Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 111: What is the most common cause of vascular injury in supracondylar fractures in children?

A. Supracondylar humerus fracture (Correct Answer)
B. Lateral condyle humerus fracture
C. Medial condyle humerus fracture
D. Both bone forearm fracture

Explanation: **Explanation:** **Supracondylar humerus fractures** are the most common fractures around the elbow in children (peaking at ages 5–8). The **Gartland Type III (displaced)** extension-type fracture is the most frequent cause of vascular injury. In these cases, the sharp proximal fracture fragment is displaced anteriorly, where it can tether, pinch, or lacerate the **brachial artery**, which lies directly in front of the distal humerus. This can lead to an absent radial pulse or, in severe cases, Volkmann’s Ischemic Contracture. **Analysis of Incorrect Options:** * **Lateral Condyle Humerus Fracture:** While common, these are intra-articular fractures that usually involve minor displacement or rotation. They are more notorious for causing **cubitus valgus** and **tardy ulnar nerve palsy** rather than acute vascular compromise. * **Medial Condyle Humerus Fracture:** These are rare in children. While they may involve the ulnar nerve, they are not typically associated with major arterial injury. * **Both Bone Forearm Fracture:** These are very common pediatric fractures but usually result in soft tissue swelling or compartment syndrome rather than direct major vascular (brachial artery) injury. **Clinical Pearls for NEET-PG:** * **Most common nerve injured:** Anterior Interosseous Nerve (AIN) – branch of the Median nerve (test by asking the child to make an "OK" sign). * **Most common nerve in Flexion-type:** Ulnar nerve. * **Pink Pulseless Hand:** A clinical scenario where the hand is warm/perfused but the radial pulse is absent; it requires urgent reduction. * **Golden Rule:** Always check the distal neurovascular status before and after splinting/reduction.

Question 112: What is a Galeazzi fracture?

A. Fracture of the distal third of the radius with distal radioulnar joint (DRUJ) subluxation (Correct Answer)
B. Fracture of the proximal third of the radius with distal radioulnar joint (DRUJ) subluxation
C. Fracture of the distal third of the radius without distal radioulnar joint (DRUJ) subluxation
D. Fracture of the proximal third of the radius without distal radioulnar joint (DRUJ) subluxation

Explanation: **Explanation:** A **Galeazzi fracture-dislocation** (also known as a "fracture of necessity") is defined as a fracture of the **distal third of the radial shaft** associated with a dislocation or subluxation of the **distal radioulnar joint (DRUJ)**. **Why Option A is Correct:** The mechanism typically involves a fall on an outstretched hand with the forearm in pronation. The radius fractures at its weakest point (distal third), and the force is transmitted distally, disrupting the ligaments of the DRUJ (specifically the triangular fibrocartilage complex). This combination of a bony fracture and joint disruption makes it inherently unstable. **Analysis of Incorrect Options:** * **Options B & D:** Fractures of the **proximal third** of the radius are not Galeazzi fractures. If a proximal ulnar fracture occurs with a radial head dislocation, it is termed a **Monteggia fracture**. * **Option C:** A fracture of the distal radius without DRUJ involvement is simply an isolated radial shaft fracture. The hallmark of a Galeazzi injury is the mandatory involvement of the DRUJ. **High-Yield Clinical Pearls for NEET-PG:** * **"Fracture of Necessity":** It is called this because closed reduction in adults almost always fails due to the pull of the brachioradialis and thumb extensors; therefore, **Open Reduction and Internal Fixation (ORIF)** with a plate and screws is the treatment of choice. * **Reverse Galeazzi (Piedmont Fracture):** This involves a fracture of the distal third of the **ulna** with dislocation of the **proximal** radioulnar joint. * **Mnemonic (MUGR):** **M**onteggia = **U**lna fracture (proximal); **G**aleazzi = **R**adius fracture (distal).

Question 113: What is the most common cause of fracture in a patient with hemophilia?

A. Osteoporosis and restricted joint movement (Correct Answer)
B. Osteonecrosis
C. Iron deposition
D. Pseudo-tumors

Explanation: In Hemophilia, the primary musculoskeletal complication is recurrent **hemarthrosis** (bleeding into joints), which initiates a cycle leading to increased fracture risk. ### **Why Option A is Correct** The pathophysiology of fractures in hemophilic patients is multifactorial: 1. **Disuse Osteoporosis:** Recurrent joint bleeds lead to chronic pain and immobilization. This lack of weight-bearing results in localized and systemic bone loss (osteoporosis). 2. **Restricted Joint Movement:** Chronic synovitis leads to joint fibrosis and contractures. These stiff joints act as poor shock absorbers; when a minor stress or fall occurs, the force is transmitted directly to the brittle, osteoporotic bone rather than being dissipated by joint motion, resulting in a fracture. 3. **Hyperemia:** Chronic inflammation of the synovium increases local blood flow, which further promotes bone resorption. ### **Analysis of Incorrect Options** * **B. Osteonecrosis:** While it can occur (especially in the femoral head due to increased intra-articular pressure from bleeds), it is a much rarer cause of fracture compared to the generalized weakening from osteoporosis. * **C. Iron deposition:** Hemosiderin (iron) deposition in the synovium causes synovial hypertrophy and cartilage destruction (hemophilic arthropathy), but it does not directly cause fractures. * **D. Pseudo-tumors:** These are rare, progressive cystic lesions caused by subperiosteal or intramuscular hemorrhages. While they can cause pathological fractures, they are a localized complication and not the "most common" cause of fractures in the general hemophilic population. ### **NEET-PG High-Yield Pearls** * **Most common joint involved:** Knee > Elbow > Ankle. * **Earliest radiographic sign:** Soft tissue swelling. * **Characteristic X-ray finding:** Squaring of the inferior pole of the patella (Jordan's Sign) and widening of the intercondylar notch of the femur. * **Management of Acute Bleed:** Factor replacement is the priority, followed by RICE (Rest, Ice, Compression, Elevation).

Question 114: Fracture of the femur at the level of the isthmus is best treated by?

A. Intramedullary nail fixation (Correct Answer)
B. Plate and screws
C. Closed reduction
D. External fixation

Explanation: **Explanation:** The **isthmus** of the femur is the narrowest part of the medullary canal, located at the junction of the proximal and middle thirds of the shaft. For femoral shaft fractures, **Intramedullary (IM) nailing** is the gold standard treatment. **Why Intramedullary Nailing is Correct:** 1. **Load-Sharing Device:** Unlike plates, which are load-bearing, an IM nail is a load-sharing device. It is positioned in the mechanical axis of the bone, allowing for early weight-bearing. 2. **Biological Fixation:** It allows for "indirect healing" via callus formation by preserving the fracture hematoma and the periosteal blood supply (as it is a closed procedure). 3. **Anatomical Fit:** At the isthmus, the nail achieves maximum "endosteal contact," providing superior rotational and axial stability. **Why Other Options are Incorrect:** * **Plate and Screws:** Requires extensive soft tissue stripping and carries a higher risk of infection and non-union due to disruption of the periosteal blood supply. It is generally reserved for fractures where nailing is impossible (e.g., very narrow canals or distal/proximal extensions). * **Closed Reduction:** Femoral shaft fractures cannot be maintained by casting or traction in adults due to the powerful pull of the thigh muscles, leading to malunion and shortening. * **External Fixation:** Primarily used as a temporary "damage control" measure in polytrauma patients or open fractures with severe soft tissue contamination. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard:** Reamed antegrade IM nailing is the treatment of choice for femoral shaft fractures (Winquist classification). * **Positioning:** The entry point for antegrade nailing is the **Piriformis fossa** or the **Greater trochanter**. * **Complication:** The most common systemic complication of femoral shaft fractures is **Fat Embolism Syndrome**. * **Blood Loss:** A closed femoral shaft fracture can lead to 1000–1500 ml of internal blood loss.

Question 115: Maximum shortening of the lower limb is seen in fractures of which part of the femur?

A. Shaft of femur (Correct Answer)
B. Neck of femur
C. Intertrochanteric region of femur
D. Transcervical fracture of femur

Explanation: **Explanation:** The degree of shortening in femoral fractures is primarily determined by the **magnitude of muscle pull** acting on the bone fragments. **1. Why Shaft of Femur is Correct:** The femoral shaft is surrounded by the body's most powerful muscle groups (quadriceps, hamstrings, and adductors). When a fracture occurs here, these muscles undergo intense spasm, causing significant **proximal migration** (overlapping) of the distal fragment. This results in the maximum clinical shortening, often ranging from **3 to 5 cm** or more. **2. Analysis of Incorrect Options:** * **Neck of Femur (B) & Transcervical (D):** These are intracapsular fractures. The strong hip capsule and the iliofemoral ligament (Bigelow's ligament) act as a sleeve that limits the upward displacement of the distal fragment. Shortening is typically minimal, usually **1 to 2 cm**. * **Intertrochanteric Region (C):** While these are extracapsular and can show more shortening than neck fractures (due to the pull of the gluteal muscles), the displacement is still generally less than that seen in mid-shaft fractures where the entire length of the thigh muscles contributes to the deformity. **3. Clinical Pearls for NEET-PG:** * **Shortening Rule of Thumb:** Shaft (>3 cm) > Intertrochanteric (2–3 cm) > Neck of Femur (1–2 cm). * **Deformity Profile:** Neck of femur fractures present with **external rotation of 45°**, whereas Intertrochanteric fractures present with more exaggerated **external rotation of nearly 90°** (as the fracture is outside the capsule). * **Thomas Splint:** Specifically designed to counteract the powerful muscle pull in shaft fractures to maintain length and prevent further soft tissue injury.

Question 116: A 7-year-old boy presented with a fracture of the left subcondylar region with undisturbed occlusion. What is the recommended treatment?

A. Immobilization for 7 days
B. Immobilization for 14 days with intermittent active opening
C. No immobilization with restricted mouth opening for 10 days
D. No immobilization and active treatment (Correct Answer)

Explanation: ### **Explanation** The management of pediatric condylar and subcondylar fractures is primarily **conservative**, focusing on the restoration of function rather than anatomical reduction. **Why Option D is Correct:** In children, the condyle has a high osteogenic potential and remarkable remodeling capacity. For a subcondylar fracture with **undisturbed occlusion**, the goal is to prevent **ankylosis** (the most dreaded complication in children). * **Active treatment** refers to immediate functional rehabilitation (active jaw exercises). * Avoiding immobilization prevents the organization of a hematoma into a bony or fibrous bridge, ensuring the joint remains mobile while the fracture heals and remodels. **Analysis of Incorrect Options:** * **Options A & B (Immobilization):** Any period of complete immobilization (Maxillomandibular Fixation - MMF) in a child increases the risk of permanent joint stiffness and temporomandibular joint (TMJ) ankylosis. If MMF is ever required due to malocclusion, it is strictly limited to 7–10 days, followed by vigorous physiotherapy. * **Option C (Restricted mouth opening):** Restricting movement is counterproductive. In cases with normal occlusion, the patient should be encouraged to use the jaw within pain limits to maintain the functional matrix and stimulate proper remodeling. **Clinical Pearls for NEET-PG:** * **Most common site of Mandible fracture in children:** Condyle (due to the high vascularity and thin neck). * **Management Principle:** "Function guides Form." Conservative/Functional management is the gold standard for pediatric condylar fractures. * **Indication for Surgery (ORIF):** Displacement into the middle cranial fossa, lateral extracapsular displacement, or presence of a foreign body. * **Complication of neglected fracture:** Unilateral fracture leads to facial asymmetry (deviation to the side of injury); Bilateral fracture leads to "Bird-face deformity" (micrognathia).

Question 117: In classical scaphoid cast, what is the position of the wrist?

A. Dorsal and radial flexion
B. Dorsal and ulnar flexion (Correct Answer)
C. Ventral and ulnar flexion
D. Ventral and radial flexion

Explanation: ### Explanation The scaphoid is the most commonly fractured carpal bone, typically occurring due to a fall on an outstretched hand (FOOSH). The goal of the **Scaphoid Cast** (also known as a Navicular cast) is to immobilize the bone in a position that optimizes fragment apposition and reduces tension on the fracture site. **Why "Dorsal and Ulnar Flexion" is Correct:** The scaphoid bone lies obliquely in the proximal row of the carpus. To achieve maximum stability: 1. **Dorsal Flexion (Extension):** Slight extension (approx. 10-20°) places the carpal bones in a stable, functional position. 2. **Ulnar Deviation (Flexion):** This is the critical component. Ulnar deviation causes the scaphoid to elongate and "stand up" (verticalize), which compresses the fracture fragments together, promoting primary bone healing. Additionally, the cast must include the thumb (up to the interphalangeal joint) in a "glass-holding" or "opposed" position to neutralize the pull of the abductor pollicis longus. **Analysis of Incorrect Options:** * **Ventral (Volar) Flexion:** Placing the wrist in flexion increases the instability of the carpal rows and is functionally poor for grip strength. * **Radial Flexion (Deviation):** Radial deviation causes the scaphoid to "foreshorten" or tilt anteriorly (palmar flexion). In a fracture, this movement can cause displacement or gapping at the fracture site, increasing the risk of non-union. **High-Yield Clinical Pearls for NEET-PG:** * **Cast Extent:** From the upper forearm to the distal palmar crease, including the thumb proximal phalanx (Thumb Spica). * **Blood Supply:** The scaphoid has a **retrograde blood supply** (from distal to proximal). Fractures at the **proximal pole** have the highest risk of **Avascular Necrosis (AVN)**. * **Radiology:** If initial X-rays are negative but clinical suspicion (tenderness in the **Anatomical Snuffbox**) is high, apply a scaphoid cast and repeat X-rays in **10–14 days**. * **Most Common Site:** The **waist** of the scaphoid.

Question 118: Which of the following statements regarding shoulder dislocation is true?

A. Posterior dislocation is often overlooked.
B. Pain is severe in anterior dislocation.
C. Radiography may be misleading in posterior dislocation.
D. All of the above. (Correct Answer)

Explanation: The correct answer is **D. All of the above.** Shoulder dislocations are a high-yield topic for NEET-PG, particularly the distinction between anterior and posterior types. ### **Detailed Explanation** * **Posterior dislocation is often overlooked (Option A):** Unlike anterior dislocations, which present with a prominent "squared-off" shoulder, posterior dislocations have subtle clinical findings. They are frequently missed (up to 50% of cases) because the arm is held in internal rotation and adduction, which can be mistaken for a simple soft tissue injury or frozen shoulder. * **Pain is severe in anterior dislocation (Option B):** Anterior dislocation (the most common type, >95%) is associated with intense pain, muscle spasms, and a complete inability to move the arm. The patient typically holds the arm in slight abduction and external rotation. * **Radiography may be misleading in posterior dislocation (Option C):** On a standard Anteroposterior (AP) view, a posterior dislocation can look deceptively normal. Key subtle signs include the **"Light Bulb Sign"** (the internally rotated humeral head looks circular) and the **"Empty Glenoid Sign."** An **Axillary view** or Scapular Y-view is essential to confirm the diagnosis. ### **NEET-PG High-Yield Pearls** * **Mechanism for Posterior Dislocation:** Classically occurs during **Seizures, Electric shocks**, or high-energy trauma (Triple 'E': Epilepsy, Electricity, Ethanol). * **Most Common Nerve Injury:** **Axillary nerve** (tested by sensation over the "Regimental Badge" area), most common in anterior dislocations. * **Hill-Sachs Lesion:** A compression fracture of the posterosuperolateral humeral head (seen in anterior dislocations). * **Reverse Hill-Sachs (McLaughlin Lesion):** An impaction fracture of the anterior humeral head (seen in posterior dislocations). * **Bankart Lesion:** Avulsion of the anterior-inferior glenoid labrum.

Question 119: Banka's lesion is seen at which anatomical location?

A. Posterior surface of glenoid labrum
B. Anterior surface of glenoid labrum (Correct Answer)
C. Anterior part of head of humerus
D. Posterior part of head of humerus

Explanation: **Explanation:** A **Bankart lesion** is the hallmark pathological finding in recurrent **anterior shoulder dislocation**. It occurs when the humeral head is forced out of the glenoid cavity, causing an avulsion of the **anteroinferior glenoid labrum** along with the attached inferior glenohumeral ligament (IGHL) complex. * **Why Option B is Correct:** The mechanism of most shoulder dislocations is anterior-inferior. As the humeral head displaces forward, it shears off the **anterior surface of the glenoid labrum**. This loss of the "chock-block" effect leads to joint instability and recurrent dislocations. * **Why Option A is Incorrect:** A lesion at the posterior labrum is known as a **Reverse Bankart lesion**, which is associated with posterior shoulder dislocations (commonly seen in seizures or electric shocks). * **Why Option C is Incorrect:** This is a distractor. While the anterior head may be involved in other pathologies, the specific "Bankart" eponym refers to the labrum. * **Why Option D is Incorrect:** A compression fracture on the **posterosuperior aspect of the humeral head** is known as a **Hill-Sachs lesion**. It occurs when the humeral head impacts the sharp anterior glenoid rim during an anterior dislocation. **High-Yield Clinical Pearls for NEET-PG:** 1. **Bony Bankart:** When the labral avulsion includes a fracture of the anterior glenoid rim. 2. **Hill-Sachs Lesion:** The "companion" bony injury to a Bankart lesion, found on the posterior humeral head. 3. **Gold Standard Investigation:** **MRI Arthrography** is the investigation of choice to visualize labral tears. 4. **Surgery:** The **Bankart Repair** (reattaching the labrum) is the standard surgical treatment for recurrent instability.

Question 120: Which of the following statements regarding vertebral fractures is false?

A. Hangman fracture involves the axis (C2 vertebra).
B. Clay shoveler's fracture typically involves the lower cervical vertebrae (e.g., C6-C7). (Correct Answer)
C. Jefferson's fracture involves the atlas (C1 vertebra).
D. Undertaker's fracture involves the C6-C7 disc space.

Explanation: **Explanation** In the context of this question, **Option B** is the "false" statement because of a technicality in the description of the fracture site. While **Clay shoveler’s fracture** does involve the lower cervical (C6, C7) or upper thoracic (T1) vertebrae, it is specifically an **avulsion fracture of the spinous process**, not a fracture of the vertebral body or the entire vertebra itself. It is caused by sudden muscle contraction (trapezius/rhomboids) or direct trauma. **Analysis of other options:** * **Option A (Hangman’s Fracture):** This is a true statement. It refers to a traumatic spondylolisthesis of the **Axis (C2)**, specifically involving bilateral fractures through the pars interarticularis, usually caused by hyperextension. * **Option C (Jefferson’s Fracture):** This is a true statement. It is a **burst fracture of the Atlas (C1)**, involving both the anterior and posterior arches, typically caused by axial loading (e.g., diving into a shallow pool). * **Option D (Undertaker’s Fracture):** This is a true statement. It is a classic forensic/orthopaedic term for a fracture-dislocation occurring at the **C6-C7 level**, often seen in cadavers or due to extreme hyperextension of the neck during handling. **NEET-PG High-Yield Pearls:** * **Stable vs. Unstable:** Jefferson and Clay shoveler’s fractures are generally stable; Hangman’s is potentially unstable. * **Mechanism of Injury:** Jefferson = Axial loading; Hangman = Hyperextension; Clay shoveler = Hyperflexion/Avulsion. * **Odontoid Fractures:** Type II (fracture through the base of the dens) is the most common and has the highest risk of non-union.

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Open Fractures

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Fractures in Children

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Trauma — MCQs

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