauma

To optimize the fixation construct for the Vancouver B1 periprosthetic femoral fracture, the surgeon must ensure the locking plate extends sufficiently. What is the recommended minimum overlap of the plate with the proximal stem to prevent creating a new stress riser at the end of the plate?

. At least one femoral cortical diameter
. At least two femoral cortical diameters
. At least three femoral cortical diameters
. At least four femoral cortical diameters
. The plate should end exactly at the stem tip

Correct Answer & Explanation

. At least two femoral cortical diameters

Explanation

Correct Answer: At least two femoral cortical diametersThe case specifies the principle of construct optimization: 'To prevent a stress riser at the proximal end of the plate, the plate must overlap the proximal stem by at least two femoral diameters.' This ensures a gradual transition of stress from the plate to the bone, minimizing the risk of fracture at the plate's end.At least one femoral cortical diameter:This is generally considered insufficient to prevent a stress riser.At least three femoral cortical diameters:While more overlap might be beneficial, two diameters is the stated minimum.At least four femoral cortical diameters:This is excessive and not the specified minimum.The plate should end exactly at the stem tip:This would create a significant stress riser at the plate's end, directly adjacent to the stem, increasing the risk of refracture.

Question 1985

Topic: 2. Trauma

Six months after surgical fixation of a Vancouver B1 periprosthetic femoral fracture, a patient presents with progressive pain and radiographic evidence of hardware failure and lack of callus formation. The stem remains well-fixed. What is the most appropriate salvage strategy for this aseptic nonunion?

. Non-operative management with prolonged immobilization and pain control.
. Immediate revision total hip arthroplasty with stem exchange.
. Revision ORIF with decortication, autologous bone grafting, and potentially dual-plate constructs.
. Application of an external fixator for improved stability.
. Aggressive surgical debridement and implant retention (DAIR).

Correct Answer & Explanation

. Revision ORIF with decortication, autologous bone grafting, and potentially dual-plate constructs.

Explanation

Correct Answer: Revision ORIF with decortication, autologous bone grafting, and potentially dual-plate constructs.The case discusses the management of aseptic nonunion: 'If a patient presents with progressive pain and radiographic evidence of hardware failure or lack of callus formation at six months, intervention is required. If the stem remains well-fixed, revision plating with decortication, autologous bone grafting (e.g., from the iliac crest or using the Reamer-Irrigator-Aspirator system), and potentially dual-plate constructs are indicated.' This approach addresses the biological (nonunion) and mechanical (hardware failure) issues while preserving the stable stem.Non-operative management with prolonged immobilization and pain control:Non-operative management is generally reserved for very specific, non-ambulatory, or moribund patients and is associated with high complication rates. It is not appropriate for a patient with a failed surgical fixation and a stable stem.Immediate revision total hip arthroplasty with stem exchange:This would be indicated if the stem were loose (Vancouver B2 or B3), but the vignette explicitly states the stem remains well-fixed. Unnecessary stem revision adds significant morbidity.Application of an external fixator for improved stability:External fixation is typically not the definitive treatment for aseptic nonunion of a periprosthetic femoral fracture in this scenario. It's more common for open fractures or temporary stabilization.Aggressive surgical debridement and implant retention (DAIR):DAIR is a strategy for acute periprosthetic joint infection, not aseptic nonunion. The question specifies 'aseptic nonunion.'

Question 1986

Topic: 2. Trauma

A 72-year-old female presents to the emergency department after a low-energy fall at home. She has a history of osteoporosis and has been on alendronate for 8 years. Radiographs reveal a transverse fracture of the proximal femur, approximately 3 cm distal to the lesser trochanter, with lateral cortical thickening and minimal comminution. The contralateral femur shows similar, though less pronounced, cortical changes. Given her history and radiographic findings, which of the following is the most appropriate initial management strategy for the *affected* femur?

. A. Non-operative management with bed rest and pain control due to low-energy mechanism.
. B. Open reduction and internal fixation with a locking compression plate (LCP) to address the transverse pattern.
. C. Intramedullary nailing (IMN) of the affected femur with consideration for prophylactic nailing of the contralateral femur.
. D. Skeletal traction followed by delayed IMN once medical comorbidities are fully optimized.
. E. Immediate total hip arthroplasty due to the high risk of nonunion in osteoporotic bone.

Correct Answer & Explanation

. C. Intramedullary nailing (IMN) of the affected femur with consideration for prophylactic nailing of the contralateral femur.

Explanation

Correct Answer: CExplanation:The patient's presentation is highly suggestive of an Atypical Femoral Fracture (AFF). Key features include: elderly female, prolonged bisphosphonate use (8 years of alendronate), low-energy trauma, transverse fracture pattern in the subtrochanteric region, lateral cortical thickening (a 'beaking' or 'flaring' sign), and minimal comminution. The mention of similar changes in the contralateral femur further supports the diagnosis, as AFFs are often bilateral.Why C is correct:The case explicitly states that Atypical Femoral Fractures (AFFs) are inherently unstable and have a high risk of complete fracture if not surgically stabilized. Prophylactic nailing of the contralateral femur is often considered if radiographic signs of an impending AFF are present due to the high rate of bilaterality. Intramedullary nailing (IMN) is the gold standard for stabilizing these fractures, providing load-sharing and robust fixation.Why A is incorrect:Non-operative management for AFFs is contraindicated due to their inherent instability and high risk of progression to complete fracture and nonunion.Why B is incorrect:While plate fixation can be used for certain subtrochanteric fractures, IMN is generally preferred for AFFs. The case states that IMN is the gold standard for most subtrochanteric fractures, and specifically mentions prophylactic nailing for incomplete AFFs. Plate fixation is typically reserved for specific situations where IMN is difficult or contraindicated, which is not the primary indication for a typical AFF.Why D is incorrect:While medical optimization is important, delayed fixation with prolonged skeletal traction is generally avoided for femur fractures due to the associated risks of prolonged recumbency and systemic complications, especially in elderly patients. Early stabilization is preferred.Why E is incorrect:Total hip arthroplasty is not indicated for an acute subtrochanteric femur fracture, even in osteoporotic bone. It is a reconstructive procedure for hip joint pathology (e.g., severe arthritis, femoral head AVN/fracture) and would not address the diaphyseal fracture.

Question 1987

Topic: 2. Trauma

A 35-year-old male sustains a high-energy subtrochanteric femur fracture after a motor vehicle collision. On initial clinical examination and radiographic assessment, the orthopedic surgeon notes significant displacement of the fracture fragments. Which of the following describes the characteristic deforming forces acting on the *proximal* fragment in a typical subtrochanteric femur fracture?

. A. Adduction, internal rotation, and extension.
. B. Abduction, external rotation, and extension.
. C. Flexion, abduction, and external rotation.
. D. Flexion, adduction, and internal rotation.
. E. Neutral position with minimal displacement due to balanced muscle forces.

Correct Answer & Explanation

. C. Flexion, abduction, and external rotation.

Explanation

Correct Answer: CExplanation:The teaching case explicitly details the powerful muscular attachments and their deforming forces on subtrochanteric fracture fragments. Understanding these forces is critical for achieving successful reduction.Why C is correct:The case states: "The net effect of these opposing forces is often a characteristic deformity: flexion, abduction, and external rotation of the proximal fragment, with adduction and shortening of the distal fragment." Specifically, the iliopsoas muscle inserts onto the lesser trochanter, causing flexion of the proximal fragment. The gluteus medius and minimus insert onto the greater trochanter, inducing abduction. The external rotators (piriformis, obturators, gemelli, quadratus femoris) also contribute to external rotation of the proximal segment.Why A, B, D, and E are incorrect:These options do not accurately reflect the combined deforming forces described in the case for the proximal fragment. Extension is not a primary deforming force on the proximal fragment; rather, flexion is. Adduction and internal rotation are typically forces acting on the distal fragment, not the proximal. The forces are rarely balanced, leading to significant displacement.

Question 1988

Topic: 2. Trauma

A 58-year-old male presents with a comminuted subtrochanteric femur fracture (AO/OTA 32-A3) after a fall from a ladder. During pre-operative planning, a CT scan reveals significant medial cortical comminution. The surgeon plans for intramedullary nailing. Based on the biomechanical principles outlined in the case, what is the most critical consideration regarding this medial comminution?

. A. It primarily affects the vascular supply to the fracture site, increasing the risk of nonunion.
. B. It necessitates the use of a shorter intramedullary nail to avoid distal stress risers.
. C. It significantly increases the load on the implant, requiring restoration of medial cortical contact for load sharing.
. D. It mandates an open reduction and internal fixation with a locking plate due to inherent instability.
. E. It indicates a higher likelihood of nerve injury during surgical approach due to fragment displacement.

Correct Answer & Explanation

. C. It significantly increases the load on the implant, requiring restoration of medial cortical contact for load sharing.

Explanation

Correct Answer: CExplanation:The teaching case emphasizes the biomechanical challenges posed by subtrochanteric fractures, particularly the impact of comminution.Why C is correct:The case states under 'Impact of Comminution': "Loss of medial cortical support significantly increases the load on the implant, contributing to implant fatigue and failure if not adequately supported biomechanically. The restoration of medial cortical contact, either directly or indirectly, is critical for load sharing and long-term implant survival." This highlights the crucial role of the medial cortex in sharing compressive loads and protecting the implant from excessive bending stresses.Why A is incorrect:While extensive soft tissue stripping during open reduction can compromise periosteal circulation, medial comminution itself does not primarily affect the overall vascular supply to the fracture site in a way that is distinct from other comminuted fractures. The primary concern with medial comminution is biomechanical load sharing.Why B is incorrect:The presence of comminution, especially in the subtrochanteric region, generally favors the use of alongintramedullary nail to span the entire femoral shaft and protect against distal stress risers or iatrogenic fractures, not a shorter nail.Why D is incorrect:While significant comminution can be challenging, IMN remains the gold standard for most subtrochanteric fractures, even comminuted ones. Adjunctive techniques like blocking screws can help achieve reduction and stability. Plate fixation is reserved for specific indications, not simply comminution.Why E is incorrect:Medial comminution itself does not inherently increase the likelihood of nerve injury during a lateral surgical approach. Nerve injury is a rare complication related to direct trauma during the approach or screw insertion, not specifically due to medial comminution.

Question 1989

Topic: 2. Trauma

A 48-year-old male presents with a subtrochanteric femur fracture after a fall from a height. Pre-operative radiographs are obtained, including the image below. The surgical team is planning for intramedullary nailing. Which of the following pre-operative planning steps is most crucial for determining the appropriate nail length and diameter?

. A. Reviewing the patient's medical history for anticoagulant use.
. B. Obtaining a CT scan with 3D reconstructions to assess comminution.
. C. Templating with contralateral hip films to estimate nail length and diameter.
. D. Performing a comprehensive neurological examination of the affected limb.
. E. Consulting with anesthesia for pre-operative pain management strategies.

Correct Answer & Explanation

. C. Templating with contralateral hip films to estimate nail length and diameter.

Explanation

Correct Answer: CExplanation:The question asks about the most crucial pre-operative planning step for determining nail length and diameter, specifically in the context of the provided image showing a subtrochanteric fracture.Why C is correct:The case explicitly states under 'Implant Selection and Templating': "Templating with contralateral hip films helps estimate nail length and diameter. The nail should ideally extend to within 1-2 cm of the epiphyseal plate of the distal femur." This is a direct and essential step for accurate implant sizing.Why A is incorrect:Reviewing anticoagulant use is crucial for surgical safety (bleeding risk) but does not directly determine nail length or diameter.Why B is incorrect:Obtaining a CT scan with 3D reconstructions is highly recommended for comminuted fractures to delineate fracture patterns and identify issues with nail entry or length. While it helps understand the fracture, templating with contralateral films is the primary method forestimatingthe overall nail length and diameter needed for the entire femur.Why D is incorrect:A comprehensive neurological examination is part of the overall patient assessment to rule out concomitant injuries but does not directly influence nail sizing.Why E is incorrect:Consulting anesthesia for pain management is vital for patient comfort and early mobilization but is not a step for determining implant dimensions.

Question 1990

Topic: 2. Trauma

During the surgical fixation of a subtrochanteric femur fracture, the surgeon encounters difficulty achieving and maintaining reduction of the proximal fragment, which remains significantly flexed and abducted despite longitudinal traction. Which of the following intra-operative maneuvers or adjunctive techniques is most appropriate to address this specific reduction challenge?

. A. Applying a temporary external fixator to the distal fragment only.
. B. Increasing the reaming diameter to allow for easier nail passage.
. C. Placing a large Schanz pin in the proximal fragment to use as a joystick and/or placing a bolster under the buttock.
. D. Utilizing cerclage wires around the fracture site to compress the fragments.
. E. Performing a distal femoral osteotomy to correct the angulation.

Correct Answer & Explanation

. C. Placing a large Schanz pin in the proximal fragment to use as a joystick and/or placing a bolster under the buttock.

Explanation

Correct Answer: CExplanation:The question describes a common and challenging scenario in subtrochanteric fracture fixation: difficulty reducing the proximal fragment's characteristic flexion and abduction deformity.Why C is correct:The case specifically addresses this under 'Reduction - Addressing Proximal Fragment Deformity': "Flexion: The proximal fragment is often flexed by the iliopsoas. This can be counteracted by increasing hip flexion (if on a radiolucent table), placing a bolster under the buttock, or using a femoral distractor. Abduction/External Rotation: Reduced by adducting and internally rotating the entire limb. A large Schanz pin placed in the proximal fragment and used as a joystick can also aid in reduction." Using a Schanz pin as a joystick provides direct control over the proximal fragment, and a bolster can help counteract iliopsoas flexion.Why A is incorrect:While an external fixator can provide powerful reduction capabilities, applying it only to the distal fragment would not directly address the flexion and abduction of the proximal fragment. A fixator spanning the fracture would be more effective, but a Schanz pin is a more direct and less invasive method for joystick control of the proximal fragment.Why B is incorrect:Increasing reaming diameter facilitates nail passage but does not directly aid in reducing a significantly flexed and abducted proximal fragment. It's a stepafterreduction.Why D is incorrect:Cerclage wires are used for highly comminuted patterns to achieve reduction, but they require open exposure and can compromise periosteal blood supply. They are not the primary or most appropriate technique for correcting the specific flexion/abduction deformity of the proximal fragment, which is better managed with direct manipulation or joystick techniques.Why E is incorrect:A distal femoral osteotomy is a complex procedure for correcting malunion or deformity in the distal femur and is not an appropriate intra-operative maneuver for reducing an acute subtrochanteric fracture.

Question 1991

Topic: 2. Trauma

A 65-year-old male undergoes intramedullary nailing for a subtrochanteric femur fracture. Post-operatively, he experiences persistent pain at the greater trochanteric entry site, which is exacerbated by hip abduction and external rotation. Radiographs confirm appropriate nail placement and fracture healing. What is the most likely cause of his persistent pain?

. A. Avascular necrosis (AVN) of the femoral head due to piriformis fossa entry.
. B. Distal locking screw irritation of the vastus lateralis.
. C. Nonunion of the subtrochanteric fracture.
. D. Nail prominence irritating the gluteus medius/trochanteric bursa.
. E. Deep vein thrombosis (DVT) in the ipsilateral limb.

Correct Answer & Explanation

. D. Nail prominence irritating the gluteus medius/trochanteric bursa.

Explanation

Correct Answer: DExplanation:The question describes a patient with persistent pain at the greater trochanteric entry site after IMN for a subtrochanteric fracture, with confirmed fracture healing and appropriate nail placement.Why D is correct:The case lists 'Pain at Greater Trochanteric Entry Site' as a common complication (10-20% incidence) and attributes it to "Nail prominence, irritation of the gluteus medius/trochanteric bursa." This perfectly matches the patient's symptoms and the location of pain.Why A is incorrect:While piriformis fossa entry (historically) could lead to AVN, modern trochanteric entry nails are designed to avoid this. Furthermore, AVN of the femoral head would typically present with groin pain and radiographic changes in the femoral head, not specifically trochanteric pain, and the question states appropriate nail placement.Why B is incorrect:Distal locking screw irritation would cause pain in the distal thigh, not at the greater trochanter.Why C is incorrect:The question states that radiographs confirm "fracture healing," ruling out nonunion as the cause of the current pain.Why E is incorrect:DVT would typically present with leg swelling, pain (often calf), warmth, and tenderness, not localized pain at the greater trochanteric entry site.

Question 1992

Topic: 2. Trauma

A 55-year-old female presents with a subtrochanteric femur fracture (AO/OTA 32-A3.3, reverse obliquity pattern). She has a wide medullary canal, and pre-operative templating suggests that even the largest available intramedullary nail would not provide adequate canal fill. The surgeon is concerned about the stability of IMN in this specific fracture pattern. Based on the case, which of the following fixation methods would be a more appropriate alternative in this scenario?

. A. External fixation as a definitive treatment.
. B. Dynamic hip screw (DHS) with an anti-rotation screw.
. C. Plate osteosynthesis with a long, broad locking compression plate (LCP).
. D. Non-operative management with prolonged bed rest and traction.
. E. Exchange nailing with a custom-made larger diameter nail.

Correct Answer & Explanation

. C. Plate osteosynthesis with a long, broad locking compression plate (LCP).

Explanation

Correct Answer: CExplanation:The question describes a specific scenario where IMN might be suboptimal: a reverse obliquity fracture with a wide medullary canal, leading to concerns about adequate canal fill and stability with IMN.Why C is correct:The case discusses the 'Role of Plate Osteosynthesis' and states: "Plate fixation (e.g., LCP, LISS) is reserved for specific situations where IMN is difficult or contraindicated. These include: ...Extremely wide medullary canals where an IMN would not provide adequate fill. ...Certain reverse obliquity patterns (AO/OTA 32-A3.3) where IMN may allow medial displacement of the distal fragment, although controversy exists, and blocking screws with IMN can address this." This scenario combines both a wide canal and a reverse obliquity pattern, making plate osteosynthesis a more appropriate alternative.Why A is incorrect:External fixation is generally used for temporary stabilization, especially in polytrauma, or for complex open fractures, but rarely as definitive treatment for a closed subtrochanteric fracture due to high complication rates and functional limitations.Why B is incorrect:Dynamic hip screws (DHS) are primarily used for intertrochanteric fractures and are generally not recommended for subtrochanteric fractures due to high rates of failure and cutout, as they are not designed to withstand the high bending and torsional forces in this region.Why D is incorrect:Non-operative management is almost universally contraindicated for displaced subtrochanteric fractures due to the high risk of nonunion, malunion, and systemic complications.Why E is incorrect:While exchange nailing with a larger diameter nail is a strategy for nonunion, it's not a primary fixation method for an acute fracture with aninitiallywide canal where even standard large nails are insufficient. Custom-made nails are not a routine primary option.

Question 1993

Topic: 2. Trauma

A 28-year-old male sustains a comminuted subtrochanteric femur fracture. During intramedullary nailing, the surgeon notes that the nail consistently tends to drift into varus, despite careful reaming and initial reduction attempts. To optimize reduction and prevent malalignment, the surgeon decides to use an adjunctive technique. Which of the following techniques, as described in the case, would be most effective in guiding the nail into the desired anatomical reduction and preventing varus angulation?

. A. Applying a temporary external fixator across the hip joint.
. B. Using cerclage wires to compress the comminuted fragments.
. C. Placing blocking screws (Poller screws) in the metaphysis adjacent to the nail path.
. D. Performing a limited open reduction with large reduction clamps.
. E. Reaming the medullary canal to a larger diameter than initially planned.

Correct Answer & Explanation

. C. Placing blocking screws (Poller screws) in the metaphysis adjacent to the nail path.

Explanation

Correct Answer: CExplanation:The question describes a specific intra-operative challenge: the nail drifting into varus despite initial reduction efforts, and asks for the most effective adjunctive technique to guide the nail and prevent malalignment.Why C is correct:The case specifically discusses 'Blocking Screws (Poller Screws)' under 'Adjunctive Techniques': "These are strategically placed screws (typically unicortical) that block the nail path, guiding it into the desired anatomical reduction. They are particularly useful for correcting varus-valgus and anterior-posterior angulation, especially in fractures with significant comminution or those tending towards malalignment. Evidence supports their use in optimizing reduction and preventing malunion." This directly addresses the problem of varus drift.Why A is incorrect:While an external fixator can aid in reduction, it's a more extensive intervention and not the most direct or specific method forguiding the nailand preventing varus drift during IMN insertion.Why B is incorrect:Cerclage wires are used for achieving reduction in highly comminuted patterns, but they require open exposure and can compromise periosteal blood supply. They are not primarily used toguide the nailor prevent specific angulation during nail insertion in the same way blocking screws are.Why D is incorrect:Limited open reduction with clamps is a direct reduction technique if closed methods fail, but it's not an adjunctive technique forguiding the nailonce it's being inserted. Blocking screws work in conjunction with the nail.Why E is incorrect:Reaming to a larger diameter might provide more space for the nail, but it does not inherentlyguidethe nail or prevent it from drifting into varus. In fact, excessive reaming without proper guidance could worsen malalignment.

Question 1994

Topic: 2. Trauma

A 70-year-old male undergoes intramedullary nailing for a subtrochanteric femur fracture. Post-operatively, the surgeon prescribes a rehabilitation protocol. Given the patient's age and the nature of the injury, which of the following weight-bearing strategies is generally recommended for a stable IMN construct in the immediate post-operative period (Day 0-7)?

. A. Full weight-bearing (FWB) as tolerated to promote early callus formation.
. B. Non-weight-bearing (NWB) for at least 6 weeks to protect the fracture site.
. C. Protected weight-bearing (PWB) or touch-down weight-bearing (TDWB) to stimulate healing without overloading the implant.
. D. Continuous passive motion (CPM) for the hip joint with no weight-bearing.
. E. Progressive weight-bearing starting with 50% body weight on day 1.

Correct Answer & Explanation

. C. Protected weight-bearing (PWB) or touch-down weight-bearing (TDWB) to stimulate healing without overloading the implant.

Explanation

Correct Answer: CExplanation:The question asks about the recommended immediate post-operative weight-bearing status for a stable IMN construct of a subtrochanteric femur fracture.Why C is correct:The case states under 'Immediate Post-Operative Period (Day 0-7) - Weight-Bearing (WB) Status': "Protected Weight-Bearing (PWB) or Touch-Down Weight-Bearing (TDWB): For most stable IMN constructs, early protected weight-bearing is initiated. This typically involves 10-25% body weight, emphasizing touch-down to maintain proprioception and stimulate healing without overloading the implant." This aligns perfectly with the recommended protocol.Why A is incorrect:Full weight-bearing immediately post-op, even with a stable IMN, is generally too aggressive and risks implant failure or loss of reduction, especially in an elderly patient with potentially compromised bone quality.Why B is incorrect:Non-weight-bearing for 6 weeks is overly cautious for most stable IMN constructs and can lead to complications of prolonged immobility, such as muscle atrophy, joint stiffness, and DVT. It is reserved for highly unstable fixation or severe osteoporosis.Why D is incorrect:Continuous passive motion (CPM) is primarily used for knee rehabilitation and is not universally indicated for hip fractures. More importantly, it doesn't address the weight-bearing status.Why E is incorrect:Progressive weight-bearing starting with 50% body weight on day 1 is generally too aggressive for immediate post-operative management of a subtrochanteric fracture, even with a stable IMN. The initial phase is typically 10-25% body weight.

Question 1995

Topic: 2. Trauma

A 40-year-old male presents with a subtrochanteric femur fracture (AO/OTA 32-A1) after a motorcycle accident. He is otherwise healthy. The surgeon plans for intramedullary nailing. During the procedure, the image below is obtained. Based on the current literature and guidelines, which of the following statements regarding the choice of intramedullary nail is most accurate for this fracture?

. A. A short intramedullary nail is preferred to minimize surgical invasiveness and preserve distal blood supply.
. B. A piriformis fossa entry nail is superior to a trochanteric entry nail for better alignment with the femoral canal.
. C. Reamed intramedullary nailing is generally preferred to allow for a larger diameter nail and improved cortical contact.
. D. Unreamed intramedullary nailing is recommended to reduce the risk of fat embolization and preserve periosteal blood flow.
. E. Plate osteosynthesis is biomechanically superior to intramedullary nailing for this fracture type.

Correct Answer & Explanation

. C. Reamed intramedullary nailing is generally preferred to allow for a larger diameter nail and improved cortical contact.

Explanation

Correct Answer: CExplanation:The question asks about the most accurate statement regarding the choice of intramedullary nail for a subtrochanteric femur fracture, referencing the provided image of an IMN.Why C is correct:The case states under 'Summary of Key Literature / Guidelines - Reamed vs. Unreamed Nailing': "Reamed intramedullary nailing typically allows for insertion of a larger diameter nail, improving bone-implant contact and construct stability, with good union rates. While concerns about fat embolization exist, modern reaming techniques have minimized this risk." This makes reamed nailing the generally preferred method.Why A is incorrect:The case states under 'Long vs. Short Nails': "For subtrochanteric fractures, particularly those with comminution or extension into the diaphysis, long intramedullary nails extending to the distal femoral metaphysis are generally recommended. This approach reduces the risk of distal femoral shaft fractures above the tip of a short nail, providing a more robust construct and protecting the entire diaphyseal segment." Therefore, a long nail is generally preferred.Why B is incorrect:The case states under 'Trochanteric Entry Nails': "Modern trochanteric entry nails are generally preferred over piriformis entry nails. Studies have shown that trochanteric entry is associated with a lower risk of iatrogenic avascular necrosis of the femoral head and easier insertion due to better alignment with the femoral canal, without compromising stability."Why D is incorrect:While unreamed nailing has theoretical advantages regarding fat embolization and periosteal blood flow, the case indicates that reamed nailing is generally preferred due to superior stability from larger diameter nails and improved cortical contact, with minimized risks from modern reaming techniques.Why E is incorrect:The case clearly states under 'Intramedullary Nailing as the Gold Standard': "Extensive literature consistently supports antegrade intramedullary nailing (IMN) as the gold standard for nearly all subtrochanteric femur fractures. This is primarily due to its load-sharing characteristics, high biomechanical stability, and minimally invasive nature compared to plate osteosynthesis."

Question 1996

Topic: 2. Trauma

A 68-year-old female with a history of chronic kidney disease and poorly controlled diabetes sustains a subtrochanteric femur fracture. She is medically unstable with severe sepsis and decompensated cardiac failure. The orthopedic team is considering surgical intervention. Based on the case, which of the following is an absolute contraindication to immediate operative management?

. A. The presence of a comminuted fracture pattern.
. B. A history of prolonged bisphosphonate use.
. C. The patient's medically unstable status with severe, uncorrectable comorbidities.
. D. The need for a long intramedullary nail.
. E. The patient's advanced age.

Correct Answer & Explanation

. C. The patient's medically unstable status with severe, uncorrectable comorbidities.

Explanation

Correct Answer: CExplanation:The question asks for an absolute contraindication to immediate operative management, given a patient with a subtrochanteric fracture and severe medical comorbidities.Why C is correct:The case explicitly lists under 'Contraindications for Operative Management': "Absolute contraindications to surgical intervention are rare and generally relate to the patient's overall physiological status rather than the fracture pattern itself. Medically unstable patient: A patient with severe, uncorrectable medical comorbidities (e.g., severe sepsis, decompensated cardiac failure) where the risks of anesthesia and surgery outweigh the benefits of fracture fixation. Such cases require medical stabilization, potentially followed by delayed surgery, or palliation." This perfectly matches the patient's described condition.Why A is incorrect:A comminuted fracture pattern is an indication for operative management, not a contraindication, due to its inherent instability.Why B is incorrect:A history of prolonged bisphosphonate use is a risk factor for atypical femoral fractures (AFFs), which are a strong indication for surgical fixation, not a contraindication.Why D is incorrect:The need for a long intramedullary nail is a surgical planning detail, not a contraindication to surgery itself.Why E is incorrect:Advanced age is not an absolute contraindication to surgery. While it often correlates with comorbidities, the decision for surgery is based on physiological status and fracture stability, not age alone. Many elderly patients undergo successful subtrochanteric fracture fixation.

Question 1997

Topic: 2. Trauma
A 42-year-old male construction worker presents to the trauma center with a high-energy pilon fracture after a 15-foot fall. His medical history includes daily tobacco use (1 pack/day x 20 years), poorly controlled Type 2 Diabetes Mellitus (HbA1c 8.4%), and a BMI of 32. Given these comorbidities, which of the following is the most significant immediate concern for the orthopedic surgeon regarding the timing and approach to definitive surgical management?
. Increased risk of deep vein thrombosis requiring prophylactic anticoagulation.
. Potential for early hardware failure due to increased mechanical stress from high BMI.
. Compromised soft tissue healing and elevated infection risk necessitating a staged approach.
. Difficulty in achieving adequate pain control postoperatively due to chronic nicotine use.
. Challenges in intraoperative glucose management impacting anesthetic choice.

Correct Answer & Explanation

. Compromised soft tissue healing and elevated infection risk necessitating a staged approach.

Explanation

The patient's history of daily tobacco use and poorly controlled Type 2 Diabetes Mellitus are critical factors that significantly impair soft tissue healing and elevate the risk of postoperative complications, particularly wound dehiscence, deep surgical site infection, delayed union, and nonunion. Nicotine is a potent vasoconstrictor, diminishing microvascular perfusion, while carbon monoxide reduces oxygen delivery. Hyperglycemia impairs leukocyte function, increasing infection susceptibility. These factors, combined with the severe Tscherne Grade III closed soft tissue injury described in the case, make a staged approach (Span, Scan, and Plan) absolutely paramount. Delaying definitive open reduction and internal fixation (ORIF) allows the soft tissue envelope to recover, edema to resolve, and patient comorbidities to be optimized, thereby drastically reducing the risk of catastrophic wound complications.

Question 1998

Topic: 2. Trauma

During the initial assessment of the patient's right lower extremity, intracompartmental pressure monitoring is performed due to equivocal clinical findings. The anterior compartment pressure is 42 mmHg, lateral is 38 mmHg, superficial posterior is 35 mmHg, and deep posterior is 45 mmHg. The patient's diastolic blood pressure is 85 mmHg. Based on these findings and the immediate management decision described in the case, what is the MOST appropriate next step?

. Immediate four-compartment fasciotomy of the right lower extremity.
. Observation with serial clinical examinations and repeat pressure measurements every hour.
. Administration of intravenous mannitol and elevation of the extremity.
. Application of a spanning external fixator to restore length and alignment.
. Emergent angiography to rule out arterial injury contributing to compartment pressures.

Correct Answer & Explanation

. Application of a spanning external fixator to restore length and alignment.

Explanation

Correct Answer: DThe case explicitly states that the delta pressure (Diastolic BP minus Compartment Pressure) for the deep posterior compartment is 40 mmHg (85 - 45 = 40) and for the anterior compartment is 43 mmHg (85 - 42 = 43). While these values hover near the generally accepted threshold of 30 mmHg for fasciotomy, the case also states, 'A decision is made to proceed with immediate spanning external fixation to restore length and alignment, which often significantly decreases intracompartmental pressures by reducing the volumetric mismatch caused by the shortened, displaced fracture.' This highlights a critical principle in high-energy fractures: restoring length and alignment with an external fixator can decompress the compartments by increasing the volume available for the swollen tissues, often obviating the need for fasciotomy. This is a common and appropriate initial management strategy for equivocal compartment syndrome in the setting of a severely displaced fracture.Option A is incorrectbecause while the pressures are elevated, the delta pressures are not definitively below 30 mmHg, and the case describes a specific decision to first apply an external fixator, which can resolve the issue without fasciotomy.Option B is incorrectbecause while serial examinations are always important, the pressures are significantly elevated, and a more active intervention (external fixation) is indicated to address the underlying cause of the pressure elevation (volumetric mismatch due to fracture displacement).Option C is incorrectbecause mannitol and elevation are adjunctive measures for compartment syndrome but are not definitive treatments, especially in the setting of a displaced fracture causing the pressure elevation.Option E is incorrectbecause while vascular assessment is paramount, the case states 'palpable but bounding dorsalis pedis and posterior tibial pulses' and 'Capillary refill in the digits is brisk.' Angiography is reserved for cases with signs of vascular compromise, which are not present here.

Question 1999

Topic: 2. Trauma
The patient's initial clinical examination reveals extensive fracture blisters, including both clear fluid-filled and hemorrhagic types, over the anterior and medial aspects of the distal tibia. The injury is classified as a Tscherne Grade III closed soft tissue injury. Which of the following statements accurately reflects the implications of these findings for definitive surgical planning?
. The presence of clear fluid-filled blisters indicates a less severe injury, allowing for immediate definitive fixation.
. Hemorrhagic blisters signify a deeper soft tissue insult and strictly contraindicate immediate surgical incisions through these zones.
. Tscherne Grade III injuries primarily impact bone healing and have minimal effect on wound complication rates.
. Fracture blisters are benign and can be incised and debrided immediately prior to definitive ORIF.
. The soft tissue envelope will typically recover sufficiently for definitive surgery within 3-5 days, regardless of blister type.

Correct Answer & Explanation

. Hemorrhagic blisters signify a deeper soft tissue insult and strictly contraindicate immediate surgical incisions through these zones.

Explanation

The presence of hemorrhagic blisters signifies a more severe soft tissue insult and strictly precludes any immediate surgical incisions through these zones. Hemorrhagic blisters indicate a deeper cleavage plane involving the dermal vascular plexus, signifying significant dermal compromise. Tscherne Grade III closed soft tissue injuries are characterized by severe skin contusion, extensive subcutaneous degloving, and impending compartment syndrome, all of which necessitate a delay in definitive surgery to allow for soft tissue recovery. Operating through compromised skin significantly increases the risk of wound dehiscence, infection, and flap necrosis.

Question 2000

Topic: 2. Trauma

Following the application of a spanning external fixator, a high-resolution Computed Tomography (CT) scan is obtained for detailed preoperative planning. Review the provided axial CT image of the distal tibia.

Based on the image and the case description, which of the following fracture fragments is MOST clearly demonstrated and described as being significantly impacted proximally into the metaphyseal void?

. The posterolateral (Volkmann) fragment.
. The medial malleolar fragment.
. The anterolateral (Chaput) fragment.
. The central die-punch fragment.
. The fibular fracture fragment.

Correct Answer & Explanation

. The central die-punch fragment.

Explanation

Correct Answer: DThe case description explicitly states, 'The CT scan clearly delineates a large, central die-punch fragment that is impacted 15 millimeters proximally into the metaphyseal void.' The axial CT image provided shows significant comminution of the articular surface, with a large central fragment driven proximally. This central impaction is a hallmark of high-energy pilon fractures and is critical to identify for surgical planning, as it requires elevation and bone grafting.Option A is incorrectbecause while a posterolateral (Volkmann) fragment may be present (and is mentioned in the case as part of the Topliss three-fragment pattern), the case specifically highlights the central die-punch fragment as being significantly impacted proximally.Option B is incorrectbecause the medial malleolar fragment is typically an avulsion or shear fracture of the medial column, not a centrally impacted fragment.Option C is incorrectbecause the anterolateral (Chaput) fragment is a peripheral articular fragment, often displaced, but not typically described as being impacted centrally into the metaphyseal void.Option E is incorrectbecause the fibular fracture is a separate injury of the lateral column and is not part of the tibial articular surface impaction.

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