Trauma — MCQs

A 44-year-old woman suffers a right tibial plateau fracture after a motor vehicle accident. She is neurovascularly intact with soft compartments and has no other significant injuries apart from a minor concussion and several broken ribs. Which of the following, if present, is an indication for operative fixation?

Q256Medium

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

Q257Medium

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

Q258Medium

A patient with nephrotic syndrome on long-term steroid therapy for 6 years presents with a limp gait and limitation of hip abduction and internal rotation. What is the most probable diagnosis?

Q259Medium

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?

Q260Easy

What does the return of the bulbocavernous reflex indicate in the context of spinal shock?

Trauma Indian Medical PG Practice Questions and MCQs

Question 251: Recurrent dislocations are common in which joint?

A. Shoulder (Correct Answer)
B. Patella
C. Hip joint
D. Elbow joint

Explanation: **Explanation:** The **Shoulder (Glenohumeral) joint** is the most common joint in the body to undergo recurrent dislocation. This is primarily due to its unique anatomy: it is a "ball-and-socket" joint characterized by a large humeral head articulating with a small, shallow glenoid cavity (often compared to a golf ball on a tee). While this allows for an extraordinary range of motion, it inherently sacrifices stability. Recurrence is frequently driven by the failure of soft tissue stabilizers to heal, specifically the **Bankart lesion** (avulsion of the anterior-inferior labrum) and the **Hill-Sachs lesion** (compression fracture of the posterolateral humeral head). Age is the most significant predictor of recurrence; the younger the patient at the time of the first dislocation, the higher the risk of recurrence. **Analysis of Incorrect Options:** * **Patella:** While patellar dislocations can be recurrent (often due to trochlear dysplasia or ligamentous laxity), they are statistically less common than shoulder recurrences in the general population. * **Hip Joint:** The hip is a highly stable, deep socket joint with strong ligamentous support. Dislocation usually requires high-energy trauma (e.g., dashboard injuries), and recurrence is rare unless there is significant bony destruction. * **Elbow Joint:** The elbow is the second most common joint to dislocate in adults, but it possesses high bony stability. Once reduced, it rarely becomes recurrent unless there is an associated fracture (e.g., "Terrible Triad"). **High-Yield Clinical Pearls for NEET-PG:** * **Most common direction:** Anterior (95%), specifically the subcoracoid type. * **Nerve at risk:** Axillary nerve (tested by sensation over the "regimental badge" area). * **Key Radiographic View:** Axillary view or Stryker notch view (for Hill-Sachs). * **Gold Standard Surgery:** Arthroscopic Bankart repair.

Question 252: Following a fracture of the humerus, which of the following is responsible for producing the majority of the new bone that will reunite the two fragments?

A. Cancellous bone
B. Cartilage
C. Compact bone
D. Periosteum (Correct Answer)

Explanation: **Explanation:** The healing of a fracture occurs through a complex physiological process involving the formation of a callus. The **Periosteum** (Option D) is the primary contributor to this process. It consists of two layers: an outer fibrous layer and an inner **osteogenic (cambium) layer**. Following a fracture, the osteoprogenitor cells in the cambium layer are activated, proliferating and differentiating into osteoblasts. These cells produce the "external callus," which bridges the fracture gap and provides the majority of the new bone required for clinical union. **Analysis of Incorrect Options:** * **Cancellous bone (A):** While cancellous bone has a high surface area and osteogenic potential, its contribution is primarily to the "internal callus." It is less significant than the periosteum in the initial bridging of a long bone fracture like the humerus. * **Cartilage (B):** Cartilage is a temporary intermediate tissue formed during endochondral ossification (soft callus stage). It acts as a template but does not "produce" the bone; it is eventually replaced by bone. * **Compact bone (C):** Cortical or compact bone is dense and has a limited blood supply. It contributes the least to rapid callus formation and heals very slowly through direct Haversian remodeling. **NEET-PG High-Yield Pearls:** * **Primary Bone Healing:** Occurs via "contact healing" or "gap healing" only when there is absolute stability (e.g., internal fixation with plates). No callus is formed. * **Secondary Bone Healing:** The most common type (e.g., in casts or intramedullary nails). It involves five stages: Hematoma → Inflammation → Soft Callus → Hard Callus → Remodeling. * **Cambium Layer:** This is the most important layer of the periosteum for fracture healing and is more active in children, explaining their faster healing rates.

Question 253: A compound fracture is initially treated by antibiotics and wound toilet. What is the next appropriate step in management?

A. Skin cover
B. External splintage (Correct Answer)
C. Prosthesis
D. Internal fixation

Explanation: **Explanation:** The management of a compound (open) fracture follows a strict surgical sequence to prevent infection and promote healing. The primary goal in the emergency setting is to convert a contaminated wound into a clean one and provide stable bone alignment. **1. Why External Splintage is Correct:** After initial debridement (wound toilet) and antibiotic administration, the immediate priority is **fracture stabilization**. In the context of an open fracture, **External Splintage** (such as a back slab, Thomas splint, or an External Fixator) is the preferred next step. Stabilization reduces further soft tissue trauma, decreases the risk of fat embolism, and facilitates wound healing by preventing movement at the fracture site. In Gustilo-Anderson Grade II and III injuries, an external fixator is often the definitive "splint" of choice. **2. Why Other Options are Incorrect:** * **Skin Cover (A):** While essential for wound closure, skin grafting or flap coverage is performed only *after* the wound is clean and the bone is stabilized. It is not the immediate next step after debridement. * **Prosthesis (C):** This is used for joint replacement (e.g., femoral neck fractures in the elderly) and is not a standard treatment for acute compound fractures. * **Internal Fixation (D):** Placing hardware (plates/nails) in a potentially contaminated wound increases the risk of chronic osteomyelitis. While "primary internal fixation" is sometimes done for Grade I injuries, external splintage remains the safer, more conventional next step in general management protocols. **Clinical Pearls for NEET-PG:** * **Golden Period:** Wound toilet should ideally be performed within 6–8 hours of injury. * **Gustilo-Anderson Classification:** The most widely used system to grade open fractures based on wound size and soft tissue damage. * **Rule of Thumb:** "Life before limb, limb before bone." Always stabilize the patient (ABCDE) before definitive orthopedic management.

Question 254: In a condylar fracture, the anatomy of the joint is disturbed but the function remains normal. What is this type of joint known as?

A. Dysarthrosis
B. Metarthrosis (Correct Answer)
C. Pseudoarthrosis
D. None

Explanation: ### Explanation **1. Why Metarthrosis is Correct:** The term **Metarthrosis** refers to a clinical condition where the anatomical integrity of a joint is disrupted (usually due to a fracture, such as a condylar fracture), yet the joint continues to function surprisingly well. In these cases, despite the malalignment or intra-articular damage seen on imaging, the patient retains a functional range of motion and stability. This "paradoxical" preservation of function in a structurally damaged joint is the hallmark of metarthrosis. **2. Analysis of Incorrect Options:** * **Dysarthrosis (Option A):** This is a general term for any joint deformity or impairment. It refers to a joint that is malfunctioning or painful due to disease or injury, which contradicts the "normal function" described in the question. * **Pseudoarthrosis (Option C):** Also known as a "false joint," this occurs when a fracture fails to unite (non-union). The body forms a fibrous or synovial-lined space between the bone ends, allowing abnormal movement at a site where there should be solid bone. Unlike metarthrosis, pseudoarthrosis is a pathological failure of healing and usually results in instability or pain. * **None (Option D):** Incorrect, as Metarthrosis specifically defines the scenario provided. **3. Clinical Pearls for NEET-PG:** * **Condylar Fractures:** Often managed conservatively if the occlusion is stable, precisely because the joint can achieve "metarthrosis"—functional adaptation despite anatomical change. * **Anatomical vs. Functional Reduction:** While most intra-articular fractures require perfect anatomical reduction to prevent secondary osteoarthritis, certain joints (like the temporomandibular joint or specific humeral condyle fractures in children) are noted for their functional adaptability. * **Key Distinction:** Remember, **Pseudoarthrosis = Non-union** (pathological), while **Metarthrosis = Functional adaptation** (compensatory).

Question 255: A 44-year-old woman suffers a right tibial plateau fracture after a motor vehicle accident. She is neurovascularly intact with soft compartments and has no other significant injuries apart from a minor concussion and several broken ribs. Which of the following, if present, is an indication for operative fixation?

A. Articular step-off of 5 mm (Correct Answer)
B. ACL tear on follow-up MRI
C. Condylar widening less than 3 mm
D. Lateral meniscal tear on follow-up MRI

Explanation: ### **Explanation** Tibial plateau fractures are intra-articular injuries where the primary goal of management is to restore joint stability, alignment, and articular congruity to prevent secondary osteoarthritis. **1. Why Option A is Correct:** The management of tibial plateau fractures depends on the degree of displacement and instability. **Articular step-off > 3 mm** is a classic absolute indication for operative fixation (Open Reduction and Internal Fixation - ORIF). A 5 mm step-off significantly alters joint loading, leading to rapid cartilage degeneration and post-traumatic arthritis. Other surgical indications include condylar widening > 5 mm, axial malalignment (varus/valgus) > 5°, and any fracture associated with compartment syndrome or vascular injury. **2. Why the Other Options are Incorrect:** * **Option B & D:** Associated soft tissue injuries like ACL or meniscal tears are common in tibial plateau fractures (especially Schatzker II and IV). However, they are generally addressed **after** or during the stabilization of the bony architecture. An isolated ligamentous or meniscal tear is not the primary indication for ORIF of the plateau itself if the bony displacement is minimal. * **Option C:** Condylar widening is an indication for surgery only if it exceeds **5 mm**. Widening less than 3 mm is typically managed conservatively with non-weight-bearing protocols, provided there is no significant step-off or instability. ### **Clinical Pearls for NEET-PG** * **Schatzker Classification:** The most widely used system. Type II (Split-depression of lateral plateau) is the most common. * **Most Common Nerve Injury:** Common Peroneal Nerve (especially in lateral plateau/proximal fibula fractures). * **Imaging Gold Standard:** CT scan with 3D reconstruction is essential for preoperative planning to assess the degree of depression. * **Complication:** Post-traumatic arthritis is the most common long-term complication, even with anatomical reduction.

Question 256: In an open injury during toileting and debridement, what indicates muscle viability?

A. Colour of the muscle
B. Muscle contractility (Correct Answer)
C. Punctate bleeding spots on the cut edge
D. Muscle function

Explanation: 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.

Question 257: Which of the following is NOT a component of the management of fat embolism syndrome?

A. Oxygen therapy
B. Heparin administration
C. Streptokinase therapy (Correct Answer)
D. Corticosteroid use

Explanation: **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.

Question 258: A patient with nephrotic syndrome on long-term steroid therapy for 6 years presents with a limp gait and limitation of hip abduction and internal rotation. What is the most probable diagnosis?

A. Renal osteodystrophy
B. Avascular necrosis of the hip (Correct Answer)
C. Septic arthritis
D. Osteomyelitis of the hip joint

Explanation: ### Explanation **Correct Answer: B. Avascular necrosis (AVN) of the hip** **1. Why it is correct:** The patient has two major risk factors: **Nephrotic syndrome** (associated with hyperlipidemia and hypercoagulability) and **long-term steroid therapy**. Corticosteroids are the most common cause of non-traumatic AVN. They induce fat hypertrophy and micro-emboli in the subchondral bone vessels, leading to ischemia and bone death. Clinically, AVN of the femoral head typically presents with a **limp** and a characteristic pattern of restricted motion: **Internal rotation and abduction** are the first movements to be limited and painful. **2. Why the other options are incorrect:** * **Renal osteodystrophy:** While common in chronic kidney disease, it typically presents with generalized bone pain and features of secondary hyperparathyroidism (like "Rugger-jersey" spine). It does not usually cause isolated, progressive restriction of specific hip movements unless a pathological fracture occurs. * **Septic arthritis:** This is an acute, emergency presentation characterized by high-grade fever, severe pain, and an inability to bear weight. The patient would be systemically ill, unlike the chronic presentation described here. * **Osteomyelitis:** This typically involves the metaphysis of long bones and presents with localized tenderness, swelling, and systemic signs of infection (fever, raised inflammatory markers). **3. NEET-PG High-Yield Pearls:** * **Most common site for AVN:** Femoral head (due to retrograde blood supply via the medial circumflex femoral artery). * **Earliest sign on X-ray:** Sclerosis or the "Crescent sign" (subchondral fracture). * **Investigation of choice:** **MRI** (most sensitive for early/Stage 1 AVN). * **Staging system:** Ficat and Arlet classification is commonly used. * **Management:** Early stages (I & II) are managed with **Core Decompression**; late stages (III & IV) require Total Hip Arthroplasty (THA).

Question 259: 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?

A. X-ray showing shoulder dislocation with the humeral head anteriorly displaced and externally rotated. (Correct Answer)
B. X-ray showing shoulder dislocation with the humeral head posteriorly displaced and internally rotated.
C. X-ray showing a typical shoulder fracture.
D. All of the above

Explanation: ***X-ray showing shoulder dislocation with the humeral head anteriorly displaced and externally rotated.*** - The classic presentation of **arm abduction** and **external rotation** with severe pain indicates **anterior shoulder dislocation**, the most common type (95% of cases). - X-ray would show the **humeral head** displaced **anteriorly and inferiorly** to the **subcoracoid** or **subglenoid** position, consistent with the clinical findings. *X-ray showing shoulder dislocation with the humeral head posteriorly displaced and internally rotated.* - **Posterior dislocation** presents with the arm **adducted** and **internally rotated**, opposite to this patient's presentation. - X-ray would show the classic **"light bulb" sign** due to fixed internal rotation, which doesn't match the external rotation seen here. *X-ray showing a typical shoulder fracture.* - While fractures can cause severe pain and reduced ROM, the specific **abducted and externally rotated** position is pathognomonic for **dislocation**, not fracture. - Fractures typically don't cause the characteristic **fixed positioning** seen in dislocations and would show **bone discontinuity** rather than joint displacement. *All of the above* - Only **anterior dislocation** matches the clinical presentation of abduction and external rotation with severe pain. - The other options represent different pathologies with **distinct clinical presentations** and radiographic findings.

Question 260: What does the return of the bulbocavernous reflex indicate in the context of spinal shock?

A. Sign of recovery from spinal shock (Correct Answer)
B. Pial lesion of the spinal cord
C. Complete transection of the spinal cord
D. Incomplete transection of the spinal cord

Explanation: **Explanation:** **1. Why Option A is correct:** Spinal shock is a state of transient physiological reflex depression below the level of a spinal cord injury. It is characterized by flaccid paralysis, loss of sensations, and **absent reflexes** (including autonomic reflexes). The **Bulbocavernous Reflex (BCR)**—elicited by squeezing the glans penis or tugging on a Foley catheter while feeling for anal sphincter contraction—is typically the first reflex to return as spinal shock resolves. Therefore, the presence of BCR signifies the **end of spinal shock**, allowing for a more accurate assessment of the true extent of the neurological injury. **2. Why other options are incorrect:** * **Option B:** A pial lesion refers to the superficial layer of the spinal cord and is not a clinical term used to describe the resolution of spinal shock. * **Options C & D:** The return of BCR does **not** differentiate between complete or incomplete transection. It merely indicates that the spinal cord distal to the injury is physiologically active again. If BCR returns but there is no motor or sensory function below the level of injury, it is a **Complete** injury. If some function returns along with BCR, it is an **Incomplete** injury. **Clinical Pearls for NEET-PG:** * **Definition of Spinal Shock:** A physiological shutdown, not an anatomical one. * **Sequence of Recovery:** BCR is the first reflex to return (usually within 24–48 hours). * **Prognostic Rule:** You cannot definitively label a spinal cord injury as "Complete" until the spinal shock has resolved (i.e., until the BCR has returned). * **Neurogenic Shock vs. Spinal Shock:** Do not confuse the two. Neurogenic shock is a **hemodynamic** phenomenon (hypotension + bradycardia) due to loss of sympathetic tone, whereas spinal shock is a **neurological** phenomenon (loss of reflexes).

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Open Fractures

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Fractures in Children

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Fracture Complications

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Nonunion and Malunion

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Joint Dislocations

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Trauma — MCQs

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