Trauma Practice Questions

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.

Q: Bankart lesion occurs in patients with which of the following?

Anterior shoulder dislocation. **Explanation:** A **Bankart lesion** is the most common pathological finding in recurrent **anterior shoulder dislocation**. It involves an avulsion of the **anteroinferior glenoid labrum** from the underlying glenoid bone. This occurs when the humeral head is forced anteriorly and inferiorly, tearing the labrum and the attached inferior glenohumeral ligament (IGHL) complex. If a fragment of the glenoid bone is also fractured, it is termed a "Bony Bankart." **Analysis of Options:** * **Anterior shoulder dislocation (Correct):** This is the most common type of shoulder dislocation (95%). The mechanism involves forced abduction and external rotation, leading to the Bankart lesion and the associated **Hill-Sachs lesion** (compression fracture of the posterolateral humeral head). * **Posterior shoulder dislocation:** This is associated with a **Reverse Bankart lesion** (detachment of the posterior labrum) and a **Reverse Hill-Sachs lesion** (McLaughlin lesion), typically seen after seizures or electric shocks. * **Posterior elbow dislocation:** This typically involves injury to the medial collateral ligament and potential fractures of the coronoid process or radial head (Terrible Triad), but not a Bankart lesion. * **Posterior hip dislocation:** This is associated with acetabular posterior wall fractures and sciatic nerve injuries. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** MRI Arthrography is the best modality to visualize a Bankart lesion. * **Associated Lesion:** Hill-Sachs lesion (found in ~80% of cases). * **Treatment:** Recurrent cases often require surgical repair (Bankart repair), which can be done arthroscopically or via open surgery (e.g., Putti-Platt or Bristow-Latarjet procedure if there is significant bone loss).

Q: Traumatic myositis ossificans is also known as:

All of the above. **Explanation:** **Traumatic Myositis Ossificans (MO)** refers to the formation of heterotopic lamellar bone within soft tissues (usually muscles) following trauma. It is a non-neoplastic condition where a hematoma undergoes organization and subsequent ossification rather than resorption. The correct answer is **D (All of the above)** because the condition is often named based on the specific occupational or repetitive trauma that triggers it: 1. **Drill Bone:** Occurs in the **deltoid** or pectoral muscles of infantry soldiers due to the repetitive recoil of a rifle during drill practice. 2. **Rider’s Bone:** Occurs in the **adductor muscles** of the thigh (specifically Adductor Longus) in horseback riders due to chronic friction and strain against the saddle. 3. **Exercise Bone:** A general term used when ossification occurs in muscles subjected to heavy, repetitive athletic strain or acute injury during vigorous exercise. **Clinical Pearls for NEET-PG:** * **Common Site:** The most common site for traumatic MO is the **Brachialis** muscle (following supracondylar fracture or elbow dislocation) and the **Quadriceps**. * **Pathophysiology:** It follows the "Zoning Phenomenon"—the lesion is more mature (calcified) at the periphery and immature (cellular) in the center. This distinguishes it from Osteosarcoma, which is more mature at the center. * **Management:** The most important rule is **never to massage** a recent injury or perform forceful passive stretching, as this increases the risk of MO. * **Treatment:** Initial management is rest and NSAIDs (Indomethacin). Surgery is only indicated after the bone has "matured" (usually 6–12 months), evidenced by a well-defined cortex on X-ray and a cold bone scan.

Q: All of the following are true about intertrochanteric fracture of the femur except:

Intracapsular.. ### Explanation **Intertrochanteric (IT) fractures** are extracapsular fractures occurring between the greater and lesser trochanters. **1. Why Option D is the Correct Answer (The "Except"):** The hip joint capsule attaches anteriorly to the intertrochanteric line and posteriorly to the femoral neck (medial to the intertrochanteric crest). Therefore, IT fractures occur **outside the joint capsule (extracapsular)**. This is a critical distinction because, unlike intracapsular neck of femur fractures, IT fractures have a rich blood supply and do not typically lead to avascular necrosis (AVN). **2. Analysis of Other Options:** * **Option A (Commoner than neck of femur):** IT fractures are generally more common than neck of femur fractures, especially in the elderly population with osteoporosis. * **Option B (Treatment):** The gold standard for stable IT fractures is the **Dynamic Hip Screw (DHS)**. For unstable or reverse oblique patterns, the **Proximal Femoral Nail (PFN)** is preferred as it is an intramedullary device providing better biomechanical stability. * **Option C (Malunion):** Because the trochanteric region is composed of cancellous bone with an excellent blood supply, these fractures almost always heal (non-union is rare). However, they frequently heal in a deformed position, most commonly **coxa vara** and shortening, leading to malunion. **Clinical Pearls for NEET-PG:** * **Clinical Presentation:** The affected limb shows marked **shortening and external rotation** (often up to 90 degrees, touching the bed), which is more pronounced than in neck of femur fractures. * **Blood Loss:** Being extracapsular and involving cancellous bone, IT fractures are associated with significant concealed blood loss (up to 1–1.5 liters). * **Evans Classification:** Used to grade the stability of IT fractures. * **Complication:** The most common complication is **malunion**; the rarest is AVN.

Q: Fracture of the upper third of the ulna with proximal radioulnar dislocation is known as:

Monteggia fracture. **Explanation:** The correct answer is **Monteggia fracture**. This injury is defined as a fracture of the proximal third (upper third) of the ulna shaft associated with a dislocation of the radial head at the proximal radioulnar joint (PRUJ). **Understanding the Concept:** In the forearm, the radius and ulna are linked like a closed chain. A significant displaced fracture in one bone usually necessitates a dislocation or fracture in the other. In Monteggia's injury, the ulnar fracture provides the force that displaces the radial head. **Analysis of Incorrect Options:** * **Galeazzi fracture:** This is the "reverse" of a Monteggia. It involves a fracture of the **distal third of the radius** with dislocation of the **distal radioulnar joint (DRUJ)**. * **Barton fracture:** An intra-articular fracture of the distal radius with dislocation/subluxation of the radiocarpal joint. It can be volar (more common) or dorsal. * **Colles fracture:** An extra-articular fracture of the distal radius (within 2 cm of the joint) with characteristic **dorsal displacement** (Dinner fork deformity). It does not involve radioulnar dislocation. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic (MUGR):** **M**onteggia = **U**lna fracture; **G**aleazzi = **R**adius fracture. (The fracture site is the bone named). * **Bado Classification:** Used to classify Monteggia fractures based on the direction of radial head dislocation (Type I/Anterior is the most common). * **Nerve Injury:** The **Posterior Interosseous Nerve (PIN)**, a branch of the radial nerve, is the most commonly injured nerve in Monteggia fractures. * **Management:** In adults, these are unstable injuries requiring **ORIF (Open Reduction and Internal Fixation)** with a plate and screw for the ulna; the radial head usually reduces spontaneously once the ulna length is restored.

Q: Malgaigne feature is associated with which type of fracture?

Pelvis fracture. **Explanation:** **Malgaigne fracture** is a classic, high-energy injury of the **pelvis**. It is defined as a vertical shear fracture-dislocation of the pelvic ring. Specifically, it involves a double vertical fracture: one occurring anteriorly (through the pubic rami) and one occurring posteriorly (through the sacroiliac joint, sacrum, or ilium) on the same side (ipsilateral). This results in an unstable "vertical shear" pattern where one hemipelvis is displaced superiorly. **Analysis of Options:** * **B. Pelvis fracture (Correct):** The mechanism involves a vertical force (like a fall from height onto one leg), causing disruption of both the anterior and posterior pelvic arches. * **A. Shoulder fracture:** While the shoulder can suffer various eponymous fractures (like Hill-Sachs or Bankart lesions), Malgaigne is strictly pelvic. * **C. Spine fracture:** Spine fractures are often associated with pelvic trauma (e.g., Chance fractures or burst fractures), but Malgaigne refers specifically to the pelvic ring. * **D. Scapular fracture:** These are typically caused by direct high-energy trauma to the chest wall but are unrelated to the Malgaigne description. **Clinical Pearls for NEET-PG:** * **Mechanism:** Vertical shear (most unstable pelvic injury). * **Clinical Sign:** Shortening of the affected lower limb (due to superior migration of the hemipelvis) without a hip fracture. * **Radiology:** Look for superior displacement of the hemipelvis and disruption of the sacroiliac joint. * **Complications:** High risk of massive retroperitoneal hemorrhage and internal organ injury. * **Note:** Do not confuse this with **Malgaigne’s Luxation**, which is an older term for an elbow dislocation (Monteggia-like variant), though in modern exams, "Malgaigne" almost exclusively refers to the pelvis.

Question 1

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 2

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 3

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.

Question 4

Bankart lesion occurs in patients with which of the following?

Accepted Answer

Anterior shoulder dislocation

Answer

Posterior shoulder dislocation

Answer

Posterior elbow dislocation

Answer

Posterior hip dislocation

Question 5

Traumatic myositis ossificans is also known as:

Accepted Answer

All of the above

Answer

Drill bone

Answer

Rider's bone

Answer

Exercise bone

Question 6

All of the following are true about intertrochanteric fracture of the femur except:

Accepted Answer

Intracapsular.

Answer

Commoner than fracture of the neck of the femur.

Answer

Treatment is proximal femoral nail or dynamic hip screw.

Answer

Associated with malunion.

Question 7

Fracture of the upper third of the ulna with proximal radioulnar dislocation is known as:

Accepted Answer

Monteggia fracture

Answer

Galeazzi fracture

Answer

Barton fracture

Answer

Colles fracture

Question 8

A 66-year-old female developed pain while walking, with shortening and external rotation of the limb and broadening of the greater trochanter. What is the possible diagnosis?

Accepted Answer

Fracture of the intertrochanteric femur

Answer

Fracture of the neck of the femur

Answer

Acetabular fracture

Answer

Central dislocation of the hip

Question 9

Malgaigne feature is associated with which type of fracture?

Accepted Answer

Pelvis fracture

Answer

Shoulder fracture

Answer

Spine fracture

Answer

Scapular fracture

Question 10

All are true statements regarding Volkmann's ischemic contracture, except?

Accepted Answer

Flexion deformity of the wrist and fingers.

Answer

Ischemic muscle is replaced by fibrous tissue.

Answer

Ulnar nerve palsy may be present.

Answer

Extension at the metacarpophalangeal joints.

Trauma — MCQs

Trauma — MCQs

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