Trauma Practice Questions

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

It is associated with muscle tendon rupture.. **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.

Q: 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?

Starvation and chest infection. **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.

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

Malunion. ### 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.

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

Lower End Radius (Colles fracture). **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**.

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

Strain of a valgus knee with axial loading. **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.

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

X-ray of both arms with elbows for comparison. **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.

Q: What is myositis ossificans?

Post-traumatic ossification. **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 1

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

Accepted Answer

It is associated with muscle tendon rupture.

Answer

There is inflammation around the ruptured muscle with deposition of hydroxyapatite crystals.

Answer

It is common in supracondylar fracture.

Answer

It involves ossification of a musculo-periosteal haematoma.

Question 2

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?

Accepted Answer

Starvation and chest infection

Answer

Myocarditis

Answer

Hypercalcemia

Answer

Hyperphosphatemia

Question 3

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

Accepted Answer

Malunion

Answer

Avascular necrosis of the femoral head

Answer

Rupture of the Iliopsoas tendon

Answer

Distal gangrene

Question 4

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

Accepted Answer

Lower End Radius (Colles fracture)

Answer

Lower End Ulna

Answer

5th Metacarpal

Answer

Capitate

Question 5

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

Accepted Answer

Strain of a valgus knee with axial loading

Answer

Strain of a valgus knee

Answer

Strain of a varus knee

Answer

Rotational injury

Question 6

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

Accepted Answer

X-ray of both arms with elbows for comparison

Answer

X-ray of the same limb only

Answer

Examination under general anesthesia

Answer

Plaster of Paris cast in fully flexed position

Question 7

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

Accepted Answer

Subcapital, transcervical, and basal fractures

Answer

Intertrochanteric and basal fractures

Answer

Intertrochanteric and transcervical fractures

Answer

Subcapital and basal fractures

Question 8

What is myositis ossificans?

Accepted Answer

Post-traumatic ossification

Answer

Worm calcification

Answer

Callus formation

Answer

Regeneration

Question 9

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

Accepted Answer

Intertrochanteric fracture

Answer

Fracture of the neck of the femur

Answer

Clavicle fracture

Answer

Colles fracture

Question 10

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?

Accepted Answer

Injury to the posterior interosseous nerve

Answer

Iatrogenic injury to the common extensor origin

Answer

Injury to the anterior interosseous nerve

Answer

High radial nerve palsy

Trauma — MCQs

Trauma — MCQs

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