Trauma Practice Questions

Q: Which of the following is a complication of a talar fracture?

Avascular necrosis. **Explanation:** The **talus** is unique because approximately 60% of its surface is covered by articular cartilage, and it has no muscular or tendinous attachments. Its blood supply is **retrograde**, primarily entering through the neck via the artery of the tarsal canal (a branch of the posterior tibial artery). **Avascular Necrosis (AVN)** is the most dreaded and characteristic complication of talar neck fractures. When a fracture occurs, this tenuous retrograde blood supply is easily disrupted. The risk of AVN increases with the severity of displacement, as classified by the **Hawkins Classification**: * Type I (Undisplaced): 0–15% risk * Type II (Subluxation of subtalar joint): 20–50% risk * Type III (Subluxation of subtalar and ankle joints): 85–100% risk **Why other options are incorrect:** * **Non-union:** While it can occur, the talus has a relatively good healing capacity if the blood supply is preserved; AVN is far more frequent than non-union. * **Osteoarthritis (Ankle/Subtalar):** These are common *late* sequelae due to the intra-articular nature of the injury, but AVN is the "classic" and most high-yield complication associated specifically with the talus's unique vascular anatomy. **High-Yield Clinical Pearls for NEET-PG:** 1. **Hawkins Sign:** A subchondral radiolucent line seen on an X-ray at 6–8 weeks post-injury. It indicates intact vascularity (active bone resorption) and is a **positive prognostic sign** (rules out AVN). 2. **Most common site of fracture:** Talar neck. 3. **Snowboarder’s Fracture:** Fracture of the lateral process of the talus. 4. **Aviator’s Astragalus:** Historical term for talar fractures caused by high-energy dorsiflexion.

Q: A 60-year-old female presents after a fall in the bathroom, unable to stand. On examination, her right leg is in external rotation, with limited movement and tenderness in Scarpa's triangle. There is no history of fever. X-ray shows no fracture line. What is the next step in management?

MRI. **Explanation:** The clinical presentation of an elderly female with a fall, inability to bear weight, and a limb in **external rotation** with tenderness in **Scarpa’s triangle** is highly suspicious of a **fracture of the neck of the femur**, even if the initial X-ray is negative. **1. Why MRI is the Correct Choice:** In approximately 2–10% of hip fractures, the initial plain radiograph is negative or occult. In an elderly patient with a high clinical suspicion of a fracture (inability to walk, external rotation), **MRI is the gold standard** and the investigation of choice. It can detect bone marrow edema and occult fractures within 24 hours of injury with nearly 100% sensitivity. If MRI is contraindicated, a CT scan or Bone Scan (after 48–72 hours) may be considered. **2. Why Other Options are Incorrect:** * **Option B:** Bed rest and repeat X-ray is outdated. Delaying diagnosis in the elderly increases the risk of complications like DVT, pulmonary embolism, and pressure sores. * **Option C:** Joint aspiration is used to rule out septic arthritis. The absence of fever and the history of trauma make an occult fracture much more likely than infection. * **Option D:** Mobilizing a patient with a potential hip fracture without stabilization can lead to displacement of the fracture, damage to the blood supply (increasing the risk of AVN), and severe pain. **Clinical Pearls for NEET-PG:** * **Occult Fracture:** A fracture that is not visible on initial radiographs but is clinically suspected. * **Scarpa’s Triangle Tenderness:** A classic sign of intracapsular hip fractures. * **Garden’s Classification:** Used for femoral neck fractures; Stage I and II are undisplaced, while III and IV are displaced. * **Management Rule:** In elderly patients with hip pain post-trauma and negative X-rays, **always** assume a fracture until proven otherwise by MRI.

Q: What is the earliest sign of compartment syndrome of the leg?

Pain on passive stretch. **Explanation:** Compartment syndrome occurs when increased interstitial pressure within a closed osteofascial space compromises local perfusion. **Why "Pain on passive stretch" is the correct answer:** Pain is the most sensitive and earliest clinical indicator of compartment syndrome. Specifically, **pain out of proportion to the injury** and **pain on passive stretching** of the muscles within the affected compartment are the hallmark early signs. This occurs because stretching ischemic muscle fibers triggers an immediate nociceptive response before nerve conduction is lost or arterial flow is completely halted. **Analysis of Incorrect Options:** * **A. Tingling or numbness (Paresthesia):** This indicates nerve ischemia. While an important sign, it typically develops *after* the initial onset of ischemic pain. * **B. Skin mottling:** This is a late sign indicating significant vascular compromise and impending tissue necrosis. * **C. Pulselessness:** This is a **very late and ominous sign**. Because compartment pressure rarely exceeds systolic arterial pressure, distal pulses often remain palpable even when the tissue within the compartment is dying. Relying on pulselessness for diagnosis often leads to missed opportunities for limb salvage. **High-Yield Clinical Pearls for NEET-PG:** * **The 6 P’s:** Pain (earliest), Pallor, Paresthesia, Paralysis, Pulselessness (latest), and Poikilothermia. * **Diagnosis:** Primarily clinical. However, if uncertain, intra-compartmental pressure can be measured (e.g., Stryker device). * **Critical Pressure:** A **Delta pressure (Diastolic BP – Compartment Pressure) < 30 mmHg** is an absolute indication for fasciotomy. * **Most common site:** Deep posterior and anterior compartments of the leg (often following tibial fractures). * **Management:** Immediate emergency fasciotomy. Do not elevate the limb, as this reduces arterial inflow.

Q: Which among the following patients with a fracture requires the 1st priority to be informed to a senior?

Patient's finger is blackening. ### Explanation The correct answer is **A. Patient's finger is blackening**. **1. Why Option A is the Priority:** A blackening finger in the context of a fracture is a clinical sign of **impending gangrene** or severe **vascular compromise**. This is a surgical emergency. It indicates that the blood supply to the distal extremity is severely restricted, likely due to arterial injury, tight casting, or advanced **Compartment Syndrome**. If not addressed immediately (via vascular repair or fasciotomy), it leads to irreversible tissue necrosis and permanent loss of the limb. In triage, "Life over Limb, Limb over Function" is the rule; vascular compromise represents a threat to the limb. **2. Analysis of Incorrect Options:** * **B. Patient cannot extend his arm:** This suggests a nerve injury (e.g., Radial nerve palsy) or mechanical block. While serious, nerve injuries are rarely immediate emergencies compared to vascular compromise. * **C. A 10 cm abrasion:** This is a superficial soft tissue injury. While it requires cleaning and dressing to prevent infection, it is not limb-threatening. * **D. Intra-articular fracture:** These require anatomical reduction and surgery to prevent long-term secondary osteoarthritis, but they do not require the same "minutes-to-hours" urgency as a pulseless or blackening limb. **3. Clinical Pearls for NEET-PG:** * **The 5 P’s of Compartment Syndrome/Ischemia:** Pain (out of proportion), Pallor, Paresthesia, Pulselessness, and Paralysis. * **Earliest Sign:** Pain on passive stretching of muscles. * **Late Sign:** Pulselessness and blackening (indicates necrosis). * **Golden Hour:** Vascular repairs should ideally be performed within **6 hours** to prevent irreversible ischemic contracture (Volkmann’s Ischemic Contracture).

Q: Fat embolism syndrome is characterized by which of the following?

All of the above. **Explanation:** Fat Embolism Syndrome (FES) is a systemic inflammatory response to fat globules released into the circulation, typically following fractures of long bones (e.g., femur, tibia) or pelvic fractures. The diagnosis is primarily clinical, based on **Gurd’s Criteria**. 1. **Hypoxemia (B):** This is the most common early sign and a Major Criterion. Fat globules and free fatty acids cause direct endothelial damage in the pulmonary capillaries, leading to acute respiratory distress and impaired gas exchange. 2. **Tachycardia (A):** This is a Minor Criterion. It occurs as a compensatory response to hypoxia and systemic inflammatory response syndrome (SIRS). 3. **Fat globules in urine (C):** This is also a Minor Criterion (Lipuria). As fat enters the systemic circulation, it can be filtered by the kidneys and detected in the urine. Since all three features are recognized components of the clinical presentation and Gurd’s criteria, **Option D (All of the above)** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Dyspnea (Respiratory distress), Mental confusion (Cerebral involvement), and Petechial rashes (typically over the chest, axilla, and conjunctiva). * **Gurd’s Major Criteria:** Axillary/Subconjunctival petechiae, Hypoxemia ($PaO_2 < 60$ mmHg), CNS depression, and Pulmonary edema. * **Snowstorm Appearance:** The characteristic finding on a Chest X-ray (diffuse bilateral infiltrates). * **Treatment:** Primarily supportive (Oxygenation/Ventilation). Early stabilization and internal fixation of fractures are the best preventive measures. * **Free Fatty Acids:** These are the primary chemical mediators responsible for the lung parenchymal damage.

Q: What is the permissible ischemia time for proximal limb amputations?

6 hours. **Explanation:** The permissible ischemia time for an amputated part is dictated by the amount of muscle mass present. Muscle is highly sensitive to hypoxia; irreversible changes and necrosis begin within a few hours of oxygen deprivation. **1. Why 6 hours is correct:** Proximal limb amputations (e.g., arm, thigh) involve large volumes of skeletal muscle. Under **warm ischemia** (room temperature), the threshold for irreversible muscle necrosis is approximately **6 hours**. Replanting a limb after this window significantly increases the risk of "Reperfusion Injury" and "Crush Syndrome," where the release of myoglobin, potassium, and lactic acid into the systemic circulation can lead to acute renal failure and cardiac arrhythmias. **2. Analysis of Incorrect Options:** * **4 hours (A):** While safe, it is not the maximum permissible limit. * **8 hours (C) & 12 hours (D):** These exceed the safe threshold for warm ischemia in proximal segments. However, these timeframes are relevant for **distal amputations** (fingers/toes) because they contain minimal muscle and can tolerate longer periods of ischemia (up to 8 hours warm and 24+ hours cold). **Clinical Pearls for NEET-PG:** * **Cold Ischemia:** Cooling the amputated part (4°C) doubles the permissible time. For proximal limbs, cold ischemia time is **12 hours**; for distal parts, it can extend to **24 hours**. * **Golden Rule of Transport:** "Wrap in saline-soaked gauze, place in a plastic bag, and immerse the bag in a container of ice water." Never place the part directly on ice (prevents frostbite). * **Sequence of Repair in Replantation:** Bone fixation → Extensor tendons → Flexor tendons → Arteries → Nerves → Veins → Skin. (Mnemonic: **BEF-A-N-V-S**).

Q: The femur is fractured at which location?

Upper third of shaft. ***Upper third of shaft*** - The **upper third of the femoral shaft** is anatomically defined as the proximal portion between the **lesser trochanter** and the junction with the middle third. - Fractures here are significant due to **deforming muscle forces** - the **iliopsoas** and **gluteal muscles** cause **flexion and abduction** of the proximal fragment, making reduction challenging. *Middle third of shaft* - This region lies between the upper and lower thirds, roughly at the **mid-diaphysis** of the femur. - While common for femoral shaft fractures, it lacks the specific **anatomical landmarks** and **muscle deformity patterns** characteristic of upper third fractures. *Lower third of shaft* - Located in the **distal diaphysis**, approaching the **supracondylar region** near the knee joint. - Fractures here may involve the **gastrocnemius muscle** causing **posterior angulation** of the distal fragment, different from upper third mechanics. *Neck region* - Refers to the **femoral neck** between the **femoral head** and **intertrochanteric region**, not the shaft. - **Femoral neck fractures** have different classification systems (**Garden classification**) and are typically **intracapsular** with risk of **avascular necrosis**.

Q: All of the following show compression osteosynthesis except:

Champys mini plates.. **Explanation:** The core concept of **Compression Osteosynthesis** is the application of pressure across a fracture site to achieve primary bone healing. This stability minimizes interfragmentary motion and promotes direct cortical remodeling without callus formation. **Why Champy’s Miniplates are the correct answer:** Champy’s miniplates utilize the principle of **Stress Sharing (Semi-rigid fixation)** rather than compression. They are primarily used in mandibular fractures along "lines of tension." Instead of compressing the bone ends together, they neutralize tension forces while allowing the bone to bear the functional compressive load. Because they do not actively squeeze the fracture fragments together, they do not provide compression osteosynthesis. **Analysis of Incorrect Options:** * **Dynamic Compression Plates (DCP):** These achieve horizontal compression through the "spherical gliding principle." The screw head slides down the inclined plane of the plate hole, shifting the bone fragment toward the fracture line. * **Eccentric Compression Plates:** These are a variation of compression plating where screws are placed at the periphery (eccentrically) of the plate holes to exert a compressive force across the fracture. * **Lag Screw:** This is the most fundamental method of achieving **interfragmentary compression**. By engaging threads only in the far cortex, the screw pulls the two fragments together as it is tightened. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Bone Healing:** Occurs with rigid internal fixation (compression) and involves Haversian remodeling (no callus). * **Secondary Bone Healing:** Occurs with relative stability (e.g., intramedullary nails, casts) and involves callus formation. * **Gold Standard for Interfragmentary Compression:** The Lag Screw. * **Champy’s Principle:** Specifically refers to internal fixation of the mandible at the "ideal lines of osteosynthesis."

Question 1

Which of the following is a complication of a talar fracture?

Accepted Answer

Avascular necrosis

Answer

Non-union

Answer

Osteoarthritis of ankle joint

Answer

Osteoarthritis of subtalar joint

Question 2

A 60-year-old female presents after a fall in the bathroom, unable to stand. On examination, her right leg is in external rotation, with limited movement and tenderness in Scarpa's triangle. There is no history of fever. X-ray shows no fracture line. What is the next step in management?

Accepted Answer

MRI

Answer

Strict bed rest for 10 days and repeat X-ray

Answer

Joint aspiration

Answer

Start proper analgesia and begin mobilization to prevent stiffness

Question 3

What is the earliest sign of compartment syndrome of the leg?

Accepted Answer

Pain on passive stretch

Answer

Tingling or numbness

Answer

Skin mottling

Answer

Pulselessness

Question 4

Which among the following patients with a fracture requires the 1st priority to be informed to a senior?

Accepted Answer

Patient's finger is blackening

Answer

Patient cannot extend his arm

Answer

A 10 cm abrasion

Answer

Intra-articular fracture of the elbow joint

Question 5

Fat embolism syndrome is characterized by which of the following?

Accepted Answer

All of the above

Answer

Tachycardia

Answer

Hypoxemia

Answer

Fat globules in urine

Question 6

Nonunion is a very common complication of intracapsular fractures of the neck of femur. Which of the following is not a very important cause for the same?

Accepted Answer

Stress at fracture site due to muscle spasm

Answer

Inadequate immobilization

Answer

Inadequate blood supply

Answer

Inhibitory effect of synovial fluid

Question 7

All of the following are indications for open reduction and internal fixation of fractures except?

Accepted Answer

Compound fracture

Answer

Unsatisfactory closed reduction

Answer

Multiple trauma

Answer

Intra-articular fracture

Question 8

What is the permissible ischemia time for proximal limb amputations?

Accepted Answer

6 hours

Answer

4 hours

Answer

8 hours

Answer

12 hours

Question 9

The femur is fractured at which location?

Accepted Answer

Upper third of shaft

Answer

Middle third of shaft

Answer

Lower third of shaft

Answer

Neck region

Question 10

All of the following show compression osteosynthesis except:

Accepted Answer

Champys mini plates.

Answer

Dynamic compression plates.

Answer

Eccentric compression plates.

Answer

Lag screw.

Trauma — MCQs

Trauma — MCQs

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