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2. Trauma MCQs

Practice Set 96 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 1901

Topic: 2. Trauma

A 65-year-old female sustains a Lateral Compression Type II (LC-2) pelvic ring injury. By the Young-Burgess classification, this injury involves a fracture of which of the following posterior structures?

. Anterior sacroiliac ligament
. Interosseous sacroiliac ligament
. Sacrospinous ligament
. Ilium (crescent fracture)
. Sacral ala

Correct Answer & Explanation

. Ilium (crescent fracture)

Explanation

An LC-2 injury is defined by an anterior ring fracture combined with a posterior crescent fracture of the ilium. The LC-1 involves a sacral compression fracture.

Question 1902

Topic: 2. Trauma

A patient has a pelvic ring injury with a transverse fracture through the S2 foramina. According to the Denis classification, what zone does this represent, and what is the most likely neurologic deficit?

. Zone 1 with L5 weakness
. Zone 2 with sciatica
. Zone 3 with bowel and bladder dysfunction
. Zone 1 with intact neuro exam
. Zone 3 with L4 weakness

Correct Answer & Explanation

. Zone 3 with bowel and bladder dysfunction

Explanation

A Denis Zone 3 sacral fracture involves the central sacral canal. It carries the highest risk (up to 50%) of neurologic injury, particularly bowel, bladder, and sexual dysfunction due to injury to the sacral nerve roots.

Question 1903

Topic: Pelvic & Acetabular Trauma
A patient with an APC-III pelvic ring injury develops a large, fluctuant fluid collection over the greater trochanter after a high-speed motorcycle crash. Aspiration yields serosanguinous fluid. What is the pathophysiologic mechanism of this lesion?
. Rupture of the tensor fascia lata
. Shearing of the subcutaneous tissue from the underlying fascia
. Intramuscular hematoma of the gluteus medius
. Lymphatic duct tear
. Deep venous thrombosis

Correct Answer & Explanation

. Shearing of the subcutaneous tissue from the underlying fascia

Explanation

This presentation describes a Morel-Lavallée lesion, a closed degloving injury. It results from severe shearing forces that separate the subcutaneous fat from the underlying investing fascia, creating a potential space that fills with blood and lymph.

Question 1904

Topic: Pelvic & Acetabular Trauma
A 45-year-old male is treated for an APC-III pelvic ring injury. Follow-up radiographs reveal failure of the anterior symphyseal plate. What is the most common reason for failure of isolated anterior symphyseal plating in a completely unstable pelvic ring?
. Use of a 3.5mm rather than 4.5mm plate
. Failure to adequately stabilize the posterior pelvic ring
. Inadequate number of screws placed anteriorly
. Patient non-compliance with weight-bearing restrictions
. Over-reduction of the symphysis pubis

Correct Answer & Explanation

. Failure to adequately stabilize the posterior pelvic ring

Explanation

In a completely unstable pelvic ring injury (APC-III), isolated anterior fixation is biomechanically insufficient. Failure to adequately address and fix the posterior pelvic ring instability is the leading cause of anterior hardware failure.

Question 1905

Topic: Pelvic & Acetabular Trauma

A trauma patient is transferred from an outside hospital with a pelvic binder in place for 36 hours. What is the most immediate clinical complication specifically associated with prolonged continuous pelvic binder application?

. Binder-induced lateral femoral cutaneous nerve palsy
. Skin necrosis and pressure ulceration
. Iatrogenic bladder rupture
. Deep vein thrombosis
. Heterotopic ossification

Correct Answer & Explanation

. Skin necrosis and pressure ulceration

Explanation

Prolonged application of a pelvic binder (especially > 24 hours) strongly increases the risk of skin necrosis and pressure ulcerations, most commonly over the greater trochanters. Binders should be removed or converted to definitive fixation as soon as hemodynamically feasible.

Question 1906

Topic: 2. Trauma

In the Tile classification of pelvic ring injuries, a Tile Type C injury is primarily characterized by which of the following biomechanical features?

. Rotationally unstable but vertically stable
. Rotationally and vertically unstable
. Stable anteriorly but unstable posteriorly
. Isolated anterior ring fracture
. Bilateral pubic rami fractures only

Correct Answer & Explanation

. Rotationally and vertically unstable

Explanation

In the Tile classification, Type A injuries are stable, Type B are rotationally unstable but vertically stable, and Type C injuries are both rotationally and vertically unstable due to complete disruption of the posterior pelvic floor.

Question 1907

Topic: Pelvic & Acetabular Trauma

Which ligamentous structure is considered the strongest in the pelvis and provides the most significant resistance to vertical shear forces acting on the sacroiliac joint?

. Sacrospinous ligament
. Sacrotuberous ligament
. Interosseous sacroiliac ligament
. Anterior sacroiliac ligament
. Iliolumbar ligament

Correct Answer & Explanation

. Interosseous sacroiliac ligament

Explanation

The interosseous sacroiliac ligament is the strongest ligament in the body and acts as the primary stabilizer against both vertical shear and anterior-posterior translational forces at the SI joint.

Question 1908

Topic: 2. Trauma

A patient sustains an open pelvic ring injury with a large perineal wound and gross fecal contamination. Following acute hemorrhage control and temporary skeletal stabilization, what is the next most critical surgical step to reduce mortality?

. Immediate definitive internal fixation of the posterior ring
. Application of a bilateral hip spica cast
. Diverting colostomy and aggressive wound debridement
. Prophylactic internal iliac artery embolization
. Placement of an inferior vena cava filter

Correct Answer & Explanation

. Diverting colostomy and aggressive wound debridement

Explanation

Open pelvic fractures with perineal or rectal involvement carry a very high risk of fatal sepsis. Aggressive wound debridement combined with a diverting colostomy is essential to minimize fecal contamination and reduce mortality.

Question 1909

Topic: 2. Trauma
Which of the following pelvic ring injury patterns is classically associated with the highest requirement for massive blood transfusion and the highest overall mortality rate?
. Lateral Compression Type I (LC-1)
. Lateral Compression Type II (LC-2)
. Anteroposterior Compression Type III (APC-III)
. Isolated iliac wing fracture (Duverney fracture)
. Transverse sacral fracture (Denis Zone 3)

Correct Answer & Explanation

. Anteroposterior Compression Type III (APC-III)

Explanation

APC-III injuries (open book pelvis) result in a massive increase in pelvic volume, allowing for unchecked retroperitoneal hemorrhage. They are associated with the highest rates of massive transfusion and overall mortality compared to other patterns.

Question 1910

Topic: Pelvic & Acetabular Trauma

In the surgical management of a completely unstable sacroiliac joint disruption, what is the primary biomechanical advantage of utilizing two iliosacral screws rather than a single screw?

. Prevention of coronal plane translation
. Increased resistance to rotational forces
. Prevention of sacral nerve root impingement
. Elimination of the need for anterior ring fixation
. Decreased risk of encountering sacral dysmorphism

Correct Answer & Explanation

. Increased resistance to rotational forces

Explanation

While a single iliosacral screw adequately resists vertical and anterior-posterior translation, a second screw provides significantly increased resistance to rotational forces, which is essential in highly unstable injuries.

Question 1911

Topic: Pelvic & Acetabular Trauma

A 35-year-old male is brought in hemodynamically unstable after a motorcycle crash. A pelvic binder is applied. Which of the following anatomic structures is responsible for the vast majority (approximately 80%) of hemorrhage in pelvic ring injuries?

. Superior gluteal artery
. Internal pudendal artery
. Presacral venous plexus and cancellous bone
. External iliac artery
. Corona mortis

Correct Answer & Explanation

. Presacral venous plexus and cancellous bone

Explanation

Approximately 80% of pelvic hemorrhage following trauma originates from the presacral venous plexus and fractured cancellous bone surfaces. Arterial bleeding accounts for a smaller percentage but may require arterial embolization.

Question 1912

Topic: 2. Trauma

A 55-year-old female presents with an ankle fracture after a fall from a height. Initial radiographs are concerning for a pilon fracture. A pre-operative CT scan, as conceptually illustrated below, reveals a posterolateral pilon fracture with significant articular impaction and a 3mm articular step-off. The soft tissues are swollen but without blistering, and the 'wrinkle sign' is present. Which of the following is the most appropriate initial management strategy?

. Immediate open reduction and internal fixation (ORIF) via a posterolateral approach.
. Closed reduction and casting with delayed weight-bearing.
. External fixation with delayed ORIF once soft tissue swelling subsides.
. Immediate ankle arthrodesis due to articular impaction.
. Non-weight bearing in a walking boot with physical therapy.

Correct Answer & Explanation

. External fixation with delayed ORIF once soft tissue swelling subsides.

Explanation

Correct Answer: CHigh-energy pilon fractures, especially with significant articular impaction and comminution, often present with severe soft tissue swelling. The presence of the 'wrinkle sign' indicates that the soft tissue envelope is improving but does not necessarily mean it is ready for definitive internal fixation, particularly for a high-energy injury like a pilon fracture. Staged management, beginning with external fixation to stabilize the fracture, restore length, and allow the soft tissue swelling to subside, is the most appropriate initial strategy. Definitive ORIF is then performed once the soft tissue envelope is quiescent (typically 7-14 days).Option A (Immediate ORIF):While the fracture pattern dictates ORIF, immediate surgery for a high-energy pilon fracture with significant swelling, even with a 'wrinkle sign,' carries a high risk of wound complications (dehiscence, infection, necrosis). Delaying definitive fixation is generally safer.Option B (Closed reduction and casting):This is highly unlikely to achieve or maintain anatomical reduction of a displaced posterolateral pilon fracture with articular impaction, leading to poor outcomes and post-traumatic arthritis.Option D (Immediate ankle arthrodesis):While severe post-traumatic arthritis can be a sequela, primary arthrodesis is rarely indicated for acute pilon fractures unless there is extensive bone loss, irrecoverable articular damage, or severe patient comorbidities precluding reconstruction. The goal is always to preserve the joint if possible.Option E (Non-weight bearing in a walking boot):A walking boot provides insufficient immobilization and protection for a displaced pilon fracture and would not allow for anatomical reduction or healing, leading to malunion and severe post-traumatic arthritis.

Question 1913

Topic: 2. Trauma

A 42-year-old construction worker presents with a complex ankle fracture after a fall. A CT scan, conceptually shown below, reveals a posterolateral pilon fracture with significant comminution and a large metaphyseal defect after reduction of the articular fragments. During the posterolateral approach, after achieving anatomical reduction of the articular fragments and temporary K-wire fixation, what is the most appropriate next step to ensure stable fixation and prevent collapse?

. Apply a 1/3 tubular plate to the posterior aspect of the fibula.
. Perform a syndesmotic screw fixation.
. Place bone graft beneath the reduced articular fragments.
. Immediately close the wound and apply a cast.
. Insert a single lag screw from anterior to posterior.

Correct Answer & Explanation

. Place bone graft beneath the reduced articular fragments.

Explanation

Correct Answer: CIn posterolateral pilon fractures with significant comminution and a metaphyseal defect, simply reducing the articular fragments and fixing them with plates/screws may not be sufficient. The underlying bone loss can lead to collapse of the articular surface over time, resulting in malunion and post-traumatic arthritis. Placing bone graft (autograft or allograft) beneath the reduced articular fragments provides structural support, preventing collapse and promoting healing. This is a critical step in managing these high-energy injuries.Option A (Apply a 1/3 tubular plate to the posterior aspect of the fibula):While fibular fixation is often necessary in combined injuries, it addresses the fibula, not the metaphyseal defect of the tibia. Fibular fixation is typically done to restore length and rotation, which can aid in tibial reduction, but it doesn't directly support the tibial articular surface from collapse.Option B (Perform a syndesmotic screw fixation):Syndesmotic fixation is indicated if instability persists after reduction of the posterior malleolus and fibula. While important, it does not address the metaphyseal bone defect in a pilon fracture.Option D (Immediately close the wound and apply a cast):This would be premature and neglect the critical step of providing structural support to the reduced articular fragments, leading to likely failure of fixation and collapse.Option E (Insert a single lag screw from anterior to posterior):Lag screws are used for interfragmentary compression, typically from posterior to anterior in this approach. While important for fragment fixation, a single lag screw alone would not provide adequate buttress support or address a significant metaphyseal defect in a comminuted pilon fracture.

Question 1914

Topic: 2. Trauma

A 32-year-old male presents with a displaced posterior malleolus fracture involving 18% of the articular surface, along with a stable lateral malleolus fracture. A CT scan, conceptually shown below, confirms a 3mm articular step-off. The patient is otherwise healthy. According to current literature guidelines, what is the most appropriate management strategy?

. Non-operative management with casting and non-weight bearing.
. Indirect reduction and percutaneous screw fixation.
. Open reduction and internal fixation (ORIF) via a posterolateral approach.
. Immediate ankle arthrodesis.
. External fixation as definitive management.

Correct Answer & Explanation

. Open reduction and internal fixation (ORIF) via a posterolateral approach.

Explanation

Correct Answer: CWhile historically a 25-30% involvement of the articular surface was a common threshold for posterior malleolus fixation, current literature suggests that smaller fragments (e.g., 10-15% or more) warrant operative fixation if they are displaced (>2mm step-off/gap) or contribute to syndesmotic instability. In this case, an 18% fragment with a 3mm articular step-off clearly meets the criteria for operative intervention to restore articular congruity and prevent post-traumatic arthritis. The posterolateral approach offers direct visualization and facilitates anatomical reduction and stable internal fixation.Option A (Non-operative management):Non-operative management is typically reserved for minimally displaced fragments (<2mm step-off) and smaller fragment sizes (<10-15%) without syndesmotic instability. A 3mm step-off is significant and requires surgical correction.Option B (Indirect reduction and percutaneous screw fixation):Indirect reduction techniques are often unreliable in achieving and maintaining anatomical congruity, especially for displaced fragments. Direct visualization via an open approach is preferred to ensure anatomical reduction.Option D (Immediate ankle arthrodesis):Ankle arthrodesis is a salvage procedure for end-stage arthritis and is not indicated as a primary treatment for an acute, reconstructible posterior malleolus fracture.Option E (External fixation as definitive management):External fixation is primarily used as a temporizing measure for severe soft tissue injuries or highly comminuted pilon fractures, or for definitive management in rare cases of severe comorbidities. It is not appropriate for definitive management of a displaced posterior malleolus fracture requiring articular reduction.

Question 1915

Topic: 2. Trauma

A 48-year-old male presents with a complex ankle fracture. Pre-operative planning includes a CT scan, conceptually shown below, which confirms a posterolateral pilon fracture with significant articular involvement. The patient is scheduled for ORIF via a posterolateral approach. Which of the following patient positions offers the best direct visualization of the entire posterior aspect of the distal tibia and fibula for this approach?

. Supine position with the leg internally rotated.
. Lateral decubitus position with the injured leg superior.
. Prone position.
. Beach chair position.
. Lithotomy position.

Correct Answer & Explanation

. Prone position.

Explanation

Correct Answer: CThe prone position offers excellent direct visualization of the entire posterior aspect of the distal tibia and fibula, which is crucial for addressing posterolateral pilon and posterior malleolus fractures. It allows for easy access to the posterior aspect of both the tibia and fibula, facilitating combined fixation if a fibular fracture is also present.Option A (Supine position with the leg internally rotated):While some posterior malleolus fractures can be approached indirectly or with a limited posterior incision in supine, it does not provide the comprehensive direct visualization needed for complex posterolateral pilon fractures or large posterior malleolus fragments.Option B (Lateral decubitus position):The lateral decubitus position can be used for the posterolateral approach, and it offers easier anesthetic access. However, direct visualization posteriorly can be more challenging than in prone, and maintaining stable exposure may require specialized leg holders or additional assistants.Option D (Beach chair position):The beach chair position is typically used for shoulder surgery and is not suitable for ankle surgery.Option E (Lithotomy position):The lithotomy position is used for perineal or lower abdominal surgery and is not suitable for this ankle approach.

Question 1916

Topic: 2. Trauma

A 70-year-old patient undergoes ORIF of a complex trimalleolar ankle fracture, including a large, displaced posterior malleolus fragment, via a posterolateral approach. Post-operatively, the patient is placed in a well-padded posterior splint. At the 6-week follow-up, radiographs, conceptually shown below, demonstrate early signs of fracture healing, and the patient reports minimal pain. What is the most appropriate next step in the rehabilitation protocol?

. Full weight-bearing in a regular shoe.
. Initiate aggressive ankle strengthening exercises with resistance bands.
. Transition to a removable walking boot (CAM walker) with gradual progression to partial weight-bearing.
. Immediate return to pre-injury activities, including running and jumping.
. Continue non-weight bearing in the posterior splint for another 6 weeks.

Correct Answer & Explanation

. Transition to a removable walking boot (CAM walker) with gradual progression to partial weight-bearing.

Explanation

Correct Answer: CFor complex ankle fractures, especially those involving the posterior malleolus and requiring ORIF, non-weight bearing (NWB) is typically maintained for 6-8 weeks. At 6 weeks, with radiographic evidence of early healing and minimal pain, the patient can usually transition from a posterior splint to a removable walking boot (CAM walker). This allows for controlled protection while gradually progressing to partial weight-bearing (PWB) over the next 4-6 weeks, as tolerated and guided by clinical and radiographic assessment. Gentle active and passive range of motion exercises can also be initiated out of the boot.Option A (Full weight-bearing in a regular shoe):Full weight-bearing at 6 weeks is too early for a complex trimalleolar fracture, risking hardware failure, loss of reduction, or delayed healing.Option B (Initiate aggressive ankle strengthening exercises):While gentle range of motion and isometric exercises can begin, aggressive strengthening with resistance bands is typically reserved for later phases (Phase 3: Advanced Strengthening & Functional Return), after significant weight-bearing has been achieved and fracture healing is more robust.Option D (Immediate return to pre-injury activities):This is far too early and would almost certainly lead to re-injury or complications. Return to sport/activity is typically 4-6 months or longer, depending on the injury and patient.Option E (Continue non-weight bearing in the posterior splint for another 6 weeks):While some complex pilon fractures might require longer NWB, for a posterior malleolus fracture with early healing at 6 weeks, continuing strict NWB in a splint for another 6 weeks is overly conservative and would delay rehabilitation unnecessarily. Transitioning to a boot with PWB is the appropriate next step.

Question 1917

Topic: 2. Trauma

A 35-year-old male undergoes ORIF of a posterolateral pilon fracture. During the procedure, after reduction of the articular fragments, the surgeon notes a significant metaphyseal defect. Bone graft is placed to support the articular surface. For definitive fixation, which of the following plating strategies is most appropriate for this fracture pattern?

. Anterior plating with a conventional non-locking plate.
. Medial plating with a 1/3 tubular plate.
. Posterior or posterolateral locking plate fixation providing buttress support.
. External fixation as the sole definitive treatment.
. Isolated lag screw fixation without a plate.

Correct Answer & Explanation

. Posterior or posterolateral locking plate fixation providing buttress support.

Explanation

Correct Answer: CFor posterolateral pilon fractures, specialized posterior pilon plates (often pre-contoured) or conventional locking plates applied to the posterior or posterolateral surface of the distal tibia are most appropriate. These plates provide crucial buttress support to the articular fragments, preventing posterior displacement and collapse, especially when there is a metaphyseal defect that has been grafted. Locking plates offer angular stability, which is beneficial in comminuted fractures and osteopenic bone.Option A (Anterior plating):Anterior plating is used for anterior pilon fragments but would not provide direct buttress support for a posterolateral fragment and would require a separate incision or extensive soft tissue dissection.Option B (Medial plating):Medial plating is used for medial malleolus fractures or medial pilon fragments. It would not adequately address a posterolateral pilon fracture.Option D (External fixation as the sole definitive treatment):While external fixation can be a temporizing measure, it is rarely the sole definitive treatment for displaced articular pilon fractures, as it does not allow for anatomical reduction and stable internal fixation of the articular surface, leading to poor outcomes.Option E (Isolated lag screw fixation without a plate):While lag screws are critical for interfragmentary compression, isolated lag screw fixation is generally insufficient for complex pilon fractures with comminution and metaphyseal defects. A plate is needed to provide buttress support and overall construct stability.

Question 1918

Topic: 2. Trauma

A 50-year-old male presents with a chronic, symptomatic malunion of a posterior malleolus fracture, which was initially treated non-operatively. He experiences persistent pain, stiffness, and limited range of motion. Radiographs and a CT scan, conceptually shown below, confirm a significant residual articular step-off and altered ankle mechanics. Which of the following complications is he most likely experiencing, and what is the most appropriate long-term management strategy?

. Sural nerve neuroma; surgical exploration and neurolysis.
. Hardware irritation; hardware removal.
. Deep vein thrombosis; anticoagulation therapy.
. Post-traumatic arthritis; ankle arthrodesis or total ankle arthroplasty.
. Syndesmotic malreduction; revision syndesmotic fixation.

Correct Answer & Explanation

. Post-traumatic arthritis; ankle arthrodesis or total ankle arthroplasty.

Explanation

Correct Answer: DThe description of a chronic, symptomatic malunion with persistent pain, stiffness, limited range of motion, and significant residual articular step-off strongly indicates the development of post-traumatic arthritis (PTA). Malunion and residual articular incongruity are primary causes of PTA. For advanced, diffuse PTA with debilitating symptoms, long-term management options include ankle arthrodesis (fusion) or total ankle arthroplasty (replacement), depending on patient factors and surgeon preference.Option A (Sural nerve neuroma):While sural nerve injury is a known complication of the posterolateral approach, it typically presents with neuropathic pain and sensory deficits, not primarily with chronic stiffness, limited ROM, and altered ankle mechanics from a malunion. Also, this patient was treated non-operatively, so surgical nerve injury is less likely.Option B (Hardware irritation):This patient was treated non-operatively, so there is no hardware to cause irritation.Option C (Deep vein thrombosis):DVT is an acute complication, typically presenting with calf pain and swelling, and is managed with anticoagulation. It does not explain chronic malunion symptoms.Option E (Syndesmotic malreduction):While syndesmotic malreduction can lead to pain and instability, the primary issue described is a malunion of the posterior malleolus itself, leading to articular incongruity and arthritis, rather than isolated syndesmotic issues. Revision syndesmotic fixation would not address the established arthritis from the malunion.

Question 1919

Topic: 2. Trauma
During surgical repair of a terrible triad injury, the surgeon encounters an O'Driscoll Type I coronoid fracture, characterized by a >2mm fragment from the tip. The fragment is displaced and contributes to the overall instability. The surgeon has gained adequate exposure through a lateral approach. Which of the following is the most appropriate technique for managing this coronoid fracture, considering its size and the overall instability of a TTI?
. Excision of the coronoid fragment to prevent impingement.
. Suture lasso/lariat technique using sutures passed through drill holes in the proximal ulna.
. Lag screw fixation from a separate medial approach.
. Small plate fixation for rigid stability.
. Non-operative management with immobilization in flexion.

Correct Answer & Explanation

. Suture lasso/lariat technique using sutures passed through drill holes in the proximal ulna.

Explanation

For small to medium-sized fragments (O'Driscoll Type I/II), sutures are passed through drill holes in the proximal ulna, lassoing the coronoid fragment and tying it down, restoring its position. Excision is incorrect as the coronoid is a critical stabilizer. Lag screw or plate fixation are typically reserved for larger, non-comminuted fragments or comminuted basal fractures (O'Driscoll Type III).

Question 1920

Topic: Upper Extremity Trauma

A patient is 3 months post-operative from a terrible triad repair. They complain of persistent elbow stiffness and a palpable, painful mass around the elbow. Radiographs confirm the presence of mature heterotopic ossification (HO) that is functionally limiting. Which of the following is the most appropriate management strategy for this patient's heterotopic ossification, and what prophylactic measure could have been considered immediately post-operatively?

. Immediate surgical excision of the HO and aggressive passive stretching.
. Non-operative management with NSAIDs and continued physical therapy, with surgical excision considered after maturation if functionally limiting; prophylaxis with Indomethacin or radiation therapy.
. Radiation therapy as a primary treatment for mature HO.
. Manipulation under anesthesia (MUA) to break up the HO.
. Total elbow arthroplasty due to severe stiffness and HO.

Correct Answer & Explanation

. Non-operative management with NSAIDs and continued physical therapy, with surgical excision considered after maturation if functionally limiting; prophylaxis with Indomethacin or radiation therapy.

Explanation

Correct Answer: BThe case, under 'Complications & Management' for Heterotopic Ossification (HO), states: 'Prophylaxis: Indomethacin (for 3-6 weeks post-op) or radiation therapy (single dose within 24-72 hours). Salvage Strategies: Surgical excision after maturation (typically 6-12 months post-onset) if functionally limiting.' Since the HO is mature and functionally limiting, surgical excision is a consideration, but it's important to ensure full maturation and to have considered prophylaxis.Option A (immediate surgical excision) is incorrect because excision should ideally occur after maturation (typically 6-12 months post-onset) to minimize recurrence. Option C (radiation therapy as primary treatment for mature HO) is incorrect; radiation is primarily a prophylactic measure, not a treatment for mature, functionally limiting HO. Option D (MUA) is for stiffness, but not specifically for breaking up mature HO. Option E (total elbow arthroplasty) is a salvage procedure for end-stage arthritis, not the primary treatment for HO.

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