Trauma Practice Questions

Q: All of the following are synonymous with radial styloid fracture except?

March fracture. **Explanation:** The correct answer is **March fracture** because it refers to a stress fracture of the metatarsals (most commonly the 2nd or 3rd), not the radial styloid. **1. Why March Fracture is the Correct Answer:** A March fracture is a fatigue/stress fracture occurring due to repetitive microtrauma, classically seen in military recruits or long-distance hikers. It typically involves the neck of the **second metatarsal**. It has no anatomical or clinical relationship with the wrist or the radius. **2. Why the other options are synonymous with Radial Styloid Fracture:** * **Chauffeur’s Fracture:** This is the most common synonym. In the early 20th century, when starting a car required a hand crank, the engine could "kick back," causing the crank handle to strike the lateral aspect of the wrist, fracturing the radial styloid. * **Hutchinson Fracture:** Named after Sir Jonathan Hutchinson, who first described this intra-articular fracture of the radial styloid. * **Backfire Fracture:** Another historical term derived from the same mechanism as the Chauffeur’s fracture (the "backfiring" of the engine crank). **Clinical Pearls for NEET-PG:** * **Mechanism:** Usually caused by a direct blow to the radial side of the wrist or forced ulnar deviation and supination. * **Classification:** It is an **intra-articular fracture**. * **Associated Injuries:** Often associated with **scapholunate dissociation** (Terry Thomas sign) or carpal dislocations. * **Treatment:** Undisplaced fractures are treated with a thumb spica cast; displaced fractures require **Percutaneous K-wire fixation** or ORIF to restore joint congruity.

Q: What is the characteristic position of the leg in a fracture of the neck of the femur?

External rotation deformity of less than 45 degrees. In a **fracture of the neck of the femur** (intracapsular fracture), the characteristic clinical presentation is a shortened limb with **external rotation deformity of less than 45 degrees**. ### Why is the correct answer B? The external rotation occurs because the powerful lateral rotator muscles (like the gluteus maximus and short rotators) act on the distal fragment, pulling it outward. However, the rotation is limited to **less than 45 degrees** because the **capsule of the hip joint** remains intact. The capsule acts as a mechanical tether, preventing the limb from rotating further. ### Why are the other options wrong? * **Options A & C (Internal Rotation):** These are incorrect because the vector of the muscles attached to the femur naturally pulls the limb into external, not internal, rotation. Internal rotation is typically seen in **posterior dislocations of the hip**. * **Option D (External Rotation > 45 degrees):** An external rotation of 60–90 degrees (where the lateral border of the foot touches the bed) is characteristic of **extracapsular fractures** (e.g., Intertrochanteric fractures). In these cases, the fracture is outside the capsule, so the capsular restraint is lost, allowing for more extreme rotation. ### NEET-PG High-Yield Pearls * **Intracapsular (Neck) Fracture:** Shortening is mild; External rotation is mild (<45°). * **Extracapsular (Trochanteric) Fracture:** Shortening is marked; External rotation is severe (up to 90°). * **Posterior Hip Dislocation:** The limb is **Adducted, Internally Rotated, and Flexed** (The "Dashboard Injury"). * **Anterior Hip Dislocation:** The limb is **Abducted and Externally Rotated**.

Q: A supraspinatus injury typically results in which of the following functional impairments?

Inability to abduct the arm. **Explanation:** The **Supraspinatus** is one of the four muscles of the rotator cuff (SITS: Supraspinatus, Infraspinatus, Teres minor, Subscapularis). Its primary function is to **initiate the first 0–15 degrees of abduction** at the glenohumeral joint and assist the deltoid in further abduction up to 90 degrees. Therefore, an injury or tear to the supraspinatus tendon leads to a significant inability to initiate or maintain abduction of the arm. **Analysis of Options:** * **A. Frozen Shoulder (Adhesive Capsulitis):** This is characterized by global restriction of both active and passive movements (especially external rotation) due to capsular thickening, not isolated muscle injury. * **B. Winging of the Scapula:** This occurs due to paralysis of the **Serratus Anterior** muscle (Long Thoracic Nerve injury) or, less commonly, the Trapezius (Spinal Accessory Nerve injury). * **D. Inability to adduct the arm:** Adduction is primarily performed by the Pectoralis major, Latissimus dorsi, and Teres major. Supraspinatus injury does not affect this movement. **Clinical Pearls for NEET-PG:** 1. **Drop Arm Test:** A positive test (inability to lower the arm slowly from 90°) is highly suggestive of a full-thickness supraspinatus tear. 2. **Empty Can (Jobe’s) Test:** Specifically used to isolate and test the supraspinatus. 3. **Codman’s Paradox:** Explains how the arm can be moved in different planes to achieve the same position; often tested in shoulder mechanics. 4. **Most Common Site of Tear:** The "Critical Zone" (Codman’s Point) near the insertion on the greater tuberosity, due to its relatively poor blood supply.

Q: A young male presented with dyspnea, bleeding, and petechial hemorrhage in the chest 2 days after sustaining a fracture of the shaft of the right femur. What is the most likely cause?

Fat embolism. ### Explanation **Correct Answer: B. Fat Embolism** The clinical presentation of **dyspnea**, **petechial rashes** (typically on the chest, axilla, and conjunctiva), and **neurological symptoms** following a long bone fracture (like the femur) is the classic triad of **Fat Embolism Syndrome (FES)**. * **Pathophysiology:** Mechanical trauma to the bone marrow releases fat globules into the venous circulation. These globules cause mechanical obstruction in the pulmonary capillaries and trigger a chemical inflammatory response (free fatty acid toxicity), leading to Acute Respiratory Distress Syndrome (ARDS). * **Timeline:** Symptoms typically appear **24–72 hours** after the injury (the "latent period"). **Why other options are incorrect:** * **A. Air Embolism:** Usually occurs due to iatrogenic causes (central line insertion, surgery) or penetrating chest trauma. It presents acutely, not after a 2-day delay. * **C. Pulmonary Thromboembolism (PTE):** While common in trauma patients, PTE usually occurs **1–2 weeks** post-injury due to deep vein thrombosis (DVT). It does not present with petechial hemorrhages. * **D. Amniotic Fluid Embolism:** This is an obstetric emergency occurring during labor or immediate postpartum; it is irrelevant to a male patient with a femur fracture. **High-Yield Clinical Pearls for NEET-PG:** * **Gurd’s Criteria:** Used for diagnosis. Major criteria include axillary/subconjunctival petechiae, hypoxemia ($PaO_2 < 60$ mmHg), and CNS depression. * **Snowstorm Appearance:** Characteristic finding on Chest X-ray (diffuse bilateral pulmonary infiltrates). * **Treatment:** Primarily **supportive** (oxygenation and stabilization of the fracture). Early internal fixation of long bone fractures significantly reduces the risk of FES. * **Most common site:** Femur shaft fracture.

Q: Calcaneum is most commonly associated with which fracture?

Vertebral fracture. **Explanation:** The correct answer is **Vertebral fracture**. This association is a classic example of a "Don Juan Syndrome" or "Lover’s Leap" injury. **1. Why Vertebral Fracture is Correct:** The mechanism of injury for a calcaneal fracture typically involves a high-energy axial load, such as falling from a height and landing on the heels. The force is transmitted proximally through the talus to the tibia, femur, and ultimately the axial skeleton. Approximately **10% of patients** with a calcaneal fracture will have a concomitant compression fracture of the lumbar spine (most commonly at the **L1 level**). This is why any patient presenting with a calcaneal fracture must undergo a thorough clinical and radiological evaluation of the spine. **2. Why Other Options are Incorrect:** * **Rib and Skull fractures:** These are typically associated with direct blunt trauma or high-velocity motor vehicle accidents rather than the specific axial loading mechanism seen in heel strikes. * **Fibula fracture:** While a fibular fracture can occur in complex lower limb trauma, it is not the "most commonly associated" systemic fracture linked specifically to the mechanism of calcaneal injury. **Clinical Pearls for NEET-PG:** * **Bilateral Calcaneal Fractures:** If one calcaneum is fractured, there is a high probability (approx. 10%) of the other side being fractured as well. * **Mondor’s Sign:** Ecchymosis extending to the sole of the foot is a pathognomonic clinical sign for calcaneal fracture. * **Bohler’s Angle:** Normal is 20°–40°. An angle <20° indicates a depressed calcaneal fracture. * **Gissane’s Angle:** Normal is 120°–145°. An increase suggests a fracture of the posterior facet.

Q: Open reduction is indicated in which of the following conditions?

Lateral condyle humerus fractures. **Explanation:** **Lateral condyle humerus fractures** are the correct answer because they are **intra-articular fractures** that are notoriously unstable. Due to the pull of the common extensor origin, these fractures often undergo displacement and rotation. Even a displacement of >2mm necessitates **Open Reduction and Internal Fixation (ORIF)** to ensure anatomical restoration of the joint surface and to prevent complications like non-union or cubitus valgus. **Why the other options are incorrect:** * **Clavicle fractures:** Most clavicle fractures (especially mid-shaft) are managed conservatively with a figure-of-eight bandage or a triangular sling. Surgery is reserved only for specific indications like neurovascular injury or skin tenting. * **Both bone forearm fractures in children:** Children have a thick periosteum and high remodeling potential. Most of these fractures are managed by **Closed Reduction and casting**. Surgery is usually reserved for older children or failed closed reductions. * **Supracondylar humerus fractures:** These are extra-articular. The standard of care for displaced fractures (Gartland Type II/III) is **Closed Reduction and Percutaneous Pinning (CRPP)**. Open reduction is only indicated if closed reduction fails or if there is an associated vascular injury. **High-Yield Clinical Pearls for NEET-PG:** * **Lateral Condyle Fracture:** Known as the "Fracture of Necessity" (requires surgery) and the "Milch Fracture." * **Complication:** If left untreated, it leads to **Non-union**, which causes **Cubitus Valgus** deformity, eventually leading to **Tardy Ulnar Nerve Palsy**. * **Absolute Indications for Open Reduction:** Intra-articular fractures (displaced), failed closed reduction, fractures with neurovascular compromise, and "unstable" fractures (e.g., femoral neck).

Q: What is the most troubling aspect of a Thomas splint?

Ring. The **Thomas splint** is a classic orthopedic device used primarily for the immobilization of femur fractures. The correct answer is the **Ring**, as it represents the most problematic component of the splint’s design. ### Why the Ring is the most troubling: The Thomas splint is a form of **skin traction** where the counter-traction is provided by the ring pressing against the **ischial tuberosity**. Because the ring must be snug to provide effective counter-traction, it frequently causes: * **Pressure Sores:** Constant pressure on the groin and ischial area leads to skin breakdown. * **Hygiene Issues:** The area is prone to soiling from urine and feces, increasing the risk of infection. * **Size Mismatch:** If the ring is too small, it causes excessive pressure; if too large, it slides up, losing effective counter-traction and potentially injuring the perineum. ### Why other options are incorrect: * **Side bars:** These provide the structural framework and are generally well-tolerated. They rarely cause direct complications unless they are bent or improperly sized. * **Gauze support:** These "slings" support the limb within the frame. While they must be adjusted to prevent sagging, they do not pose a significant clinical "trouble" compared to the ring. * **Traction attachment:** This is the mechanism (e.g., a W-shaped distal end) where the cord is tied. It is a functional component that rarely causes patient morbidity. ### NEET-PG High-Yield Pearls: * **Measurement:** To select the correct size, measure the **oblique circumference of the thigh** at the groin and **add 2 inches**. * **Indications:** Primarily used for fractures of the shaft of the femur and to transport patients with lower limb injuries. * **Modification:** The **Keller-Blake splint** is a modification with a "half-ring" to reduce the pressure complications associated with the full ring.

Question 1

All of the following are synonymous with radial styloid fracture except?

Accepted Answer

March fracture

Answer

Chauffer's fracture

Answer

Hutchinson fracture

Answer

Backfire fracture

Question 2

What is the characteristic position of the leg in a fracture of the neck of the femur?

Accepted Answer

External rotation deformity of less than 45 degrees

Answer

Internal rotation deformity of less than 45 degrees

Answer

Internal rotation deformity of more than 45 degrees

Answer

External rotation deformity of more than 45 degrees

Question 3

What is true about post-traumatic fat embolism syndrome?

Accepted Answer

Associated diabetes poses a risk.

Answer

Bradycardia occurs.

Answer

Systemic hypoxia may occur.

Answer

Fracture mobility is a risk factor.

Question 4

A supraspinatus injury typically results in which of the following functional impairments?

Accepted Answer

Inability to abduct the arm

Answer

Frozen shoulder

Answer

Winging of the scapula

Answer

Inability to adduct the arm

Question 5

A young male presented with dyspnea, bleeding, and petechial hemorrhage in the chest 2 days after sustaining a fracture of the shaft of the right femur. What is the most likely cause?

Accepted Answer

Fat embolism

Answer

Air embolism

Answer

Pulmonary thromboembolism

Answer

Amniotic fluid embolism

Question 6

Calcaneum is most commonly associated with which fracture?

Accepted Answer

Vertebral fracture

Answer

Rib fracture

Answer

Skull fracture

Answer

Fibula fracture

Question 7

Open reduction is indicated in which of the following conditions?

Accepted Answer

Lateral condyle humerus fractures

Answer

Clavicle fractures

Answer

Both bone forearm fractures in children

Answer

Supracondylar humerus fractures

Question 8

Recurrent dislocations are least commonly seen in which of the following joints?

Accepted Answer

Ankle

Answer

Hip

Answer

Shoulder

Answer

Patella

Question 9

A child has dye injected into an extremity. Subsequently, the child develops pain and swelling of the upper limb, paresthesias of the fingers, stretch pain, and normal peripheral pulses. What is the appropriate management?

Accepted Answer

Fasciotomy

Answer

Aspiration

Answer

Anti-inflammatory agents

Answer

Observation

Question 10

What is the most troubling aspect of a Thomas splint?

Accepted Answer

Ring

Answer

Side bars

Answer

Gauze support

Answer

Traction attachment

Trauma — MCQs

Trauma — MCQs

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