Trauma Practice Questions

Q: What is the most common cause of vascular injury in supracondylar fractures in children?

Supracondylar humerus fracture. **Explanation:** **Supracondylar humerus fractures** are the most common fractures around the elbow in children (peaking at ages 5–8). The **Gartland Type III (displaced)** extension-type fracture is the most frequent cause of vascular injury. In these cases, the sharp proximal fracture fragment is displaced anteriorly, where it can tether, pinch, or lacerate the **brachial artery**, which lies directly in front of the distal humerus. This can lead to an absent radial pulse or, in severe cases, Volkmann’s Ischemic Contracture. **Analysis of Incorrect Options:** * **Lateral Condyle Humerus Fracture:** While common, these are intra-articular fractures that usually involve minor displacement or rotation. They are more notorious for causing **cubitus valgus** and **tardy ulnar nerve palsy** rather than acute vascular compromise. * **Medial Condyle Humerus Fracture:** These are rare in children. While they may involve the ulnar nerve, they are not typically associated with major arterial injury. * **Both Bone Forearm Fracture:** These are very common pediatric fractures but usually result in soft tissue swelling or compartment syndrome rather than direct major vascular (brachial artery) injury. **Clinical Pearls for NEET-PG:** * **Most common nerve injured:** Anterior Interosseous Nerve (AIN) – branch of the Median nerve (test by asking the child to make an "OK" sign). * **Most common nerve in Flexion-type:** Ulnar nerve. * **Pink Pulseless Hand:** A clinical scenario where the hand is warm/perfused but the radial pulse is absent; it requires urgent reduction. * **Golden Rule:** Always check the distal neurovascular status before and after splinting/reduction.

Q: Maximum shortening of the lower limb is seen in fractures of which part of the femur?

Shaft of femur. **Explanation:** The degree of shortening in femoral fractures is primarily determined by the **magnitude of muscle pull** acting on the bone fragments. **1. Why Shaft of Femur is Correct:** The femoral shaft is surrounded by the body's most powerful muscle groups (quadriceps, hamstrings, and adductors). When a fracture occurs here, these muscles undergo intense spasm, causing significant **proximal migration** (overlapping) of the distal fragment. This results in the maximum clinical shortening, often ranging from **3 to 5 cm** or more. **2. Analysis of Incorrect Options:** * **Neck of Femur (B) & Transcervical (D):** These are intracapsular fractures. The strong hip capsule and the iliofemoral ligament (Bigelow's ligament) act as a sleeve that limits the upward displacement of the distal fragment. Shortening is typically minimal, usually **1 to 2 cm**. * **Intertrochanteric Region (C):** While these are extracapsular and can show more shortening than neck fractures (due to the pull of the gluteal muscles), the displacement is still generally less than that seen in mid-shaft fractures where the entire length of the thigh muscles contributes to the deformity. **3. Clinical Pearls for NEET-PG:** * **Shortening Rule of Thumb:** Shaft (>3 cm) > Intertrochanteric (2–3 cm) > Neck of Femur (1–2 cm). * **Deformity Profile:** Neck of femur fractures present with **external rotation of 45°**, whereas Intertrochanteric fractures present with more exaggerated **external rotation of nearly 90°** (as the fracture is outside the capsule). * **Thomas Splint:** Specifically designed to counteract the powerful muscle pull in shaft fractures to maintain length and prevent further soft tissue injury.

Q: Which of the following statements regarding shoulder dislocation is true?

All of the above.. The correct answer is **D. All of the above.** Shoulder dislocations are a high-yield topic for NEET-PG, particularly the distinction between anterior and posterior types. ### **Detailed Explanation** * **Posterior dislocation is often overlooked (Option A):** Unlike anterior dislocations, which present with a prominent "squared-off" shoulder, posterior dislocations have subtle clinical findings. They are frequently missed (up to 50% of cases) because the arm is held in internal rotation and adduction, which can be mistaken for a simple soft tissue injury or frozen shoulder. * **Pain is severe in anterior dislocation (Option B):** Anterior dislocation (the most common type, >95%) is associated with intense pain, muscle spasms, and a complete inability to move the arm. The patient typically holds the arm in slight abduction and external rotation. * **Radiography may be misleading in posterior dislocation (Option C):** On a standard Anteroposterior (AP) view, a posterior dislocation can look deceptively normal. Key subtle signs include the **"Light Bulb Sign"** (the internally rotated humeral head looks circular) and the **"Empty Glenoid Sign."** An **Axillary view** or Scapular Y-view is essential to confirm the diagnosis. ### **NEET-PG High-Yield Pearls** * **Mechanism for Posterior Dislocation:** Classically occurs during **Seizures, Electric shocks**, or high-energy trauma (Triple 'E': Epilepsy, Electricity, Ethanol). * **Most Common Nerve Injury:** **Axillary nerve** (tested by sensation over the "Regimental Badge" area), most common in anterior dislocations. * **Hill-Sachs Lesion:** A compression fracture of the posterosuperolateral humeral head (seen in anterior dislocations). * **Reverse Hill-Sachs (McLaughlin Lesion):** An impaction fracture of the anterior humeral head (seen in posterior dislocations). * **Bankart Lesion:** Avulsion of the anterior-inferior glenoid labrum.

Q: Banka's lesion is seen at which anatomical location?

Anterior surface of glenoid labrum. **Explanation:** A **Bankart lesion** is the hallmark pathological finding in recurrent **anterior shoulder dislocation**. It occurs when the humeral head is forced out of the glenoid cavity, causing an avulsion of the **anteroinferior glenoid labrum** along with the attached inferior glenohumeral ligament (IGHL) complex. * **Why Option B is Correct:** The mechanism of most shoulder dislocations is anterior-inferior. As the humeral head displaces forward, it shears off the **anterior surface of the glenoid labrum**. This loss of the "chock-block" effect leads to joint instability and recurrent dislocations. * **Why Option A is Incorrect:** A lesion at the posterior labrum is known as a **Reverse Bankart lesion**, which is associated with posterior shoulder dislocations (commonly seen in seizures or electric shocks). * **Why Option C is Incorrect:** This is a distractor. While the anterior head may be involved in other pathologies, the specific "Bankart" eponym refers to the labrum. * **Why Option D is Incorrect:** A compression fracture on the **posterosuperior aspect of the humeral head** is known as a **Hill-Sachs lesion**. It occurs when the humeral head impacts the sharp anterior glenoid rim during an anterior dislocation. **High-Yield Clinical Pearls for NEET-PG:** 1. **Bony Bankart:** When the labral avulsion includes a fracture of the anterior glenoid rim. 2. **Hill-Sachs Lesion:** The "companion" bony injury to a Bankart lesion, found on the posterior humeral head. 3. **Gold Standard Investigation:** **MRI Arthrography** is the investigation of choice to visualize labral tears. 4. **Surgery:** The **Bankart Repair** (reattaching the labrum) is the standard surgical treatment for recurrent instability.

Question 1

What is the most common cause of vascular injury in supracondylar fractures in children?

Accepted Answer

Supracondylar humerus fracture

Answer

Lateral condyle humerus fracture

Answer

Medial condyle humerus fracture

Answer

Both bone forearm fracture

Question 2

What is a Galeazzi fracture?

Accepted Answer

Fracture of the distal third of the radius with distal radioulnar joint (DRUJ) subluxation

Answer

Fracture of the proximal third of the radius with distal radioulnar joint (DRUJ) subluxation

Answer

Fracture of the distal third of the radius without distal radioulnar joint (DRUJ) subluxation

Answer

Fracture of the proximal third of the radius without distal radioulnar joint (DRUJ) subluxation

Question 3

What is the most common cause of fracture in a patient with hemophilia?

Accepted Answer

Osteoporosis and restricted joint movement

Answer

Osteonecrosis

Answer

Iron deposition

Answer

Pseudo-tumors

Question 4

Fracture of the femur at the level of the isthmus is best treated by?

Accepted Answer

Intramedullary nail fixation

Answer

Plate and screws

Answer

Closed reduction

Answer

External fixation

Question 5

Maximum shortening of the lower limb is seen in fractures of which part of the femur?

Accepted Answer

Shaft of femur

Answer

Neck of femur

Answer

Intertrochanteric region of femur

Answer

Transcervical fracture of femur

Question 6

A 7-year-old boy presented with a fracture of the left subcondylar region with undisturbed occlusion. What is the recommended treatment?

Accepted Answer

No immobilization and active treatment

Answer

Immobilization for 7 days

Answer

Immobilization for 14 days with intermittent active opening

Answer

No immobilization with restricted mouth opening for 10 days

Question 7

In classical scaphoid cast, what is the position of the wrist?

Accepted Answer

Dorsal and ulnar flexion

Answer

Dorsal and radial flexion

Answer

Ventral and ulnar flexion

Answer

Ventral and radial flexion

Question 8

Which of the following statements regarding shoulder dislocation is true?

Accepted Answer

All of the above.

Answer

Posterior dislocation is often overlooked.

Answer

Pain is severe in anterior dislocation.

Answer

Radiography may be misleading in posterior dislocation.

Question 9

Banka's lesion is seen at which anatomical location?

Accepted Answer

Anterior surface of glenoid labrum

Answer

Posterior surface of glenoid labrum

Answer

Anterior part of head of humerus

Answer

Posterior part of head of humerus

Question 10

Which of the following statements regarding vertebral fractures is false?

Accepted Answer

Clay shoveler's fracture typically involves the lower cervical vertebrae (e.g., C6-C7).

Answer

Hangman fracture involves the axis (C2 vertebra).

Answer

Jefferson's fracture involves the atlas (C1 vertebra).

Answer

Undertaker's fracture involves the C6-C7 disc space.

Trauma — MCQs

Trauma — MCQs

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