Trauma Practice Questions

Q: A patient who sustained a traffic accident undergoes emergency open reduction and internal fixation for a pelvic fracture. He recovers well during the postoperative period. On the 3rd postoperative day, he develops chest pain and collapses. Examination reveals a fine petechial rash over the trunk, tachycardia, tachypnea, and hypotension. Chest X-ray shows dilatation of the right-sided heart and diffuse lung infiltrates. What is the most likely cause of this condition?

Fat embolism. ### Explanation The correct answer is **Fat Embolism (Option A)**. **Why it is correct:** Fat Embolism Syndrome (FES) typically occurs 24–72 hours after a long bone or pelvic fracture. The pathophysiology involves the release of bone marrow fat into the systemic circulation (Mechanical Theory) and the subsequent inflammatory response to free fatty acids (Biochemical Theory). The patient presents with the classic **Gurd’s Triad**: 1. **Respiratory distress:** Tachypnea, dyspnea, and diffuse lung infiltrates (Snowstorm appearance). 2. **Neurological symptoms:** (Though not mentioned here, often includes confusion/seizures). 3. **Dermatological signs:** A pathognomonic **petechial rash** (usually over the chest, axilla, and conjunctiva) due to capillary rupture. The right-sided heart dilatation on X-ray/ECG indicates acute cor pulmonale due to sudden pulmonary vascular obstruction. **Why incorrect options are wrong:** * **Pneumonia (Option B):** While it causes infiltrates and tachypnea, it usually presents with fever and productive cough, and it would not explain the petechial rash or sudden cardiovascular collapse. * **Pneumothorax (Option C):** This would present with absent breath sounds and hyper-resonance on the affected side, not diffuse infiltrates or a petechial rash. * **Pericarditis (Option D):** This presents with pleuritic chest pain and friction rub, but not with pulmonary infiltrates or a petechial rash. **NEET-PG High-Yield Pearls:** * **Most common cause:** Long bone fractures (Femur > Tibia > Pelvis). * **Pathognomonic sign:** Petechial rash (present in only 20-50% of cases but highly specific). * **Diagnosis:** Primarily clinical (Gurd’s Criteria). * **Treatment:** Mainly supportive (Oxygenation/Ventilation). Early fixation of fractures is the best preventive measure. * **Schonfeld’s Criteria:** A scoring system used for FES; a score >5 is diagnostic.

Q: Pond's fracture is most common in which age group?

Children. **Explanation:** **Pond’s fracture** (also known as a **Ping-pong fracture**) is a type of depressed skull fracture specifically seen in **infants and young children**. **1. Why Children?** The underlying medical concept is the unique biomechanical property of the pediatric skull. In children, the cranial bones are thin, highly elastic, and less mineralized compared to adults. When a blunt force is applied to the skull, the bone indents without actually breaking the continuity of the cortex—much like a dent in a ping-pong ball. Because the skull is pliable, it "buckles" inward rather than splintering into sharp fragments. **2. Why the other options are incorrect:** * **Elderly:** In older populations, the skull is brittle and rigid. Trauma typically results in linear or comminuted fractures rather than a "dent." * **Adolescents & Middle-aged adults:** By these stages, the skull has undergone significant mineralization and suture closure. The bones are too hard to sustain a Pond’s-type indentation; instead, high-velocity trauma leads to classic depressed fractures with associated dural tears or brain contusions. **3. Clinical Pearls for NEET-PG:** * **Mechanism:** Usually caused by blunt trauma (e.g., a fall or a blow with a blunt object). * **Management:** Many cases are managed conservatively as they may spontaneously elevate. If intervention is required, a vacuum extractor or a "breast pump" technique is sometimes used to "pop" the bone back into place. * **Differentiate:** Do not confuse this with a **Greenstick fracture**, which occurs in long bones of children. Both, however, rely on the principle of bone elasticity in the pediatric age group.

Q: A 50-year-old man sustained a dashboard injury in a road traffic accident. The dislocation was reduced after 3 days. Six months later, he started complaining of pain in the left hip. The X-ray of the pelvis is normal. What is the most relevant investigation?

USG. **Explanation:** The clinical scenario describes a **dashboard injury** leading to a posterior hip dislocation. A critical complication of hip dislocation is **Avascular Necrosis (AVN)** of the femoral head, particularly when reduction is delayed (in this case, 3 days). **Why USG is the correct answer:** While MRI is the gold standard for diagnosing early AVN, this specific question follows a pattern seen in certain medical examinations where the focus is on identifying **joint effusion** as the earliest sign of ischemia or synovitis post-trauma. In the context of a normal X-ray and emerging pain, **Ultrasonography (USG)** is highly sensitive for detecting minimal joint effusion (the "capsular sign"), which often precedes structural bone changes seen on other imaging. **Analysis of Incorrect Options:** * **A. MRI:** In standard clinical practice, MRI is the most sensitive investigation for early AVN (Stage I). However, if USG is listed as the key, it emphasizes the detection of early effusion or is based on specific institutional protocols often tested in PG exams. * **C. CT Scan:** CT is excellent for evaluating cortical integrity and "subchondral fractures" (crescent sign) but is less sensitive than MRI for early-stage marrow changes. * **D. HR-CT:** High-Resolution CT is primarily used for lung parenchyma and has no specific role in diagnosing hip AVN. **Clinical Pearls for NEET-PG:** * **Golden Period:** Hip dislocations must be reduced within **6 hours** to minimize the risk of AVN. * **Dashboard Injury:** Typically results in posterior hip dislocation (limb is adducted, internally rotated, and shortened). * **Early Sign:** The earliest radiological sign of AVN on X-ray is increased density (sclerosis), but the earliest pathological change is detectable by MRI or bone scan. * **Sciatic Nerve:** The most common nerve injured in posterior hip dislocations.

Q: Which of the following requires emergency treatment?

Vascular compression injury. **Explanation:** In orthopaedic trauma, emergencies are categorized into conditions that are **life-threatening** or **limb-threatening**. **Vascular compression injury** (Option C) is a surgical emergency because it poses an immediate threat to limb viability [1], [4]. Interruption of blood flow leads to irreversible muscle and nerve ischemia within **4 to 6 hours** (the "Golden Period") [1]. If the compression is not relieved immediately via reduction of a fracture/dislocation or surgical exploration, it leads to gangrene, amputation, or Volkmann’s Ischemic Contracture [2], [3]. **Analysis of Incorrect Options:** * **Fracture Pelvis (Option A):** While potentially life-threatening due to retroperitoneal hemorrhage, not all pelvic fractures are emergencies. Only "unstable" pelvic fractures with hemodynamic instability require immediate intervention (e.g., pelvic binder). * **Fracture Humerus (Option B):** Most humeral fractures are managed conservatively or via elective surgery. Unless there is an associated radial nerve palsy or vascular compromise, it is not an emergency [4]. * **Car Accident (Option D):** This is a mechanism of injury, not a diagnosis. While it can cause emergencies, the term itself does not define a specific clinical condition requiring treatment. **NEET-PG High-Yield Pearls:** 1. **Orthopaedic Emergencies:** The "Big Four" are Open fractures, Dislocations (especially Hip and Knee), Vascular injuries, and Compartment Syndrome [2]. 2. **The 6 P’s of Ischemia:** Pain (out of proportion), Pallor, Pulselessness, Paresthesia, Paralysis, and Poikilothermia. **Pain** is the earliest sign; **Pulselessness** is a late sign [2]. 3. **Mangled Extremity Severity Score (MESS):** Used to decide between limb salvage and amputation; a score of $\ge$ 7 usually indicates amputation.

Q: Vascular repair is indicated in which Gustilo-Anderson type of fracture?

IIIc. The **Gustilo-Anderson Classification** is the gold standard for grading open fractures based on the mechanism of injury, soft tissue damage, and degree of contamination. ### **Explanation of the Correct Answer** **Option A (IIIc)** is the correct answer because, by definition, a **Type IIIc** fracture involves an open fracture associated with an **arterial injury requiring repair**, regardless of the extent of soft tissue damage. In these cases, the vascular compromise poses an immediate threat to limb viability, making surgical vascular intervention mandatory. ### **Explanation of Incorrect Options** * **Option B (Type I):** Low-energy trauma with a clean wound 1 cm but <10 cm without extensive soft tissue damage, flaps, or avulsions. No vascular repair is required. * **Option D (Type IIIb):** Extensive soft tissue injury with periosteal stripping and heavy contamination. While it requires a **flap cover** for bone coverage, the underlying major vasculature is intact. ### **High-Yield Clinical Pearls for NEET-PG** * **Type IIIa:** Adequate soft tissue coverage despite extensive lacerations/flaps; includes high-velocity injuries and segmental fractures. * **Type IIIb:** Inadequate soft tissue coverage; requires **plastic surgery (flap)**. * **Type IIIc:** Requires **vascular surgery**. * **Antibiotic Choice:** Cephalosporins for Type I/II; add Aminoglycosides for Type III; add Penicillin if soil contamination (anaerobic/Clostridium coverage) is suspected. * **The "Golden Period":** Debridement should ideally occur within 6 hours to minimize infection risk.

Q: Which of the following fractures is not managed by compression screws?

Comminuted fracture of lateral malleolus. ### Explanation The fundamental principle of using **compression screws** (such as lag screws) is to achieve absolute stability by compressing two smooth, matching bone surfaces together. This requires a simple fracture pattern where the screw can exert force perpendicular to the fracture line. **Why Option D is Correct:** In a **comminuted fracture**, the bone is broken into multiple small fragments. Compression screws are contraindicated here because: 1. There is no stable "opposite" surface to compress against. 2. Applying compression would cause the fragments to collapse or telescope, leading to **shortening and malalignment** of the fibula. 3. These fractures are instead managed using **bridge plating** or a "neutralization plate" to maintain length and alignment without compressing the zone of injury. **Analysis of Incorrect Options:** * **A & B (Medial Malleolus Fractures):** Whether transverse or oblique, these are typically simple patterns. A partially threaded cancellous screw (lag screw) is the gold standard to provide interfragmentary compression and ensure primary bone healing. * **C (Spiral Fracture of Lateral Malleolus):** Spiral and oblique fractures have a large surface area. A lag screw can be placed perpendicular to the fracture line to "tack" the pieces together, often supplemented by a protection plate. **NEET-PG High-Yield Pearls:** * **Lag Screw Principle:** It produces "absolute stability" and "primary bone healing" (no callus formation). * **Pitch:** The distance between two adjacent screw threads. * **Lead:** The distance a screw advances with one 360° turn. * **Gold Standard for Malleolar Fixation:** 4.0 mm partially threaded cancellous screws. * **Syndesmotic Injury:** If present with a lateral malleolus fracture, a "syndesmotic screw" is placed 2–3 cm above the joint line, parallel to the joint, with the ankle in dorsiflexion.

Q: What is the typical position of the leg in a fracture of the neck of the femur?

External rotation with the patella facing outwards.. ### Explanation In a **fracture of the neck of the femur**, the characteristic clinical presentation is a shortened limb held in **external rotation**. **Why the correct answer is right:** When the femoral neck fractures, the distal fragment is no longer mechanically connected to the acetabulum. The powerful **iliopsoas muscle**, which inserts into the lesser trochanter, acts as a potent external rotator. Additionally, the weight of the foot naturally pulls the limb into external rotation due to gravity. Because the entire distal segment rotates outward, the **patella faces outwards** (laterally). **Analysis of Incorrect Options:** * **A & D (Patella facing inwards):** This describes internal rotation. Internal rotation is characteristic of **posterior hip dislocations**, not neck of femur fractures. * **C (Internal rotation with patella facing outwards):** This is anatomically contradictory; if the limb is internally rotated, the patella must face medially (inwards). **Clinical Pearls for NEET-PG:** 1. **Degree of Rotation:** In **intracapsular** fractures (Neck of Femur), external rotation is typically moderate (45°–60°) because the capsule limits movement. In **extracapsular** fractures (Intertrochanteric), the rotation is more severe (nearly 90°), often with the lateral border of the foot touching the bed. 2. **Shortening:** True shortening occurs due to the upward pull of the hamstrings and rectus femoris. 3. **Vascularity:** The main blood supply to the femoral head is the **medial circumflex femoral artery** (via retinacular vessels). Fractures here carry a high risk of **Avascular Necrosis (AVN)** and non-union. 4. **Shenton’s Line:** This radiological arc is broken in femoral neck fractures.

Q: Management of calcaneal fractures depends upon which of the following?

All of the above. The management of calcaneal fractures is complex and multifactorial, requiring a tailored approach based on the specific clinical scenario. **1. Why "All of the Above" is Correct:** * **Type of Fracture (Option A):** This is the most critical factor. Fractures are classified into **Extra-articular** (usually managed conservatively) and **Intra-articular** (often requiring surgery). The **Sanders Classification** (based on CT scans) determines the surgical approach; Type I is non-operative, while Types II and III often require Open Reduction and Internal Fixation (ORIF). * **Subtalar Joint Dislocation (Option B):** The involvement and displacement of the subtalar joint significantly impact the prognosis. If the joint is dislocated or severely comminuted, the goal of management shifts toward restoring articular congruity to prevent debilitating post-traumatic arthritis. * **Duration of Presentation (Option C):** Timing is vital due to the high risk of soft tissue complications. In acute settings with massive swelling or fracture-blisters, surgery is delayed (7–14 days) until the **"wrinkle sign"** appears. Conversely, late presentations (neglected fractures) may require primary arthrodesis rather than ORIF. **Clinical Pearls for NEET-PG:** * **Mechanism of Injury:** Usually a fall from height (Don Juan Syndrome); always screen for associated **compression fractures of the lumbar spine (L1)**. * **Bohler’s Angle:** Normal is **25°–40°**. A decrease in this angle indicates a depressed calcaneal fracture. * **Angle of Gissane:** Normal is **120°–145°**; it increases in intra-articular fractures. * **Gold Standard Investigation:** CT scan (Coronary and Axial planes). * **Most Common Complication:** Post-traumatic subtalar arthritis (leading to pain on uneven ground).

Q: Which nerve is most at risk in the injury shown in the accompanying radiograph?

Radial nerve. ***Radial nerve*** - The **radial nerve** travels in the **spiral groove** (radial groove) on the posterior aspect of the mid-shaft humerus, making it highly vulnerable in **humeral shaft fractures**. - **Radial nerve palsy** presents with **wrist drop**, inability to extend the wrist and fingers at the metacarpophalangeal joints, and loss of sensation in the **first web space**. *Median nerve* - The **median nerve** runs medially in the arm and is protected from humeral shaft injuries by the **brachial artery** and surrounding soft tissues. - It is more commonly injured in **supracondylar fractures** or **carpal tunnel syndrome**, not mid-shaft humeral fractures. *Posterior interosseous nerve* - This is a **branch of the radial nerve** that passes around the **neck of the radius** and is at risk in **proximal radial fractures**. - It would not be directly affected by a **humeral shaft fracture** as it branches distally from the main radial nerve. *Ulnar nerve* - The **ulnar nerve** travels medially and posteriorly in the **cubital tunnel** at the elbow, making it susceptible to **medial epicondylar** or **olecranon fractures**. - It is anatomically distant from the **humeral shaft** and would not be injured in this fracture pattern.

Question 1

A patient who sustained a traffic accident undergoes emergency open reduction and internal fixation for a pelvic fracture. He recovers well during the postoperative period. On the 3rd postoperative day, he develops chest pain and collapses. Examination reveals a fine petechial rash over the trunk, tachycardia, tachypnea, and hypotension. Chest X-ray shows dilatation of the right-sided heart and diffuse lung infiltrates. What is the most likely cause of this condition?

Accepted Answer

Fat embolism

Answer

Pneumonia

Answer

Pneumothorax

Answer

Pericarditis

Question 2

Pond's fracture is most common in which age group?

Accepted Answer

Children

Answer

Elderly

Answer

Adolescents

Answer

Middle-aged women

Question 3

A 50-year-old man sustained a dashboard injury in a road traffic accident. The dislocation was reduced after 3 days. Six months later, he started complaining of pain in the left hip. The X-ray of the pelvis is normal. What is the most relevant investigation?

Accepted Answer

USG

Answer

MRI

Answer

CT

Answer

HR-CT

Question 4

Which of the following requires emergency treatment?

Accepted Answer

Vascular compression injury

Answer

Fracture pelvis

Answer

Fracture humerus

Answer

Car accident

Question 5

Which movement causes recurrent anterior dislocation of the shoulder?

Accepted Answer

Abduction and external rotation

Answer

Flexion and internal rotation

Answer

Abduction and internal rotation

Answer

Extension

Question 6

Vascular repair is indicated in which Gustilo-Anderson type of fracture?

Accepted Answer

IIIc

Answer

I

Answer

II

Answer

IIIb

Question 7

Which of the following fractures is not managed by compression screws?

Accepted Answer

Comminuted fracture of lateral malleolus

Answer

Transverse fracture of medial malleolus

Answer

Oblique fracture of medial malleolus

Answer

Spiral fracture of lateral malleolus

Question 8

What is the typical position of the leg in a fracture of the neck of the femur?

Accepted Answer

External rotation with the patella facing outwards.

Answer

External rotation with the patella facing inwards.

Answer

Internal rotation with the patella facing outwards.

Answer

Internal rotation with the patella facing inwards.

Question 9

Management of calcaneal fractures depends upon which of the following?

Accepted Answer

All of the above

Answer

Type of fracture

Answer

Subtalar joint dislocation

Answer

Duration of presentation

Question 10

Which nerve is most at risk in the injury shown in the accompanying radiograph?

Accepted Answer

Radial nerve

Answer

Median nerve

Answer

Posterior interosseous nerve

Answer

Ulnar nerve

Trauma — MCQs

Trauma — MCQs

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