Trauma Practice Questions

Q: What deformity is typically seen in a posterior elbow dislocation?

Flexion. In a **posterior elbow dislocation**, which is the most common type of elbow dislocation, the radius and ulna are displaced posteriorly and superiorly relative to the distal humerus. ### **Explanation of the Correct Answer** **A. Flexion:** Following the injury, the elbow is typically held in a position of **semi-flexion (approximately 45° to 90°)**. This occurs because the triceps tendon is stretched over the displaced olecranon, acting as a tether, while the brachialis and biceps muscles undergo protective spasms. This position minimizes intra-articular pressure and tension on the surrounding soft tissues. ### **Explanation of Incorrect Options** * **B. Extension:** The elbow cannot be extended due to the mechanical locking of the olecranon against the posterior humerus and the intense pain/spasm of the flexor muscles. * **C & D. Medial/Lateral Deviation:** While minor side-to-side displacement may occur depending on the direction of the force, these are not the characteristic "deformity" positions. The primary clinical presentation is defined by the sagittal plane (flexion). ### **NEET-PG High-Yield Pearls** * **Mechanism of Injury:** Most commonly a fall on an outstretched hand (FOOSH) with the elbow in extension and abduction. * **Clinical Sign:** The **Three-Point Relationship** (the triangle formed by the olecranon and the two epicondyles) is **disturbed** in dislocation, whereas it remains intact in supracondylar fractures. * **Associated Injury:** Always check for **Brachial Artery** and **Median/Ulnar nerve** injuries. * **Radiology:** The "fat pad sign" may be seen, but the diagnosis is confirmed by the posterior displacement of the olecranon on a lateral X-ray. * **Management:** Emergency closed reduction followed by brief immobilization in flexion.

Q: What is a straddle fracture?

Pelvic fracture. **Explanation:** A **Straddle Fracture** is a specific type of unstable pelvic fracture characterized by **bilateral fractures of the superior and inferior pubic rami**. It is typically caused by a direct blow to the midline of the symphysis pubis, such as falling onto a hard object (e.g., a manhole cover or a bicycle frame). **Why the correct answer is right:** * **Pelvic Fracture:** The term "straddle" refers to the mechanism of injury involving the perineum. This injury results in a "floating" anterior segment of the pelvis. It is clinically significant because it is associated with a high incidence (up to 20%) of **genitourinary injuries**, particularly ruptures of the posterior urethra or bladder. **Why the incorrect options are wrong:** * **A. Fracture of the skull:** Skull fractures are classified by location (vault, base) or type (depressed, linear), but "straddle" is not a term used in neurotrauma. * **B. Fracture of C5 vertebra:** Cervical fractures have specific names like Jefferson (C1) or Hangman’s (C2). C5 is a common site for burst fractures, but not straddle fractures. * **C. Multiple rib fractures:** This describes a **Flail Chest** (if 3 or more ribs are broken in 2 or more places), which causes paradoxical respiration. **High-Yield Clinical Pearls for NEET-PG:** * **Malgaigne Fracture:** The most common vertical shear pelvic fracture (ipsilateral rami fracture + sacroiliac joint disruption). * **Duverney Fracture:** Isolated fracture of the iliac wing (stable). * **Open Book Injury:** Disruption of the pubic symphysis with injury to the sacroiliac ligaments. * **Investigation of Choice:** AP view X-ray is the initial screening tool, but **CT Scan** is the gold standard for defining pelvic ring stability. * **Management:** In hemodynamically unstable pelvic fractures, the first step is **Pelvic Binding** to reduce pelvic volume and tamponade bleeding.

Q: Which of the following statements is NOT true regarding anterior dislocation of the hip?

Associated with shortening of the limb.. **Explanation:** In hip dislocations, the clinical presentation is determined by the final position of the femoral head relative to the acetabulum. In **Anterior Dislocation of the Hip**, the femoral head is displaced anteriorly and usually inferiorly (obturator type) or superiorly (pubic type). **1. Why Option D is the Correct Answer (The "False" Statement):** In anterior dislocations, the femoral head is displaced away from the acetabulum in a manner that typically results in **lengthening** of the limb, not shortening. Shortening is a hallmark feature of **posterior** hip dislocations. Therefore, the statement "Associated with shortening of the limb" is incorrect regarding anterior dislocation. **2. Analysis of Other Options:** * **Option A (Femoral nerve injury):** In anterior dislocations, the femoral head moves forward, putting direct pressure on the **femoral nerve** and vessels. (In contrast, the sciatic nerve is at risk in posterior dislocations). * **Option B (Lateral rotation):** The displacement of the head anterior to the axis of the femur causes the limb to assume a position of **external (lateral) rotation** and abduction. * **Option C (Lengthening):** As the head is displaced inferiorly and anteriorly, the effective length of the limb increases. **Clinical Pearls for NEET-PG:** | Feature | Posterior Dislocation (Most Common) | Anterior Dislocation | | :--- | :--- | :--- | | **Attitude** | Flexion, Adduction, **Internal Rotation** | Flexion, Abduction, **External Rotation** | | **Limb Length** | **Shortening** | **Lengthening** | | **Nerve Injury** | Sciatic Nerve | Femoral Nerve | | **Mechanism** | Dashboard injury | Forced abduction/extension | * **Mnemonic for Posterior Dislocation:** **S**hortened, **A**dducted, **I**nternally rotated (**SAI**). * **X-ray finding:** In anterior dislocation, the lesser trochanter is more visible due to external rotation.

Q: Which of the following fractures can cause cubitus varus deformity as a complication?

Supracondylar fracture of the humerus. **Explanation:** **Supracondylar fracture of the humerus** is the most common cause of **Cubitus Varus** (also known as "Gunstock deformity"). This deformity occurs primarily due to the **malunion** of the distal fragment, specifically when there is a failure to correct the **medial tilt, internal rotation, and posterior displacement**. While it is a cosmetic deformity rather than a functional one, it is a high-yield topic for NEET-PG. **Analysis of Options:** * **Option A (Lateral Condyle Fracture):** This fracture typically leads to **Cubitus Valgus** (increased carrying angle) due to non-union or growth arrest of the lateral epiphysis. Cubitus valgus is classically associated with **Tardy Ulnar Nerve Palsy**. * **Option C (Radial Head Fracture):** This involves the proximal radius and usually results in restricted forearm rotation (pronation/supination) or elbow stiffness, but does not typically alter the carrying angle of the humerus. * **Option D (Chronic Osteomyelitis):** While it can cause growth disturbances or bone destruction, it is not a primary or common cause of cubitus varus compared to the mechanical malunion of a supracondylar fracture. **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication of Supracondylar Fracture:** Stiffness (overall); **Cubitus Varus** (most common deformity). * **Most serious complication:** Volkmann’s Ischemic Contracture (VIC) due to brachial artery injury or compartment syndrome. * **Nerve Injuries:** The **Anterior Interosseous Nerve (AIN)** is the most common nerve injured in extension-type fractures; the Ulnar nerve is most common in flexion-type. * **Baumann’s Angle:** Used radiologically to assess the reduction and predict the risk of cubitus varus.

Q: A 4-year-old child sustained a fall on an outstretched hand. X-rays revealed a fracture line at the physis with a small metaphyseal fragment. There was no epiphyseal fracture. What type of injury is this according to the Salter-Harris Classification?

Type II. ### Explanation The **Salter-Harris Classification** is the standard system for describing pediatric physeal (growth plate) fractures. The correct answer is **Type II** based on the specific anatomical involvement described. #### Why Type II is Correct: In a **Salter-Harris Type II** injury, the fracture line travels through the **physis** (growth plate) and then exits through the **metaphysis**. The presence of a "small metaphyseal fragment" (known as the **Thurston-Holland sign**) is the pathognomonic feature of this type. It is the most common type of physeal injury, typically occurring in children older than 2 years. #### Why Other Options are Incorrect: * **Type I:** The fracture occurs exclusively through the physis. There is no bony involvement of the metaphysis or epiphysis. It is often a clinical diagnosis as X-rays may appear normal. * **Type III:** The fracture line passes through the physis and exits through the **epiphysis** into the joint space. This is an intra-articular fracture. * **Type IV:** The fracture line is vertical/oblique and passes through all three elements: the **metaphysis, physis, and epiphysis**. This carries a high risk of growth arrest. #### NEET-PG High-Yield Pearls: * **Mnemonic (SALTER):** * **S** (Type I): **S**ame/Straight across (Physis only) * **A** (Type II): **A**bove (Metaphysis) — *Most Common* * **L** (Type III): **L**ower (Epiphysis) — *Intra-articular* * **T** (Type IV): **T**hrough/Two (Metaphysis + Epiphysis) * **ER** (Type V): **ER**asure/Crush (Compression of physis) — *Worst Prognosis* * **Thurston-Holland Sign:** The triangular metaphyseal fragment seen in Type II fractures. * **Prognosis:** Types III and IV require anatomical reduction because they involve the joint surface and the germinal layer of the physis. Type V has the highest risk of premature physeal closure.

Q: What is a green-stick fracture?

Periosteum of cortex is intact and periosteum is crumpled. ### Explanation **Concept Overview:** A **Greenstick fracture** is an incomplete fracture typically seen in children. Because pediatric bones are more flexible and have a thick, active periosteum, they tend to bend and partially break rather than snap completely. The term is an analogy to a "green" (young) branch of a tree that bends and splinters on one side when stressed, rather than breaking into two distinct pieces. **Why Option D is Correct:** In a greenstick fracture, the bone undergoes **plastic deformation**. The cortex on the convex side (tension side) breaks, while the cortex and **periosteum on the concave side (compression side) remain intact** but often appear "crumpled" or buckled. This intact periosteal hinge provides stability to the fracture, though it can also make anatomical reduction difficult unless the bone is "completed" (broken fully) during manipulation. **Analysis of Incorrect Options:** * **Option A:** These are seen in **children**, not the elderly. Elderly bones are brittle and prone to comminuted or osteoporotic fractures. * **Option B:** A **Fatigue (Stress) fracture** results from repetitive submaximal loading on normal bone (e.g., March fracture in recruits), not a single traumatic bending force. * **Option C:** A **Spiral fracture** is a complete fracture caused by a rotational/twisting force, common in long bones but distinct from the incomplete nature of a greenstick injury. **High-Yield Clinical Pearls for NEET-PG:** * **Common Site:** Forearm (Radius and Ulna). * **Management:** Often requires closed reduction. If the deformity is significant, the surgeon may need to "complete" the fracture to prevent the intact periosteum from pulling the bone back into a malaligned position (recoil). * **Related Pediatric Fracture:** **Torus (Buckle) fracture**, where the cortex bulges due to axial loading without any visible break in the cortex.

Question 1

What deformity is typically seen in a posterior elbow dislocation?

Accepted Answer

Flexion

Answer

Extension

Answer

Medial deviation

Answer

Lateral deviation

Question 2

Dislocation without fracture is most commonly seen in which part of the spine?

Accepted Answer

Cervical spine

Answer

Sacral spine

Answer

Lumbar spine

Answer

Thoracic spine

Question 3

What is a straddle fracture?

Accepted Answer

Pelvic fracture

Answer

Fracture of the skull

Answer

Fracture of the C5 vertebra

Answer

Multiple rib fractures on both sides of the midline

Question 4

Which of the following statements is NOT true regarding anterior dislocation of the hip?

Accepted Answer

Associated with shortening of the limb.

Answer

Femoral nerve is more commonly injured.

Answer

The limb is rotated laterally.

Answer

Associated with lengthening of the limb.

Question 5

Which of the following fractures can cause cubitus varus deformity as a complication?

Accepted Answer

Supracondylar fracture of the humerus

Answer

Fracture of the lateral condyle of the humerus

Answer

Fracture of the radial head

Answer

Chronic osteomyelitis

Question 6

A 4-year-old child sustained a fall on an outstretched hand. X-rays revealed a fracture line at the physis with a small metaphyseal fragment. There was no epiphyseal fracture. What type of injury is this according to the Salter-Harris Classification?

Accepted Answer

Type II

Answer

Type I

Answer

Type III

Answer

Type IV

Question 7

All of the following are types of avascular nonunion of fracture except?

Accepted Answer

Oligotrophic nonunion

Answer

Torsion wedge nonunion

Answer

Comminuted nonunion

Answer

Defect nonunion

Question 8

A 32-year-old biker sustained an injury over his left hip joint. X-ray revealed a posterior dislocation of the right hip joint. What is the clinical attitude of the affected lower limb?

Accepted Answer

Internal rotation, flexion, and adduction

Answer

External rotation, extension, and abduction

Answer

Internal rotation, extension, and abduction

Answer

External rotation, flexion, and abduction

Question 9

What is a green-stick fracture?

Accepted Answer

Periosteum of cortex is intact and periosteum is crumpled

Answer

Seen mostly in the elderly

Answer

Fatigue fracture

Answer

Spiral fracture of long bone

Question 10

What is the treatment of choice in a fracture neck of femur in a 40-year-old male presenting after 2 days?

Accepted Answer

Closed reduction and internal fixation by cancellous screws

Answer

Hemiarthroplasty

Answer

Closed reduction and internal fixation by Austin Moore pins

Answer

Plaster and rest

Trauma — MCQs

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