Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 1051: What is the term used to describe an inferior dislocation of the shoulder joint?

A. Anterior Dislocation of the shoulder joint
B. Posterior Dislocation of the shoulder joint
C. Superior Dislocation of the shoulder joint
D. Luxatio erecta (Correct Answer)

Explanation: **Luxatio erecta** - **Luxatio erecta** is a rare but distinct type of shoulder dislocation characterized by the arm being fixed in an **abducted** and **externally rotated** position (arm pointing upwards). - This specific posture indicates an **inferior dislocation** where the humeral head is displaced below the glenoid fossa. *Anterior Dislocation of the shoulder joint* - An **anterior dislocation** is the most common type, where the humeral head moves forward and medially in relation to the glenoid. - The arm is typically held in slight **abduction** and **external rotation**, not fixed in an erect position. *Posterior Dislocation of the shoulder joint* - A **posterior dislocation** is rare and often results from seizures or electrocution, where the humeral head displaces posteriorly. - The arm is typically held in **adduction** and **internal rotation**, which is distinct from an inferior dislocation. *Superior Dislocation of the shoulder joint* - **Superior dislocations** of the shoulder are extremely rare and usually involve significant trauma, often with associated fractures of the acromion or clavicle. - The humeral head displaces upwards, typically causing the arm to be held in an adducted position, not the characteristic "arms up" posture of luxatio erecta.

Question 1052: The anterior humeral line and radiocapitellar alignment are most commonly disturbed in -

A. Supracondylar Fracture of the humerus (Correct Answer)
B. Monteggia Fracture dislocation
C. Fracture of Proximal Radius
D. Fracture lateral condyle of the humerus

Explanation: ***Supracondylar Fracture of the humerus*** - **Anterior humeral line** passes through the **anterior cortex of the humerus** and should intersect the middle third of the capitellum in a normal elbow. - In supracondylar fractures, particularly those with **posterior displacement**, this line is often displaced **anteriorly or posteriorly**, failing to intersect the capitellum correctly. Additionally, the **radiocapitellar alignment** refers to the relationship between the **radius head** and the **capitellum**. Fractures and displacements around the elbow joint, such as supracondylar fractures, can disrupt this alignment. *Fracture lateral condyle of the humerus* - While a fracture of the lateral condyle can affect the elbow joint, it primarily involves a part of the **articular surface** and not necessarily the overall alignment of the entire distal humerus relative to the capitellum in the same way a supracondylar fracture does. - The **lateral condyle** is a smaller segment, and its fracture may not significantly alter the anterior humeral line **unless there is significant displacement** that indirectly affects the alignment of the capitellum. *Monteggia Fracture dislocation* - A **Monteggia fracture** involves a fracture of the **ulna** with dislocation of the **radial head** at the elbow. - While radiocapitellar alignment is severely disrupted, the **anterior humeral line** itself, which assesses the distal humerus, is typically **unaffected** as the primary injury is in the forearm bones and the radial head. *Fracture of Proximal Radius* - A fracture of the proximal radius (e.g., **radial head or neck fracture**) primarily affects the **radial articular surface** and its alignment with the capitellum. - While **radiocapitellar alignment** would clearly be disturbed, the position of the **distal humerus** relative to the capitellum, which the anterior humeral line evaluates, usually remains intact.

Question 1053: In which condition is the Hamilton Ruler test sign positive?

A. Anterior dislocation of shoulder (Correct Answer)
B. Posterior dislocation of shoulder
C. Luxatio erecta
D. Acromioclavicular joint dislocation

Explanation: ***Anterior dislocation of shoulder*** - The **Hamilton Ruler test** is positive when a straight edge, like a ruler, can be laid across the **lateral aspect of the deltoid prominence** from the acromion to the lateral epicondyle. - This is indicative of the **loss of the normal rounded contour of the shoulder**, which occurs due to the humeral head dislocating anteriorly. *Acromioclavicular joint dislocation* - This condition presents with a **"step-off" deformity** at the AC joint and pain directly over the joint, but the overall contour of the shoulder glenohumeral joint is preserved. - The deltoid prominence remains intact, making the Hamilton Ruler test negative. *Posterior dislocation of shoulder* - In posterior dislocation, the **humeral head moves posteriorly**, and the anterior contour of the shoulder might appear flattened, but the characteristic prominent anterior bulge seen in anterior dislocation is absent. - The Hamilton Ruler test specifically assesses for the loss of the lateral deltoid prominence, which is more typical of anterior displacement. *Luxatio erecta* - **Luxatio erecta** is an inferior dislocation of the shoulder where the arm is fixed in an **abducted and externally rotated position**, making it appear "erect". - While a severe type of shoulder dislocation, the specific anatomical changes that lead to a positive Hamilton Ruler test (loss of lateral deltoid prominence with the humeral head moving anteriorly and medially) are not typically present in this configuration.

Question 1054: Which of the following statements is true regarding a Monteggia fracture?

A. Upper ulnar fracture with dislocated radial head. (Correct Answer)
B. Upper radial fracture with dislocated ulna.
C. Lower radial fracture with dislocated ulna.
D. Lower ulnar fracture with dislocated radius.

Explanation: ***Upper ulnar fracture with dislocated radial head.*** - A Monteggia fracture is classically defined as a fracture of the **proximal or middle third of the ulna** accompanied by an **anterior dislocation of the radial head**. - This injury pattern disrupts the alignment of the **forearm bones** and the **elbow joint**, requiring careful reduction and stabilization. *Upper radial fracture with dislocated ulna.* - This statement incorrectly identifies the fractured bone as the radius and the dislocated bone as the ulna. - The defining characteristic of a Monteggia fracture is the **ulnar fracture** and **radial head dislocation**. *Lower radial fracture with dislocated ulna.* - This describes a different type of injury, such as a **Galeazzi fracture**, which involves a **radial shaft fracture** with dislocation of the **distal radioulnar joint**. - It does not fit the criteria for a Monteggia fracture pattern. *Lower ulnar fracture with dislocated radius.* - This description is not consistent with a Monteggia fracture, which specifically involves the **proximal ulna** and **radial head dislocation**. - A lower ulnar fracture with distal radius dislocation is a distinct injury pattern.

Question 1055: Which type of femur fracture has the HIGHEST risk of Avascular Necrosis (AVN)?

A. Subcapital fracture (Correct Answer)
B. Intertrochanteric fracture
C. Transcervical fracture
D. None of the options

Explanation: ***Subcapital fracture*** - This fracture type occurs at the **neck of the femur**, very close to the femoral head's blood supply. - Due to the **intracapsular location**, it severely compromises the **medial and lateral circumflex femoral arteries**, leading to a high risk of **avascular necrosis (AVN)**. *Intertrochanteric fracture* - This fracture is **extracapsular**, occurring below the femoral neck between the greater and lesser trochanters. - While significant, its location generally leaves the **blood supply to the femoral head intact**, thus having a much lower risk of AVN compared to intracapsular fractures. *Transcervical fracture* - This is an **intracapsular fracture** of the femoral neck, but it is located more centrally within the neck. - While it does carry a significant risk of AVN due to disruption of blood supply, the subcapital fracture, being more proximate to the head, typically has an even higher risk due to a greater degree of compromise to the main blood vessels. *None of the options* - This option is incorrect because **subcapital fractures** are well-documented for having the highest risk of avascular necrosis among femur fractures due to their specific anatomical location and impact on blood supply.

Question 1056: The K nail can be used for all of the following types of fractures except -

A. Isthmic femur shaft fractures
B. Intertrochanteric fractures (Correct Answer)
C. Low subtrochanteric fractures
D. Distal femur shaft fractures

Explanation: ***Intertrochanteric fractures*** - The K nail (specifically, the Kuntscher nail) is a **straight intramedullary nail** primarily designed for diaphyseal fractures. - It is **not suitable for intertrochanteric fractures** as these are metaphyseal and involve the proximal femur, requiring implants that offer greater stability in this region, such as cephalomedullary nails or plates. *Isthmic femur shaft fractures* - The **Kuntscher nail** was originally developed for and is well-suited for **isthmic femur shaft fractures** due to the narrow canal providing good cortical fixation. - Its design as a straight, broad nail fits snugly in the isthmus, providing excellent stability. *Low subtrochanteric fractures* - While more challenging, **K nails can be used for low subtrochanteric fractures**, especially if the fracture extends into the diaphyseal region. - However, newer implants like **cephalomedullary nails** are often preferred due to better biomechanical stability in this region. *Distal femur shaft fractures* - **K nails can be employed for distal femoral shaft fractures** if the fracture pattern allows for adequate fixation distal to the isthmus without compromising knee joint function. - The nail must be long enough to achieve stability, and the lack of proper locking mechanisms in traditional K nails may be a limiting factor compared to locked intramedullary nails.

Question 1057: Fracture neck of femur in 80-year-old male sustained 1 week ago. The treatment of choice is -

A. Hemiarthroplasty (Correct Answer)
B. Closed reduction and fixation with three cancellous screws
C. Longitudinal skin traction for 6 weeks
D. Excision arthroplasty

Explanation: ***Hemiarthroplasty*** - For an 80-year-old with a **fracture of the femoral neck**, especially if sustained a week ago, **hemiarthroplasty** is the preferred treatment to allow early mobilization and prevent complications of prolonged recumbency. - This procedure replaces the **femoral head** and neck, minimizing the risk of **avascular necrosis** and **non-union** which are common complications in older patients with displaced femoral neck fractures. *Excision arthroplasty* - **Excision arthroplasty**, also known as **Girdlestone arthroplasty**, is a salvage procedure typically reserved for cases of severe infection, failed prosthetic implants, or when other options are not viable. - It involves removing the femoral head, creating a **pseudarthrosis**, and results in a shortened, unstable limb, making it unsuitable as a primary treatment. *Closed reduction and fixation with three cancellous screws* - This option is generally considered for **younger patients** with undisplaced or minimally displaced **femoral neck fractures** due to better bone quality and lower risk of avascular necrosis. - In an 80-year-old, the risks of **non-union** and **avascular necrosis** are significantly higher, and the prolonged weight-bearing restrictions associated with this method are detrimental. *Longitudinal skin traction for 6 weeks* - Prolonged **skin traction** is rarely used for femoral neck fractures, especially in the elderly, due to the high risk of complications such as **skin breakdown**, **deep vein thrombosis**, **pneumonia**, and **muscle atrophy**. - It does not provide definitive fixation and is not a definitive treatment for a bony fracture.

Question 1058: Which of the following fractures of the neck of femur are associated with maximal compromise in blood supply ?

A. Basicervical fracture
B. Trans cervical fracture
C. Sub Capital fractures (Correct Answer)
D. Intertrochanteric fractures

Explanation: ***Sub Capital fractures*** - These fractures occur at the anatomical **neck of the femur**, very close to the femoral head. - Due to their location, they disrupt the main blood supply to the femoral head, primarily from the **retinacular arteries**, leading to a high risk of **avascular necrosis**. *Trans cervical fracture* - This fracture occurs through the **midneck of the femur**, which is still within the intracapsular region. - While it has a significant risk of **ischemia**, the compromise is generally less severe than in subcapital fractures. *Intertrochanteric fractures* - These are **extracapsular fractures** occurring between the greater and lesser trochanters. - They tend to have an **excellent blood supply** and thus a low risk of avascular necrosis, but are associated with more significant blood loss and malunion issues. *Basicervical fracture* - This is an **intracapsular fracture** that occurs at the base of the femoral neck, near the junction with the trochanters. - Although intracapsular, its position is slightly more proximal than subcapital fractures, potentially leaving more of the **retinacular vessels** intact, resulting in a somewhat lower risk of avascular necrosis compared to subcapital fractures.

Question 1059: Which of the following fractures is least likely associated with vascular injury?

A. Fracture supracondylar femur
B. Fracture supracondylar humerus
C. Fracture shaft of femur
D. Fracture shaft of humerus (Correct Answer)

Explanation: ***Fracture shaft of humerus*** - While any fracture can theoretically cause vascular injury, **mid-shaft humeral fractures** are less commonly associated with significant **vascular compromise** compared to those around major joints or near critical neurovascular bundles. - The **brachial artery** and its branches are often sufficiently mobile and protected by surrounding musculature in the mid-shaft region, reducing the incidence of direct laceration or entrapment. *Fracture supracondylar femur* - **Supracondylar femur fractures** are in close proximity to the **femoral artery** and its branches in the popliteal fossa. - Displacement of these fractures can easily **lacerate or compress** these vital vessels, leading to high rates of vascular injury. *Fracture supracondylar humerus* - **Supracondylar humerus fractures** in children are notoriously associated with **brachial artery injury** due to the artery's close proximity and fixated position over the joint. - The acute angulation and displacement often seen in these fractures put the artery at significant risk of **kinking, compression, or transection**. *Fracture shaft of femur* - **Femoral shaft fractures** can be associated with significant vascular injury, particularly from **large displaced fragments** or high-energy trauma. - The **superficial femoral artery** and its perforating branches can be torn, leading to substantial hemorrhage or arterial compromise.

Question 1060: Most common site of myositis ossificans ?

A. Shoulder
B. Wrist
C. Quadriceps/Thigh (Correct Answer)
D. Elbow

Explanation: ***Quadriceps/Thigh*** - The **quadriceps and thigh** muscles are frequently affected due to their common involvement in sports injuries and trauma. - This region is prone to **hematoma formation** after contusions, which can predispose to ectopic bone formation. *Shoulder* - While the shoulder can be affected by myositis ossificans, it is **less common** than the quadriceps. - Traumatic myositis ossificans in the shoulder typically involves the **deltoid muscle**. *Wrist* - Myositis ossificans of the **wrist is rare** and usually occurs after severe trauma or crush injuries. - The small muscle mass and limited direct trauma to the wrist muscles make it an **unlikely primary site**. *Elbow* - Myositis ossificans can occur around the elbow, particularly in the **brachialis muscle**, often following dislocations or fractures. - However, the elbow is still **less commonly affected overall** compared to the large muscle groups of the thigh.

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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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