Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 751: Which of the following statements is not true about Myositis ossificans?

A. It is associated with muscle tendon rupture. (Correct Answer)
B. There is inflammation around the ruptured muscle with deposition of hydroxyapatite crystals.
C. It is common in supracondylar fracture.
D. It involves ossification of a musculo-periosteal haematoma.

Explanation: **Explanation:** **Myositis Ossificans (MO)** is a condition characterized by heterotopic ossification (bone formation) within soft tissues, most commonly muscles. **Why Option A is the Correct Answer (The "Not True" Statement):** Myositis ossificans is typically associated with **muscle contusions** or **blunt trauma** that leads to an intramuscular hematoma, rather than a complete muscle tendon rupture. While trauma is the trigger, the pathology involves the ossification of the hematoma within the muscle belly itself, not the tendon. **Analysis of Other Options:** * **Option B:** The pathophysiology involves an inflammatory response following trauma. Primitive mesenchymal cells in the connective tissue differentiate into osteoblasts, leading to the deposition of **hydroxyapatite crystals** (the inorganic component of bone) within the soft tissue. * **Option C:** It is a well-known complication of **Supracondylar fractures of the humerus**, especially if there is repeated forceful manipulation or passive stretching of the elbow joint post-injury. The Brachialis muscle is most frequently involved. * **Option D:** The process begins with a **musculo-periosteal haematoma**. If this hematoma is not absorbed, it undergoes organization and subsequent ossification, transforming into a mass of lamellar bone. **NEET-PG High-Yield Pearls:** * **Most common site:** Brachialis (Elbow) and Quadriceps (Thigh). * **Radiological Sign:** **"Zonal Phenomenon"** – Mature lamellar bone is found at the periphery, while the center remains immature (unlike osteosarcoma, which is more dense centrally). * **Management:** Rest and immobilization in the acute phase. **Passive stretching is strictly contraindicated** as it worsens the condition. * **Surgery:** Excision is only considered after the bone has "matured" (usually 6–12 months), indicated by a cold bone scan and well-defined margins on X-ray.

Question 752: A 20-year-old man was diagnosed with myositis ossificans progressiva. He died five years later. What was the most probable cause of his death?

A. Starvation and chest infection (Correct Answer)
B. Myocarditis
C. Hypercalcemia
D. Hyperphosphatemia

Explanation: **Explanation:** **Myositis Ossificans Progressiva (MOP)**, also known as **Fibrodysplasia Ossificans Progressiva (FOP)**, is a rare genetic connective tissue disorder characterized by the progressive replacement of muscles, tendons, and ligaments by mature bone (heterotopic ossification). **Why Option A is correct:** The cause of death in MOP is typically related to the anatomical sites of ossification: 1. **Starvation:** Ossification of the **masseter and temporomandibular joints** leads to "jaw locking" (ankylosis). This makes mastication impossible, leading to severe malnutrition and starvation. 2. **Chest Infection:** Ossification of the **intercostal muscles and paraspinal ligaments** creates a "stone man" effect, severely restricting chest wall expansion. This results in **Thoracic Insufficiency Syndrome**, leading to restrictive lung disease, poor cough reflex, and recurrent, ultimately fatal, bronchopneumonia. **Why the other options are incorrect:** * **B. Myocarditis:** MOP specifically spares smooth muscles and cardiac muscle. The heart is not involved in the ossification process. * **C & D. Hypercalcemia/Hyperphosphatemia:** While MOP involves abnormal bone formation, it is a disorder of tissue induction (ACVR1 gene mutation), not a primary metabolic bone disease. Serum calcium and phosphate levels are typically **normal**. **Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Dominant (Mutation in **ACVR1/ALK2 gene**). * **Pathognomonic Sign:** Congenital **short/deviated great toe** (hallux valgus) or thumb. * **Progression:** Follows a cranio-caudal and dorso-ventral pattern (starts at the neck/shoulders and moves down). * **Management Caution:** Avoid biopsies or intramuscular injections, as trauma triggers "flare-ups" and rapid new bone formation.

Question 753: What is the most common complication following an intertrochanteric fracture of the femur?

A. Avascular necrosis of the femoral head
B. Malunion (Correct Answer)
C. Rupture of the Iliopsoas tendon
D. Distal gangrene

Explanation: ### Explanation **Correct Answer: B. Malunion** Intertrochanteric (IT) fractures occur in the extracapsular region of the proximal femur, which is characterized by a rich blood supply and a large surface area of cancellous bone. Because of this robust vascularity, these fractures almost always heal (low rate of non-union). However, the region is subject to significant biomechanical stresses and powerful muscle pulls (iliopsoas, abductors, and gluteals). This often leads to a **coxa vara** deformity (decreased neck-shaft angle), resulting in **malunion**. This is the most frequent complication, especially in unstable fracture patterns or when internal fixation fails to maintain anatomical alignment. **Why other options are incorrect:** * **A. Avascular Necrosis (AVN):** This is a classic complication of **intracapsular** neck of femur fractures, where the retrograde blood supply (medial circumflex femoral artery) is disrupted. Since IT fractures are extracapsular, the blood supply to the head remains intact. * **C. Rupture of the Iliopsoas tendon:** While the iliopsoas attaches to the lesser trochanter (which is often avulsed in IT fractures), a complete tendon rupture is rare. The clinical focus is on the bony avulsion rather than tendon integrity. * **D. Distal gangrene:** This would imply major arterial injury (e.g., femoral artery). While vascular injury can occur in high-energy femoral shaft trauma, it is extremely rare in isolated IT fractures. **NEET-PG High-Yield Pearls:** * **Neck of Femur (Intracapsular) Fractures:** Most common complication is **Non-union**, followed by **AVN**. * **Intertrochanteric (Extracapsular) Fractures:** Most common complication is **Malunion (Coxa Vara)**. * **Treatment of Choice:** For stable IT fractures, the **Dynamic Hip Screw (DHS)** is preferred; for unstable/reverse oblique patterns, the **Proximal Femoral Nail (PFN)** is the gold standard.

Question 754: Which bone is most commonly fractured in a fall on an outstretched hand?

A. Lower End Ulna
B. Lower End Radius (Colles fracture) (Correct Answer)
C. 5th Metacarpal
D. Capitate

Explanation: **Explanation:** The **Lower End of the Radius** is the most common site of fracture following a **Fall On an Outstretched Hand (FOOSH)**. When a person falls forward, the natural reflex is to extend the hand to break the fall. This results in the body's weight being transmitted through the carpal bones (specifically the scaphoid and lunate) directly into the distal articular surface of the radius. In adults, especially post-menopausal women with decreased bone density, this force typically results in a **Colles' fracture**—a transverse fracture of the distal radius with dorsal displacement and angulation (the "Dinner Fork" deformity). **Analysis of Incorrect Options:** * **Lower End Ulna:** While the ulnar styloid is often fractured concurrently with the radius, the radius bears approximately 80% of the axial load at the wrist, making it the primary site of injury. * **5th Metacarpal:** A fracture of the 5th metacarpal neck is known as a **Boxer’s fracture**, typically caused by a direct blow with a clenched fist against a hard object, not a FOOSH. * **Capitate:** Although it is the largest carpal bone, it is centrally located and well-protected. The most commonly fractured carpal bone in a FOOSH is the **Scaphoid**, not the capitate. **High-Yield Clinical Pearls for NEET-PG:** * **Colles' Fracture:** Distal fragment is displaced **Dorsally** (Dinner fork deformity). * **Smith’s Fracture:** Also known as a "Reverse Colles," caused by a fall on a **flexed** wrist; the distal fragment is displaced **Ventrally** (Garden spade deformity). * **Barton’s Fracture:** An intra-articular fracture-dislocation of the distal radius. * **Most common complication of Colles' fracture:** Stiffness of the fingers and wrist; the most common nerve involved is the **Median Nerve**.

Question 755: What is the mechanism of injury in a lateral condylar fracture of the proximal tibia?

A. Strain of a valgus knee
B. Strain of a varus knee
C. Strain of a valgus knee with axial loading (Correct Answer)
D. Rotational injury

Explanation: **Explanation:** The proximal tibia (tibial plateau) is a critical weight-bearing surface. Fractures here, specifically of the **lateral condyle**, are most commonly caused by a combination of **valgus stress (abduction) and axial loading**. 1. **Mechanism of Correct Answer:** When a valgus force is applied to the knee (often from a lateral blow, such as a "bumper injury" in a pedestrian), the lateral femoral condyle is driven into the lateral tibial plateau. Because the lateral plateau is convex and relatively weaker than the medial side, the axial load causes the femoral condyle to act like a "wedge," resulting in a split, depression, or a combination of both (Schatzker Types I-III). 2. **Analysis of Incorrect Options:** * **Strain of a valgus knee (A):** While valgus stress is necessary, simple strain without **axial loading** usually results in a Medial Collateral Ligament (MCL) tear rather than a bony fracture. * **Strain of a varus knee (B):** Varus stress (adduction) targets the **medial condyle**. Medial plateau fractures are less common and usually signify higher energy trauma. * **Rotational injury (D):** Rotational forces are typically associated with ligamentous injuries (like ACL tears) or meniscal injuries, rather than isolated tibial plateau fractures. **High-Yield Clinical Pearls for NEET-PG:** * **Schatzker Classification:** The most widely used system. Type II (Split-depression) is the most common. * **Associated Injuries:** Lateral plateau fractures are frequently associated with **MCL injuries** and **lateral meniscal tears**. * **Nerve Involvement:** High-energy fractures or those involving the proximal fibula may damage the **Common Peroneal Nerve**, leading to foot drop. * **Compartment Syndrome:** Always monitor for this surgical emergency in high-energy tibial plateau fractures.

Question 756: What imaging is required for a suspected medial epicondylar fracture of the humerus in a 4-year-old child?

A. X-ray of both arms with elbows for comparison (Correct Answer)
B. X-ray of the same limb only
C. Examination under general anesthesia
D. Plaster of Paris cast in fully flexed position

Explanation: **Explanation:** The correct answer is **A. X-ray of both arms with elbows for comparison.** In pediatric orthopaedics, the elbow is one of the most challenging areas to interpret due to the sequential appearance of six different ossification centers. At age 4, several centers (like the medial epicondyle, which typically appears at age 5) may be in the process of appearing or may be cartilaginous and invisible on X-ray. Comparison views of the contralateral, uninjured elbow are the **gold standard** for identifying subtle fractures, displacements, or abnormal ossification patterns in children. **Analysis of Incorrect Options:** * **B. X-ray of the same limb only:** This is often insufficient in children because normal growth plates can be easily mistaken for fracture lines (and vice versa) without a baseline for comparison. * **C. Examination under anesthesia (EUA):** While EUA is useful for assessing joint stability or performing a closed reduction, it is not the primary *imaging* modality required for initial diagnosis. * **D. Plaster of Paris cast:** This is a treatment modality, not a diagnostic imaging step. Furthermore, immobilizing a suspected fracture in full flexion without confirming the diagnosis can lead to compartment syndrome or neurovascular compromise. **High-Yield Clinical Pearls for NEET-PG:** * **CRITOE Mnemonic:** Remember the order of ossification centers: **C**apitellum (1y), **R**adial head (3y), **I**nternal/Medial epicondyle (5y), **T**rochlea (7y), **O**lecranon (9y), **E**xternal/Lateral epicondyle (11y). * **The "Trap":** The medial epicondyle is the most common "missed" fracture because it can be displaced into the joint space and mistaken for the trochlea. * **Clinical Sign:** Medial epicondyle fractures are often associated with elbow dislocations and ulnar nerve injuries.

Question 757: Avascular necrosis (AVN) is seen in which type of fracture of the femur?

A. Subcapital, transcervical, and basal fractures (Correct Answer)
B. Intertrochanteric and basal fractures
C. Intertrochanteric and transcervical fractures
D. Subcapital and basal fractures

Explanation: ### Explanation **The Core Concept: Intracapsular vs. Extracapsular Fractures** The blood supply to the femoral head is precarious and primarily depends on the **medial circumflex femoral artery** (via retinacular vessels). The hip joint capsule attaches anteriorly to the intertrochanteric line and posteriorly to the femoral neck (medial to the intertrochanteric crest). Fractures occurring **within the capsule (Intracapsular)**—which include **subcapital, transcervical, and basal (basicervical)** fractures—disrupt these retinacular vessels. Because the femoral head has minimal collateral circulation and is bathed in synovial fluid (which lacks pro-coagulants), these fractures carry a high risk of ischemia, leading to **Avascular Necrosis (AVN)** and non-union. **Analysis of Options:** * **Option A (Correct):** All three are intracapsular fractures. Even the basal (basicervical) fracture, located at the junction of the neck and the trochanter, is considered intracapsular and can compromise the blood supply. * **Options B, C, & D (Incorrect):** These include **Intertrochanteric fractures**. Intertrochanteric fractures are **extracapsular**. This region has a robust blood supply from the surrounding cancellous bone and muscle attachments, making AVN extremely rare. These fractures typically heal well but are more prone to malunion (coxa vara) rather than AVN. **NEET-PG High-Yield Pearls:** * **Garden’s Classification:** Used for subcapital fractures; Stages III and IV have the highest risk of AVN. * **Pauwels’ Classification:** Based on the angle of the fracture line; higher angles (Type III) indicate greater shear forces and instability. * **Clinical Sign:** In neck of femur fractures, the limb is **shortened and externally rotated**. * **Management:** In elderly patients with displaced fractures, **Hemiarthroplasty or Total Hip Replacement** is preferred over fixation to avoid the complications of AVN.

Question 758: What is myositis ossificans?

A. Worm calcification
B. Callus formation
C. Regeneration
D. Post-traumatic ossification (Correct Answer)

Explanation: **Explanation:** **Myositis Ossificans (MO)** is a condition characterized by the formation of heterotopic bone (lamellar bone) within soft tissues, most commonly muscles. It is essentially a **post-traumatic ossification** (Option D) resulting from the metaplasia of mesenchymal stem cells in the connective tissue of the muscle following a hematoma. * **Why Option D is correct:** The most common form is *Myositis Ossificans Circumscripta*, which occurs after blunt trauma (e.g., a thigh contusion). The injury triggers an inflammatory cascade where fibroblasts are replaced by osteoblasts, leading to ectopic bone formation within the muscle belly. * **Why Option A is incorrect:** Worm calcification (calcified parasites like *Taenia solium*) represents dystrophic calcification, not the organized bone formation seen in MO. * **Why Option B is incorrect:** Callus formation is a normal physiological stage of bone healing at a fracture site. MO occurs in soft tissue, often without an associated fracture. * **Why Option C is incorrect:** Regeneration refers to the replacement of damaged tissue with the same cell type. MO is a pathological process of metaplasia, not normal muscle regeneration. **NEET-PG High-Yield Pearls:** 1. **Common Sites:** Brachialis (elbow) and Quadriceps (thigh). 2. **Radiological Sign:** The **"Zonal Phenomenon"** is characteristic—the lesion is more mature (calcified) at the periphery and immature (radiolucent) in the center. This distinguishes it from Osteosarcoma (which is more dense centrally). 3. **Clinical Warning:** Passive stretching or forceful massage of a traumatized muscle significantly increases the risk of developing MO. 4. **Management:** Initially rest and NSAIDs (Indomethacin); surgery is only indicated after the bone matures (usually 6–12 months), evidenced by a cold bone scan.

Question 759: Which of the following fractures requires a violent force for its occurrence?

A. Fracture of the neck of the femur
B. Intertrochanteric fracture (Correct Answer)
C. Clavicle fracture
D. Colles fracture

Explanation: **Explanation:** The correct answer is **Intertrochanteric (IT) fracture**. **1. Why Intertrochanteric Fracture is the Correct Answer:** The intertrochanteric region of the femur consists of dense, thick cortical bone and is highly vascular. Because this area is structurally robust, it typically requires a **high-energy, violent force** (such as a motor vehicle accident or a fall from a significant height) to cause a fracture in young, healthy individuals. While these fractures are common in the elderly due to osteoporosis, the question asks which fracture *inherently* necessitates violent force for its occurrence across general demographics. **2. Why the Other Options are Incorrect:** * **Fracture of the Neck of Femur:** This is often an intracapsular fracture that occurs due to **low-energy trauma** (like a simple trip or fall) in elderly patients with osteoporotic bones. * **Clavicle Fracture:** This is one of the most common fractures in the body and frequently occurs due to a simple fall on an outstretched hand or a direct blow of moderate intensity. * **Colles Fracture:** This is a classic "fragility fracture" of the distal radius. It typically occurs due to a **low-energy fall** on an outstretched hand (FOOSH), especially in postmenopausal women. **3. Clinical Pearls for NEET-PG:** * **Blood Loss:** IT fractures are extracapsular and highly vascular; they are associated with significant occult blood loss (up to 1–1.5 liters). * **Clinical Presentation:** The affected limb in an IT fracture shows marked **shortening and maximum external rotation** (nearly 90 degrees), whereas neck of femur fractures show less pronounced external rotation (45 degrees). * **Treatment Gold Standard:** Dynamic Hip Screw (DHS) or Cephalomedullary nails (e.g., PFN). * **Healing:** Unlike neck of femur fractures, IT fractures rarely go into non-union or avascular necrosis (AVN) because of the excellent blood supply in the trochanteric region.

Question 760: A 30-year-old male underwent excision of the right radial head. Postoperatively, the patient developed an inability to extend the fingers and thumb of the right hand. He had no sensory deficit. Which of the following is the most likely cause?

A. Injury to the posterior interosseous nerve (Correct Answer)
B. Iatrogenic injury to the common extensor origin
C. Injury to the anterior interosseous nerve
D. High radial nerve palsy

Explanation: ### Explanation **1. Why Option A is Correct:** The **Posterior Interosseous Nerve (PIN)** is a deep branch of the radial nerve that winds around the neck of the radius within the supinator muscle (through the Arcade of Frohse). During surgeries involving the proximal radius, such as **radial head excision** or internal fixation, the PIN is highly vulnerable to iatrogenic injury due to its close anatomical proximity to the radial neck. * **Clinical Presentation:** The PIN supplies the extensor muscles of the forearm. Injury leads to a loss of extension at the metacarpophalangeal (MCP) joints of the fingers and loss of thumb extension. * **The Key Differentiator:** Because the PIN is a purely motor nerve (after it pierces the supinator), there is **no sensory loss**, which perfectly matches the clinical scenario described. **2. Why the Other Options are Incorrect:** * **Option B (Common Extensor Origin):** Injury here would cause pain or weakness in wrist extension, but it would not typically result in a complete inability to extend the fingers and thumb while leaving sensation intact. * **Option C (Anterior Interosseous Nerve):** The AIN is a branch of the Median nerve. Injury results in the inability to flex the distal phalanges of the thumb and index finger (loss of the "OK" sign), not an extension deficit. * **Option D (High Radial Nerve Palsy):** This occurs proximal to the elbow. While it causes finger extension loss, it also results in **wrist drop** (loss of ECRL/ECRB) and **sensory loss** over the first dorsal web space. In PIN palsy, wrist extension is usually preserved (though deviated radially) because the ECRL is supplied by the radial nerve proper above the elbow. **3. NEET-PG High-Yield Pearls:** * **PIN Palsy:** Finger drop + Thumb drop + **No sensory loss**. * **Radial Nerve Palsy:** Wrist drop + Finger drop + **Sensory loss**. * **Safe Zone:** To avoid PIN injury during the Thompson (posterolateral) approach to the radius, the forearm should be **pronated** to move the nerve further away from the surgical site. * **Arcade of Frohse:** The most common site of PIN entrapment.

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Trauma — MCQs

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