Trauma Practice Questions

Q: Which of the following elbow injuries involves the three-point relationship?

Supracondylar fracture of the humerus. ### Explanation The **three-point relationship** of the elbow refers to the clinical landmarking of the **olecranon process**, the **medial epicondyle**, and the **lateral epicondyle**. In a normal flexed elbow (90°), these three points form an isosceles triangle; in full extension, they lie in a straight horizontal line. #### Why Supracondylar Fracture is Correct In a **Supracondylar fracture of the humerus**, the fracture line is proximal to the epicondyles. Since the anatomy of the distal humerus and its relationship with the proximal ulna remains intact, the **three-point relationship is maintained**. This is the most critical clinical feature used to differentiate it from an elbow dislocation. #### Why Other Options are Incorrect * **Posterior Dislocation of the Elbow:** The olecranon is displaced posteriorly relative to the epicondyles. This **disturbs** the three-point relationship, making it the primary clinical differentiator from a supracondylar fracture. * **Fracture of the Medial/Lateral Epicondyle:** These are intra-articular or peri-articular fractures involving the landmarks themselves. Displacement of either epicondyle will **distort** the equilateral/isosceles triangle symmetry. #### NEET-PG High-Yield Pearls * **The "Rule of Three":** In Supracondylar fractures, the relationship is **Normal**. In Elbow Dislocation, the relationship is **Abnormal**. * **Most Common Complication:** The most common immediate complication of supracondylar fractures is **Neuropraxia** (Median nerve, specifically the Anterior Interosseous Nerve/AIN). * **Late Sequel:** The most characteristic late deformity is **Cubitus Varus** (Gunstock deformity). * **Emergency:** Always check the radial pulse to rule out **Volkmann’s Ischemic Contracture (VIC)** due to brachial artery involvement.

Q: What are the complications of fracture of the radius?

All of the above. Fractures of the radius (including distal radius, shaft, or radial head) are common orthopedic injuries associated with several significant complications. The correct answer is **All of the above** because radial fractures can lead to vascular, soft tissue, and surgical complications. ### **Explanation of Options:** * **Volkmann Ischemic Contracture (VIC):** This is a devastating sequela of **Compartment Syndrome**. Fractures of the forearm (radius and ulna) are high-risk areas for increased intracompartmental pressure. If left untreated, ischemia leads to muscle infarction and eventual fibrosis/contracture of the forearm flexors. * **Myositis Ossificans:** This refers to heterotopic ossification within the soft tissues/muscles. It is particularly common in fractures around the elbow (radial head/neck) or when there is significant soft tissue trauma and hematoma formation. * **Infection:** This is a potential complication in any **open fracture** of the radius or following **Open Reduction and Internal Fixation (ORIF)** using plates and screws. ### **Clinical Pearls for NEET-PG:** * **Colles’ Fracture:** The most common complication is **Stiffness** (shoulder-hand syndrome), followed by **Malunion** (Dinner fork deformity). The most common late tendon complication is rupture of the **Extensor Pollicis Longus (EPL)**. * **Galeazzi Fracture:** (Distal radius fracture + DRUJ dislocation) often requires ORIF because it is inherently unstable. * **Monteggia Fracture:** (Proximal ulna fracture + Radial head dislocation) carries a risk of **Posterior Interosseous Nerve (PIN)** injury. * **VIC Sign:** The "Volkmann’s sign" is present when passive extension of the fingers is painful and limited unless the wrist is flexed.

Q: Which of the following positions is classically seen in posterior dislocation of the hip?

Posterior dislocation of the hip. In Orthopaedics, the clinical presentation of hip injuries is a high-yield topic for NEET-PG. The correct answer is **Posterior dislocation of the hip**, which is the most common type of hip dislocation (approx. 90%). ### **1. Why Posterior Dislocation is Correct** The classic clinical deformity in posterior dislocation is **Flexion, Adduction, and Internal Rotation (FADIR)**. This occurs because the femoral head is forced out of the acetabulum posteriorly, causing the limb to shorten and the femur to rotate medially. * **Mechanism:** Usually a "dashboard injury" where a force is applied to the flexed knee (e.g., RTA). ### **2. Why Other Options are Incorrect** * **Fracture of the Neck of Femur:** Presents with **Flexion, Abduction, and External Rotation**. The limb appears shortened, but unlike dislocation, it is rotated laterally. * **Anterior Dislocation of the Hip:** Presents with **Flexion, Abduction, and External Rotation (FABER)**. The femoral head is displaced anteriorly, often making it palpable in the inguinal region. * **Congenital Dislocation of the Hip (DDH):** Typically presents in neonates/infants with limited abduction, limb length discrepancy (Galeazzi sign), and positive Ortolani/Barlow maneuvers, rather than an acute traumatic deformity. ### **3. Clinical Pearls for NEET-PG** * **Mnemonic for Posterior Dislocation:** **"P-I"** (Posterior = Internal Rotation). * **Mnemonic for Anterior Dislocation/Neck Fracture:** **"A-E"** (Anterior/Neck = External Rotation). * **Nerve Injury:** The **Sciatic nerve** (specifically the peroneal component) is most commonly injured in posterior dislocations. * **Emergency:** Hip dislocation is a surgical emergency due to the high risk of **Avascular Necrosis (AVN)** of the femoral head. Reduction should ideally occur within 6 hours.

Q: Maximum shortening of the lower limb is seen in fractures of which part of the femur?

Shaft of femur. **Explanation:** The degree of shortening in femoral fractures is primarily determined by the **magnitude of muscle pull** acting on the bone fragments. **1. Why Shaft of Femur is Correct:** The femoral shaft is surrounded by the body's most powerful muscle groups (quadriceps, hamstrings, and adductors). When a fracture occurs here, these muscles undergo intense spasm, causing significant **proximal migration** (overlapping) of the distal fragment. This results in the maximum clinical shortening, often ranging from **3 to 5 cm** or more. **2. Analysis of Incorrect Options:** * **Neck of Femur (B) & Transcervical (D):** These are intracapsular fractures. The strong hip capsule and the iliofemoral ligament (Bigelow's ligament) act as a sleeve that limits the upward displacement of the distal fragment. Shortening is typically minimal, usually **1 to 2 cm**. * **Intertrochanteric Region (C):** While these are extracapsular and can show more shortening than neck fractures (due to the pull of the gluteal muscles), the displacement is still generally less than that seen in mid-shaft fractures where the entire length of the thigh muscles contributes to the deformity. **3. Clinical Pearls for NEET-PG:** * **Shortening Rule of Thumb:** Shaft (>3 cm) > Intertrochanteric (2–3 cm) > Neck of Femur (1–2 cm). * **Deformity Profile:** Neck of femur fractures present with **external rotation of 45°**, whereas Intertrochanteric fractures present with more exaggerated **external rotation of nearly 90°** (as the fracture is outside the capsule). * **Thomas Splint:** Specifically designed to counteract the powerful muscle pull in shaft fractures to maintain length and prevent further soft tissue injury.

Q: Which of the following statements regarding shoulder dislocation is true?

All of the above.. The correct answer is **D. All of the above.** Shoulder dislocations are a high-yield topic for NEET-PG, particularly the distinction between anterior and posterior types. ### **Detailed Explanation** * **Posterior dislocation is often overlooked (Option A):** Unlike anterior dislocations, which present with a prominent "squared-off" shoulder, posterior dislocations have subtle clinical findings. They are frequently missed (up to 50% of cases) because the arm is held in internal rotation and adduction, which can be mistaken for a simple soft tissue injury or frozen shoulder. * **Pain is severe in anterior dislocation (Option B):** Anterior dislocation (the most common type, >95%) is associated with intense pain, muscle spasms, and a complete inability to move the arm. The patient typically holds the arm in slight abduction and external rotation. * **Radiography may be misleading in posterior dislocation (Option C):** On a standard Anteroposterior (AP) view, a posterior dislocation can look deceptively normal. Key subtle signs include the **"Light Bulb Sign"** (the internally rotated humeral head looks circular) and the **"Empty Glenoid Sign."** An **Axillary view** or Scapular Y-view is essential to confirm the diagnosis. ### **NEET-PG High-Yield Pearls** * **Mechanism for Posterior Dislocation:** Classically occurs during **Seizures, Electric shocks**, or high-energy trauma (Triple 'E': Epilepsy, Electricity, Ethanol). * **Most Common Nerve Injury:** **Axillary nerve** (tested by sensation over the "Regimental Badge" area), most common in anterior dislocations. * **Hill-Sachs Lesion:** A compression fracture of the posterosuperolateral humeral head (seen in anterior dislocations). * **Reverse Hill-Sachs (McLaughlin Lesion):** An impaction fracture of the anterior humeral head (seen in posterior dislocations). * **Bankart Lesion:** Avulsion of the anterior-inferior glenoid labrum.

Q: In a fracture of the femur, which fragment commonly damages the popliteal artery?

Distal fragment. In a **supracondylar fracture of the femur**, the anatomical relationship between the bone and the neurovascular bundle is critical for clinical practice. ### **Why the Distal Fragment is Correct** The popliteal artery is fixed in the popliteal fossa, lying in close proximity to the posterior surface of the femur. When a supracondylar fracture occurs, the **distal fragment** is characteristically tilted **posteriorly**. This displacement is caused by the powerful traction of the **gastrocnemius muscle**, which originates from the femoral condyles. This posterior tilting forces the sharp proximal edge of the distal fragment directly into the popliteal artery, leading to arterial occlusion, transection, or intimal injury. ### **Explanation of Incorrect Options** * **Proximal Fragment:** The proximal fragment is usually displaced anteriorly and laterally due to the pull of the quadriceps and adductors. It is further away from the popliteal vessels. * **Muscle Hematoma & Tissue Swelling:** While these can cause Compartment Syndrome (secondary compression), they do not cause the direct mechanical "piercing" or "kinking" injury to the artery associated with this specific fracture pattern. ### **NEET-PG High-Yield Pearls** * **The "Golden Rule":** Always check the distal pulses (Dorsalis Pedis and Posterior Tibial) in any distal femur or knee injury. * **Associated Nerve Injury:** The peroneal nerve is also at risk, though vascular injury is the most limb-threatening complication. * **Management:** This is a surgical emergency. If pulses are absent, an urgent **Angiography** or surgical exploration is required. * **Fixation:** These fractures are typically managed with a Distal Femoral Nail (DFN) or a Locking Compression Plate (LCP).

Question 1

Which of the following elbow injuries involves the three-point relationship?

Accepted Answer

Supracondylar fracture of the humerus

Answer

Fracture of the lateral epicondyle

Answer

Fracture of the medial epicondyle

Answer

Posterior dislocation of the elbow

Question 2

What are the complications of fracture of the radius?

Accepted Answer

All of the above

Answer

Volkmann ischemic contracture

Answer

Myositis ossificans

Answer

Infection

Question 3

Which of the following positions is classically seen in posterior dislocation of the hip?

Accepted Answer

Posterior dislocation of the hip

Answer

Fracture of the neck of femur

Answer

Anterior dislocation of the hip

Answer

Congenital dislocation of the hip

Question 4

A 35-year-old male presented with a fracture of the bilateral femur following a road traffic accident. After 3 days of hospitalization, he developed acute onset dyspnea, fever, and a petechial rash in the chest region. Which of the following is the most probable diagnosis?

Accepted Answer

Fat embolism

Answer

Air embolism

Answer

Deep venous thrombosis

Answer

Saddle thrombus

Question 5

What is a Galeazzi fracture?

Accepted Answer

Fracture of the distal third of the radius with distal radioulnar joint (DRUJ) subluxation

Answer

Fracture of the proximal third of the radius with distal radioulnar joint (DRUJ) subluxation

Answer

Fracture of the distal third of the radius without distal radioulnar joint (DRUJ) subluxation

Answer

Fracture of the proximal third of the radius without distal radioulnar joint (DRUJ) subluxation

Question 6

Fracture of the femur at the level of the isthmus is best treated by?

Accepted Answer

Intramedullary nail fixation

Answer

Plate and screws

Answer

Closed reduction

Answer

External fixation

Question 7

Maximum shortening of the lower limb is seen in fractures of which part of the femur?

Accepted Answer

Shaft of femur

Answer

Neck of femur

Answer

Intertrochanteric region of femur

Answer

Transcervical fracture of femur

Question 8

Which of the following statements regarding shoulder dislocation is true?

Accepted Answer

All of the above.

Answer

Posterior dislocation is often overlooked.

Answer

Pain is severe in anterior dislocation.

Answer

Radiography may be misleading in posterior dislocation.

Question 9

Which of the following is NOT typically done in a patient presenting with Volkmann's ischemia?

Accepted Answer

Sympathetic ganglion blockade

Answer

Split open the plaster of Paris cast and bandage

Answer

Decompression by fasciotomy

Answer

Exploration

Question 10

In a fracture of the femur, which fragment commonly damages the popliteal artery?

Accepted Answer

Distal fragment

Answer

Proximal fragment

Answer

Muscle hematoma

Answer

Tissue swelling

Trauma — MCQs

Trauma — MCQs

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