Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 861: All of the following are associated with supracondylar fracture of humerus, except?

A. It is uncommon after 15 years of age
B. Extension type fracture is more common than the flexion type
C. Cubitus varus deformity commonly results following malunion
D. Ulnar nerve is most commonly involved (Correct Answer)

Explanation: **Explanation:** Supracondylar fracture of the humerus is the most common pediatric elbow fracture. Understanding its complications and anatomy is crucial for NEET-PG. **Why Option D is the correct answer (The Exception):** In supracondylar fractures, the **Median nerve** (specifically the **Anterior Interosseous Nerve branch**) is the most commonly injured nerve in the extension type, followed by the Radial nerve. The **Ulnar nerve** is rarely injured in the primary trauma; it is more commonly associated with the rare **flexion-type** fracture or occurs iatrogenically during medial percutaneous pinning. **Analysis of other options:** * **Option A:** This fracture is primarily seen in children (peak age 5–8 years) because the supracondylar area is thin and weak during skeletal development. After age 15, the physis closes and the bone strengthens, making dislocations more common than fractures. * **Option B:** **Extension type** accounts for approximately **95-98%** of cases, usually resulting from a fall on an outstretched hand. Flexion type is rare (2-5%). * **Option C:** **Cubitus varus** (Gunstock deformity) is the most common late complication due to malunion (specifically due to uncorrected coronal tilt or internal rotation). While it is a cosmetic deformity, it rarely affects function. **Clinical Pearls for NEET-PG:** * **Most common complication:** Cubitus varus (Malunion). * **Most serious complication:** Volkmann’s Ischemic Contracture (VIC) due to brachial artery injury or compartment syndrome. * **Gartland Classification:** Used to grade displacement (Type I: Undisplaced; Type II: Displaced with intact posterior cortex; Type III: Completely displaced). * **Radiological Sign:** Look for the **"Fat pad sign"** (occult fracture) and the **Anterior Humeral Line** (which should normally bisect the middle third of the capitellum).

Question 862: A 40-year-old patient presents with an inability to keep the arm in contact with the chest. When the arm is forcibly brought into contact with the chest, there is winging of the scapula. There is a history of repeated intramuscular injections into the deltoid muscle. What is the diagnosis?

A. Serratus anterior muscle palsy
B. Poliomyelitis
C. Deltoid contracture (Correct Answer)
D. Neglected anterior dislocation of the shoulder

Explanation: ### **Explanation** The clinical presentation described is a classic case of **Deltoid Contracture**, most commonly caused by repeated intramuscular injections (fibrosis) or congenital factors. **1. Why Deltoid Contracture is Correct:** The deltoid muscle is the primary abductor of the shoulder. When the muscle undergoes fibrosis and contracture, it shortens, pulling the humerus into a fixed state of abduction. This results in the **"Abduction Deformity"** (inability to bring the arm to the side of the chest). When the clinician forcibly adducts the arm against this resistance, the scapula is pulled laterally and rotates, leading to **secondary winging of the scapula**. This is a mechanical consequence of the tight fibrous bands pulling on the acromion and scapular spine. **2. Analysis of Incorrect Options:** * **Serratus Anterior Palsy:** While this causes winging of the scapula, the winging occurs during *forward pushing* movements (paralysis of long thoracic nerve), not specifically during forced adduction of the arm. It does not cause an abduction deformity. * **Poliomyelitis:** While polio can cause muscle wasting and secondary contractures, the specific mechanical sign of winging upon forced adduction is pathognomonic for deltoid fibrosis. * **Neglected Anterior Dislocation:** This presents with a "squared-off shoulder" and a positive **Dugas Test** (inability to touch the opposite shoulder). However, it does not typically cause scapular winging upon forced adduction. **3. Clinical Pearls for NEET-PG:** * **Etiology:** Repeated IM injections (commonly Pentazocine or antibiotics) lead to focal ischemia and fibrosis. * **Clinical Sign:** The "dimple sign" or a palpable fibrous band within the deltoid muscle is often present. * **Management:** Surgical release of the fibrous bands (distal or proximal) is the treatment of choice if conservative stretching fails. * **Differential:** Always distinguish from **Sprengel’s deformity**, which involves a high-riding scapula.

Question 863: What is the best imaging modality to distinguish acute osteomyelitis from a soft tissue infection?

A. Clinical examination
B. X-ray
C. CT scan
D. MRI (Correct Answer)

Explanation: **Explanation:** The gold standard and most accurate imaging modality for distinguishing acute osteomyelitis from a soft tissue infection (like cellulitis or abscess) is **MRI**. **Why MRI is the Correct Answer:** MRI offers superior soft-tissue contrast and high sensitivity (90-100%) for detecting early bone marrow changes. In acute osteomyelitis, MRI can detect **bone marrow edema** (low signal on T1, high signal on T2/STIR) as early as 1–2 days after the onset of infection. It clearly demarcates whether the inflammatory process is confined to the soft tissues or has breached the cortex to involve the marrow, which is critical for diagnosis. **Why Other Options are Incorrect:** * **Clinical Examination:** While essential for initial suspicion (rubor, tumor, calor, dolor), it cannot definitively differentiate between deep cellulitis and underlying bone involvement. * **X-ray:** Plain radiographs are insensitive in the early stages. Bone changes (periosteal reaction or bone destruction) typically do not appear until **10–14 days** after infection begins and require at least 30-50% bone mineral loss to be visible. * **CT Scan:** While excellent for identifying sequestrum (dead bone) in chronic osteomyelitis or cortical destruction, it is less sensitive than MRI for early marrow edema and involves significant radiation. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest sign on X-ray:** Soft tissue swelling. * **Earliest sign on MRI:** Bone marrow edema. * **Triple Phase Bone Scan (Technetium-99m):** Highly sensitive but lacks the anatomical detail of MRI; it is often used if MRI is contraindicated. * **Gold Standard for Diagnosis:** Bone biopsy and culture (though MRI is the best *imaging*).

Question 864: Careless handling of a suspected case of cervical spine injury may result in what complication?

A. Injury to the spinal cord leading to quadriparesis or quadriplegia (Correct Answer)
B. Intracranial haemorrhage with cerebral irritation or unconsciousness
C. Cervical haematoma with compression of brachial vessels
D. Complete paralysis of the affected upper extremity

Explanation: ### Explanation **Correct Option: A. Injury to the spinal cord leading to quadriparesis or quadriplegia** The cervical spine houses the upper portion of the spinal cord. In a suspected cervical injury, the vertebral column may be unstable due to fractures (e.g., Jefferson or Hangman’s fracture) or ligamentous disruptions. **Careless handling**, such as improper lifting or failure to use a rigid cervical collar, can cause displacement of these unstable segments. This leads to secondary mechanical compression or transection of the spinal cord above the level of **C5**, resulting in **quadriplegia** (loss of motor/sensory function in all four limbs) and potentially fatal respiratory failure due to phrenic nerve involvement (C3-C5). **Why Incorrect Options are Wrong:** * **B. Intracranial haemorrhage:** This is typically caused by direct head trauma or vascular ruptures (e.g., ruptured aneurysm), not by the mechanical manipulation of the cervical vertebrae. * **C. Cervical haematoma:** While a hematoma can occur with neck trauma, the primary risk of "careless handling" is neurological damage to the cord, not vascular compression of the brachial vessels, which are located more laterally and inferiorly. * **D. Complete paralysis of the affected upper extremity:** This describes a monoplegia or a brachial plexus injury. Cervical cord damage at the level of the neck would typically affect both sides (bilateral) and include the lower limbs. **High-Yield Clinical Pearls for NEET-PG:** * **Log-rolling:** The gold-standard technique for moving patients with suspected spinal injuries to maintain neutral alignment. * **Airway Management:** In cervical spine injuries, use the **Jaw Thrust** maneuver instead of Head-Tilt/Chin-Lift to avoid cord compression. * **Nexus Criteria/Canadian C-Spine Rules:** Used clinically to determine the need for cervical spine imaging. * **Diaphragmatic Paralysis:** Injuries above **C3, C4, C5** "keep the diaphragm alive." Lesions above this level lead to immediate respiratory arrest.

Question 865: A fracture of the talus without displacement is visualized on X-ray. What is the most likely complication?

A. Osteoarthritis of the ankle (Correct Answer)
B. Osteonecrosis of the head of the talus
C. Avascular necrosis of the body of the talus
D. Avascular necrosis of the neck of the talus

Explanation: **Explanation:** Fractures of the talus are notorious for their high complication rates due to the bone's unique anatomy—it is 60% covered by articular cartilage and has a precarious retrograde blood supply. **Why Option A is Correct:** While Avascular Necrosis (AVN) is a feared complication of talar neck fractures, **Osteoarthritis (OA)** of the ankle or subtalar joint is actually the **most common** overall complication, even in undisplaced fractures. This occurs because the talus is an intra-articular bone; any fracture, even without displacement, can cause chondral damage or subtle joint incongruity, leading to secondary degenerative changes over time. **Analysis of Incorrect Options:** * **B, C, and D (AVN):** AVN is a classic complication of talar neck fractures (Hawkins Classification). However, in **undisplaced** fractures (Hawkins Type I), the risk of AVN is relatively low (0–15%). When AVN does occur, it typically involves the **body** of the talus because the blood supply enters through the neck and flows retrogradely to the body. AVN of the "head" or "neck" specifically is anatomically incorrect in this clinical context. **NEET-PG High-Yield Pearls:** * **Hawkins Sign:** A subchondral radiolucent line in the talar dome seen on X-ray 6–8 weeks post-injury. Its presence indicates intact vascularity (excludes AVN). * **Blood Supply:** Primarily from the **Artery of the Tarsal Canal** (branch of the posterior tibial artery). * **Most common site of fracture:** Talar Neck. * **Aviator’s Astragalus:** Historical term for talar fractures caused by high-energy dorsiflexion.

Question 866: Which of the following radiographic views is NOT important in the assessment of a scaphoid fracture?

A. Anteroposterior (AP)
B. Lateral
C. Oblique
D. Cone view (Correct Answer)

Explanation: **Explanation:** The scaphoid is the most commonly fractured carpal bone, and its complex anatomy requires a specific "Scaphoid Series" for accurate diagnosis. **Why "Cone View" is the correct answer:** A **Cone view** is a specialized radiographic technique used to improve detail in a localized area (often used in dental imaging or for specific skull/sinus pathologies) by narrowing the X-ray beam. It is **not** a standard or recognized view for evaluating carpal fractures. In the context of the wrist, it provides no diagnostic advantage over standard orthopedic views. **Analysis of Incorrect Options:** * **Anteroposterior (AP):** A standard view to assess general carpal alignment and identify transverse fractures. * **Lateral:** Essential for evaluating the "spilled teacup" sign (lunate dislocation) and checking for dorsal/palmar displacement or angulation (humpback deformity) of the scaphoid. * **Oblique (usually 45°):** This view shifts the other carpal bones out of the way, providing a clearer profile of the scaphoid body. * **Note on the "Scaphoid View":** The most critical view (not listed above but often tested) is the **PA view with Ulnar Deviation**. This maneuvers the scaphoid out of its foreshortened position, placing it parallel to the film to better visualize the waist. **Clinical Pearls for NEET-PG:** * **Blood Supply:** The scaphoid receives its blood supply distally from the radial artery. Therefore, **proximal pole fractures** have the highest risk of **Avascular Necrosis (AVN)** and non-union. * **Clinical Sign:** Tenderness in the **Anatomical Snuffbox** is the most sensitive clinical finding. * **Management:** If X-rays are negative but clinical suspicion is high, the wrist should be immobilized in a **Thumb Spica cast** and re-imaged in 10–14 days. MRI is the gold standard for early detection.

Question 867: A K-nail works on the principle of which type of fixation?

A. One-point fixation
B. Two-point fixation
C. Three-point fixation (Correct Answer)
D. Four-point fixation

Explanation: ### Explanation The **Kuntscher nail (K-nail)** is a classic intramedullary device used primarily for fractures of the femoral shaft. Its design and function are based on the mechanical principle of **Three-point fixation**. **1. Why Three-point fixation is correct:** The K-nail has a cloverleaf cross-section, which provides some rotational stability, but its primary stability comes from the "elastic impingement" within the medullary canal. When inserted, the nail makes contact with the bone at three specific points: * The proximal entry point (near the greater trochanter). * The point of maximum curvature/narrowest part of the canal (the isthmus). * The distal end of the nail within the cancellous bone of the distal femur. This creates a stable internal splint by exerting opposing forces at these three points, preventing angular deformity. **2. Analysis of Incorrect Options:** * **One-point and Two-point fixation:** These are inherently unstable. A single point of contact acts as a pivot, and two points act as a hinge, allowing for significant angulation and displacement. * **Four-point fixation:** While some modern locking nails or complex external fixators may distribute stress across more points, the classic K-nail is specifically defined by the three-point contact required to stabilize a long bone fracture. **3. Clinical Pearls for NEET-PG:** * **Cross-section:** The K-nail is **cloverleaf-shaped**, which allows for flexibility and provides resistance against rotation (though less than modern locked nails). * **Type of Splint:** It is considered an **internal splint** (not a compression device). * **Indication:** It is best suited for **transverse or short oblique fractures** of the middle third (isthmus) of the femur. * **Limitation:** It is a **non-locking nail**. Therefore, it provides poor stability for comminuted or very proximal/distal fractures, where "telescoping" or rotation can occur. Modern practice has largely replaced K-nails with **Interlocking Intramedullary Nails**.

Question 868: Which of the following is a factor contributing to fat embolism in a patient with major trauma?

A. Mobility of the fractured bone (Correct Answer)
B. Hypovolemic shock
C. Respiratory failure
D. All of the above

Explanation: ### Explanation **Fat Embolism Syndrome (FES)** typically occurs following fractures of long bones (like the femur) or the pelvis. The pathophysiology is explained by two main theories: the **Mechanical Theory** and the **Biochemical Theory**. **Why Option A is Correct:** According to the **Mechanical Theory**, trauma causes the rupture of small blood vessels (sinusoids) in the bone marrow. Increased intramedullary pressure forces fat globules from the marrow into these torn vessels. **Mobility of the fractured bone** acts as a "pump," repeatedly forcing marrow fat into the systemic circulation. This is why early stabilization and rigid fixation of fractures (e.g., intramedullary nailing or plating) significantly reduce the incidence of fat embolism. **Why Options B and C are Incorrect:** * **Hypovolemic shock (B):** While shock often co-exists with major trauma and can worsen the prognosis of FES by reducing pulmonary perfusion, it is a *complication* or an *associated state*, not a direct causative factor for the release of fat into the bloodstream. * **Respiratory failure (C):** This is a **clinical manifestation** (part of Gurd’s criteria) of fat embolism, not a contributing factor. It occurs due to fat globules obstructing pulmonary capillaries and the subsequent chemical pneumonitis caused by free fatty acids. --- ### High-Yield Clinical Pearls for NEET-PG: * **Classic Triad:** Hypoxemia (Respiratory distress), Neurological abnormalities (Confusion/Seizures), and **Petechial rash** (typically over the chest, axilla, and conjunctiva). * **Gurd’s Criteria:** Used for diagnosis. The petechial rash is the most pathognomonic sign but appears in only 20-50% of cases. * **Snowstorm Appearance:** The characteristic finding on a Chest X-ray (diffuse bilateral pulmonary infiltrates). * **Management:** Primarily **supportive** (Oxygenation/Ventilation). Early splintage/fixation of fractures is the most effective preventive measure.

Question 869: What is an Ator fracture?

A. Fracture of the neck of the talus (Correct Answer)
B. Fracture of the scaphoid
C. Fracture of the calcaneum
D. Fracture of the 5th metatarsal

Explanation: **Explanation:** **Aviator’s Fracture (Ator Fracture)** refers to a fracture of the **neck of the talus**. The term originated during World War I when pilots would crash-land; the sudden forceful dorsiflexion of the foot against the rudder pedal caused the neck of the talus to be driven against the anterior edge of the distal tibia, leading to a fracture. **Why the correct answer is right:** * **Option A:** The talus neck is the most common site for talar fractures. Because the talus has a retrograde blood supply (entering mainly through the neck and distal body), fractures here carry a high risk of **Avascular Necrosis (AVN)** of the talar body. **Why the incorrect options are wrong:** * **Option B (Scaphoid):** While also prone to AVN, scaphoid fractures are typically caused by a fall on an outstretched hand (FOOSH), not dorsiflexion of the foot. * **Option C (Calcaneum):** Known as "Lover’s Fracture" or "Don Juan Fracture," usually caused by a fall from a height onto the heels. * **Option D (5th Metatarsal):** Fractures here are classified as Jones fractures (base of the 5th metatarsal) or Dancer’s fractures (avulsion of the styloid process). **Clinical Pearls for NEET-PG:** 1. **Hawkins Classification:** Used to grade talar neck fractures and predict the risk of AVN (Type I to IV). 2. **Hawkins Sign:** A subcortical radiolucent line seen on X-ray 6–8 weeks post-injury, indicating intact vascularity (a good prognostic sign). 3. **Blood Supply:** The **Artery of the Tarsal Canal** (branch of the posterior tibial artery) is the most important vessel supplying the body of the talus.

Question 870: Regarding Sudeck's osteodystrophy, all are true except?

A. Burning pain
B. Stiffness and swelling
C. Erythematous and cyanotic discoloration
D. Self-limiting and good prognosis (Correct Answer)

Explanation: **Explanation:** Sudeck’s osteodystrophy, also known as **Complex Regional Pain Syndrome (CRPS) Type 1**, is a post-traumatic reflex sympathetic dystrophy characterized by autonomic dysfunction. **Why Option D is the correct answer:** Contrary to being self-limiting, Sudeck’s osteodystrophy often follows a **chronic, progressive course** and has a **guarded prognosis**. If not treated early with aggressive physiotherapy and pain management, it can lead to permanent joint contractures, muscle atrophy, and severe functional disability. It is notoriously difficult to treat once established. **Analysis of Incorrect Options:** * **Option A (Burning pain):** This is the hallmark symptom. The pain is typically "out of proportion" to the initial injury and has a distinct neuropathic (burning) quality. * **Option B (Stiffness and swelling):** Vasomotor instability leads to exudation, causing soft tissue swelling. This eventually results in periarticular fibrosis and significant joint stiffness. * **Option C (Erythematous and cyanotic discoloration):** In the early (acute) stage, the limb is often red (erythematous) and warm. As it progresses to the dystrophic stage, it becomes cold, pale, or cyanotic due to vasoconstriction. **NEET-PG High-Yield Pearls:** * **X-ray finding:** Classic "patchy" or "moth-eaten" osteoporosis (sudden demineralization) of the distal bones. * **Common trigger:** Often follows Colles’ fracture or tight plaster casts. * **Clinical Stages:** 1. Acute (Hyperemic), 2. Dystrophic (Ischemic), 3. Atrophic (Final stage with contractures). * **Management:** The most important preventive and therapeutic measure is **active mobilization** and physiotherapy. Sympathetic blocks (e.g., Stellate ganglion block) may be used in refractory cases.

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Open Fractures

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Fractures in Children

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Fracture Complications

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