Trauma Practice Questions

Q: A man operated for fracture femur developed dyspnea, severe chest pain, streaky hemoptysis, and hypotension on the 4th day. What is the most likely cause?

Fat embolism. **Explanation:** The clinical presentation described—dyspnea, chest pain, hemoptysis, and hypotension following a long bone fracture (femur)—is a classic triad of **Fat Embolism Syndrome (FES)**. **1. Why Fat Embolism is Correct:** Fat embolism typically occurs 24–72 hours after a fracture of long bones or pelvic bones. Mechanical trauma releases fat globules from the bone marrow into the systemic circulation, leading to mechanical obstruction and a secondary inflammatory response (chemical pneumonitis) due to free fatty acids. The classic triad includes **respiratory distress, neurological symptoms (confusion/seizures), and a petechial rash** (usually on the chest, axilla, and conjunctiva). **2. Why other options are incorrect:** * **Air Embolism:** Usually occurs acutely during surgery (e.g., neurosurgery in sitting position) or central line insertion, not typically on the 4th postoperative day. * **Pulmonary Embolism (Thromboembolism):** While it presents with similar symptoms, it usually occurs later (typically **1–2 weeks** post-surgery) and is less common on day 4 compared to FES in trauma patients. * **Meningitis:** While FES can cause neurological symptoms, meningitis would present with fever, neck stiffness, and positive Kernig’s sign, without the primary respiratory distress and hemoptysis seen here. **NEET-PG High-Yield Pearls:** * **Gurd’s Criteria:** Used for diagnosis (Major: Petechial rash, Respiratory insufficiency, Cerebral involvement). * **Snowstorm Appearance:** Characteristic finding on Chest X-ray. * **Treatment:** Primarily supportive (Oxygenation/Ventilation). Early stabilization of the fracture is the best preventive measure. * **Investigation of Choice:** Clinical diagnosis is paramount; however, MRI Brain (Starfield pattern) is sensitive for cerebral involvement.

Q: All are true about Barton's fracture except?

Dorsal Barton's fracture is the most common type. **Explanation:** Barton’s fracture is a specific type of distal radius fracture characterized by an **intra-articular shear fracture** of the radial rim with associated **radiocarpal subluxation** or dislocation. **1. Why Option C is the correct answer (The Exception):** Contrary to common belief, **Volar Barton’s fracture is much more common** than the Dorsal type. In clinical practice, Volar Barton’s is frequently encountered and is often considered a variant of Smith’s fracture (Type II). Therefore, the statement that Dorsal Barton's is the most common is incorrect. **2. Analysis of other options:** * **Option A (Intra-articular fracture):** This is true. Unlike Colles' or Smith's fractures, which are typically extra-articular, Barton’s specifically involves the articular surface of the distal radius. * **Option B (Radiocarpal subluxation):** This is a hallmark feature. The carpal bones follow the fractured articular fragment, leading to subluxation of the wrist joint. * **Option D (Requires ORIF):** Because Barton’s fracture is intra-articular and inherently unstable (due to the oblique fracture line and muscle pull), conservative management with a cast usually fails. **Open Reduction and Internal Fixation (ORIF)** with a Volar/Dorsal locking plate is the gold standard treatment. **Clinical Pearls for NEET-PG:** * **Mechanism:** Usually a fall on an outstretched hand (Dorsal) or a fall on the back of the wrist (Volar). * **Eponym Check:** * **Colles’:** Extra-articular, dorsal displacement (Dinner fork deformity). * **Smith’s:** Extra-articular, volar displacement (Garden spade deformity). * **Chauffeur’s:** Intra-articular fracture of the **Radial Styloid**. * **Management:** Barton’s fractures are "unstable" by definition; always look for "Buttress Plate" or "ORIF" in management questions.

Q: What is the treatment for a transverse fracture of the patella?

Wire fixation. **Explanation:** The patella is a sesamoid bone within the quadriceps tendon, and its primary function is to increase the mechanical advantage of the extensor mechanism. **Why Wire Fixation is Correct:** A transverse fracture of the patella is typically caused by indirect trauma (sudden forceful contraction of the quadriceps), leading to a **distraction injury**. This results in a gap between fragments and a loss of the active extensor mechanism. The gold standard treatment is **Tension Band Wiring (TBW)**. This technique converts the distracting tensile forces of the quadriceps into compressive forces across the fracture site, promoting primary bone healing and allowing for early range of motion. **Analysis of Incorrect Options:** * **Excision of a small fragment:** This is indicated only in comminuted fractures involving the inferior pole where the fragment is too small to fix. It is not the primary choice for a standard transverse fracture. * **Plaster cylinder:** This is used for **undisplaced fractures** where the extensor mechanism is intact. In a transverse fracture, the fragments are usually displaced, making conservative management inappropriate. * **Patellectomy:** This is a "salvage" procedure reserved for severely comminuted (shattered) fractures where reconstruction is impossible. It is avoided when possible because it significantly weakens the power of knee extension. **NEET-PG High-Yield Pearls:** * **Indication for Surgery:** Displacement >3mm or articular step-off >2mm. * **TBW Principle:** Converts tensile force to compressive force. * **Clinical Sign:** Inability to perform a **Straight Leg Raise (SLR)** indicates a disrupted extensor mechanism and necessitates surgical intervention. * **K-wires:** In TBW, two parallel Kirschner wires are used to provide rotational stability.

Q: Supracondylar fracture is usually caused by what type of injury?

Hyperextension injury. **Explanation:** Supracondylar fractures of the humerus are the most common elbow fractures in the pediatric population. The mechanism of injury is the primary basis for classifying these fractures into two types: Extension and Flexion. **Why Hyperextension is correct:** Approximately **95-98%** of supracondylar fractures are of the **Extension type**. This occurs due to a fall on an outstretched hand (FOOSH) with the elbow in hyperextension. In this position, the olecranon process of the ulna is forced into the olecranon fossa, acting as a fulcrum that levers the distal humerus forward, causing the fracture. The proximal fragment typically displaces anteriorly, potentially injuring the brachial artery or median nerve. **Why other options are incorrect:** * **Extension injury:** While "Extension type" is the clinical name, the specific mechanical force causing the failure is **hyperextension**. In a standard extension position, the bone is stable; the fracture occurs only when the physiological limit is exceeded (hyperextension). * **Hyperflexion injury:** This accounts for only **2-5%** of cases (Flexion type). It occurs from a direct blow to the posterior aspect of the flexed elbow. * **Axial rotation:** While rotation can influence the displacement pattern (posteromedial vs. posterolateral), it is a secondary force and not the primary cause of the fracture. **High-Yield Clinical Pearls for NEET-PG:** * **Most common nerve injured:** Anterior Interosseous Nerve (AIN)—a branch of the Median nerve (specifically in extension type). * **Most common vascular complication:** Brachial artery injury. * **Gartland Classification:** Used to grade displacement (Type I: Undisplaced; Type II: Angulated but posterior cortex intact; Type III: Completely displaced). * **Late Complication:** Cubitus varus deformity (Gunstock deformity) due to malunion.

Q: Hotchkiss terrible triad does not include which of the following injuries?

Olecranon fracture. The **Terrible Triad of the Elbow**, first described by Hotchkiss, refers to a specific injury pattern characterized by severe elbow instability. It is termed "terrible" because it historically carried a poor prognosis with high rates of chronic instability and arthrosis. ### **Explanation of the Correct Answer** **C. Olecranon fracture:** This is the correct answer because it is **not** part of the classic triad. While olecranon fractures can occur alongside elbow trauma, they are typically associated with "Monteggia fracture-dislocations" or "Trans-olecranon fracture-dislocations," which have different injury mechanisms and management protocols than the Hotchkiss triad. ### **Analysis of Incorrect Options** The Hotchkiss Terrible Triad consists of the following three components: * **B. Posterior elbow dislocation/subluxation:** Usually results from a fall on an outstretched hand (FOOSH) with the elbow in semi-flexion, leading to a posterolateral rotatory instability pattern. * **A. Radial head fracture:** The radial head acts as the primary secondary stabilizer against valgus stress; its fracture compromises lateral stability. * **D. Fracture of the coronoid process:** The coronoid process is the "key" anterior stabilizer. Even a small (Regan-Morrey Type I) fracture significantly increases the risk of recurrent posterior dislocation. ### **High-Yield Clinical Pearls for NEET-PG** * **Mechanism:** Valgus stress + Axial loading + Supination (Posterolateral Rotatory Instability). * **Primary Goal of Surgery:** To restore enough stability to allow for **early range of motion** to prevent elbow stiffness (the most common complication). * **Classification:** Coronoid fractures are classified by **Regan-Morrey**, while radial head fractures use the **Mason Classification**. * **Management Priority:** 1. Fix/Replace Radial Head → 2. Repair Coronoid/Anterior Capsule → 3. Repair Lateral Collateral Ligament (LCL).

Q: What is the management of hemarthrosis?

All of the above. **Explanation:** Hemarthrosis refers to bleeding into a joint cavity, most commonly occurring in the knee following trauma (e.g., ACL tear or patellar dislocation) or in patients with bleeding disorders like Hemophilia. The management strategy focuses on pain relief, pressure to control bleeding, and joint stabilization. **Why "All of the above" is correct:** The standard management of acute traumatic hemarthrosis follows a multimodal approach: 1. **Needle Aspiration (Arthrocentesis):** This is both diagnostic and therapeutic. Removing the blood under aseptic conditions provides immediate relief from intense pain caused by joint capsule distension and prevents the proteolytic enzymes in the blood from damaging the articular cartilage. 2. **Compression Bandage (Robert-Jones Bandage):** Applying a firm compression bandage helps limit further intra-articular bleeding and reduces inflammatory edema. 3. **Plaster of Paris (POP) Cast/Slab:** Immobilization is crucial to provide rest to the injured structures, prevent re-bleeding from movement, and alleviate muscle spasms. **Clinical Pearls for NEET-PG:** * **Rapid vs. Slow Swelling:** Swelling appearing within **0-2 hours** post-injury suggests **hemarthrosis** (vascular injury). Swelling appearing after **6-12 hours** suggests **traumatic effusion** (synovial fluid). * **Fat Globules:** If aspirated blood contains fat globules (lipohemarthrosis), it is pathognomonic for an **intra-articular fracture** (e.g., Tibial plateau fracture). * **Most Common Cause:** The most common cause of traumatic hemarthrosis in a stable joint is an **ACL tear**. * **Golden Rule:** Always rule out a fracture via X-ray before performing aspiration or applying a tight cast.

Q: Which nerve is commonly involved in a fracture of the distal shaft of the humerus?

Radial nerve. **Explanation:** The correct answer is **Radial nerve**. This is a classic high-yield anatomical relationship frequently tested in NEET-PG. **1. Why the Radial Nerve is Correct:** The radial nerve travels in the **spiral groove** (radial groove) located on the posterior aspect of the humerus. As it descends, it pierces the lateral intermuscular septum to enter the anterior compartment in the distal third of the arm. In fractures of the **distal third of the humeral shaft** (specifically **Holstein-Lewis fractures**), the nerve is prone to entrapment or laceration because it is relatively fixed against the bone at this site. **2. Why the Other Options are Incorrect:** * **Median Nerve:** This nerve travels medially and is more commonly injured in **supracondylar fractures** of the humerus (extension type), rather than shaft fractures. * **Ulnar Nerve:** The ulnar nerve is most vulnerable at the **medial epicondyle** (cubital tunnel). It is rarely involved in shaft fractures unless there is significant medial displacement. * **Circumflex Brachial (Axillary) Nerve:** This nerve winds around the **surgical neck** of the humerus. It is the most common nerve injured in proximal humerus fractures or anterior shoulder dislocations. **3. Clinical Pearls for NEET-PG:** * **Holstein-Lewis Fracture:** A spiral fracture of the distal 1/3rd of the humerus associated with radial nerve palsy. * **Clinical Sign:** Radial nerve injury leads to **Wrist Drop** (loss of wrist and finger extensors) and sensory loss over the first dorsal web space. * **Management:** Most radial nerve palsies in closed humeral fractures are **neuropraxias** and recover spontaneously (85-90% recovery rate). Immediate exploration is only indicated in open fractures or if the palsy develops *after* manipulation.

Question 1

What is the commonest hip injury in elderly patients?

Accepted Answer

Extracapsular fracture

Answer

Stress fracture

Answer

Impacted fracture of the neck of femur

Answer

Subcapital fracture of the neck of femur

Question 2

A man operated for fracture femur developed dyspnea, severe chest pain, streaky hemoptysis, and hypotension on the 4th day. What is the most likely cause?

Accepted Answer

Fat embolism

Answer

Air embolism

Answer

Pulmonary embolism

Answer

Meningitis

Question 3

All are true about Barton's fracture except?

Accepted Answer

Dorsal Barton's fracture is the most common type

Answer

Intra-articular fracture

Answer

Radiocarpal subluxation

Answer

Requires open reduction and internal fixation

Question 4

Colles fracture is characterized by which of the following?

Accepted Answer

Fracture line is approximately 2 cm proximal to the radiocarpal joint

Answer

Fracture line is at the radioulnar joint

Answer

Fracture line extends to the carpal joint

Answer

Distal fragment is ulnar deviated

Question 5

What is the treatment for a transverse fracture of the patella?

Accepted Answer

Wire fixation

Answer

Excision of a small fragment

Answer

Plaster cylinder

Answer

Patellectomy

Question 6

Supracondylar fracture is usually caused by what type of injury?

Accepted Answer

Hyperextension injury

Answer

Hyperflexion injury

Answer

Axial rotation

Answer

Extension injury

Question 7

What is the treatment of choice in pathological fractures?

Accepted Answer

Internal fixation

Answer

Plaster of Paris casts

Answer

Skin traction

Answer

External skeletal fixation

Question 8

Hotchkiss terrible triad does not include which of the following injuries?

Accepted Answer

Olecranon fracture

Answer

Head of radius fracture

Answer

Posterior elbow subluxation

Answer

Fracture of coronoid process

Question 9

What is the management of hemarthrosis?

Accepted Answer

All of the above

Answer

Compression bandage

Answer

Needle aspiration

Answer

Plaster of Paris cast

Question 10

Which nerve is commonly involved in a fracture of the distal shaft of the humerus?

Accepted Answer

Radial nerve

Answer

Median nerve

Answer

Ulnar nerve

Answer

Circumflex brachial nerve

Trauma — MCQs

Trauma — MCQs

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