Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 1011: Which of the following is the most common cause of secondary osteoarthritis?

A. Congenital dislocation
B. Inflammatory arthritis
C. Trauma (Correct Answer)
D. Infection

Explanation: ***Trauma*** - **Prior joint injury** (macrotrauma) or repetitive microtrauma is a major risk factor for developing secondary osteoarthritis via post-traumatic arthritis. - Trauma directly damages articular cartilage and alters joint mechanics, accelerating degenerative changes. *Congenital dislocation* - While **developmental dysplasia of the hip** and other congenital joint abnormalities can lead to secondary osteoarthritis, these are less common causes overall compared to trauma. - The abnormal joint morphology and biomechanics lead to uneven stress distribution and accelerated wear. *Inflammatory arthritis* - Conditions like **rheumatoid arthritis** or **gout** can cause secondary osteoarthritis by damaging cartilage and bone through chronic inflammation. - However, the prevalence of these inflammatory conditions as the initiating factor for secondary OA is lower than that of trauma. *Infection* - **Septic arthritis** can destroy joint cartilage rapidly, leading to secondary osteoarthritis. - While a severe cause, its incidence as a predisposing factor for secondary OA is considerably less frequent than trauma-related injuries.

Question 1012: Which fracture is most commonly associated with fat embolism?

A. Humeral shaft fracture
B. Distal radius fracture
C. Femoral shaft fracture (Correct Answer)
D. Clavicle fracture

Explanation: ***Femoral shaft fracture*** - **Femoral shaft fractures** are highly associated with **fat embolism syndrome (FES)** due to the large amount of **yellow marrow** released from the long bone into the circulation following trauma. - The risk of FES is particularly high with **multiple fractures** or **delayed stabilization** of long bone fractures. *Humeral shaft fracture* - While humeral shaft fractures can potentially lead to fat embolism, they are **less common** sources compared to lower limb long bone fractures due to a smaller bone marrow volume. - The incidence of **fat embolism syndrome** with isolated upper limb fractures is generally lower. *Distal radius fracture* - **Distal radius fractures** are typically **low-energy injuries** involving a smaller bone and less marrow, making them a very rare cause of significant fat embolism. - **Fat embolism syndrome** is exceptionally uncommon following fractures of the small bones of the forearm. *Clavicle fracture* - **Clavicle fractures** involve a flat bone with a limited quantity of marrow, and hence they are **not typically associated** with fat embolism. - The risk of **fat embolism syndrome** is negligible with clavicular injuries.

Question 1013: Which treatment is best for a severely displaced and comminuted distal radius fracture in an elderly patient?

A. External fixation
B. Hemiarthroplasty
C. Closed reduction and casting
D. Open reduction and plating (Correct Answer)

Explanation: ***Open reduction and plating*** - This method provides **stable fixation** for displaced fractures, especially in elderly patients with potentially poorer bone quality, allowing for earlier mobilization and better functional outcomes. - **Open reduction** ensures accurate anatomical alignment, and **plating** offers strong internal support to resist displacement. *External fixation* - While it can stabilize fractures, external fixation may have a higher risk of complications such as **pin track infections** and **joint stiffness**, which can be particularly problematic for elderly patients. - It might not provide the same degree of stability as internal plating, potentially leading to less optimal reduction in **comminuted fractures**. *Hemiarthroplasty* - **Hemiarthroplasty** is a joint replacement procedure and is generally reserved for severe, irreparable fractures affecting the joint surface or for cases of **arthritic conditions**, not typically for a standard displaced distal radius fracture. - This option is **overly invasive** for the described injury and is not considered a primary treatment for distal radius fractures. *Closed reduction and casting* - While a common treatment for distal radius fractures, **closed reduction and casting** has a higher risk of **redisplacement** in significantly displaced fractures, especially in elderly patients with osteoporotic bone. - It often requires longer immobilization, potentially leading to **stiffness** and **muscle atrophy**, which can be challenging for older individuals.

Question 1014: A 26-year-old male presented with proximal 1/3rd fracture shaft of the femur. What is the treatment of choice in this patient?

A. Hip Spica
B. Above knee Cast
C. Above knee Slab
D. Interlocking Nail (Correct Answer)

Explanation: ***Interlocking Nail*** - **Interlocking nailing** is the treatment of choice for **femur shaft fractures** in adults, providing stable fixation and allowing early mobilization. - It involves inserting a **metal rod** into the medullary canal of the bone across the fracture site, with screws locking it in place at both ends. *Hip Spica* - A **hip spica cast** is typically used for **femur fractures in young children** (under 6 years old) as non-operative management. - It is **not suitable for adults** due to weight, discomfort, and the inability to maintain adequate reduction and stability for an adult-sized femur. *Above knee Cast* - An **above-knee cast** is generally insufficient for **femur shaft fractures** as it does not provide adequate immobilization of the hip joint. - It is more commonly used for **tibial fractures** or injuries to the knee/lower leg, not for a fracture as high as the proximal femoral shaft. *Above knee Slab* - An **above-knee slab** offers even less stability than a full cast and is usually a temporary measure for initial immobilization before definitive treatment or for less severe injuries. - It would be **inadequate to stabilize a femoral shaft fracture** and prevent displacement.

Question 1015: A patient with a shoulder dislocation is at risk of damage to which nerve?

A. Radial nerve
B. Musculocutaneous nerve
C. Median nerve
D. Axillary nerve (Correct Answer)

Explanation: ***Axillary nerve*** - The **axillary nerve** (C5, C6) is particularly vulnerable to injury during **shoulder dislocation** due to its close anatomical proximity to the surgical neck of the humerus. - Damage can result in weakness of the **deltoid muscle** (leading to impaired abduction) and loss of sensation over the lateral shoulder. *Radial nerve* - The **radial nerve** (C5-T1) primarily supplies extensors of the arm and forearm and is more commonly injured in **mid-shaft humeral fractures** or compression in the axilla. - While shoulder dislocation can cause traction injuries, direct radial nerve damage is less typical compared to the axillary nerve. *Musculocutaneous nerve* - The **musculocutaneous nerve** (C5-C7) innervates the biceps and brachialis muscles, responsible for forearm flexion, and provides sensation to the lateral forearm. - It is typically well-protected and rarely injured in an isolated shoulder dislocation; injuries are more common with direct trauma to the anterior arm or humerus. *Median nerve* - The **median nerve** (C5-T1) is responsible for many wrist and finger flexors and sensation in the thumb, index, middle, and radial half of the ring finger. - Injury to the median nerve is uncommon in shoulder dislocations unless there is significant brachial plexus trauma or a severe, complex fracture involving the anterior aspect of the shoulder joint.

Question 1016: A 70-year-old physiologically fit male presents with severe hip pain after a fall. X-ray reveals a displaced femoral neck fracture. What is the most appropriate management option?

A. Hemiarthroplasty (Correct Answer)
B. Total hip replacement
C. Conservative management with physical therapy
D. Corticosteroid injection

Explanation: ***Hemiarthroplasty*** - For an **elderly patient** (70-year-old) with a **femoral neck fracture** and good physiological status, hemiarthroplasty is often the preferred choice. - It involves replacing the **femoral head and neck** with a prosthesis, allowing for early mobilization and reducing the risk of avascular necrosis. *Conservative management with physical therapy* - This approach is generally **not suitable for displaced femoral neck fractures** in the elderly due to high risks of **non-union** and **avascular necrosis**. - Prolonged bed rest associated with conservative management can lead to complications such as **pneumonia**, **deep vein thrombosis**, and **pressure ulcers** in elderly patients. *Total hip replacement* - While an option for femoral neck fractures, **total hip replacement** is typically reserved for **younger patients**, those with **pre-existing arthritis**, or those with **better bone quality**. - It involves replacing both the **femoral head and the acetabular cup**, a more complex procedure than hemiarthroplasty. *Corticosteroid injection* - **Corticosteroid injections** are used for **inflammatory joint conditions** and pain relief, **not for fracture management**. - They have **no role in stabilizing a fractured femoral neck** and would not address the mechanical instability or bone healing required.

Question 1017: A patient with a comminuted femoral shaft fracture undergoes intramedullary nailing. What is the primary advantage of this technique?

A. Increased risk of infection
B. Decreased need for antibiotics
C. Facilitated fracture healing
D. Improved postoperative mobilization (Correct Answer)

Explanation: ***Improved postoperative mobilization*** - **Intramedullary nailing** provides **stable internal fixation**, allowing for earlier weight-bearing and mobilization. - This stability helps prevent complications such as **muscle atrophy** and **joint stiffness** that can result from prolonged immobilization. *Increased risk of infection* - While all surgical procedures carry some risk of infection, **intramedullary nailing** is generally associated with a **lower infection rate** compared to external fixation methods due to its enclosed nature. - The procedure itself is performed under **sterile conditions**, and prophylactic antibiotics are often administered to minimize this risk. *Facilitated fracture healing* - While intramedullary nailing does facilitate healing by providing stability and promoting **secondary bone healing** through callus formation, it is not its *primary* advantage over other fixation methods. - The primary benefit often lies in the enablement of **early functional recovery** and mobility. *Decreased need for antibiotics* - The use of **prophylactic antibiotics** is standard practice in almost all orthopedic surgeries, including intramedullary nailing, to prevent infection. - The need for antibiotics is not decreased; rather, it is a crucial component of **postoperative care** to mitigate infectious risks.

Question 1018: A 45-year-old male presents with wrist drop following a mid-shaft humerus fracture. Based on the nerve injury, analyze and determine the most appropriate next step in management.

A. Immediate surgical exploration
B. Observation and physiotherapy (Correct Answer)
C. Steroid injection
D. Electromyography after 3 weeks

Explanation: ***Observation and physiotherapy*** - A **wrist drop** following a **mid-shaft humerus fracture** is highly suggestive of **radial nerve palsy**. - **Radial nerve palsy** in this context is often a **neurapraxia** or **axonotmesis** caused by contusion or stretching, and typically resolves spontaneously within 3 to 6 months with conservative management including observation and physiotherapy to maintain range of motion and prevent contractures. *Immediate surgical exploration* - **Immediate surgical exploration** is usually reserved for **open fractures**, significant soft tissue injury, or when there is **no sign of recovery after 3-6 months** or progressive neurological deficit. - In most closed fractures, the radial nerve is only temporarily injured and recovers without surgery. *Electromyography after 3 weeks* - **Electromyography (EMG)** and **nerve conduction studies (NCS)** are primarily effective at detecting denervation changes or nerve regeneration after a period sufficient for these changes to develop, typically **3 to 4 weeks post-injury at the earliest**. - While it can confirm nerve injury and assess prognosis, it is not the *immediate next step* in management given the high likelihood of spontaneous recovery with observation. *Steroid injection* - **Steroid injections** are generally used for localized inflammatory conditions like tendonitis or carpal tunnel syndrome. - They have **no role in the management of acute nerve palsy** following a fracture.

Question 1019: A 42-year-old female presents with pain and swelling in the right wrist after a fall. An X-ray shows a fracture in the carpal bones. Which bone is most commonly fractured in such injuries?

A. Scaphoid (Correct Answer)
B. Lunate
C. Triquetrum
D. Pisiform

Explanation: ***Scaphoid*** - The **scaphoid bone** is the most commonly fractured carpal bone, often due to a **fall on an outstretched hand (FOOSH)**, which transmits force directly to it. - Its **poor blood supply** makes it prone to **avascular necrosis** and delayed healing if not properly managed. *Lunate* - While the lunate can be injured, particularly in **Kienbock's disease** (avascular necrosis), it is less commonly fractured than the scaphoid in trauma. - Fractures of the lunate often result from high-energy trauma and are less frequent than scaphoid fractures. *Triquetrum* - The **triquetrum** is the **second most commonly fractured carpal bone**, usually due to impaction against the ulna or from avulsion injuries. - However, its fracture rate is still significantly lower than that of the scaphoid. *Pisiform* - Fractures of the **pisiform** are rare and typically result from **direct trauma** to the hypothenar eminence or avulsion injuries. - It is located anterior to the triquetrum and functions primarily as a sesamoid bone for the flexor carpi ulnaris tendon.

Question 1020: A 55-year-old female with osteoporosis sustains a Colles fracture. What is the most important factor to assess before surgical intervention?

A. Bone density
B. Vitamin D levels
C. Functional status of the hand
D. Fracture alignment (Correct Answer)

Explanation: ***Fracture alignment*** - Maintaining **proper anatomical alignment** is critical for restoring normal function of the wrist and preventing long-term complications such as malunion or nonunion. - While patient age and activity level can influence the acceptable degree of displacement, a **significant displacement** typically necessitates surgical intervention to achieve optimal alignment. *Bone density* - While relevant for understanding the patient's underlying osteoporosis, bone density itself does not determine the immediate need for surgical intervention for an acute fracture. - **Osteoporosis management** is crucial for long-term health, but the immediate surgical decision for a Colles fracture focuses on the fracture morphology. *Vitamin D levels* - **Vitamin D levels** are important for bone health and healing in general, especially in osteoporotic patients, but they are not the primary determinant for the necessity or timing of surgical intervention for a Colles fracture. - Addressing low Vitamin D is part of overall **osteoporosis management**, not the immediate surgical decision-making for fracture reduction. *Functional status of the hand* - The **functional status** of the hand is the ultimate outcome goal of any treatment, but *before* surgery, the acute injury itself will severely limit function, making it an unreliable immediate assessment point for surgical indication. - While relevant for establishing baselines and post-operative goals, pre-operative functional status of the injured hand often reflects the trauma rather than dictating the need for surgical alignment.

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Principles of Fracture Management

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Upper Limb Fractures

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Lower Limb Fractures

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Spinal Trauma

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Pelvic and Acetabular Fractures

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Open Fractures

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Fractures in Children

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Fracture Complications

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Nonunion and Malunion

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Polytrauma Management

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Joint Dislocations

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Soft Tissue Injuries

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Trauma — MCQs

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