Trauma Practice Questions

Q: Which nerve is most commonly injured in an anterior shoulder dislocation?

Axillary nerve. **Explanation:** **1. Why Axillary Nerve is Correct:** The axillary nerve (C5-C6) is the most commonly injured nerve in anterior shoulder dislocations due to its unique anatomical course. It winds around the **surgical neck of the humerus** within the quadrangular space. When the humeral head displaces anteroinferiorly, it directly stretches or compresses the nerve against the neck of the humerus. Injury typically manifests as: * **Motor loss:** Weakness in shoulder abduction (Deltoid) and external rotation (Teres minor). * **Sensory loss:** Numbness over the lateral aspect of the upper arm, known as the **"Regimental Badge area."** **2. Why Other Options are Incorrect:** * **Radial Nerve:** Most commonly injured in **mid-shaft humerus fractures** (as it travels in the spiral groove) or Holstein-Lewis fractures. * **Ulnar Nerve:** Typically injured in fractures of the **medial epicondyle** of the humerus or elbow dislocations. * **Median Nerve:** Most frequently associated with **supracondylar fractures** of the humerus (specifically the anterior interosseous nerve branch). **3. Clinical Pearls for NEET-PG:** * **Most common type of shoulder dislocation:** Anterior (95%), specifically the subcoracoid variant. * **Associated Vascular Injury:** The **Axillary artery** is the most common vascular structure injured (especially in elderly patients with atherosclerotic vessels). * **Hill-Sachs Lesion:** A compression fracture of the posterolateral humeral head. * **Bankart Lesion:** Avulsion of the anteroinferior glenoid labrum. * **Management:** Immediate closed reduction (e.g., Kocher’s or Hippocratic method) followed by neurovascular assessment. Always check for the "Regimental Badge" sign before and after reduction.

Q: What is the most common complication of a transcervical fracture of the femur?

Avascular necrosis. **Explanation:** The correct answer is **Avascular Necrosis (AVN)**. **1. Why Avascular Necrosis is the correct answer:** The femoral head's blood supply is precarious and retrograde. It primarily depends on the **medial circumflex femoral artery**, which gives off retinacular vessels that travel along the femoral neck. A transcervical (intracapsular) fracture frequently disrupts these vessels. Furthermore, the intracapsular location means the fracture is bathed in synovial fluid, which lacks pro-coagulant factors, and the resulting intracapsular pressure (tamponade) further compromises blood flow. This leads to ischemia and subsequent necrosis of the femoral head. **2. Why other options are incorrect:** * **Non-union:** While non-union is a very common complication of neck of femur fractures (due to lack of cambium layer in the periosteum and the presence of synovial fluid), **AVN occurs more frequently** and is considered the most characteristic "dreaded" complication. * **Malunion:** This is **rare** in femoral neck fractures. Because the fracture is intracapsular and the bone is cortical, it either heals in the correct position (if stabilized) or fails to heal at all (non-union). Malunion is more common in extracapsular fractures like intertrochanteric fractures. **3. NEET-PG High-Yield Pearls:** * **Garden’s Classification:** Used to assess the risk of AVN (Stage III and IV have the highest risk). * **Pauwels’ Classification:** Based on the angle of the fracture line; higher angles indicate greater shear forces and higher risk of non-union. * **Best Investigation for Early AVN:** MRI (shows changes much earlier than X-rays). * **Management Rule:** In young patients, attempt **internal fixation** (Screws/DHS) to save the head; in elderly patients, perform **replacement** (Hemiarthroplasty/THR) due to the high risk of AVN and non-union.

Q: All are features of a haemophilic knee joint, EXCEPT?

Juxta-articular osteosclerosis. In Haemophilic Arthropathy, the primary pathology is recurrent intra-articular bleeding (haemarthrosis). This leads to chronic synovitis, synovial hypertrophy, and the deposition of **haemosiderin**, which is toxic to the articular cartilage. **Why Option A is the Correct Answer:** The hallmark of haemophilic arthropathy is **Juxta-articular Osteopenia** (decreased bone density), not osteosclerosis. The chronic hyperaemia (increased blood flow) caused by persistent synovial inflammation leads to local bone resorption and thinning of the trabeculae. Osteosclerosis (thickening of bone) is typically seen in primary osteoarthritis, but in haemophilia, the bone remains osteoporotic. **Explanation of Other Options (Radiological Features):** * **Subchondral Cyst Formation (B):** Haemosiderin-induced cartilage destruction allows synovial fluid or blood to be forced into the subchondral bone under pressure, creating "geodes" or cysts. * **Widening of the Intercondylar Notch (C):** This is a classic sign. Chronic hyperaemia at the attachment sites of the cruciate ligaments leads to erosions and widening of the femoral intercondylar notch. * **Squaring of the Patella (D):** Also known as the **Jordan’s Sign**, this occurs due to premature closure of the epiphyseal plates or overgrowth of the inferior pole of the patella caused by increased blood supply to the joint. **NEET-PG High-Yield Pearls:** * **Earliest Sign:** Soft tissue swelling due to synovial thickening. * **Arnold-Hilgartner Classification:** Used to stage haemophilic arthropathy (Stage I to V). * **Target Joint:** Defined as a joint in which 3 or more spontaneous bleeds occur within a 6-month period (Knee is the most common). * **Differential Diagnosis:** Juvenile Idiopathic Arthritis (JIA) also presents with similar features like epiphyseal overgrowth and squaring of the patella, but lacks the specific history of bleeding diathesis.

Q: Which of the following fractures requires a direct force for its occurrence?

Clavicle fracture. **Explanation:** The mechanism of injury in fractures is broadly classified into **direct force** (blow at the site of impact) and **indirect force** (force transmitted from a distance, such as a fall on an outstretched hand). **Why Clavicle Fracture is the Correct Answer:** The clavicle is the most commonly fractured bone in the body. While it can occur via indirect force (fall on the shoulder), it frequently results from a **direct blow** to the shoulder or the bone itself (e.g., sports injuries or road traffic accidents). In the context of this specific question, the clavicle is the most superficial bone among the options, making it highly susceptible to direct impact. **Analysis of Incorrect Options:** * **Fracture Neck of Femur (A) & Intertrochanteric Fracture (B):** These are typically injuries of the elderly resulting from **indirect force**, such as a trivial fall or a rotational trip. The force is transmitted through the long axis of the femur or via torsional stress. * **Colles Fracture (D):** This is the classic example of an **indirect force** injury. It occurs due to a **Fall On an Outstretched Hand (FOOSH)**, where the force travels from the palm through the carpal bones to the distal radius. **NEET-PG High-Yield Pearls:** * **Clavicle:** Most common site of fracture is the junction of the medial 2/3 and lateral 1/3 (the weakest point where the curvature changes). * **Colles Fracture:** Characterized by "Dinner Fork Deformity" with dorsal displacement and tilt. * **Mechanism Rule:** Most long bone fractures in the elderly (Hip, Wrist) are due to indirect force (FOOSH/Falls), whereas fractures in subcutaneous bones (Clavicle, Tibia shaft) are often due to direct impact.

Q: Which of the following are key components of fracture treatment?

Reduction, Retention, Rehabilitation. The management of fractures follows a fundamental triad often referred to as the **"Three R’s" of Fracture Treatment**. This systematic approach ensures the restoration of anatomy and function. ### 1. Why Option A is Correct: The correct sequence is **Reduction, Retention, and Rehabilitation**: * **Reduction:** This is the first step, involving the restoration of the displaced bone fragments to their normal anatomical alignment. It can be **Closed** (manual manipulation) or **Open** (surgical). * **Retention (Immobilization):** Once reduced, the fragments must be held in place to prevent displacement while healing occurs. This is achieved through external means (plaster casts, splints) or internal/external fixation. * **Rehabilitation:** This is the final, crucial phase. It involves physiotherapy and joint mobilization to prevent stiffness, muscle atrophy, and to restore the patient to their pre-injury functional state. ### 2. Why Other Options are Incorrect: * **Reunion (Options B, C, and D):** While "union" (healing of the bone) is the desired *outcome* of fracture treatment, it is a biological process, not a treatment component performed by the surgeon. The surgeon provides the environment (Reduction and Retention) for union to occur naturally. ### 3. Clinical Pearls for NEET-PG: * **Primary Goal:** The ultimate goal of fracture management is to return the injured part to maximal functional capacity. * **Emergency Rule:** Always check the **Distal Neurovascular Status** before and after any reduction maneuver. * **The 4th 'R':** In some modern texts, **Recognition** (Diagnosis via clinical exam and X-rays) is considered the "Zero-th" step before Reduction. * **High-Yield Fact:** For intra-articular fractures, **Anatomical Reduction** is mandatory to prevent early-onset secondary osteoarthritis.

Q: Trimalleolar fracture is:

Cotton's fracture. **Explanation:** A **Trimalleolar fracture** involves fractures of the medial malleolus, lateral malleolus, and the posterior lip of the tibia (often referred to as the "posterior malleolus"). * **Cotton’s Fracture (Correct Answer):** This is the eponymous name for a trimalleolar fracture. It was described by Frederic Jay Cotton in 1915. The inclusion of the posterior malleolus makes the ankle joint significantly more unstable compared to bimalleolar injuries, often requiring surgical fixation of all three components to restore the articular surface of the tibial plafond. **Analysis of Incorrect Options:** * **Pott’s Fracture:** A general term for fractures around the ankle involving at least two malleoli (bimalleolar). While often used interchangeably with ankle fractures, it specifically refers to a fracture-dislocation caused by eversion forces. * **Tillaux Fracture:** An avulsion fracture of the **anterolateral** aspect of the distal tibial epiphysis. It is caused by the pull of the anterior inferior tibiofibular ligament (AITFL) and is typically seen in adolescents during the period of growth plate closure. * **Jones Fracture:** A transverse fracture through the **base of the fifth metatarsal** (specifically at the junction of the diaphysis and metaphysis, Zone 2). It is notorious for high rates of non-union due to a watershed blood supply. **High-Yield Clinical Pearls for NEET-PG:** 1. **Lauge-Hansen Classification:** The most common system used to describe ankle fractures based on the foot position and the direction of the deforming force. 2. **Maisonneuve Fracture:** A high fibular fracture associated with a medial malleolus fracture or deltoid ligament tear; always palpate the proximal fibula in ankle injuries. 3. **Pilon Fracture:** A comminuted intra-articular fracture of the distal tibia caused by high-energy axial loading (e.g., fall from height).

Q: All of the following conditions can lead to genu recurvatum, except?

Perthes disease. **Explanation:** **Genu recurvatum** is a deformity of the knee joint characterized by excessive hyperextension (beyond 10–15 degrees). It typically results from ligamentous laxity, muscular imbalance, or malunion of fractures around the knee. **Why Perthes Disease is the Correct Answer:** Perthes disease (Legg-Calvé-Perthes) is an idiopathic avascular necrosis of the **femoral head** in children. It primarily affects the **hip joint**, leading to a limp, pain, and restricted abduction and internal rotation. It does not involve the knee joint or the mechanical axis of the tibia/femur in a way that causes hyperextension; therefore, it is not a cause of genu recurvatum. **Analysis of Other Options:** * **Poliomyelitis:** This is a classic cause. Weakness of the quadriceps leads the patient to lock their knee in hyperextension to maintain stability during the stance phase of gait. Over time, this stretches the posterior capsule, resulting in recurvatum. * **Rheumatoid Arthritis:** Chronic inflammation leads to ligamentous laxity and joint destruction. If the posterior cruciate ligament (PCL) or posterior capsule becomes incompetent, the knee can drift into hyperextension. * **Rickets:** Nutritional deficiencies lead to softened bones. Weight-bearing on weak physes can cause anterior bowing of the femur or tibia, or a "tilting" of the tibial plateau, resulting in a recurvatum deformity. **Clinical Pearls for NEET-PG:** * **Most common cause worldwide:** Historically, Poliomyelitis (due to muscle imbalance). * **Congenital Genu Recurvatum:** Often associated with developmental dysplasia of the hip (DDH). * **Hand-to-knee gait:** Seen in Polio patients with quadriceps weakness to prevent the knee from buckling by forcing it into recurvatum. * **Osseous vs. Postural:** Rickets causes *osseous* recurvatum, while Polio causes *postural/ligamentous* recurvatum.

Q: Bennet's fracture involves which metacarpal bone?

1st metacarpal. **Explanation:** **Bennett’s fracture** is a specific injury defined as an **intra-articular fracture-dislocation** at the base of the **1st metacarpal** (the thumb). The fracture line separates a small, triangular volar-ulnar fragment, which remains attached to the strong anterior oblique ligament. Meanwhile, the rest of the metacarpal shaft is displaced proximally and radially by the pull of the **Abductor Pollicis Longus (APL)** muscle. This instability makes it a classic "fracture-dislocation." **Why other options are incorrect:** * **2nd and 3rd Metacarpals:** These bones are relatively fixed at the carpo-metacarpal joints and are not associated with Bennett’s or Rolando’s fractures. Fractures here are usually shaft or neck fractures. * **4th and 5th Metacarpals:** Fractures of the neck of the 5th (and sometimes 4th) metacarpal are known as **Boxer’s fractures**, typically caused by a direct blow with a clenched fist. **High-Yield Clinical Pearls for NEET-PG:** 1. **Rolando Fracture:** A comminuted (T or Y-shaped) intra-articular fracture at the base of the 1st metacarpal. It carries a worse prognosis than Bennett's. 2. **Mechanism:** Usually caused by axial loading along the longitudinal axis of the thumb (e.g., a punch or a fall). 3. **Treatment:** Because it is inherently unstable due to the pull of the APL, it often requires **Closed Reduction and Internal Fixation (CRIF)** with K-wires or Open Reduction (ORIF). 4. **Gamekeeper’s/Skier’s Thumb:** An injury to the **Ulnar Collateral Ligament (UCL)** of the 1st metacarpophalangeal (MCP) joint, not the metacarpal base.

Question 1

Patella commonly dislocates:

Accepted Answer

Laterally

Answer

Medially

Answer

Superiorly

Answer

Inferiorly

Question 2

Which nerve is most commonly injured in an anterior shoulder dislocation?

Accepted Answer

Axillary nerve

Answer

Ulnar nerve

Answer

Median nerve

Answer

Radial nerve

Question 3

What is the most common complication of a transcervical fracture of the femur?

Accepted Answer

Avascular necrosis

Answer

Non-union

Answer

Malunion

Answer

All of the above

Question 4

All of the following can occur as complications of fracture of the neck of femur except?

Accepted Answer

Mal-union

Answer

Shortening

Answer

Non-union

Answer

Avascular necrosis

Question 5

All are features of a haemophilic knee joint, EXCEPT?

Accepted Answer

Juxta-articular osteosclerosis

Answer

Subchondral cyst formation

Answer

Widening of the intercondylar notch

Answer

Squaring of the patella

Question 6

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

Accepted Answer

Clavicle fracture

Answer

Fracture neck of femur

Answer

Intertrochanteric fracture

Answer

Colles fracture

Question 7

Which of the following are key components of fracture treatment?

Accepted Answer

Reduction, Retention, Rehabilitation

Answer

Reduction, Rehabilitation, Reunion

Answer

Reduction, Retention, Reunion

Answer

Retention, Rehabilitation, Reunion

Question 8

Trimalleolar fracture is:

Accepted Answer

Cotton's fracture

Answer

Pott's fracture

Answer

Tillaux fracture

Answer

Jones fracture

Question 9

All of the following conditions can lead to genu recurvatum, except?

Accepted Answer

Perthes disease

Answer

Rheumatoid arthritis

Answer

Poliomyelitis

Answer

Rickets

Question 10

Bennet's fracture involves which metacarpal bone?

Accepted Answer

1st metacarpal

Answer

2nd metacarpal

Answer

3rd metacarpal

Answer

4th metacarpal

Trauma — MCQs

Trauma — MCQs

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