Trauma Practice Questions

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).

Q: Which of the following features is essential in the diagnosis of a fracture of a bone?

Partial or complete loss of continuity of the bone. ### Explanation **Correct Answer: C. Partial or complete loss of continuity of the bone** **Why it is correct:** By definition, a fracture is a **break in the structural continuity of a bone**. This may range from a simple crack (stress fracture or greenstick fracture) to a complex comminution. While clinical signs like pain and swelling suggest an injury, the **essential diagnostic criterion**—both pathologically and radiologically—is the disruption of the bone's cortex or internal architecture. **Analysis of Incorrect Options:** * **A. Deformity:** While common in displaced fractures, many fractures (such as impacted, hairline, or undisplaced fractures) present with no visible deformity. Conversely, joint dislocations can cause significant deformity without an actual bone fracture. * **B. Crepitus:** This is the grating sensation/sound produced by the friction of fractured bone ends. Although it is a **pathognomonic** sign of a fracture, it is not "essential" for diagnosis. In fact, seeking crepitus is discouraged clinically as it causes significant pain and can worsen soft tissue injury or neurovascular damage. It is also absent in impacted or incomplete fractures. **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic signs of fracture:** Abnormal mobility and crepitus (but these are not essential for diagnosis). * **Standard Imaging:** Always obtain at least two views (**Anteroposterior and Lateral**) and include the **joint above and the joint below** the injury site (Rule of Two). * **Tenderness:** Localized "point tenderness" over a bone is the most sensitive clinical sign for a fracture in a conscious patient. * **Greenstick Fracture:** A common pediatric fracture where the continuity is only partially lost (one side of the cortex remains intact).

Q: Fracture of the shaft of the humerus is most commonly associated with injury to which of the following nerves?

Radial nerve. **Explanation:** The **Radial nerve** is the most commonly injured nerve in fractures of the humeral shaft, particularly those involving the **middle and distal thirds**. This is due to the intimate anatomical relationship where the nerve winds around the posterior aspect of the humerus in the **spiral groove** (radial groove). In this location, the nerve is in direct contact with the periosteum, making it highly susceptible to injury from displaced fracture fragments or entrapment in the callus. **Analysis of Options:** * **Radial Nerve (Correct):** Its proximity to the spiral groove makes it the primary nerve at risk. Injury typically results in **wrist drop** and loss of sensation over the first dorsal web space. * **Ulnar Nerve:** Usually injured in fractures of the **medial epicondyle** or supracondylar fractures (Tardy Ulnar Palsy). * **Median Nerve:** More commonly associated with **supracondylar fractures** of the humerus (along with the brachial artery) rather than shaft fractures. * **Musculocutaneous Nerve:** Rarely injured in humeral fractures as it is well-protected by the biceps and brachialis muscles. **Clinical Pearls for NEET-PG:** 1. **Holstein-Lewis Fracture:** A spiral fracture of the **distal 1/3rd** of the humeral shaft specifically associated with radial nerve neuropraxia. 2. **Management:** Most radial nerve palsies associated with closed humeral shaft fractures are **neuropraxias** and resolve spontaneously (85-90% recovery rate). Immediate exploration is generally not indicated unless it is an open fracture or a nerve palsy develops *after* manipulation. 3. **Splinting:** The **Sarmiento brace** (functional bracing) is the gold standard for definitive non-operative management of humeral shaft fractures.

Question 1

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 2

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 3

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 4

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 5

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 6

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 7

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

Question 8

Which of the following features is essential in the diagnosis of a fracture of a bone?

Accepted Answer

Partial or complete loss of continuity of the bone

Answer

Deformity

Answer

Crepitus

Answer

None of the above

Question 9

Fracture of the shaft of the humerus is most commonly associated with injury to which of the following nerves?

Accepted Answer

Radial nerve

Answer

Ulnar nerve

Answer

Median nerve

Answer

Musculocutaneous nerve

Question 10

Which of the following statements about post-traumatic fat embolism syndrome are true?

Accepted Answer

Fracture mobility, thrombocytopenia, and PaO2 on ABG are true; associated diabetes and bradycardia are false.

Answer

Fracture mobility, associated diabetes, and bradycardia are true; thrombocytopenia and PaO2 on ABG are false.

Answer

All statements are false.

Answer

All statements are true.

Trauma — MCQs

Trauma — MCQs

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