Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 41: Which of the following scores evaluates the chances of amputation in a traumatized limb?

A. Revised trauma score
B. Injury severity score
C. Abbreviated injury score
D. Mangled extremity severity (MES) score (Correct Answer)

Explanation: **Explanation:** The **Mangled Extremity Severity Score (MESS)** is a clinical scoring system specifically designed to help surgeons decide between limb salvage and primary amputation in cases of high-energy lower-limb trauma. It is based on four objective criteria: 1. **Skeletal/Soft tissue injury:** Extent of bone and muscle damage. 2. **Limb Ischemia:** Presence and duration of reduced blood flow (the most critical factor). 3. **Shock:** Presence of persistent hypotension. 4. **Age:** Patient’s physiological reserve. A score of **7 or higher** is highly predictive of the need for amputation, while a score of <7 suggests limb salvage may be successful. **Analysis of Incorrect Options:** * **A. Revised Trauma Score (RTS):** A physiological scoring system used in the ER to determine prognosis and triage. It uses the Glasgow Coma Scale (GCS), Systolic Blood Pressure, and Respiratory Rate. * **B. Injury Severity Score (ISS):** An anatomical scoring system that provides an overall score for patients with multiple injuries. It is calculated as the sum of the squares of the highest AIS scores in the three most severely injured body regions. * **C. Abbreviated Injury Score (AIS):** An anatomical-based global severity scoring system that classifies each injury by body region on a scale of 1 (minor) to 6 (unsurvivable). **High-Yield Clinical Pearls for NEET-PG:** * **MESS** is the most commonly asked score for limb salvage, but others include the NISSSA and PSI (Predictive Salvage Index). * **Ischemia** is the most heavily weighted component in the MESS; if ischemia lasts >6 hours, the points are doubled. * **Gustilo-Anderson Classification** is used to grade open fractures, but unlike MESS, it does not provide a definitive "cut-off" for amputation.

Question 42: A Hoffa fracture is defined as:

A. Stellate patella fracture
B. Metaphyseo-diaphyseal dissociation of the proximal tibia
C. Medial collateral ligament avulsion from the femur
D. Coronal fracture of the posterior part of the femoral condyles (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Coronal fracture of the posterior part of the femoral condyles** A **Hoffa fracture** is an intra-articular, **coronal plane fracture** of the distal femoral condyle. It typically involves the posterior aspect of the condyle. The lateral condyle is more frequently affected than the medial condyle. This injury is usually the result of high-energy trauma (e.g., motor vehicle accidents) where an axial load is applied to a flexed knee, leading to tangential shear forces. Because these fractures are intra-articular and often unstable, they generally require open reduction and internal fixation (ORIF) with headless compression screws. **Analysis of Incorrect Options:** * **Option A:** A stellate patella fracture refers to a comminuted fracture of the patella where the bone fragments radiate from a central point, usually due to direct trauma. * **Option B:** Metaphyseo-diaphyseal dissociation of the proximal tibia describes a complex tibial plateau fracture (often Schatzker Type VI), not a coronal femoral fracture. * **Option C:** Medial collateral ligament (MCL) avulsion from the femur is a soft tissue injury or a "Stieda fracture" (if a bony fragment is involved), but it is not a Hoffa fracture. **High-Yield Clinical Pearls for NEET-PG:** * **Classification:** It is classified as **Letenneur Type I, II, or III** based on the location of the fracture line relative to the posterior cortex. * **Radiology:** These fractures are notoriously difficult to see on standard AP X-rays because they are hidden by the intact anterior part of the condyle. A **CT scan** is the gold standard for diagnosis. * **AO Classification:** It falls under **33-B3** (Partial articular fracture of the distal femur, coronal plane). * **Associated Injury:** Always look for associated cruciate ligament injuries or meniscal tears.

Question 43: Tinel sign is indicative of?

A. Axonal conduction
B. Diffuse axonal injury
C. Axon degeneration (Correct Answer)
D. Muscle ischemia

Explanation: **Explanation:** **Tinel’s Sign** (or the Hoffmann-Tinel sign) is a clinical indicator of **nerve regeneration** following an injury. When a regenerating nerve fiber is percussed, it produces a "pins and needles" sensation (paresthesia) in the distal distribution of the nerve. 1. **Why "Axon Degeneration" is the correct answer:** Following a nerve injury (like neurotmesis or axonotmesis), the distal segment undergoes **Wallerian degeneration**. As the nerve begins to heal, new unmyelinated axonal sprouts (the "regenerating unit") grow from the proximal stump. These immature, regenerating axons are **hypersensitive to mechanical stimulation**. A positive Tinel sign indicates that axonal regeneration is occurring at the site of percussion. Therefore, it is a marker of the recovery process following axonal degeneration. 2. **Why other options are incorrect:** * **Axonal conduction:** This refers to normal physiological nerve impulses. Tinel’s sign is a pathological response of regenerating sprouts, not a sign of normal conduction. * **Diffuse axonal injury (DAI):** This is a specific type of traumatic brain injury involving shearing of white matter tracts; it is unrelated to peripheral nerve percussion signs. * **Muscle ischemia:** This typically presents with pain, pallor, and pulselessness (e.g., Compartment Syndrome), not paresthesia triggered by nerve percussion. **High-Yield Clinical Pearls for NEET-PG:** * **The "Advance" of Tinel’s:** In a recovering nerve, the point of hypersensitivity moves distally over time (approx. **1 mm/day**). This is used to track the rate of nerve regeneration. * **Prognostic Value:** A "distally progressing" Tinel sign is a good prognostic indicator. If the sign remains fixed at the site of injury, it suggests a **neuroma** or failure of regeneration. * **Phalen’s Test:** Often confused with Tinel’s; Phalen’s is specifically used for Carpal Tunnel Syndrome (median nerve compression).

Question 44: Whiplash injury of the spine is primarily due to which of the following mechanisms?

A. Hyperflexion
B. Hyperextension (Correct Answer)
C. Rotation
D. Sideward traction

Explanation: **Explanation:** **1. Why Hyperextension is Correct:** Whiplash injury, also known as a cervical acceleration-deceleration (CAD) injury, most commonly occurs during rear-end motor vehicle collisions. When a vehicle is struck from behind, the occupant's body is accelerated forward, but the head lags behind due to inertia. This results in a sudden, forceful **hyperextension** of the cervical spine. This motion stretches the anterior longitudinal ligament and compresses the posterior elements (facet joints and intervertebral discs), leading to the characteristic pain and stiffness. While a secondary "rebound" flexion occurs, the primary pathological insult is the initial hyperextension. **2. Why Other Options are Incorrect:** * **Hyperflexion:** While flexion occurs as a secondary recoil in whiplash, it is not the primary mechanism. Pure hyperflexion injuries are more commonly associated with "clay-shoveler’s fractures" or wedge fractures of the vertebral bodies. * **Rotation:** Rotational forces usually lead to unilateral facet dislocations or rotatory subluxation (e.g., Grisel’s syndrome). While rotation can complicate a whiplash injury, it is not the defining mechanism. * **Sideward Traction:** This mechanism is associated with brachial plexus injuries (like Erb’s palsy) rather than spinal whiplash. **3. NEET-PG Clinical Pearls:** * **Quebec Classification:** Used to grade the severity of Whiplash-Associated Disorders (WAD). * **Radiology:** X-rays are often normal, but the most common finding is the **loss of normal cervical lordosis** due to paravertebral muscle spasms. * **WAD Grade II:** Includes musculoskeletal signs (decreased range of motion and point tenderness). * **Management:** Early mobilization and NSAIDs are preferred over prolonged immobilization with a hard collar.

Question 45: A 4-year-old girl sustained an isolated, closed, diaphyseal fracture of her left femur. The fracture is transverse with approximately 1.5 cm of shortening. What is the most appropriate definitive management of this fracture?

A. Skeletal traction
B. Immediate application of a hip spica cast (Correct Answer)
C. Skeletal traction for 2 weeks followed by application of a hip spica cast
D. External skeletal fixation

Explanation: **Explanation:** The management of pediatric femoral shaft fractures is primarily determined by the **age of the patient** and the **amount of shortening**. **1. Why Option B is Correct:** For children aged **6 months to 5 years**, the gold standard treatment for a closed diaphyseal femur fracture with less than 2 cm of shortening is **Immediate Hip Spica casting**. In this age group, the periosteum is thick and osteogenic potential is high, leading to rapid healing. A shortening of 1.5 cm is acceptable because "overgrowth" often occurs in pediatric femur fractures due to hypervascularity during the healing process (typically 1–2 cm over the following year). **2. Why the other options are incorrect:** * **Option A & C:** Skeletal traction (with or without subsequent casting) was historically common but is now reserved for cases where skin integrity is compromised or if there is excessive shortening (>2 cm) that cannot be maintained by a cast alone. It involves prolonged hospitalization and increased morbidity. * **Option D:** External fixation is generally reserved for open fractures, fractures with severe soft tissue injury, or polytrauma cases ("damage control orthopaedics"). It carries a risk of pin-tract infections and refracture after removal. **Clinical Pearls for NEET-PG:** * **Age <6 months:** Pavlik harness or Splinting. * **Age 6 months – 5 years:** Immediate Hip Spica (if shortening <2 cm). * **Age 5 years – 11 years:** Flexible Intramedullary Nails (Elastic Stable Intramedullary Nailing - ESIN/TENS). * **Age >12 years (or >50kg):** Lateral entry Rigid Intramedullary Nail. * **Acceptable shortening:** Up to 2 cm is acceptable in children under 10 due to the compensatory overgrowth phenomenon.

Question 46: The most serious complication of a pelvic fracture is:

A. Rupture of the urinary bladder
B. Neurogenic shock
C. Hypovolemic shock (Correct Answer)
D. Malunion

Explanation: ### Explanation **Correct Answer: C. Hypovolemic shock** **Why it is correct:** Pelvic fractures, particularly high-energy "open book" or unstable fractures, are associated with massive internal hemorrhage. The pelvis is a highly vascular area containing the **presacral venous plexus** and the **internal iliac arteries**. A fracture can increase the pelvic volume significantly, allowing for the sequestration of up to 4 liters of blood (nearly the entire circulating volume) within the retroperitoneal space. **Hemorrhagic (hypovolemic) shock** is the leading cause of early mortality in these patients, making it the most serious and life-threatening complication. **Why the other options are incorrect:** * **A. Rupture of the urinary bladder:** While urogenital injuries (bladder or urethral rupture) are common in pelvic trauma, they are rarely immediately life-threatening compared to massive hemorrhage. * **B. Neurogenic shock:** This typically occurs in spinal cord injuries due to loss of sympathetic tone. While pelvic fractures can cause nerve root injuries (e.g., sacral plexus), they do not typically cause neurogenic shock. * **D. Malunion:** This is a late/delayed complication. While it leads to chronic pain and gait abnormalities, it does not pose an immediate threat to the patient's life. **High-Yield Clinical Pearls for NEET-PG:** * **Source of Bleeding:** 80–90% of hemorrhage in pelvic fractures is **venous** (Presacral plexus), while 10–20% is arterial (Internal iliac artery branches, most commonly the **Superior Gluteal Artery**). * **Initial Management:** The first step in stabilizing an unstable pelvic fracture in the ER is the application of a **Pelvic Binder** (at the level of the greater trochanters) to decrease pelvic volume and provide tamponade. * **Associated Injury:** The most common site of urethral injury in pelvic fractures is the **membranous urethra** (at the puboprostatic junction).

Question 47: What is the most common injury in a 7-year-old child resulting from a fall on an outstretched hand?

A. Dislocation of the shoulder
B. Colles' fracture
C. Fracture of the clavicle
D. Supracondylar fracture of the humerus (Correct Answer)

Explanation: **Explanation:** The correct answer is **Supracondylar fracture of the humerus**. In children aged 5–10 years, the supracondylar area is the weakest part of the humerus due to active remodeling and a thin cortex. A fall on an outstretched hand (FOOSH) with the elbow in extension forces the olecranon into the supratrochlear fossa, leading to this fracture. It is the most common fracture around the elbow in the pediatric population. **Analysis of Incorrect Options:** * **A. Dislocation of the shoulder:** This is rare in children because the joint capsule and ligaments are stronger than the surrounding bone/physeal plates. Shoulder dislocations are more common in young adults and athletes. * **B. Colles' fracture:** While this is a classic FOOSH injury, it is primarily seen in the elderly (osteoporotic bone) or post-menopausal women. In children, a FOOSH more commonly results in a distal radial physeal injury or a "greenstick" fracture rather than a true Colles'. * **C. Fracture of the clavicle:** This is the most common fracture in **newborns** (birth trauma) and overall childhood, but specifically for a FOOSH injury in the 5–10 year age group, supracondylar fractures are the classic "exam-favorite" presentation. **High-Yield Clinical Pearls for NEET-PG:** * **Gartland Classification:** Used to grade supracondylar fractures (Type I: Undisplaced; Type II: Displaced with intact posterior cortex; Type III: Completely displaced). * **Complications:** The most serious acute complication is **Volkmann’s Ischemic Contracture** (due to brachial artery injury or compartment syndrome). * **Deformity:** Malunion often leads to **Cubitus Varus** (Gunstock deformity). * **Neurological Injury:** The **Anterior Interosseous Nerve (AIN)** is the most common nerve injured in extension-type fractures.

Question 48: What is the most common type of shoulder dislocation?

A. Subcoracoid (Correct Answer)
B. Subglenoid
C. Posterior
D. Subclavicular

Explanation: **Explanation:** Shoulder dislocations are the most common large-joint dislocations in the body, with **Anterior Dislocation** accounting for approximately **95-97%** of all cases. **1. Why Subcoracoid is Correct:** Anterior dislocations are further classified based on the final resting position of the humeral head. The **Subcoracoid** position is the most common subtype. In this variety, the humeral head is displaced anteriorly and superiorly, coming to rest beneath the coracoid process. This usually occurs due to a combination of abduction, extension, and external rotation forces. **2. Analysis of Other Options:** * **Subglenoid (Option B):** This is the second most common subtype of anterior dislocation. The humeral head rests inferior to the glenoid fossa. It is often associated with greater tuberosity fractures. * **Posterior (Option C):** These account for only 2–5% of cases. They are classically associated with **seizures, electric shocks**, or direct trauma. They are frequently missed on routine AP X-rays (look for the "Light bulb sign"). * **Subclavicular (Option D):** This is a rare subtype of anterior dislocation where the humeral head is pushed further medially, resting medial to the coracoid process and inferior to the clavicle. **Clinical Pearls for NEET-PG:** * **Most common nerve injured:** Axillary nerve (tested via sensation over the "Regimental Badge" area). * **Bankart Lesion:** Avulsion of the anteroinferior glenoid labrum (most common pathological lesion). * **Hill-Sachs Lesion:** Compression fracture of the posterolateral aspect of the humeral head. * **Kocher’s Method:** A classic reduction technique (Mnemonic: **TEAM** – Traction, External rotation, Adduction, Medial rotation).

Question 49: In osteosynthesis, which of the following is NOT used?

A. Lag screw
B. Wires
C. Clamp bone plate
D. Eyelet wiring (Correct Answer)

Explanation: **Explanation:** **Osteosynthesis** refers to the surgical reduction and internal fixation of a bone fracture using mechanical devices (implants) to achieve stable fixation and promote healing. **Why Option D is Correct:** **Eyelet wiring** (also known as Ivy loops) is a technique used in **Maxillofacial surgery** for **Intermaxillary Fixation (IMF)**. It involves wiring the upper and lower teeth together to stabilize the jaw. While it stabilizes a fracture site, it is a form of external/dental stabilization rather than osteosynthesis, which specifically refers to the internal fixation of the bone fragments themselves using plates, screws, or nails. **Why Other Options are Incorrect:** * **A. Lag Screw:** This is a fundamental tool in osteosynthesis. It produces **interfragmentary compression** by gliding through the near cortex and engaging only the far cortex, squeezing the bone fragments together. * **B. Wires:** Cerclage wires or K-wires (Kirschner wires) are frequently used in osteosynthesis, especially in tension band wiring (e.g., patella or olecranon fractures) or to hold fragments in place temporarily. * **C. Clamp Bone Plate:** Various types of plates (Dynamic Compression Plates, Locking Plates) are the hallmark of internal fixation. They "clamp" or bridge the fracture to provide rigid stability. **NEET-PG High-Yield Pearls:** * **Gold Standard for Osteosynthesis:** The **AO (Arbeitsgemeinschaft für Osteosynthesefragen)** principles focus on anatomical reduction, stable fixation, preservation of blood supply, and early mobilization. * **Primary Bone Healing:** Occurs only with absolute stability (e.g., compression plating/lag screws) without callus formation. * **Secondary Bone Healing:** Occurs with relative stability (e.g., intramedullary nailing or casts) and involves callus formation.

Question 50: What is the most common site for avascular necrosis of the femur?

A. Subcapital (Correct Answer)
B. Transcervical
C. Trochanteric
D. Basal

Explanation: **Explanation:** The risk of **Avascular Necrosis (AVN)** in femoral neck fractures is primarily determined by the proximity of the fracture line to the femoral head and the degree of disruption to the blood supply. **1. Why Subcapital is Correct:** The femoral head receives its primary blood supply from the **retinacular vessels** (branches of the medial circumflex femoral artery). These vessels run along the neck of the femur to reach the head. In a **subcapital fracture**, the fracture line occurs immediately below the articular surface of the head. This location is most likely to completely sever the retinacular vessels, leaving the head dependent solely on the meager supply from the *ligamentum teres*. Consequently, subcapital fractures have the highest incidence of AVN (up to 30-40%). **2. Analysis of Incorrect Options:** * **Transcervical:** The fracture occurs through the mid-portion of the neck. While the risk of AVN is high, it is statistically lower than subcapital fractures because some distal retinacular branches may remain intact. * **Basal (Basocervical):** These occur at the junction of the neck and the trochanteric region. Being further from the head, the vascular compromise is less severe. * **Trochanteric:** These are **extracapsular** fractures. Because they occur distal to the insertion of the joint capsule where the blood supply enters, the risk of AVN is negligible. **Clinical Pearls for NEET-PG:** * **Garden’s Classification:** Used for subcapital fractures; Stage III and IV have the highest risk of AVN and non-union. * **Pauwels' Classification:** Based on the angle of the fracture line; higher angles (Type III) indicate greater instability and higher risk of complications. * **Management:** In elderly patients with displaced subcapital fractures, **Arthroplasty** (Hemi or Total) is preferred over internal fixation due to the high risk of AVN.

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Principles of Fracture Management

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Upper Limb Fractures

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Lower Limb Fractures

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Spinal Trauma

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Pelvic and Acetabular Fractures

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Open Fractures

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Fractures in Children

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Fracture Complications

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Nonunion and Malunion

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Polytrauma Management

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Joint Dislocations

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Soft Tissue Injuries

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Trauma — MCQs

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