Trauma Practice Questions

Q: Which treatment plan would lead to rigid fixation of the fracture site?

Eccentric compression plate osteosynthesis. ### Explanation **Concept of Rigid vs. Biological Fixation** In orthopaedics, **rigid (absolute) stability** is achieved when there is no movement at the fracture site under physiological loads. This leads to **primary bone healing** (direct cortical remodeling without callus formation). **Eccentric compression plating** (Option C) achieves this by utilizing the "tension band principle" or specialized plate holes (like the Dynamic Compression Plate) to exert active pressure across the fracture ends, resulting in absolute stability. **Why the other options are incorrect:** * **Direct interdental wiring (Option A):** This provides only **non-rigid** fixation. It stabilizes the teeth but does not provide enough compression or stability to prevent micro-motion at the bone level. * **Miniplates osteosynthesis (Option B):** These provide **semi-rigid** (functionally stable) fixation. They are designed to neutralize forces along the lines of tension (Champy’s lines) but allow for some microscopic movement, usually leading to secondary bone healing with callus. * **Intermaxillary fixation (Option D):** This is a form of **conservative/indirect** stabilization. While it immobilizes the jaw, it does not provide internal rigid compression at the fracture interface. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Bone Healing:** Requires absolute stability (e.g., Compression plates, Lag screws). No callus is seen on X-ray. * **Secondary Bone Healing:** Occurs with relative stability (e.g., IM nails, Casts, External fixators). Callus formation is visible. * **Gold Standard for Mandible:** While miniplates are the most common clinical practice (load-sharing), **compression plates** (load-bearing) are the classic answer for "rigid fixation." * **Absolute Stability Rule:** Always remember: "Compression = Absolute Stability = Primary Healing."

Q: The most serious complication of a pelvic fracture is:

Hypovolemic shock. ### Explanation **Correct Answer: C. Hypovolemic shock** **Why it is correct:** Pelvic fractures, particularly high-energy "open book" or unstable fractures, are associated with massive internal hemorrhage. The pelvis is a highly vascular area containing the **presacral venous plexus** and the **internal iliac arteries**. A fracture can increase the pelvic volume significantly, allowing for the sequestration of up to 4 liters of blood (nearly the entire circulating volume) within the retroperitoneal space. **Hemorrhagic (hypovolemic) shock** is the leading cause of early mortality in these patients, making it the most serious and life-threatening complication. **Why the other options are incorrect:** * **A. Rupture of the urinary bladder:** While urogenital injuries (bladder or urethral rupture) are common in pelvic trauma, they are rarely immediately life-threatening compared to massive hemorrhage. * **B. Neurogenic shock:** This typically occurs in spinal cord injuries due to loss of sympathetic tone. While pelvic fractures can cause nerve root injuries (e.g., sacral plexus), they do not typically cause neurogenic shock. * **D. Malunion:** This is a late/delayed complication. While it leads to chronic pain and gait abnormalities, it does not pose an immediate threat to the patient's life. **High-Yield Clinical Pearls for NEET-PG:** * **Source of Bleeding:** 80–90% of hemorrhage in pelvic fractures is **venous** (Presacral plexus), while 10–20% is arterial (Internal iliac artery branches, most commonly the **Superior Gluteal Artery**). * **Initial Management:** The first step in stabilizing an unstable pelvic fracture in the ER is the application of a **Pelvic Binder** (at the level of the greater trochanters) to decrease pelvic volume and provide tamponade. * **Associated Injury:** The most common site of urethral injury in pelvic fractures is the **membranous urethra** (at the puboprostatic junction).

Q: In osteosynthesis, which of the following is NOT used?

Eyelet wiring. **Explanation:** **Osteosynthesis** refers to the surgical reduction and internal fixation of a bone fracture using mechanical devices (implants) to achieve stable fixation and promote healing. **Why Option D is Correct:** **Eyelet wiring** (also known as Ivy loops) is a technique used in **Maxillofacial surgery** for **Intermaxillary Fixation (IMF)**. It involves wiring the upper and lower teeth together to stabilize the jaw. While it stabilizes a fracture site, it is a form of external/dental stabilization rather than osteosynthesis, which specifically refers to the internal fixation of the bone fragments themselves using plates, screws, or nails. **Why Other Options are Incorrect:** * **A. Lag Screw:** This is a fundamental tool in osteosynthesis. It produces **interfragmentary compression** by gliding through the near cortex and engaging only the far cortex, squeezing the bone fragments together. * **B. Wires:** Cerclage wires or K-wires (Kirschner wires) are frequently used in osteosynthesis, especially in tension band wiring (e.g., patella or olecranon fractures) or to hold fragments in place temporarily. * **C. Clamp Bone Plate:** Various types of plates (Dynamic Compression Plates, Locking Plates) are the hallmark of internal fixation. They "clamp" or bridge the fracture to provide rigid stability. **NEET-PG High-Yield Pearls:** * **Gold Standard for Osteosynthesis:** The **AO (Arbeitsgemeinschaft für Osteosynthesefragen)** principles focus on anatomical reduction, stable fixation, preservation of blood supply, and early mobilization. * **Primary Bone Healing:** Occurs only with absolute stability (e.g., compression plating/lag screws) without callus formation. * **Secondary Bone Healing:** Occurs with relative stability (e.g., intramedullary nailing or casts) and involves callus formation.

Q: What is the most common site for avascular necrosis of the femur?

Subcapital. **Explanation:** The risk of **Avascular Necrosis (AVN)** in femoral neck fractures is primarily determined by the proximity of the fracture line to the femoral head and the degree of disruption to the blood supply. **1. Why Subcapital is Correct:** The femoral head receives its primary blood supply from the **retinacular vessels** (branches of the medial circumflex femoral artery). These vessels run along the neck of the femur to reach the head. In a **subcapital fracture**, the fracture line occurs immediately below the articular surface of the head. This location is most likely to completely sever the retinacular vessels, leaving the head dependent solely on the meager supply from the *ligamentum teres*. Consequently, subcapital fractures have the highest incidence of AVN (up to 30-40%). **2. Analysis of Incorrect Options:** * **Transcervical:** The fracture occurs through the mid-portion of the neck. While the risk of AVN is high, it is statistically lower than subcapital fractures because some distal retinacular branches may remain intact. * **Basal (Basocervical):** These occur at the junction of the neck and the trochanteric region. Being further from the head, the vascular compromise is less severe. * **Trochanteric:** These are **extracapsular** fractures. Because they occur distal to the insertion of the joint capsule where the blood supply enters, the risk of AVN is negligible. **Clinical Pearls for NEET-PG:** * **Garden’s Classification:** Used for subcapital fractures; Stage III and IV have the highest risk of AVN and non-union. * **Pauwels' Classification:** Based on the angle of the fracture line; higher angles (Type III) indicate greater instability and higher risk of complications. * **Management:** In elderly patients with displaced subcapital fractures, **Arthroplasty** (Hemi or Total) is preferred over internal fixation due to the high risk of AVN.

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).

Question 1

Which treatment plan would lead to rigid fixation of the fracture site?

Accepted Answer

Eccentric compression plate osteosynthesis

Answer

Direct interdental wiring

Answer

Miniplates osteosynthesis

Answer

Intermaxillary fixation (IMF)

Question 2

A Hoffa fracture is defined as:

Accepted Answer

Coronal fracture of the posterior part of the femoral condyles

Answer

Stellate patella fracture

Answer

Metaphyseo-diaphyseal dissociation of the proximal tibia

Answer

Medial collateral ligament avulsion from the femur

Question 3

The most serious complication of a pelvic fracture is:

Accepted Answer

Hypovolemic shock

Answer

Rupture of the urinary bladder

Answer

Neurogenic shock

Answer

Malunion

Question 4

In osteosynthesis, which of the following is NOT used?

Accepted Answer

Eyelet wiring

Answer

Lag screw

Answer

Wires

Answer

Clamp bone plate

Question 5

What is the most common site for avascular necrosis of the femur?

Accepted Answer

Subcapital

Answer

Transcervical

Answer

Trochanteric

Answer

Basal

Question 6

Patella commonly dislocates:

Accepted Answer

Laterally

Answer

Medially

Answer

Superiorly

Answer

Inferiorly

Question 7

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 8

A fall on an outstretched hand can lead to a fracture of which of the following bones?

Accepted Answer

Scaphoid bone, capitate, and clavicle

Answer

Scaphoid and clavicle

Answer

Head of the ulna

Answer

Radial styloid process

Question 9

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 10

Trimalleolar fracture is:

Accepted Answer

Cotton's fracture

Answer

Pott's fracture

Answer

Tillaux fracture

Answer

Jones fracture

Trauma — MCQs

Trauma — MCQs

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