Trauma Practice Questions

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

Mangled extremity severity (MES) score. **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.

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

Hyperextension. **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.

Q: 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?

Immediate application of a hip spica cast. **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 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.

Q: The most serious complication of a pelvic fracture is:

Hypovolemic shock. ### 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).

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

Supracondylar fracture of the humerus. **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.

Q: What is the most common type of shoulder dislocation?

Subcoracoid. **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).

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

Eyelet wiring. **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.

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

Subcapital. **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.

Question 1

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

Accepted Answer

Mangled extremity severity (MES) score

Answer

Revised trauma score

Answer

Injury severity score

Answer

Abbreviated injury score

Question 2

A Hoffa fracture is defined as:

Accepted Answer

Coronal fracture of the posterior part of the femoral condyles

Answer

Stellate patella fracture

Answer

Metaphyseo-diaphyseal dissociation of the proximal tibia

Answer

Medial collateral ligament avulsion from the femur

Question 3

Tinel sign is indicative of?

Accepted Answer

Axon degeneration

Answer

Axonal conduction

Answer

Diffuse axonal injury

Answer

Muscle ischemia

Question 4

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

Accepted Answer

Hyperextension

Answer

Hyperflexion

Answer

Rotation

Answer

Sideward traction

Question 5

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?

Accepted Answer

Immediate application of a hip spica cast

Answer

Skeletal traction

Answer

Skeletal traction for 2 weeks followed by application of a hip spica cast

Answer

External skeletal fixation

Question 6

The most serious complication of a pelvic fracture is:

Accepted Answer

Hypovolemic shock

Answer

Rupture of the urinary bladder

Answer

Neurogenic shock

Answer

Malunion

Question 7

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

Accepted Answer

Supracondylar fracture of the humerus

Answer

Dislocation of the shoulder

Answer

Colles' fracture

Answer

Fracture of the clavicle

Question 8

What is the most common type of shoulder dislocation?

Accepted Answer

Subcoracoid

Answer

Subglenoid

Answer

Posterior

Answer

Subclavicular

Question 9

In osteosynthesis, which of the following is NOT used?

Accepted Answer

Eyelet wiring

Answer

Lag screw

Answer

Wires

Answer

Clamp bone plate

Question 10

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

Accepted Answer

Subcapital

Answer

Transcervical

Answer

Trochanteric

Answer

Basal

Trauma — MCQs

Trauma — MCQs

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