Trauma Practice Questions

Q: What is the treatment for an undisplaced fracture of the patella?

Tube cast. **Explanation:** The primary goal in managing patellar fractures is to restore the extensor mechanism of the knee and ensure articular congruity. **Why Option A is Correct:** An **undisplaced fracture** is defined by less than 2mm of articular step-off and less than 3mm of fragment separation. In such cases, the extensor expansion (medial and lateral retinacula) remains intact, meaning the patient can actively extend the knee. Conservative management is indicated, typically using a **Cylindrical (Tube) cast** or a long knee brace for 4–6 weeks. This immobilizes the joint in extension, allowing the fracture to heal while preventing displacement by the quadriceps pull. **Why Other Options are Incorrect:** * **B. Nailing:** Intramedullary nailing is not a standard procedure for patellar fractures due to the bone's unique anatomy and subcutaneous location. * **C. Tension Band Wiring (TBW):** This is the **gold standard for displaced** transverse patellar fractures. It converts tensile forces from the quadriceps into compressive forces across the fracture site. It is unnecessary for undisplaced fractures. * **D. Observation:** While the fracture is undisplaced, it is unstable under the physiological pull of the quadriceps. Simple observation without immobilization risks displacement and failure of the extensor mechanism. **High-Yield Clinical Pearls for NEET-PG:** * **Indications for Surgery:** Displacement >3mm or articular step-off >2mm, or a disrupted extensor mechanism (inability to perform a Straight Leg Raise). * **Modified TBW:** Uses two parallel K-wires and a stainless steel wire in a "figure-of-eight" fashion. * **Patellectomy:** Reserved for severely comminuted (shattered) fractures where reconstruction is impossible (Stellate fractures). * **Radiology:** The **Sunrise view** (Axial view) is best for visualizing vertical fractures, while the Lateral view is best for transverse fractures.

Q: Which fracture in children is commonly associated with vascular injury?

Lower end of humerus. **Explanation:** The correct answer is **Lower end of humerus**, specifically the **Supracondylar fracture of the humerus**. This is the most common fracture in children (peaking at ages 5–8) and is notorious for its association with vascular complications. **Why it is correct:** In the common **extension-type** supracondylar fracture, the proximal fracture fragment is displaced anteriorly. This sharp edge can easily impinge upon or lacerate the **Brachial Artery**, which lies directly anterior to the distal humerus. This can lead to an absent radial pulse, and if left untreated, results in **Volkmann’s Ischemic Contracture (VIC)** due to compartment syndrome. **Why the other options are incorrect:** * **Lower end of radius:** While common (e.g., Colles' in adults or distal physeal injuries in children), it is rarely associated with major vascular injury; median nerve involvement is more common. * **Upper end of femur:** These are rare in children and are more significantly associated with **Avascular Necrosis (AVN)** of the femoral head due to disruption of the circumflex vessels, rather than acute limb-threatening vascular trauma. * **Upper end of radius:** Radial neck fractures in children are common, but they typically involve the radial nerve (posterior interosseous branch) rather than major arteries. **Clinical Pearls for NEET-PG:** * **Most common nerve injured:** Median nerve (specifically the **Anterior Interosseous Nerve**). * **Nerve injured in flexion-type:** Ulnar nerve. * **Gartland Classification** is used to grade these fractures. * **Pink Pulseless Hand:** A clinical scenario where the hand is perfused (capillary refill <2s) but the radial pulse is absent; it requires urgent orthopedic consultation. * **Deformity:** Malunion often leads to **Cubitus Varus** (Gunstock deformity).

Q: Baon's fracture is defined as which of the following?

Fracture of the distal end of the humerus. **Explanation:** **Bacon’s fracture** (often spelled as Baon's in some regional texts) refers to a specific fracture involving the **distal end of the humerus**, typically involving the articular surface or the condyles. In the context of orthopedic nomenclature, it is a high-yield, eponymous term used to describe injuries in this region, though it is less commonly cited in modern Western textbooks compared to Supracondylar or Kocher-Lorenz fractures. **Analysis of Options:** * **Option A (Correct):** Bacon’s fracture is defined as a fracture of the distal humerus. Understanding distal humerus anatomy is crucial for NEET-PG, as these fractures often carry a risk of brachial artery or median/radial nerve injury. * **Option B (Incorrect):** An extra-articular fracture of the distal radius with dorsal displacement is a **Coles’ fracture**, while volar displacement is a **Smith’s fracture**. * **Option C (Incorrect):** A simple intra-articular fracture of the distal radius is generally classified under the **Frykman classification** or as part of complex radial styloid fractures (Chauffeur's). * **Option D (Incorrect):** An intra-articular fracture of the distal radius associated with carpal subluxation is known as a **Barton’s fracture** (Dorsal or Volar). **High-Yield Clinical Pearls for NEET-PG:** 1. **Distal Humerus:** Always check for the "Three-point bony relationship" (Olecranon, Medial, and Lateral Epicondyles). It is maintained in supracondylar fractures but disturbed in elbow dislocations. 2. **Barton’s vs. Smith’s:** Barton’s is always **intra-articular** with subluxation; Smith’s is typically **extra-articular**. 3. **Chauffeur’s Fracture:** An isolated fracture of the radial styloid process. 4. **Hutchinson’s Fracture:** Another name for Chauffeur’s fracture.

Q: Complications of Colles' fracture include all EXCEPT:

Gunstock deformity. **Explanation:** The correct answer is **Gunstock deformity** because it is a characteristic complication of **Supracondylar fracture of the humerus**, not Colles' fracture. Gunstock deformity (cubitus varus) occurs due to the malunion of the distal humerus, leading to a decrease in the carrying angle of the elbow. **Analysis of Options:** * **Malunion (Option A):** This is the **most common complication** of Colles' fracture. It typically results in a "Dinner Fork Deformity" due to the dorsal tilt and radial shortening of the distal radius. * **Carpal Tunnel Syndrome (Option B):** Acute median nerve compression can occur due to excessive edema or hematoma within the carpal tunnel, or chronically due to bony irregularities following malunion. * **Shoulder-hand Syndrome (Option C):** Also known as Reflex Sympathetic Dystrophy (CRPS Type 1), this is a distressing complication characterized by pain, swelling, and stiffness of the hand and shoulder, often triggered by prolonged immobilization or tight casting. **High-Yield Clinical Pearls for NEET-PG:** 1. **Eponymous Deformity:** Colles' fracture presents with a **Dinner Fork Deformity**. 2. **Most Common Complication:** Malunion. 3. **EPL Rupture:** Spontaneous rupture of the **Extensor Pollicis Longus (EPL)** tendon is a classic late complication (usually 4–8 weeks post-injury) due to ischemia or friction at Lister’s tubercle. 4. **Sudeck’s Atrophy:** Another name for the vasomotor complications (CRPS) associated with this fracture. 5. **Reverse Colles:** Known as **Smith’s fracture**, where the distal fragment is displaced volarly (Garden Spade deformity).

Q: Which of the following conditions does not involve nerve damage?

Volkmann's contracture. **Explanation:** The correct answer is **Volkmann’s Ischemic Contracture (VIC)** because it is primarily a **vascular and muscular pathology**, not a direct nerve injury. 1. **Why Volkmann’s Contracture is correct:** VIC is the late-stage sequela of untreated **Compartment Syndrome**, most commonly following a supracondylar fracture of the humerus. The underlying mechanism is **ischemic necrosis of the forearm muscles** (specifically the deep flexors like Flexor Digitorum Profundus and Flexor Pollicis Longus). While nerves may be compressed due to high compartment pressure, the "contracture" itself is the result of muscle infarct being replaced by fibrous tissue. 2. **Why the other options are incorrect:** * **Guillain-Barré Syndrome (GBS):** An acute inflammatory demyelinating polyradiculoneuropathy. It involves autoimmune destruction of the **myelin sheath of peripheral nerves**. * **Erb’s Paralysis:** A lower motor neuron lesion resulting from damage to the **upper trunk of the brachial plexus (C5-C6)**, typically due to birth trauma or traction. * **Neurotmesis:** The most severe grade of nerve injury (Seddon’s classification) involving **complete physiological and anatomical disruption** of the nerve and its connective tissue sheath. **NEET-PG High-Yield Pearls:** * **Classic Sign of VIC:** Volkmann’s sign (passive extension of fingers is painful and limited; fingers can only be extended when the wrist is flexed). * **Earliest Sign of Compartment Syndrome:** Pain out of proportion to the injury and pain on passive stretching of muscles. * **Nerve most commonly involved in VIC:** Median nerve (due to its deep location in the forearm). * **Order of tissue sensitivity to ischemia:** Nerve (6 hours) > Muscle (8 hours) > Bone.

Q: What is the most commonly dislocated joint in the body?

Shoulder. **Explanation:** The **Shoulder joint (Glenohumeral joint)** is the most commonly dislocated joint in the body. This is primarily due to its unique anatomy: it is a "ball-and-socket" joint characterized by a large humeral head and a disproportionately small, shallow glenoid cavity (often compared to a golf ball on a tee). While this configuration allows for the greatest range of motion of any joint, it inherently sacrifices stability, making it highly susceptible to displacement. **Analysis of Options:** * **Shoulder (Correct):** Approximately 50% of all major joint dislocations involve the shoulder. The **Anterior** type is the most frequent (95%). * **Hip:** This is a very stable, deep ball-and-socket joint reinforced by strong ligaments (like the Bigelow ligament). Dislocation usually requires high-energy trauma, such as a dashboard injury in a motor vehicle accident. * **Elbow:** This is the **most common dislocation in children**, but it ranks second to the shoulder in adults. It is typically a posterior dislocation. * **Knee:** True tibiofemoral dislocations are rare and represent a surgical emergency due to the high risk of popliteal artery injury. (Note: Patellar dislocations are more common than knee dislocations but less common than shoulder dislocations). **High-Yield Clinical Pearls for NEET-PG:** * **Most common direction:** Anterior (Subcoracoid is the most common subtype). * **Nerve at risk:** Axillary nerve (tested by sensation over the "Regimental Badge" area). * **Associated Lesions:** Bankart lesion (avulsion of anterior-inferior labrum) and Hill-Sachs lesion (compression fracture of posterolateral humeral head). * **Recurrence:** The younger the patient at the time of first dislocation, the higher the risk of recurrence.

Q: In a patient, a fracture leads to loss of intermediate bone between the fractured segment of the mandible. In this condition, which of the following fixation plates should be applied?

Load bearing plate.. **Explanation:** The core concept in choosing a fixation plate for mandibular fractures depends on the **integrity of the bone ends** and their ability to share the functional load. **1. Why "Load Bearing Plate" is correct:** In cases where there is a **loss of intermediate bone** (comminuted fractures, bone defects, or atrophic mandibles), the fractured segments cannot touch or support each other. Therefore, the bone cannot share any of the functional load (mastication). In such scenarios, the hardware must be strong enough to withstand 100% of the functional forces without any help from the bone. A **Load Bearing Plate** (typically a large, thick reconstruction plate) acts as a bridge, bearing the entire stress across the gap. **2. Why other options are incorrect:** * **Load Sharing Plate:** These are used when there is sufficient bone-to-bone contact at the fracture site (e.g., simple linear fractures). Here, the plate and the bone share the functional load together. Examples include miniplates (Champy’s technique) or compression plates. Since there is a "loss of intermediate bone" in the question, load sharing is impossible. * **Load Distributing Plate:** This is not a standard biomechanical term used in maxillofacial or orthopedic fixation classification. * **Any of the above:** Incorrect because the biomechanical requirement specifically demands a load-bearing construct due to the lack of bony support. **Clinical Pearls for NEET-PG:** * **Champy’s Technique:** Uses non-compression miniplates placed along the "ideal lines of tension" (Load sharing). * **Compression Plates:** Create "active" load sharing by pressing bone ends together. * **Reconstruction Plates:** The classic example of **Load Bearing** fixation; used in continuity defects, comminuted fractures, and infected non-unions.

Question 1

What is the treatment for an undisplaced fracture of the patella?

Accepted Answer

Tube cast

Answer

Nailing

Answer

Tension band wiring

Answer

Observation

Question 2

An elderly woman was admitted with a fracture of the neck of the right femur which failed to unite. On examination, avascular necrosis of the head of the femur was noted. The condition most probably resulted from damage to which of the following?

Accepted Answer

Retinacular branches of the circumflex femoral arteries

Answer

Superior gluteal artery

Answer

Inferior gluteal artery

Answer

Acetabular branch of the obturator artery

Question 3

Which fracture in children is commonly associated with vascular injury?

Accepted Answer

Lower end of humerus

Answer

Lower end of radius

Answer

Upper end of femur

Answer

Upper end of radius

Question 4

The telescopic test is useful to diagnose which of the following conditions?

Accepted Answer

Intracapsular fracture neck of femur

Answer

Pehes disease

Answer

Malunited trochanteric fracture

Answer

Ankylosis of hip joint

Question 5

Baon's fracture is defined as which of the following?

Accepted Answer

Fracture of the distal end of the humerus

Answer

Extra-articular fracture of the distal end of the radius

Answer

Intra-articular fracture of the distal end of the radius

Answer

Intra-articular fracture of the distal end of the radius with carpal bone subluxation

Question 6

Complications of Colles' fracture include all EXCEPT:

Accepted Answer

Gunstock deformity

Answer

Malunion

Answer

Carpal tunnel syndrome

Answer

Shoulder-hand syndrome

Question 7

Which of the following conditions does not involve nerve damage?

Accepted Answer

Volkmann's contracture

Answer

Guillain-Barré syndrome

Answer

Erb's paralysis

Answer

Neurotmesis

Question 8

A 60-year-old woman suffers a fall. Her lower limb is extended and externally rotated. What is the likely diagnosis?

Accepted Answer

Neck of femur fracture

Answer

Intertrochanteric femur fracture

Answer

Posterior dislocation of the hip

Answer

Anterior dislocation of the hip

Question 9

What is the most commonly dislocated joint in the body?

Accepted Answer

Shoulder

Answer

Hip

Answer

Elbow

Answer

Knee

Question 10

In a patient, a fracture leads to loss of intermediate bone between the fractured segment of the mandible. In this condition, which of the following fixation plates should be applied?

Accepted Answer

Load bearing plate.

Answer

Load shearing plate.

Answer

Load distributing plate.

Answer

Any of the above.

Trauma — MCQs

Trauma — MCQs

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