Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 241: What is a known complication of a humeral lateral epicondyle fracture?

A. Nonunion
B. Tardy ulnar nerve palsy
C. Cubitus valgus deformity
D. All of the above (Correct Answer)

Explanation: **Explanation:** Fractures of the lateral condyle (often referred to as lateral epicondyle fractures in clinical scenarios) are notorious for being **"fractures of deception"** because they are intra-articular and prone to significant complications if not managed with anatomical reduction. **Why "All of the Above" is Correct:** 1. **Nonunion:** This is the most common complication. The fracture fragment is often rotated and pulled by the common extensor muscles. Furthermore, the fragment is bathed in synovial fluid, which contains fibrinolysins that inhibit clot formation and primary bone healing, leading to a high rate of nonunion. 2. **Cubitus Valgus Deformity:** If nonunion occurs, the lateral condyle fails to grow or migrates proximally. As the medial side of the humerus continues to grow normally, the elbow develops a progressive lateral deviation, known as cubitus valgus. 3. **Tardy Ulnar Nerve Palsy:** This is a late (tardy) complication resulting from the cubitus valgus deformity. The valgus angulation increases the distance the ulnar nerve must travel around the medial epicondyle, causing chronic stretching and friction, eventually leading to ulnar neuropathy years after the initial injury. **High-Yield Clinical Pearls for NEET-PG:** * **Milch Classification:** Used to categorize these fractures based on whether the fracture line passes medial or lateral to the trochlear groove. * **Management:** Displaced fractures (>2mm) require **Open Reduction and Internal Fixation (ORIF)** with K-wires or screws to prevent the aforementioned complications. * **Contrast with Supracondylar Fractures:** While supracondylar fractures commonly lead to *cubitus varus* (Gunstock deformity), lateral condyle fractures lead to *cubitus valgus*.

Question 242: A young boy presents with a swollen knee after sustaining a blow to the lateral aspect of the knee with a twist during play. Joint line tenderness is present. The Anterior Drawer test is negative. X-ray shows no fracture. Which structure is most likely damaged?

A. Anterior Cruciate Ligament (ACL)
B. Medial Meniscus (Correct Answer)
C. Posterior Cruciate Ligament (PCL)
D. Lateral Meniscus

Explanation: **Explanation:** The clinical presentation of a **twisting injury** followed by **joint line tenderness** is a classic indicator of a meniscal tear. In this scenario, a blow to the lateral aspect of the knee creates a **valgus stress**, which stretches the medial compartment, making the **Medial Meniscus** the most likely structure to be damaged. * **Why Medial Meniscus is correct:** The medial meniscus is less mobile than the lateral meniscus because it is firmly attached to the deep part of the Medial Collateral Ligament (MCL). This lack of mobility makes it more prone to injury during rotational or valgus forces. Joint line tenderness is the most sensitive physical finding for meniscal tears. * **Why ACL is incorrect:** While ACL tears also occur with twisting injuries, the **Anterior Drawer test** (and Lachman test) would typically be positive. The question specifically states the Anterior Drawer test is negative. * **Why PCL is incorrect:** PCL injuries usually result from a direct blow to the proximal tibia (dashboard injury) or extreme hyperextension. They present with a positive Posterior Drawer or Sag sign. * **Why Lateral Meniscus is incorrect:** A valgus force (blow to the lateral side) stresses the medial side. The lateral meniscus is more mobile and less frequently injured than the medial meniscus in this mechanism. **Clinical Pearls for NEET-PG:** * **O’Donoghue’s Triple (Unhappy Triad):** Simultaneous injury to the ACL, MCL, and Medial Meniscus. * **McMurray’s Test:** Used to diagnose meniscal tears (External rotation for Medial Meniscus; Internal rotation for Lateral Meniscus). * **Golden Rule:** ACL tears present with rapid onset swelling (haemarthrosis), whereas meniscal tears often present with delayed swelling (traumatic synovitis) and "locking" of the joint.

Question 243: Volkmann's ischemic contracture is associated with which of the following conditions?

A. Intertrochanteric femoral fracture
B. Supracondylar fracture of the humerus (Correct Answer)
C. Posterior dislocation of the knee
D. Traumatic shoulder separation

Explanation: **Explanation:** **Volkmann’s Ischemic Contracture (VIC)** is the late-stage sequela of untreated **Acute Compartment Syndrome**, typically occurring in the forearm. **Why Option B is Correct:** The **Supracondylar fracture of the humerus** (specifically the extension type) is the most common cause of VIC in children. The mechanism involves injury to the **brachial artery** or intense swelling within the tight fascial compartments of the forearm. Ischemia leads to muscle infarction and subsequent fibrosis. The classic clinical picture is a permanent flexion deformity of the wrist and fingers (claw-hand) due to the shortening of the fibrotic flexor muscles (primarily Flexor Digitorum Profundus and Flexor Pollicis Longus). **Why Other Options are Incorrect:** * **Option A:** Intertrochanteric fractures occur in a large space with significant volume capacity; while they cause blood loss, they rarely lead to compartment syndrome or ischemic contracture. * **Option C:** Posterior dislocation of the knee can damage the **popliteal artery**, leading to limb ischemia or compartment syndrome of the leg, but the specific eponymous term "Volkmann’s Ischemic Contracture" is traditionally reserved for the forearm. * **Option D:** Traumatic shoulder separation (Acromioclavicular joint injury) involves ligamentous damage and does not compromise the distal neurovascular status of the limb. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign:** Pain out of proportion to the injury and pain on passive stretching of muscles. * **The 5 P’s:** Pain, Pallor, Pulselessness, Paresthesia, and Paralysis (Note: Pulselessness is a *late* sign). * **Nerve Involvement:** The **Median nerve** is the most commonly affected nerve in VIC. * **Treatment:** Immediate removal of tight bandages/casts; if no improvement, urgent **fasciotomy** is required to prevent permanent contracture.

Question 244: What is the most common complication of a supracondylar fracture of the humerus?

A. Malunion (Correct Answer)
B. Median nerve injury
C. Myositis ossificans
D. Volkmann's ischemic contracture

Explanation: **Explanation:** Supracondylar fractures of the humerus are the most common pediatric elbow fractures. **1. Why Malunion is the Correct Answer:** Malunion, specifically resulting in **Cubitus Varus (Gunstock Deformity)**, is the **most common complication** overall. It occurs due to inadequate reduction or loss of reduction, leading to a coronal plane deformity. While it is often a cosmetic issue rather than a functional one, its high incidence rate makes it the most frequent complication seen in clinical practice. **2. Analysis of Incorrect Options:** * **Median Nerve Injury:** This is the **most common neurological complication** (specifically the Anterior Interosseous Nerve/AIN), but it occurs less frequently than malunion. * **Myositis Ossificans:** This is a rare complication in supracondylar fractures. It is more commonly associated with posterior elbow dislocations or forceful passive stretching/massage following an injury. * **Volkmann’s Ischemic Contracture (VIC):** This is the **most serious/dreaded complication**, resulting from untreated Compartment Syndrome (brachial artery injury or swelling). While high-yield for exams, its actual incidence is low (<1%) due to modern surgical urgency. **Clinical Pearls for NEET-PG:** * **Most common nerve injured:** Median nerve (specifically **AIN**—test by asking the patient to make an "OK" sign). * **Nerve injured in Extension type:** Median/Radial nerve. * **Nerve injured in Flexion type:** Ulnar nerve. * **Gartland Classification** is used to grade these fractures (Type I: Undisplaced; Type II: Displaced with intact posterior cortex; Type III: Completely displaced). * **Baumann’s Angle:** Used radiologically to assess the adequacy of reduction and predict future varus deformity.

Question 245: McMurray's test is positive in which of the following injuries?

A. Anterior cruciate ligament
B. Posterior cruciate ligament
C. Medial meniscus injury (Correct Answer)
D. Popliteal bursitis

Explanation: **Explanation:** **McMurray’s test** is a clinical provocative maneuver used to diagnose **meniscal tears**. The test relies on the principle that rotating the tibia while extending the knee traps the torn meniscal fragment between the femoral condyle and the tibial plateau, eliciting a painful "click" or "thud." * **Why Option C is correct:** To test the **medial meniscus**, the examiner flexes the patient's knee, applies a **valgus stress** (to open the joint space), and **externally rotates** the tibia while slowly extending the knee. A positive test is indicated by a palpable or audible click over the medial joint line. * **Why Options A & B are incorrect:** Ligamentous injuries are assessed using different maneuvers. The **Anterior Cruciate Ligament (ACL)** is evaluated via the Lachman test (most sensitive), Anterior Drawer test, and Pivot Shift test. The **Posterior Cruciate Ligament (PCL)** is evaluated via the Posterior Drawer test and the Sag sign. * **Why Option D is incorrect:** Popliteal bursitis (Baker’s cyst) typically presents as a swelling in the popliteal fossa and is not diagnosed through rotational provocative maneuvers. **Clinical Pearls for NEET-PG:** 1. **Rotation Rule:** **E**xternal rotation tests the **M**edial meniscus (**EM**), while **I**nternal rotation tests the **L**ateral meniscus (**IL**). 2. **Thessaly Test:** Currently considered the most clinically accurate physical exam test for meniscal tears (performed with the patient standing on one leg at 20° flexion). 3. **Apley’s Grinding Test:** Another common test for meniscal injury; distraction relieves pain in meniscal tears but increases pain in ligamentous injuries. 4. **Gold Standard:** MRI is the investigation of choice, but Arthroscopy remains the gold standard for diagnosis.

Question 246: Tinel's sign is positive in which of the following conditions?

A. Peripheral nerve regeneration (Correct Answer)
B. Tendon injury
C. Tenosynovitis
D. Rheumatoid arthritis

Explanation: **Explanation:** **Tinel’s sign** is a clinical indicator of **peripheral nerve regeneration**. It is elicited by percussing along the course of a damaged nerve. A positive sign is characterized by a "pins and needles" or tingling sensation (paresthesia) felt in the distal distribution of the nerve. 1. **Why Option A is correct:** When a peripheral nerve undergoes regeneration after injury, the newly formed, unmyelinated axonal sprouts are highly sensitive to mechanical stimulation. Tapping over these regenerating fibers triggers an electrical discharge. As the nerve heals, the point where the tingling is elicited moves distally (towards the periphery), allowing clinicians to track the rate of nerve recovery (typically **1 mm/day**). 2. **Why other options are incorrect:** * **Tendon injury & Tenosynovitis:** These involve musculoskeletal structures, not neural tissue. While they cause localized pain or "triggering," they do not produce the distal paresthesia characteristic of Tinel's sign. * **Rheumatoid arthritis:** This is an inflammatory systemic joint disease. While RA can lead to nerve compression (like Carpal Tunnel Syndrome), the sign itself specifically denotes nerve irritability or regeneration, not the underlying arthritic process. **High-Yield Clinical Pearls for NEET-PG:** * **Hoffmann-Tinel Sign:** Another name for Tinel's sign. * **Carpal Tunnel Syndrome (CTS):** A positive Tinel’s sign at the wrist indicates median nerve compression. * **Prognostic Value:** A "distally progressing" Tinel’s sign is a good prognostic indicator of recovery. If the sign remains fixed at the site of injury, it suggests a **neuroma** or lack of regeneration. * **Order of Recovery:** In nerve healing, **Pain** (Sympathetic) recovers first, followed by **Tinel's sign**, then **Touch**, and finally **Motor function**.

Question 247: What is the appropriate treatment modality for an 8-year-old child with a unilateral condylar fracture presenting with chronic pain and normal occlusion?

A. Intermaxillary fixation (IMF) for 2 weeks
B. Intermaxillary fixation (IMF) for 4 weeks
C. Active jaw movements (Correct Answer)
D. Open reduction

Explanation: **Explanation:** The management of pediatric condylar fractures is primarily **conservative**, prioritizing the restoration of function and the prevention of ankylosis over anatomical reduction. **Why "Active Jaw Movements" is correct:** In children, the condyle has a high osteogenic potential and remarkable remodeling capacity. For a patient with **normal occlusion**, the goal is to maintain the range of motion. Early mobilization (active jaw exercises) prevents the formation of intra-articular adhesions and promotes functional remodeling of the condylar head. Since the occlusion is stable, there is no need for immobilization. **Analysis of Incorrect Options:** * **A & B (IMF for 2 or 4 weeks):** Intermaxillary fixation (IMF) is generally avoided in children unless there is significant malocclusion. Prolonged immobilization (especially 4 weeks) in a growing child significantly increases the risk of **temporomandibular joint (TMJ) ankylosis** and growth disturbances. If IMF is used for minor occlusal discrepancies, it is limited to a very short period (7–10 days). * **D (Open Reduction):** Surgical intervention is rarely indicated in children due to the risk of damaging the growth center and the high success rate of conservative management. It is reserved for absolute indications like displacement into the middle cranial fossa or mechanical interference with opening. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of mandible fracture in children:** Condyle (due to the high vascularity and thin neck). * **Treatment of choice for pediatric condylar fractures:** Conservative (Observation + Soft diet + Active mobilization). * **Complication of neglected/improperly treated fracture:** TMJ Ankylosis, leading to "Bird-face deformity" (micrognathia). * **Remodeling:** The younger the child, the greater the potential for the condyle to "re-grow" and adapt to its functional position.

Question 248: Vascular necrosis can be a possible sequelae of fracture of all of the following bones, EXCEPT:

A. Talus
B. Femur neck
C. Scaphoid
D. Calcaneum (Correct Answer)

Explanation: **Explanation:** Avascular Necrosis (AVN) occurs when the blood supply to a bone is disrupted, leading to bone cell death. This typically occurs in bones that have a **precarious blood supply**, often characterized by a retrograde flow or a lack of significant muscular attachments and collateral circulation. **Why Calcaneum is the Correct Answer:** The **Calcaneum** is a highly vascular bone with a rich blood supply derived from multiple sources (medial and lateral plantar arteries and the calcaneal anastomosis). It is composed primarily of cancellous bone. Due to this robust vascularity, AVN is virtually never seen following a calcaneal fracture. Instead, the most common complication of calcaneal fractures is post-traumatic arthritis of the subtalar joint. **Analysis of Other Options:** * **Talus:** The talus is notorious for AVN (Hawkins’ Sign is used to predict it). It is 60% covered by articular cartilage and has no muscular attachments. The blood supply (mainly via the artery of the tarsal canal) is easily disrupted in neck fractures. * **Femur Neck:** The femoral head relies on the retrograde flow from the medial circumflex femoral artery. Intracapsular fractures disrupt these vessels, making AVN a very high-risk complication. * **Scaphoid:** The scaphoid has a retrograde blood supply entering through the distal pole. A fracture at the waist or proximal pole cuts off the blood to the proximal fragment, leading to a high incidence of AVN. **NEET-PG Clinical Pearls:** * **Common sites for AVN:** Head of femur (most common), proximal pole of scaphoid, body of talus, and capitate. * **Hawkins’ Sign:** Subchondral lucency in the talus seen 6–8 weeks post-fracture; its presence indicates intact vascularity (a good prognostic sign). * **Preiser’s Disease:** Idiopathic AVN of the scaphoid. * **Kohler’s Disease:** AVN of the navicular bone in children.

Question 249: What is a late complication of an acetabular fracture?

A. Avascular necrosis of iliac crest
B. Avascular necrosis of head of femur (Correct Answer)
C. Fixed deformity of the hip joint
D. Secondary osteoarthritis of hip joint

Explanation: **Explanation:** Acetabular fractures are high-energy injuries that often involve significant trauma to the hip joint. **Avascular Necrosis (AVN) of the femoral head** is a classic late complication, occurring in approximately 5-10% of cases. This occurs because the initial trauma (often a posterior dislocation associated with the fracture) or the surgical approach can disrupt the precarious blood supply to the femoral head, primarily the medial circumflex femoral artery. **Analysis of Options:** * **A. AVN of iliac crest:** This is incorrect. The iliac crest has a robust, multi-source blood supply and is not a weight-bearing articular surface prone to necrosis following acetabular trauma. * **C. Fixed deformity:** While stiffness can occur, a "fixed deformity" is more characteristic of untreated chronic dislocations or advanced tuberculosis of the hip rather than a standard late complication of an acetabular fracture itself. * **D. Secondary osteoarthritis:** This is a very common late complication (often more common than AVN). However, in the context of standard PG entrance exams, if both are listed, AVN is frequently highlighted as the specific vascular complication resulting from the associated hip dislocation/trauma. *Note: In clinical practice, osteoarthritis is the most frequent long-term sequel.* **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Dashboard injury (Force transmitted through the femur). * **Most common late complication:** Secondary Osteoarthritis (due to articular surface irregularity). * **Most common nerve injured:** Sciatic nerve (specifically the peroneal division), especially in posterior wall fractures. * **Judet-Letournel Classification:** The gold standard for classifying these fractures. * **Radiology:** Requires AP view of the pelvis plus **Judet Views** (Iliac oblique and Obturator oblique).

Question 250: Which of the following tests is positive in anterior dislocation of the shoulder?

A. Thomas test
B. Barlow's test
C. McMurry's test
D. Duga's test (Correct Answer)

Explanation: **Explanation:** **Duga’s Test** is a classic clinical sign used to diagnose **Anterior Dislocation of the Shoulder**. In a normal shoulder, a person can touch the opposite shoulder with their hand while the elbow is in contact with the chest wall. In anterior dislocation, the humeral head is displaced from the glenoid cavity, making it mechanically impossible to touch the opposite shoulder while the elbow is adducted against the chest. **Analysis of Incorrect Options:** * **Thomas Test:** Used to assess **fixed flexion deformity (FFD) of the hip**. It involves flexing the contralateral hip to flatten lumbar lordosis; if the affected thigh rises off the table, the test is positive. * **Barlow’s Test:** A provocative maneuver used in **Developmental Dysplasia of the Hip (DDH)**. It attempts to dislocate a reducible hip by adducting the hip and applying a posterior force. * **McMurray’s Test:** Used to diagnose **meniscal tears** in the knee. It involves rotation of the tibia on the femur while extending the knee from a flexed position. **High-Yield Clinical Pearls for NEET-PG:** 1. **Other Tests for Shoulder Dislocation:** * **Hamilton Ruler Test:** A straight ruler can touch both the acromion and the lateral epicondyle simultaneously (impossible in a normal shoulder). * **Callaway’s Test:** The vertical axillary girth is increased. 2. **Most Common Type:** Anterior dislocation is the most common (Subcoracoid is the most frequent subtype). 3. **Nerve Injury:** The **Axillary nerve** is the most commonly injured nerve in anterior shoulder dislocations (tested by checking sensation over the "Regimental Badge" area). 4. **Radiology:** Look for the **Hill-Sachs lesion** (posterolateral humeral head defect) and **Bankart’s lesion** (anteroinferior glenoid labrum tear).

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Open Fractures

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Fractures in Children

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Fracture Complications

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Trauma — MCQs

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