Trauma Practice Questions

Q: A 34-year-old woman sustained a direct blow to the patella from the dashboard during an automobile crash. Radiographic examination reveals patellofemoral syndrome, characterized by lateral dislocation of the patella. Which of the following muscles requires strengthening through physical rehabilitation to prevent future dislocations?

Vastus medialis. ### Explanation **1. Why Vastus Medialis is Correct:** The patella has a natural tendency to dislocate **laterally** due to the "Q-angle" (the angle between the quadriceps tendon and the patellar ligament). To counteract this lateral pull, the body relies on dynamic and static stabilizers. The **Vastus Medialis**, specifically its horizontal fibers known as the **Vastus Medialis Obliquus (VMO)**, is the primary dynamic stabilizer that pulls the patella medially. In cases of patellofemoral syndrome or recurrent lateral dislocations, strengthening the VMO is the cornerstone of conservative management to realign the patella within the trochlear groove. **2. Why the Other Options are Incorrect:** * **Vastus Lateralis (A):** This muscle is located on the outer aspect of the thigh. Strengthening it would increase the lateral pull on the patella, potentially worsening the lateral maltracking or dislocation. * **Vastus Intermedius (C) & Rectus Femoris (D):** These muscles primarily contribute to the superior pull of the patella for knee extension. While they are part of the quadriceps mechanism, they do not provide the specific medial vector force required to prevent lateral displacement. **3. Clinical Pearls for NEET-PG:** * **Q-Angle:** A higher Q-angle (common in females due to a wider pelvis) increases the risk of lateral patellar subluxation. * **Patellar Dislocation:** Almost always occurs **laterally**. The most common mechanism is a twisting injury or direct lateral force. * **Apprehension Test (Fairbank’s Sign):** The clinical test used to diagnose patellar instability; the patient becomes anxious when the examiner attempts to push the patella laterally. * **Radiology:** The **Merchant view** or **Sunrise view** X-ray is best for evaluating the patellofemoral joint.

Q: In Volkmann's ischemic contracture, what is the recommended timeframe for surgical intervention?

Within 6 hours. **Explanation:** Volkmann’s Ischemic Contracture (VIC) is the permanent end-stage sequela of untreated **Acute Compartment Syndrome**, most commonly following supracondylar fractures of the humerus. **1. Why "Within 6 Hours" is Correct:** The underlying pathophysiology is muscle and nerve ischemia due to increased intracompartmental pressure. Muscle tissue can tolerate ischemia for approximately **4 to 6 hours** before irreversible necrosis begins. Surgical decompression via **fasciotomy** must be performed within this "golden window" to restore perfusion and prevent the replacement of contractile muscle fibers with non-contractile fibrous tissue (infarction). **2. Analysis of Incorrect Options:** * **Within 1 hour (A):** While immediate intervention is ideal, 1 hour is clinically impractical for diagnosis and surgical prep, and tissue remains viable beyond this point. * **Within 24 hours (C) & 72 hours (D):** These timeframes are far beyond the threshold of muscle viability. By 12–24 hours, myonecrosis is usually complete, leading to permanent contracture, claw hand deformity, and sensory loss. **3. NEET-PG High-Yield Pearls:** * **Earliest Sign:** Severe pain out of proportion to the injury and **pain on passive stretching** of muscles. * **The 5 P’s:** Pain, Pallor, Paresthesia, Paralysis, and Pulselessness (Note: Pulselessness is a *late* sign). * **Most Common Muscle Involved:** Flexor Digitorum Profundus (FDP) and Flexor Pollicis Longus (FPL). * **Classic Deformity:** A "claw-like" hand with wrist flexion, metacarpophalangeal (MCP) joint hyperextension, and interphalangeal (IP) joint flexion. * **Diagnosis:** Primarily clinical, but can be confirmed by measuring intracompartmental pressure (e.g., Stryker monitor); a Delta pressure (Diastolic BP – Compartment pressure) **< 30 mmHg** is diagnostic.

Q: Which of the following arteries is affected in anterior shoulder dislocation?

Axillary. **Explanation:** **Anterior shoulder dislocation** is the most common type of joint dislocation (approx. 95%). The correct answer is **Axillary artery** because of its close anatomical proximity to the glenohumeral joint. 1. **Why Axillary Artery is Correct:** The axillary artery passes directly anterior to the shoulder joint. When the humeral head is displaced anteriorly and inferiorly (subcoracoid or subglenoid), it can compress or stretch the third part of the axillary artery. While vascular injury is less common than nerve injury, it is a critical complication, especially in elderly patients with atherosclerotic vessels. 2. **Why Other Options are Incorrect:** * **Radial, Median, and Ulnar:** These are not arteries; they are **nerves**. Even if the question implied the *nerves* of the same name, the Radial and Ulnar nerves are less commonly involved in shoulder dislocations compared to the Axillary nerve. The Median nerve is located more medially and is rarely affected at this level. **Clinical Pearls for NEET-PG:** * **Most Common Nerve Injured:** The **Axillary Nerve** (Regimental badge anesthesia and deltoid paralysis). * **Most Common Vascular Injury:** The **Axillary Artery** (Look for absent distal pulses or expanding hematoma). * **Hill-Sachs Lesion:** A compression fracture of the posterosuperolateral humeral head (occurs during anterior dislocation). * **Bankart Lesion:** Avulsion of the anterior-inferior glenoid labrum. * **Kocher’s Method:** A classic reduction technique (though no longer preferred due to high complication rates like humeral fractures). **Milch** and **Stimson** are safer alternatives.

Q: What is the best investigation for the detection of a stress fracture?

MRI. **Explanation:** The diagnosis of a stress fracture requires high sensitivity to detect early physiological changes in the bone before structural failure occurs. **Why MRI is the Correct Answer:** MRI is the **most sensitive (99%) and specific** investigation for detecting stress fractures. It can identify "stress reactions" (the precursor to a fracture) by detecting **bone marrow edema** and periosteal inflammation. These changes are visible on MRI within 24–72 hours of symptom onset, long before any cortical changes appear on other imaging modalities. **Analysis of Incorrect Options:** * **X-ray:** This is the initial investigation of choice but has very low sensitivity (15–35%) in the early stages. A stress fracture may not appear on an X-ray for 2–6 weeks, often appearing only when the **callus formation** or a "dreaded black line" becomes visible. * **CT scan:** While excellent for viewing cortical anatomy and identifying a distinct fracture lucency (nidus), it is less sensitive than MRI for early marrow changes and involves significant radiation. It is usually reserved for complex areas like the tarsal navicular. * **Bone Scan (Technetium-99m):** Historically, this was the investigation of choice due to its high sensitivity. However, it has **low specificity**, as it shows increased uptake (hot spots) in cases of infection, tumors, or trauma. It has been superseded by MRI, which offers superior anatomical detail without radiation. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard/Best Investigation:** MRI. * **Initial Investigation:** X-ray. * **Most common site:** Tibia (overall), followed by metatarsals (March fracture). * **Female Athlete Triad:** Disordered eating, amenorrhea, and osteoporosis—highly associated with stress fractures. * **Early Sign on MRI:** Bone marrow edema on T2/STIR sequences.

Q: In posterior dislocation of the elbow, which bony prominence is most apparent?

Olecranon process. **Explanation:** In a **posterior dislocation of the elbow** (the most common type), the radius and ulna are displaced posteriorly and superiorly relative to the distal humerus. This occurs typically due to a fall on an outstretched hand with the elbow in slight flexion. **1. Why Olecranon Process is correct:** The **olecranon process** is the proximal-most part of the ulna that articulates with the olecranon fossa of the humerus. When the forearm bones shift posteriorly, the olecranon becomes abnormally prominent behind the humerus. Clinically, this disrupts the **"Three-Point Relationship"** (the isosceles triangle formed by the medial epicondyle, lateral epicondyle, and olecranon in flexion), making the olecranon the most visible and palpable bony landmark. **2. Why other options are incorrect:** * **Coronoid process:** This is located anteriorly on the ulna. In a posterior dislocation, it is often fractured as it strikes the distal humerus, but it is buried deep within the soft tissues and is not prominent. * **Radial head:** While the radial head also moves posteriorly, it is lateral and deeper compared to the massive, subcutaneous olecranon. * **Ulnar styloid process:** This is located at the distal end of the ulna (wrist). It is unaffected by elbow dislocations. **Clinical Pearls for NEET-PG:** * **Most common complication:** Stiffness (Loss of terminal extension). * **Most common nerve injured:** Ulnar nerve (though Median nerve can be involved). * **Associated Fracture:** "Terrible Triad of the Elbow" (Posterior dislocation + Coronoid fracture + Radial head fracture). * **Differential Diagnosis:** Supracondylar fracture of the humerus (where the three-point relationship remains intact).

Q: Which of the following is not a classification of humerus fractures?

Garden's. **Explanation:** The correct answer is **Garden’s Classification**, as it is used for **Fractures of the Neck of Femur**, not the humerus. It classifies subcapital femoral neck fractures into four stages based on the degree of displacement and the alignment of medial trabeculae, which helps determine the risk of avascular necrosis (AVN). **Analysis of other options:** * **Neer’s Classification:** This is the standard classification for **Proximal Humerus fractures**. It is based on the displacement of four anatomical segments: the greater tuberosity, lesser tuberosity, articular surface (head), and the humeral shaft. * **Gartland’s Classification:** (Note: Often misspelled as Galand's in exams). This is the most widely used system for **Supracondylar fractures of the humerus** in children. It categorizes fractures into Type I (undisplaced), Type II (displaced with intact posterior cortex), and Type III (completely displaced). * **Milch Classification:** This is used for **Condylar fractures of the humerus** (specifically the lateral or medial condyle). It distinguishes fractures based on whether the fracture line passes through the trochlear groove (Milch Type II) or lateral to it (Milch Type I), determining elbow stability. **High-Yield Clinical Pearls for NEET-PG:** * **Holstein-Lewis Fracture:** A spiral fracture of the distal 1/3rd of the humeral shaft, frequently associated with **Radial Nerve palsy**. * **Laugier’s Sign:** Ecchymosis over the inner aspect of the arm, seen in displaced fractures of the humeral neck. * **Garden’s Index:** Used post-reduction of femoral neck fractures; an acceptable reduction shows an angle of 155°–160° on AP view and 180° on lateral view.

Q: Which of the following femoral shaft fractures are most suitable for internal fixation with a Kuntscher nail?

Transverse fracture of mid-shaft. ### Explanation The **Kuntscher nail (K-nail)** is a cloverleaf-shaped intramedullary nail that works on the principle of **three-point fixation**. It is a non-locking nail, meaning it relies entirely on the friction between the nail and the endosteal surface of the bone for stability. **Why Option A is Correct:** The ideal site for a K-nail is the **mid-shaft** because the medullary canal is narrowest at the isthmus, providing the tightest "snug fit." A **transverse fracture** is the most stable configuration for this device because the bone ends can buttress against each other, preventing shortening. Since the K-nail cannot be "locked" with screws, it can only resist angulation; it relies on the transverse fracture geometry to resist axial loading (shortening). **Why Other Options are Incorrect:** * **B. Spiral & C. Oblique Fractures:** These are inherently unstable. Without locking bolts, a K-nail cannot prevent the bone fragments from sliding past each other, leading to **telescoping (shortening)** and rotational deformity. * **C. Distal Third:** The medullary canal widens significantly in the distal femur (metaphysis). A K-nail would "wobble" in this wide space, failing to achieve the necessary three-point fixation. * **D. Subtrochanteric Fracture:** These fractures are subject to high biomechanical stresses and are proximal to the isthmus. A non-locking nail cannot provide adequate proximal stability here. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard:** For most adult femoral shaft fractures today, the **Interlocking Intramedullary Nail** is the treatment of choice (allows for early weight-bearing in comminuted/unstable fractures). * **K-nail Principle:** It is a **load-sharing** device. * **Indication:** Only stable, transverse, mid-shaft fractures (Zone 2). * **Cross-section:** The K-nail has a **cloverleaf** cross-section to provide elasticity and a better grip on the endosteum.

Q: A fall on the heel is commonly associated with which of the following fractures or dislocations?

Fracture of the vertebra. **Explanation:** The correct answer is **Fracture of the vertebra**. This association is a classic example of **indirect trauma** and the transmission of axial loading forces. **1. Why Fracture of the Vertebra is Correct:** When a person falls from a height and lands on their heels, the kinetic energy travels proximally through the skeletal system. This axial loading force is transmitted from the calcaneum, through the talus, tibia, and femur, into the pelvis, and finally to the **axial skeleton (spine)**. The most common site of injury is the **thoracolumbar junction (T12-L1)**, as this is the transition zone between the rigid thoracic spine and the mobile lumbar spine. This specific mechanism is often referred to as the **"Don Juan Syndrome"** (or Lover’s Leap injury), characterized by concurrent fractures of the calcaneum and the spine. **2. Why Other Options are Incorrect:** * **Fracture of the clavicle:** Typically occurs due to a fall on an outstretched hand (FOOSH) or a direct blow to the shoulder. * **Fracture of the femur:** Usually requires high-energy trauma like motor vehicle accidents or direct falls in elderly osteoporotic patients. * **Posterior dislocation of the hip:** Most commonly occurs in "dashboard injuries" where the knee strikes a dashboard, forcing the femoral head out of the acetabulum while the hip is flexed. **3. NEET-PG High-Yield Pearls:** * **Rule of Two:** In any patient presenting with a bilateral calcaneal fracture, you **must** screen the spine (specifically T12-L1) with radiographs, even if the patient is asymptomatic. * **Most common site:** The calcaneum is the most frequently fractured tarsal bone. * **Mondor’s Sign:** Ecchymosis extending to the sole of the foot is a clinical sign of calcaneal fracture. * **Bohler’s Angle:** A decrease in this angle (normal: 25°–40°) on a lateral X-ray indicates a depressed calcaneal fracture.

Q: Which of the following is NOT a delayed complication of a fracture?

Hypovolemic shock. **Explanation:** Complications of fractures are clinically categorized based on the timing of their onset: **Immediate** (at the time of injury), **Early** (within days), and **Late/Delayed** (weeks to years later). **Why Hypovolemic Shock is the Correct Answer:** Hypovolemic shock is an **immediate/early complication**. It occurs due to significant internal or external hemorrhage following a fracture (e.g., a pelvic fracture can lead to 2–3 liters of blood loss, and a femoral shaft fracture can lead to 1–1.5 liters). Because it occurs acutely and requires emergent resuscitation, it cannot be classified as a delayed complication. **Analysis of Incorrect Options (Delayed Complications):** * **Osteoarthritis:** This is a late sequela, often occurring years after an intra-articular fracture due to joint surface irregularity (Post-traumatic Arthritis). * **Joint Stiffness:** This develops over weeks to months due to prolonged immobilization, intra-articular adhesions, or soft tissue fibrosis. * **Avascular Necrosis (AVN):** This is a delayed complication resulting from the interruption of blood supply to the bone (common in the femoral head, scaphoid, and talus). It typically manifests months after the initial trauma. **High-Yield Clinical Pearls for NEET-PG:** * **Immediate Complications:** Hypovolemic shock, injury to major vessels (e.g., Popliteal artery in knee dislocation), and nerve injuries. * **Early Complications:** Fat embolism, Compartment syndrome, and Thromboembolism (DVT/PE). * **Delayed Complications:** Delayed union, Non-union, Malunion, AVN, Sudeck's atrophy (CRPS), and Myositis ossificans. * **Memory Tip:** Think of "Shock" as a "Right Now" problem, while the other options are "Down the Road" problems.

Question 1

A 34-year-old woman sustained a direct blow to the patella from the dashboard during an automobile crash. Radiographic examination reveals patellofemoral syndrome, characterized by lateral dislocation of the patella. Which of the following muscles requires strengthening through physical rehabilitation to prevent future dislocations?

Accepted Answer

Vastus medialis

Answer

Vastus lateralis

Answer

Vastus intermedius

Answer

Rectus femoris

Question 2

In Volkmann's ischemic contracture, what is the recommended timeframe for surgical intervention?

Accepted Answer

Within 6 hours

Answer

Within 1 hour

Answer

Within 24 hours

Answer

Within 72 hours

Question 3

Which of the following arteries is affected in anterior shoulder dislocation?

Accepted Answer

Axillary

Answer

Radial

Answer

Median

Answer

Ulnar

Question 4

Which of the following is NOT a characteristic feature of acute compartment syndrome in the lower leg?

Accepted Answer

Normal sensation distally

Answer

Acute pain on employing the stretch test

Answer

Normal pulses

Answer

Venous occlusion

Question 5

What is the best investigation for the detection of a stress fracture?

Accepted Answer

MRI

Answer

X-ray

Answer

CT scan

Answer

Bone scan

Question 6

In posterior dislocation of the elbow, which bony prominence is most apparent?

Accepted Answer

Olecranon process

Answer

Coronoid process

Answer

Radial head

Answer

Ulnar styloid process

Question 7

Which of the following is not a classification of humerus fractures?

Accepted Answer

Garden's

Answer

Neer's

Answer

Galand's

Answer

Milch

Question 8

Which of the following femoral shaft fractures are most suitable for internal fixation with a Kuntscher nail?

Accepted Answer

Transverse fracture of mid-shaft

Answer

Spiral fracture of mid-shaft

Answer

Oblique fracture of the distal third of the shaft

Answer

Subtrochanteric fracture

Question 9

A fall on the heel is commonly associated with which of the following fractures or dislocations?

Accepted Answer

Fracture of the vertebra

Answer

Fracture of the clavicle

Answer

Fracture of the femur

Answer

Posterior dislocation of the hip

Question 10

Which of the following is NOT a delayed complication of a fracture?

Accepted Answer

Hypovolemic shock

Answer

Osteoarthritis

Answer

Joint stiffness

Answer

Avascular necrosis

Trauma — MCQs

Trauma — MCQs

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