Trauma Practice Questions

Q: What is a Colles fracture?

Common in elderly women. **Explanation:** A **Colles fracture** is a classic extra-articular fracture of the distal radius occurring approximately 2.5 cm proximal to the wrist joint, characterized by **dorsal displacement** and angulation (the "Dinner Fork" deformity). **Why Option C is Correct:** This fracture is most frequently seen in **elderly women** (post-menopausal). The underlying medical concept is **osteoporosis**, which weakens the metaphyseal bone of the distal radius. The typical mechanism of injury is a **fall on an outstretched hand (FOOSH)** with the wrist in dorsiflexion. In younger patients, the same mechanism usually results in a scaphoid fracture or requires high-energy trauma. **Why Other Options are Incorrect:** * **Option A:** In adolescents, the distal radial epiphysis is more likely to slide (Slipped Capital Radial Epiphysis) or result in a "Greenstick" fracture rather than a classic Colles. * **Option B:** Fractures about the ankle joint include Pott’s fracture or Cotton’s fracture, not Colles. * **Option C:** A fracture of the head of the radius is a separate clinical entity, often associated with Essex-Lopresti injury, but it is not a Colles fracture. **High-Yield Clinical Pearls for NEET-PG:** * **Deformities:** Remember the mnemonic **"P-DOG"** for Colles: **P**roximal to joint, **D**orsal displacement, **O**utstretched hand, **G**arden spade deformity (Wait—Dinner Fork is Colles; Garden Spade is Smith’s). * **Smith’s Fracture:** Often called a "Reverse Colles," involving **volar** (palmar) displacement. * **Complications:** The most common late complication is **malunion** (leading to Dinner Fork deformity). The most common tendon involved is a rupture of the **Extensor Pollicis Longus (EPL)**. Sudeck’s osteodystrophy (CRPS) is also a known complication.

Q: Early recovery of Sudeck's atrophy can be best managed by which of the following interventions?

Intraarterial injection of novacaine.. **Explanation:** **Sudeck’s Atrophy**, also known as Complex Regional Pain Syndrome (CRPS) Type 1, is a condition characterized by post-traumatic pain, swelling, and vasomotor instability, typically occurring after fractures (e.g., Colles' fracture). The underlying pathophysiology involves an **overactive sympathetic nervous system** leading to persistent vasospasm and localized ischemia. **Why Option B is Correct:** The management of early-stage Sudeck’s atrophy focuses on breaking the "pain-vasospasm-pain" cycle. **Intra-arterial injection of Novocaine (Procaine)** acts as a powerful vasodilator and local anesthetic. By injecting it into the main artery of the affected limb (e.g., brachial artery), it provides immediate sympathetic blockade, improves peripheral blood flow, and reduces the intense burning pain, facilitating early mobilization. **Why Other Options are Incorrect:** * **Option A:** Articaine is a local anesthetic primarily used in dentistry. While it has a rapid onset, it is not the traditional or clinically documented agent of choice for intra-arterial sympathetic blockade in CRPS management compared to Novocaine. * **Option C & D:** Since Novocaine is the specific established treatment for this intervention in classical orthopedic teaching, these options are incorrect. **Clinical Pearls for NEET-PG:** * **Radiological Hallmark:** "Spotty" or patchy osteoporosis (sudden demineralization) seen on X-ray. * **Clinical Features:** The "4 Ds" – Discoloration, Dependency edema, Degenerative changes (stiffness), and Desensitization (hyperalgesia). * **Gold Standard Diagnosis:** Triple-phase bone scan (shows increased uptake). * **Other Treatments:** Physiotherapy (most important), Vitamin C (prophylaxis), and Guanethidine blocks.

Q: What is the treatment modality for the following fracture?

Tension band wiring. ***Tension band wiring*** - **Tension band wiring** is the gold standard for transverse **patella fractures** and **olecranon fractures**, utilizing the biomechanical principle of converting **tension forces** into **compression forces** across the fracture site. - The **AO technique** involves placement of **2 parallel K-wires** with a **figure-of-8 wire** configuration, providing excellent stability while allowing early mobilization and preserving the **extensor mechanism**. *External fixation* - External fixation is typically reserved for **open fractures** with significant **soft tissue damage** or **infected fractures**, not for simple transverse patella fractures. - This method provides **inadequate compression** across the fracture site and may lead to **pin tract infections** and **joint stiffness**. *Plating* - **Plating** requires extensive **soft tissue dissection** and may compromise the **blood supply** to the patella, increasing risk of **avascular necrosis**. - The **biomechanical advantage** of tension band wiring is lost with plating, as it doesn't convert tension forces to compression effectively for this fracture pattern. *ORIF* - **ORIF** is a general term for open reduction and internal fixation, but doesn't specify the **optimal fixation method** for transverse patella fractures. - While ORIF can include various techniques, **tension band wiring** remains the specific preferred method due to its superior biomechanical properties for this fracture type.

Q: What is the X-ray diagnosis?

Supracondylar humerus fracture. ***Supracondylar humerus fracture*** - The **anterior humeral line** does not pass through the middle third of the **capitellum**, a key radiographic sign for supracondylar fractures. - This is the **most common pediatric elbow fracture**, typically occurring after a fall on an outstretched hand with hyperextension injury. *Olecranon fracture* - Would show a clear **fracture line** through the **olecranon process** of the ulna, which is not present here. - Typically causes inability to actively extend the elbow due to **triceps muscle disruption**. *Humerus shaft fracture* - The fracture line would be located in the **mid-shaft** of the humerus, not near the elbow joint. - Associated with **radial nerve palsy** causing wrist drop and loss of thumb extension. *Elbow dislocation* - Shows **displacement** of the radius and ulna relative to the humerus with loss of normal joint alignment. - The **radiocapitellar line** would not pass through the center of the capitellum in true dislocations.

Q: A Tillaux fracture involves which part of the bone?

Lower end tibia. **Explanation:** A **Tillaux fracture** is a specific type of avulsion fracture involving the **anterolateral tubercle of the distal (lower end) tibia**. **1. Why Option A is correct:** The fracture occurs due to an external rotation force of the foot, which puts extreme tension on the **Anterior Inferior Tibiofibular Ligament (AITFL)**. Instead of the ligament tearing, it pulls off a bony fragment from its insertion site on the lateral aspect of the distal tibia. In pediatric populations, this is known as a **Juvenile Tillaux fracture** (a Salter-Harris Type III injury), occurring because the medial part of the distal tibial growth plate closes before the lateral part, leaving the lateral side vulnerable to avulsion. **2. Why the other options are incorrect:** * **Upper end tibia (B):** Fractures here are typically Tibial Plateau fractures or Segond fractures (avulsion of the lateral capsule). * **Lower end femur (C):** Common injuries include Supracondylar or Intercondylar fractures, often due to high-energy trauma. * **Upper end femur (D):** This involves Neck of Femur or Intertrochanteric fractures, common in geriatric falls or high-impact trauma. **Clinical Pearls for NEET-PG:** * **Mechanism:** Forced external rotation of the ankle. * **Radiology:** Best seen on an AP view of the ankle; however, **CT scans** are the gold standard to assess the degree of displacement and articular involvement. * **Management:** Displaced fractures (>2mm) require Open Reduction and Internal Fixation (ORIF) to prevent secondary osteoarthritis. * **Differentiate:** Do not confuse this with a **Wagstaffe-Le Fort fracture**, which is an avulsion of the AITFL from the **fibula** rather than the tibia.

Q: What is a crescent fracture?

Fracture of the iliac crest. **Explanation:** A **Crescent fracture** is a specific type of unstable pelvic ring injury. It is a fracture-dislocation of the sacroiliac (SI) joint where a vertical fracture line runs through the posterior portion of the **iliac crest** (the posterior superior iliac spine), leaving a "crescent-shaped" fragment attached to the sacrum via the posterior SI ligaments. **Analysis of Options:** * **A. Fracture of the iliac crest (Correct):** This is the defining feature of the crescent fracture. It typically occurs due to a Lateral Compression (LC) injury (Young-Burgess Type II). The force causes the iliac bone to fracture posteriorly while the anterior SI ligaments are disrupted. * **B. Fracture of the coccyx:** These are usually isolated injuries resulting from a direct fall on the buttocks and are not associated with the "crescent" eponym. * **C. Fracture of the calcaneum:** Common eponyms for calcaneal fractures include "Lover’s fracture" or "Don Juan fracture." * **D. Fracture of the Atlas:** A fracture of the C1 vertebra is known as a **Jefferson fracture**. **High-Yield Clinical Pearls for NEET-PG:** * **Classification:** Crescent fractures are categorized under the **Young-Burgess classification** as **Lateral Compression Type II (LC-II)**. * **Stability:** These are considered rotationally unstable but vertically stable injuries. * **Management:** Surgical stabilization (ORIF) is often required to restore the pelvic ring integrity and prevent long-term gait abnormalities or chronic pain. * **Radiology:** On an AP view of the pelvis, look for a vertical fracture line through the ilium that spares the sacroiliac joint surface itself.

Question 1

What is a Colles fracture?

Accepted Answer

Common in elderly women

Answer

Common in adolescence

Answer

A fracture about the ankle joint

Answer

A fracture of the head of the radius

Question 2

What is the initial management for an open fracture?

Accepted Answer

Debridement

Answer

Tourniquet

Answer

Internal fixation

Answer

External fixation

Question 3

All of the following factors evaluate the chances of amputation in a limb, except?

Accepted Answer

Presence of infection

Answer

Age

Answer

Blood Pressure

Answer

Velocity of trauma

Question 4

Early recovery of Sudeck's atrophy can be best managed by which of the following interventions?

Accepted Answer

Intraarterial injection of novacaine.

Answer

Intraarterial injection of articaine.

Answer

Both intraarterial injection of articaine and novacaine.

Answer

Neither intraarterial injection of articaine nor novacaine.

Question 5

Arrange the following nerves according to the incidence of their involvement in a supracondylar fracture of the humerus:

Accepted Answer

Anterior interosseous nerve, Median nerve, Radial nerve, Ulnar nerve

Answer

Anterior interosseous nerve, Median nerve, Ulnar nerve, Radial nerve

Answer

Median nerve, Anterior interosseous nerve, Radial nerve, Ulnar nerve

Answer

Ulnar nerve, Median nerve, Radial nerve, Anterior interosseous nerve

Question 6

What is the treatment modality for the following fracture?

Accepted Answer

Tension band wiring

Answer

External fixation

Answer

Plating

Answer

ORIF

Question 7

What is the X-ray diagnosis?

Accepted Answer

Supracondylar humerus fracture

Answer

Olecranon fracture

Answer

Humerus shaft fracture

Answer

Elbow dislocation

Question 8

A 25-year-old man presents with a blue right arm with absent radial pulse and painful passive finger extension following a supracondylar fracture of the humerus. What condition is he most likely suffering from?

Accepted Answer

Compartment syndrome

Answer

Sudeck's atrophy

Answer

Median nerve injury

Answer

Myositis ossificans

Question 9

A Tillaux fracture involves which part of the bone?

Accepted Answer

Lower end tibia

Answer

Upper end tibia

Answer

Lower end femur

Answer

Upper end femur

Question 10

What is a crescent fracture?

Accepted Answer

Fracture of the iliac crest

Answer

Fracture of the coccyx

Answer

Fracture of the calcaneum

Answer

Fracture of the Atlas

Trauma — MCQs

Trauma — MCQs

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