Trauma Practice Questions

Q: In fracture shaft of femur, which nail is commonly used for ORIF?

Kuntscher nail. **Explanation:** The **Kuntscher nail (K-nail)** is the correct answer as it was historically the gold standard and remains a classic textbook answer for the intramedullary nailing of femoral shaft fractures. It is a cloverleaf-shaped, hollow stainless steel nail that works on the principle of **"three-point fixation."** It is a non-locking nail, meaning it relies on endosteal friction to provide stability, making it most suitable for transverse or short oblique fractures of the mid-shaft. **Analysis of Incorrect Options:** * **Austin Moore Pin:** These are used for the internal fixation of **fractures of the neck of the femur**, particularly in elderly patients (though now largely replaced by cannulated screws or hemiarthroplasty). * **K-wire (Kirschner wire):** These are thin, flexible wires used for temporary fixation, stabilizing small bone fragments (like phalanges or distal radius), or as a guide for larger implants. They lack the structural rigidity required for a weight-bearing bone like the femur. * **Smith-Peterson (S-P) Nail:** This is a triflanged nail historically used for **intracapsular femoral neck fractures**. It has been largely superseded by the Dynamic Hip Screw (DHS). **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Today:** While the K-nail is the classic answer, the modern "Gold Standard" for femoral shaft fractures is the **Interlocking Intramedullary Nail**, which allows for rotational stability and can be used for comminuted fractures. * **Cloverleaf Cross-section:** The K-nail’s unique shape allows it to compress slightly during insertion and expand against the medullary canal for a snug fit. * **Ideal Site:** The K-nail is best suited for fractures in the **isthmus** (the narrowest part of the femoral canal).

Q: Open book and bucket handle injuries are seen in which anatomical region?

Pelvis. **Explanation:** The correct answer is **Pelvis**. These terms describe specific patterns of pelvic ring disruptions caused by high-energy trauma. 1. **Open Book Injury:** This occurs due to **Anteroposterior (AP) Compression** forces. It involves a disruption of the pubic symphysis (diastasis >2.5 cm) and tearing of the anterior sacroiliac (SI) ligaments. The pelvis "opens" like a book, significantly increasing the pelvic volume, which often leads to life-threatening retroperitoneal hemorrhage. 2. **Bucket Handle Injury:** This is a type of **Lateral Compression** injury. It involves a fracture of the pubic rami on one side and a fracture/dislocation of the SI joint on the *contralateral* (opposite) side. The fractured hemipelvis rotates superiorly and medially, resembling the movement of a bucket handle. **Why other options are incorrect:** * **Spine:** Spinal injuries are classified by mechanisms like flexion-distraction (Chance fractures) or burst fractures, but do not use these specific descriptors. * **Femur:** Femoral fractures are classified by location (neck, intertrochanteric, shaft) or morphology (transverse, spiral), not by "open book" mechanisms. * **Knee:** While the knee has a "bucket handle" tear, it refers specifically to a **meniscal injury**, not a bony fracture pattern. **High-Yield Clinical Pearls for NEET-PG:** * **Young-Burgess Classification:** The standard system for pelvic fractures based on mechanism (AP Compression, Lateral Compression, Vertical Shear). * **Initial Management:** The most critical step in an unstable open book fracture is applying a **Pelvic Binder** at the level of the greater trochanters to reduce pelvic volume and tamponade bleeding. * **Associated Injury:** Urethral and bladder injuries are highly associated with pelvic ring disruptions.

Q: The Judet and Lectournal classification is used for which type of fracture?

Acetabulum fracture. The **Judet and Letournel classification** is the gold standard system for classifying **acetabular fractures**. It is based on the anatomical concept of the "Two-Column Theory" proposed by Raymond Letournel. ### **Explanation of the Correct Answer** The acetabulum is viewed as an inverted 'Y' formed by two columns: * **Anterior Column:** Extends from the iliac crest to the pubic symphysis. * **Posterior Column:** Extends from the sciatic notch to the ischial tuberosity. The classification divides fractures into **5 Elementary patterns** (e.g., posterior wall, transverse) and **5 Associated patterns** (e.g., T-shaped, both columns). This system is crucial for surgical planning and determining the approach (Ilioinguinal vs. Kocher-Langenbeck). ### **Why Other Options are Incorrect** * **A. Supracondylar Humerus Fracture:** Commonly classified using the **Gartland Classification** (based on displacement). * **C. Shaft Femur Fracture:** Usually classified by the **Winquist and Hansen Classification** (based on comminution) or the AO/OTA system. * **D. Patella Fracture:** Classified based on morphology (transverse, stellate, vertical) or the **Descriptive Classification**. ### **High-Yield Clinical Pearls for NEET-PG** * **Radiology:** The classification requires three views (Judet Views): AP view of the pelvis, **Iliac oblique**, and **Obturator oblique**. * **Associated Injury:** Acetabular fractures are often associated with **posterior hip dislocation** (especially posterior wall fractures). * **Central Dislocation:** A fracture of the acetabular floor where the femoral head is driven medially is termed a central dislocation of the hip.

Q: Sectoral sign is positive in which of the following conditions?

Avascular necrosis of femur head. **Explanation:** The **Sectoral Sign** is a classic radiological feature of **Avascular Necrosis (AVN) of the femoral head**. It refers to the phenomenon where the necrotic segment of the femoral head appears relatively more radiopaque (denser) compared to the surrounding osteopenic bone. This occurs because the dead bone maintains its original density while the surrounding viable bone undergoes disuse atrophy and resorption, creating a "sector" of increased density, usually in the anterolateral weight-bearing portion. **Analysis of Options:** * **A. Avascular Necrosis (AVN):** Correct. The sectoral sign, along with the **"Crescent Sign"** (subchondral fracture), is a hallmark of Ficat and Arlet Stage II/III AVN. * **B. Osteoarthritis of Hip:** Characterized by joint space narrowing, subchondral sclerosis, and osteophytes. While sclerosis is present, it is usually diffuse along the joint line rather than a specific "sectoral" density. * **C. Protrusio Acetabuli:** This refers to the medial displacement of the femoral head beyond the ilioischial (Kohler’s) line. It is seen in rheumatoid arthritis and Paget’s disease, not characterized by sectoral density. * **D. Slipped Capital Femoral Epiphysis (SCFE):** This involves the displacement of the epiphysis postero-inferiorly. Key signs include **Trethowan’s sign** (Klein’s line not intersecting the epiphysis) and the **Steel sign** (metaphyseal blanching). **High-Yield Clinical Pearls for NEET-PG:** * **Most sensitive imaging for AVN:** MRI (shows the "Double Line Sign" on T2 images). * **Earliest X-ray sign of AVN:** Sclerosis/Sectoral sign (Stage II). * **Crescent Sign:** Indicates an impending articular collapse (Stage III). * **Commonest site for AVN:** Femoral head (due to retrograde blood supply via the medial circumflex femoral artery).

Q: Which of the following are the characteristic features of a fracture of the neck of the femur?

Shortening and lateral rotation. **Explanation:** The classic clinical presentation of a **fracture of the neck of the femur** (intracapsular fracture) is a limb that is **shortened and externally (laterally) rotated**. 1. **Shortening:** This occurs due to the proximal migration of the distal femoral fragment caused by the upward pull of the powerful hip muscles (rectus femoris, hamstrings, and adductors) which are no longer resisted by the intact femoral neck. 2. **Lateral Rotation:** The distal fragment rotates externally because the short external rotators of the hip are unopposed. Furthermore, the weight of the foot naturally tends to roll the limb outward once the structural integrity of the femoral neck is lost. **Analysis of Incorrect Options:** * **Options A, B, and D:** While flexion may occasionally be seen due to pain response, it is not a defining diagnostic feature of the fracture. **Abduction** is incorrect because the limb typically lies in a neutral or slightly adducted position. The combination of shortening and lateral rotation is the "pathognomonic" clinical sign tested in exams. **NEET-PG High-Yield Pearls:** * **Degree of Rotation:** In **Intracapsular** (Neck) fractures, lateral rotation is typically **45°** because the capsule limits further movement. In **Extracapsular** (Intertrochanteric) fractures, the rotation is more severe, often reaching **90°** (the foot touches the bed). * **Vascularity:** The main blood supply to the femoral head is the **Medial Circumflex Femoral Artery**. Fractures here carry a high risk of **Avascular Necrosis (AVN)** and non-union. * **Classification:** Garden’s Classification is used for femoral neck fractures, while Boyd and Griffin or Jensen’s is used for intertrochanteric fractures.

Q: A 36-year-old man sustained a soccer injury. What procedure needs to be performed urgently?

Manipulation to improve alignment. ***Manipulation to improve alignment*** - **Anterior shoulder dislocation** requires urgent **closed reduction** to restore glenohumeral joint alignment and prevent complications. - Delayed reduction increases risk of **muscle spasm**, **axillary nerve injury**, and **anterior circumflex humeral artery** compromise. *A CT scan* - While useful for detecting **associated fractures**, CT is not the urgent priority in obvious dislocation cases. - **Clinical examination** and **plain radiographs** are sufficient for diagnosis; reduction should not be delayed for advanced imaging. *Application of a cast to maintain alignment* - Casting without **prior reduction** would immobilize the shoulder in a **dislocated position**, causing permanent damage. - **Sling immobilization** is appropriate only **after successful reduction** to allow soft tissue healing. *Internal fixation* - **Surgical fixation** is reserved for **recurrent dislocations**, **associated fractures**, or **failed closed reduction**. - Initial management of **acute anterior dislocation** is always **closed reduction** unless contraindicated by fractures.

Q: A 32-year-old male with a history of recurrent posterior dislocation of the shoulder joint. Which aspect of the humeral head is likely to show the lesion?

Anteromedial. ### Explanation The correct answer is **A. Anteromedial**. #### 1. The Underlying Concept: Reverse Hill-Sachs Lesion In a **posterior dislocation** of the shoulder, the humeral head is forced posteriorly against the posterior rim of the glenoid labrum. As the humeral head impacts the sharp glenoid rim, an impaction fracture occurs on the **anteromedial** aspect of the humeral head. This specific injury is known as a **Reverse Hill-Sachs lesion**. #### 2. Analysis of Options * **Anteromedial (Correct):** This is the site of impaction during posterior dislocation. The anterior part of the humeral head hits the posterior part of the glenoid. * **Posterolateral (Incorrect):** This is the site of a classic **Hill-Sachs lesion**, which occurs during **anterior shoulder dislocation** (the most common type). Here, the posterolateral humeral head impacts the anterior glenoid rim. * **Anterolateral & Posteromedial (Incorrect):** These anatomical locations do not correspond to the standard impaction points during common shoulder dislocations. #### 3. High-Yield Clinical Pearls for NEET-PG * **Posterior Dislocation:** Often associated with **seizures** or **electric shocks** (due to the strength of internal rotators). * **Clinical Sign:** The patient presents with the arm fixed in **adduction and internal rotation**. External rotation is impossible. * **Radiology:** Look for the **"Light Bulb Sign"** on AP view (the humeral head appears rounded due to internal rotation) and the **"Rim Sign"** (increased space between the glenoid and humeral head). * **Reverse Bankart Lesion:** This refers to the detachment of the **posterior-inferior** labrum, often seen alongside a Reverse Hill-Sachs lesion in recurrent posterior instability.

Q: A 32-year-old man sustains fractures of the right femur and tibia and the left humerus following a vehicular accident. The fractures are stabilized surgically. He remains in stable condition for 2 days, but then suddenly becomes severely dyspneic. Which of the following complications from his injuries is the most likely cause of his sudden respiratory difficulty?

Fat embolism. **Explanation:** The clinical presentation is classic for **Fat Embolism Syndrome (FES)**. This condition typically occurs following fractures of **long bones** (femur, tibia, humerus) or pelvic fractures. **1. Why Fat Embolism is correct:** Fat embolism occurs when fat globules from the bone marrow enter the systemic circulation following a fracture. There is typically a **latent period of 24–72 hours** after the injury (matching this patient's 2-day stable period). The "Classic Triad" of FES includes: * **Respiratory distress:** Sudden dyspnea, hypoxia, and tachypnea (the most common early sign). * **Neurological symptoms:** Confusion, agitation, or seizures. * **Petechial rash:** Typically found on the conjunctiva, neck, and axilla (pathognomonic but seen in only 20-50% of cases). **2. Why the other options are incorrect:** * **Cardiac Tamponade:** This presents acutely with Beck’s Triad (hypotension, JVP distension, muffled heart sounds), usually immediately following penetrating chest trauma, not 2 days later after limb stabilization. * **Pulmonary Edema:** While it causes dyspnea, it is usually associated with fluid overload or cardiac failure. In a young trauma patient without a history of heart disease, it is less likely than FES. * **Pulmonary Infarction:** This is a late complication of Pulmonary Embolism (PE). While PE is a differential, it usually occurs later (5–10 days post-surgery) due to DVT, whereas FES occurs within the first 72 hours. **Clinical Pearls for NEET-PG:** * **Gurd’s Criteria** is used for the diagnosis of FES. * **Snowstorm appearance** on Chest X-ray is a characteristic (though late) finding. * **Management:** Primarily supportive (Oxygenation/Ventilation). Early stabilization of fractures is the best preventive measure. * **Most common site of petechiae:** Conjunctiva and axilla.

Q: Which of the following is NOT a common site for fracture non-union?

Distal end of the radius. **Explanation:** The correct answer is **Distal end of the radius**. Non-union is defined as a permanent failure of bone healing. The distal end of the radius is characterized by **cancellous (spongy) bone** and a rich vascular supply. Cancellous bone has a large surface area and high osteogenic potential, which facilitates rapid and reliable healing. Consequently, fractures like Colles' fracture almost always unite, though they may result in *malunion* (healing in a bad position) rather than non-union. **Why the other options are common sites for non-union:** * **Waist of the scaphoid:** This site is notorious for non-union due to its **retrograde blood supply**. The vessels enter the distal pole; a fracture at the waist cuts off the blood supply to the proximal pole, leading to avascular necrosis (AVN) and non-union. * **Neck of the femur:** This is an **intracapsular** fracture. The synovial fluid contains collagenases that inhibit callus formation, and the blood supply (mainly via the medial circumflex femoral artery) is frequently disrupted, leading to high rates of non-union and AVN. * **Distal third of tibia:** This area has a **tenuous blood supply** and minimal soft tissue/muscle cover. The nutrient artery enters the bone in the upper third, leaving the distal third prone to ischemia and subsequent non-union. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of non-union in the body:** Scaphoid (specifically the waist). * **Most common long bone for non-union:** Tibia (distal third). * **Atrophic Non-union:** Characterized by "pencil-like" bone ends on X-ray due to poor vascularity. * **Hypertrophic Non-union:** Characterized by "elephant foot" appearance, indicating adequate blood supply but inadequate immobilization.

Q: A fracture of the proximal third of the ulna is associated with dislocation of the radial head. Which of the following injury types is this most likely to be?

Monteggia's deformity. **Explanation:** The correct answer is **Monteggia’s deformity**. This injury is defined as a **fracture of the proximal third of the ulna** associated with **dislocation of the proximal radio-ulnar joint (radial head dislocation)**. The underlying medical concept involves the anatomical relationship between the radius and ulna; they act as a "closed ring" system. When one bone suffers a displaced fracture, the force is often transmitted to the other, leading to either a second fracture or a dislocation of the adjacent joint. In Monteggia's injury, the ulnar shaft breaks, and the force displaces the radial head, most commonly in an anterior direction. **Analysis of Incorrect Options:** * **A. Navicular (scaphoid) fracture:** This is a fracture of a carpal bone in the wrist, usually caused by a fall on an outstretched hand (FOOSH). It does not involve the ulna or radial head. * **C. Greenstick fracture:** This is an incomplete fracture typically seen in children where the bone bends and cracks but does not break completely. It describes a fracture morphology, not a specific injury pattern involving dislocation. * **D. Spiral fracture:** This describes a fracture line caused by a twisting (rotational) force. Like the greenstick fracture, it is a descriptive term for the break itself rather than a named fracture-dislocation complex. **Clinical Pearls for NEET-PG:** * **Mnemonic (MU-GR):** **M**onteggia = **U**lna fracture (proximal); **G**aleazzi = **R**adius fracture (distal). * **Galeazzi Fracture:** Fracture of the distal third of the radius with dislocation of the distal radio-ulnar joint (DRUJ). * **Bado Classification:** Used to classify Monteggia fractures based on the direction of radial head dislocation (Type I/Anterior is the most common). * **Nerve Injury:** The **Posterior Interosseous Nerve (PIN)**, a branch of the radial nerve, is the most commonly injured nerve in Monteggia fractures.

Question 1

In fracture shaft of femur, which nail is commonly used for ORIF?

Accepted Answer

Kuntscher nail

Answer

Austin Moore pin

Answer

K-wire

Answer

Smith-Peterson nail

Question 2

Open book and bucket handle injuries are seen in which anatomical region?

Accepted Answer

Pelvis

Answer

Spine

Answer

Femur

Answer

Knee

Question 3

The Judet and Lectournal classification is used for which type of fracture?

Accepted Answer

Acetabulum fracture

Answer

Supracondylar humerus fracture

Answer

Shaft femur fracture

Answer

Patella fracture

Question 4

Sectoral sign is positive in which of the following conditions?

Accepted Answer

Avascular necrosis of femur head

Answer

Osteoarthritis of hip

Answer

Protrusio acetabuli

Answer

Slipped capital femoral epiphyses

Question 5

Which of the following are the characteristic features of a fracture of the neck of the femur?

Accepted Answer

Shortening and lateral rotation

Answer

Flexion at the hip and lateral rotation

Answer

Flexion at the hip and abduction

Answer

Shortening and flexion

Question 6

A 36-year-old man sustained a soccer injury. What procedure needs to be performed urgently?

Accepted Answer

Manipulation to improve alignment

Answer

A CT scan

Answer

Application of a cast to maintain alignment

Answer

Internal fixation

Question 7

A 32-year-old male with a history of recurrent posterior dislocation of the shoulder joint. Which aspect of the humeral head is likely to show the lesion?

Accepted Answer

Anteromedial

Answer

Anterolateral

Answer

Posteromedial

Answer

Posterolateral

Question 8

A 32-year-old man sustains fractures of the right femur and tibia and the left humerus following a vehicular accident. The fractures are stabilized surgically. He remains in stable condition for 2 days, but then suddenly becomes severely dyspneic. Which of the following complications from his injuries is the most likely cause of his sudden respiratory difficulty?

Accepted Answer

Fat embolism

Answer

Cardiac tamponade

Answer

Pulmonary edema

Answer

Pulmonary infarction

Question 9

Which of the following is NOT a common site for fracture non-union?

Accepted Answer

Distal end of the radius

Answer

Waist of the scaphoid

Answer

Neck of the femur

Answer

Distal third of tibia and fibula

Question 10

A fracture of the proximal third of the ulna is associated with dislocation of the radial head. Which of the following injury types is this most likely to be?

Accepted Answer

Monteggia's deformity

Answer

Navicular (scaphoid) fracture

Answer

Greenstick fracture

Answer

Spiral fracture

Trauma — MCQs

Trauma — MCQs

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