Trauma Practice Questions

Q: In an open injury during toileting and debridement, what indicates muscle viability?

Muscle contractility. In the management of open fractures, assessing muscle viability is critical during surgical debridement to prevent infection and gas gangrene. The standard clinical assessment follows the **"4 Cs" rule**. ### Why "Muscle Contractility" is the Correct Answer While all 4 Cs are used, **contractility** (the muscle’s ability to contract when stimulated by a forceps or diathermy) is considered the **most reliable and objective clinical indicator** of muscle viability. A muscle that contracts has an intact motor end-plate and sufficient physiological reserve, suggesting it can recover. ### Explanation of Incorrect Options * **A. Colour:** While healthy muscle is typically beefy red, colour is the **least reliable** indicator. Muscle may appear bruised or pale due to local trauma or surface oxidation but still be viable. * **C. Punctate bleeding:** Bleeding indicates intact microcirculation. While a very strong sign of viability, it can sometimes be misleading if there is passive venous congestion or if the patient is hypotensive. * **D. Muscle function:** This refers to the patient’s ability to actively move the limb. In an acute trauma setting, muscle function cannot be assessed due to pain, nerve injury, or the use of anesthesia/muscle relaxants during surgery. ### Clinical Pearls for NEET-PG: The "4 Cs" of Muscle Viability When performing debridement, surgeons evaluate these four criteria (ranked from most to least reliable): 1. **Contractility:** Response to stimulus (Most reliable). 2. **Capillary Bleeding:** Punctate bleeding when cut. 3. **Consistency:** Viable muscle is firm and resilient; dead muscle is friable/mushy. 4. **Colour:** Red vs. dark/dusky (Least reliable). **High-Yield Note:** If a muscle fails the contractility test, it is generally considered non-viable and should be excised to reduce the risk of *Clostridial* infections.

Q: Which of the following is NOT a component of the management of fat embolism syndrome?

Streptokinase therapy. **Explanation:** Fat Embolism Syndrome (FES) is a clinical diagnosis characterized by the triad of respiratory distress, neurological symptoms, and petechial rashes, typically occurring 24–72 hours after long bone fractures. **Why Streptokinase is the Correct Answer (NOT used):** Streptokinase is a thrombolytic agent used to dissolve blood clots (fibrin) in conditions like myocardial infarction or pulmonary thromboembolism. FES is caused by **fat globules** and the subsequent inflammatory response (free fatty acids), not by fibrin-based thrombi. Therefore, thrombolytics have no role and may increase the risk of bleeding in trauma patients. **Analysis of Other Options:** * **Oxygen Therapy:** This is the **most important** aspect of management. Maintaining arterial oxygenation (often requiring mechanical ventilation) is the mainstay of treatment as FES is self-limiting if the patient is supported through the respiratory crisis. * **Heparin Administration:** Historically used to clear lipemia by stimulating lipoprotein lipase. While its routine use is now controversial due to bleeding risks, it remains a documented (though secondary) pharmacological consideration in some protocols. * **Corticosteroids:** High-dose corticosteroids (e.g., Methylprednisolone) are used to reduce the inflammatory pulmonary edema and stabilize capillary membranes, although their prophylactic use is more evidence-based than therapeutic use. **High-Yield Clinical Pearls for NEET-PG:** * **Gurd’s Criteria:** Used for diagnosis (Major: Petechial rash, Respiratory insufficiency, CNS depression). * **Snowstorm Appearance:** Classic finding on Chest X-ray. * **Earliest Sign:** Tachycardia. * **Most Pathognomonic Sign:** Petechial rash (found in the conjunctiva, axilla, and neck). * **Prevention:** Early stabilization and internal fixation of long bone fractures is the best way to prevent FES.

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: 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: A 45-year-old male sustains a femur shaft fracture and is stabilized according to ATLS protocols. After 4 hours, he develops breathlessness with a PaO2 of 56 mmHg and is shifted to the ICU. What is the most likely complication?

ARDS. ### Explanation **Correct Option: A. ARDS (Acute Respiratory Distress Syndrome)** The patient presents with sudden onset hypoxemia (PaO2 < 60 mmHg) following a major long bone trauma (femur shaft fracture). While Fat Embolism Syndrome (FES) is a common consideration in this scenario, the **timing** is the key differentiator. FES typically presents with a "latent period" of **24–72 hours** post-injury. Respiratory distress occurring within the first few hours (hyperacute phase) is more characteristic of **ARDS** or early pulmonary contusion. In the context of NEET-PG, if a patient develops severe hypoxia shortly after trauma (within <12–24 hours), ARDS is the preferred diagnosis. **Why other options are incorrect:** * **B. Cardiac arrest:** While hypoxia can lead to arrest, it is a terminal event rather than the primary complication causing the breathlessness. * **C. Acute bronchial asthma:** There is no history of atopy or wheezing mentioned; the clinical context strongly points toward a trauma-related pulmonary complication. * **D. Fat embolism syndrome:** This is the most common distractor. FES classically presents with a triad of dyspnea, confusion, and petechial rashes, but it rarely manifests within 4 hours. It usually requires 1–3 days for the fat globules to cause a chemical pneumonitis. **Clinical Pearls for NEET-PG:** * **Gurd’s Criteria:** Used for FES diagnosis (Major: Petechial rash, Respiratory insufficiency, CNS depression). * **Snowstorm Appearance:** Classic X-ray finding in FES (though it appears late). * **Early Fixation:** The most effective way to prevent FES/ARDS in femur fractures is early stabilization (within 24 hours). * **PaO2/FiO2 Ratio:** A ratio <300 mmHg is diagnostic of ARDS (Berlin Criteria).

Q: Non-union occurs in the following fractures EXCEPT?

Trochanteric. ### Explanation The correct answer is **Trochanteric fracture**. **1. Why Trochanteric fractures rarely undergo non-union:** The intertrochanteric region of the femur is composed of **cancellous bone** with an excellent **extracapsular blood supply** and a large surface area for healing. Cancellous bone is highly vascular and possesses high osteogenic potential, leading to rapid union. Consequently, the primary complication of trochanteric fractures is **malunion** (usually in varus), rather than non-union. **2. Why the other options are prone to non-union:** The other three sites are classic examples of fractures prone to non-union due to specific anatomical vulnerabilities: * **Neck of Femur (Option A):** This is an **intracapsular** fracture. The synovial fluid contains fibrinolysins that inhibit clot formation. Furthermore, the blood supply (mainly via the retrograde retinacular vessels) is frequently disrupted, leading to avascular necrosis (AVN) and non-union. * **Scaphoid (Option B):** The scaphoid has a **retrograde blood supply** (entering via the distal pole). A fracture at the waist or proximal pole cuts off the blood supply to the proximal fragment, leading to AVN and a high incidence of non-union. * **Talus (Option C):** Like the scaphoid, the talus is largely covered by articular cartilage and has a precarious blood supply (entering mainly through the sinus tarsi and tarsal canal). Fractures of the neck of the talus often result in AVN and non-union (Hawkins Classification). **Clinical Pearls for NEET-PG:** * **Common sites for Non-union:** Neck of femur, Scaphoid, Talus, Lower 1/3rd of Tibia, and Shaft of Humerus. * **Common site for Malunion:** Intertrochanteric fracture, Colles' fracture, and Supracondylar fracture of the humerus. * **Key Concept:** Intracapsular fractures are generally more prone to non-union than extracapsular fractures due to the lack of a periosteal sleeve and the presence of synovial fluid.

Q: Which of the following is true about anterior shoulder dislocation?

It is the most common type of shoulder dislocation.. **Explanation:** **1. Why Option A is Correct:** Anterior shoulder dislocation is the most common type of shoulder dislocation, accounting for approximately **95-97%** of all cases. The shoulder joint is inherently unstable due to the disproportionate size of the large humeral head compared to the shallow glenoid cavity (the "golf ball on a tee" analogy). **2. Why the Other Options are Incorrect:** * **Option B:** While subclavicular is a subtype of anterior dislocation, the **subcoracoid** position is the most common clinical presentation. * **Option C:** The "saluting position" (abduction and external rotation) is characteristic of **posterior** shoulder dislocation. In anterior dislocation, the patient typically holds the arm in slight abduction and external rotation, supported by the other hand, with an inability to touch the opposite shoulder (**Dugas Test positive**). * **Option D:** While nerve injuries occur, the **Axillary nerve** (circumflex nerve) is the most commonly injured nerve in anterior dislocations, leading to "regimental badge" anesthesia. Brachial plexus injuries are rare and usually associated with high-energy trauma or inferior dislocations (Luxatio Erecta). **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism of Injury:** Forced abduction, extension, and external rotation. * **Classic Signs:** Flattening of the deltoid contour (Square shoulder), prominent acromion, and fullness in the subcoracoid region. * **Associated Lesions:** * **Bankart’s Lesion:** Avulsion of the anteroinferior glenoid labrum (most common cause of recurrence). * **Hill-Sachs Lesion:** Compression fracture of the posterolateral humeral head. * **Management:** Immediate closed reduction (e.g., Kocher’s, Hippocratic, or Stimson’s technique) followed by immobilization in internal rotation.

Question 1

In an open injury during toileting and debridement, what indicates muscle viability?

Accepted Answer

Muscle contractility

Answer

Colour of the muscle

Answer

Punctate bleeding spots on the cut edge

Answer

Muscle function

Question 2

Which of the following is NOT a component of the management of fat embolism syndrome?

Accepted Answer

Streptokinase therapy

Answer

Oxygen therapy

Answer

Heparin administration

Answer

Corticosteroid use

Question 3

A 30-year-old male presented to the ER with an abnormal position of the right upper limb. The range of motion was reduced at the right shoulder, and the patient was in severe pain. On examination, the arm was in an abducted and externally rotated position. Neurovascular examination was normal. Which of the following X-rays most likely corresponds with the above condition?

Accepted Answer

X-ray showing shoulder dislocation with the humeral head anteriorly displaced and externally rotated.

Answer

X-ray showing shoulder dislocation with the humeral head posteriorly displaced and internally rotated.

Answer

X-ray showing a typical shoulder fracture.

Answer

All of the above

Question 4

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

Accepted Answer

Tube cast

Answer

Nailing

Answer

Tension band wiring

Answer

Observation

Question 5

Complications of Colles' fracture include all EXCEPT:

Accepted Answer

Gunstock deformity

Answer

Malunion

Answer

Carpal tunnel syndrome

Answer

Shoulder-hand syndrome

Question 6

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 7

What is the most commonly dislocated joint in the body?

Accepted Answer

Shoulder

Answer

Hip

Answer

Elbow

Answer

Knee

Question 8

A 45-year-old male sustains a femur shaft fracture and is stabilized according to ATLS protocols. After 4 hours, he develops breathlessness with a PaO2 of 56 mmHg and is shifted to the ICU. What is the most likely complication?

Accepted Answer

ARDS

Answer

Cardiac arrest

Answer

Acute bronchial asthma

Answer

Fat embolism syndrome

Question 9

Non-union occurs in the following fractures EXCEPT?

Accepted Answer

Trochanteric

Answer

Neck of femur

Answer

Scaphoid

Answer

Talus

Question 10

Which of the following is true about anterior shoulder dislocation?

Accepted Answer

It is the most common type of shoulder dislocation.

Answer

It is most commonly subclavicular.

Answer

The patient keeps their arm in a saluting position.

Answer

Injury to the brachial plexus may occur.

Trauma — MCQs

Trauma — MCQs

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