Trauma Practice Questions

Q: What is the most common complication of lateral condyle humerus fracture?

Nonunion. ***Nonunion*** - The lateral condyle is an **epiphyseal apophysis**, meaning it's a secondary ossification center that doesn't contribute to longitudinal bone growth, and it is covered by **cartilage**, limiting the contact area between fracture fragments. - Due to the cartilage covering, the periosteal blood supply is compromised leading to difficulty in healing, making **nonunion the most common complication**. *Malunion* - While **malunion** can occur, it is less common than nonunion in lateral condyle fractures due to the specific anatomy and blood supply of the lateral condyle. - **Growth disturbances** or **cubitus valgus** can result from malunion, but nonunion remains the primary concern. *Vascular injury and compromise (VIC)* - **Vascular injuries** are rare due to the relatively intact soft tissue envelope around the fracture site. - The main vessels are not typically in close proximity to the fracture line of the lateral condyle. *Median nerve injury* - The **median nerve** courses anterior to the elbow joint, more medially. - It is rarely affected by lateral condyle fractures, which are on the lateral aspect of the distal humerus.

Q: Which of the following statements is true regarding supracondylar fractures of the humerus?

Extension type most common. **Extension type most common** - **Extension-type supracondylar fractures** account for the vast majority (about 95%) of all supracondylar humerus fractures. - This type typically results from a fall on an **outstretched hand** with the elbow in extension, forcing the distal fragment posteriorly. *More common in adults* - **Supracondylar fractures of the humerus** are predominantly observed in children, especially between 5 and 10 years of age. - They are the **most common elbow fracture in children**, making this statement incorrect. *Flexion type is less common than extension type* - While flexion-type fractures do occur, they are significantly less common, representing only about 5% of all supracondylar fractures. - This type typically results from a direct blow to the posterior aspect of the elbow, with the distal fragment displaced anteriorly. *Both types are equally common* - As established, extension-type fractures are far more prevalent than flexion-type fractures, making them not equally common. - The significant disparity in incidence confirms that this statement is incorrect.

Q: Proximal humerus fracture which has maximum chances of avascular necrosis

Four part. ***Four part fracture*** - A **four-part proximal humerus fracture** typically involves displacement of the humeral head, greater tuberosity, lesser tuberosity, and humeral shaft. - This extensive displacement significantly disrupts the **blood supply** to the humeral head, specifically the **arcuate artery** and its branches, leading to a high risk of **avascular necrosis**. *One part fracture* - A **one-part fracture** indicates that the fracture fragments are minimally displaced (<1 cm or <45° angulation). - The **blood supply** to the humeral head remains largely intact, resulting in a very low risk of avascular necrosis. *Two part fracture* - A **two-part fracture** involves displacement of one major fragment (e.g., surgical neck or tuberosity) from the humeral head. - While there is some disruption, the overall risk of **avascular necrosis** is lower compared to more complex fractures. *Three part fracture* - A **three-part fracture** involves separate displacement of the humeral head and two tuberosities. - This fracture pattern causes more significant disruption to the **vascularity** of the humeral head than two-part fractures but generally less than four-part fractures.

Q: What is the primary reason for early stabilization of a femur shaft fracture?

To prevent fat embolism syndrome and systemic complications. ***To prevent fat embolism syndrome and systemic complications*** - Early stabilization of femur shaft fractures significantly **reduces the incidence of fat embolism syndrome (FES)**. Fat emboli released from the bone marrow can travel to the lungs and brain, causing severe respiratory distress and neurological deficits. - By stabilizing the fracture, the **release of fat globules is minimized**, thereby preventing FES and associated systemic complications such as acute respiratory distress syndrome (ARDS) and adult respiratory distress syndrome (ADRS). *To prevent significant blood loss.* - While femur fractures can cause significant blood loss, the primary reason for early stabilization is not solely to prevent it but to reduce complications. **Blood loss is a direct consequence**, but FES poses a greater immediate threat to life. - Furthermore, **blood loss can often be managed initially by other means**, such as fluid resuscitation and direct pressure, while FES requires prompt reduction of fracture movement. *To reduce pain and discomfort.* - Reducing pain and discomfort is an important benefit of stabilization, but it is **not the primary life-saving reason** for early intervention. Analgesics and proper splinting can also address pain. - The focus on early stabilization goes beyond symptomatic relief to actively prevent **potentially fatal systemic complications**. *To facilitate quicker healing.* - While stability is crucial for proper healing, **early stabilization primarily addresses acute, life-threatening complications** rather than long-term healing rates. Optimal healing depends on many factors, including blood supply and infection control, not solely on initial stabilization. - **Quicker healing is a secondary benefit**; the immediate priority is to prevent acute morbidity and mortality associated with the fracture.

Q: Tardy ulnar nerve palsy is specifically associated with which type of fracture?

Lateral condyle fracture of the humerus. ***Lateral condyle fracture of the humerus*** - This fracture, especially in children, can lead to **cubitus valgus deformity** as a long-term complication if it heals incorrectly. - The resulting **valgus angulation** at the elbow abnormally stretches the ulnar nerve behind the medial epicondyle, causing **tardy ulnar nerve palsy** years after the initial injury. *Medial condyle fracture of the humerus* - While close to the ulnar nerve, medial condyle fractures are more likely to cause **immediate nerve damage** due to direct impingement, rather than delayed or "tardy" palsy from chronic stretching. - Complications typically involve varus deformity, which does not commonly stretch the ulnar nerve in the same manner as valgus. *Fracture of the humeral shaft* - This type of fracture is more commonly associated with **radial nerve injury** (e.g., wrist drop), especially in fractures of the mid-shaft. - It does not typically lead to long-term deformities at the elbow that would cause **delayed ulnar nerve compression**. *Fracture of the radial shaft* - Radial shaft fractures (e.g., Monteggia, Galeazzi) primarily affect the **radial nerve** or the **posterior interosseous nerve**. - They do not directly involve the elbow joint in a manner that would cause **tardy ulnar nerve palsy**.

Q: Heterotopic ossification is primarily associated with which of the following?

Soft tissues. ***Soft tissues*** - **Heterotopic ossification** is the pathological formation of mature, lamellar bone in **non-osseous (soft tissues)** where bone does not normally exist. - This process often occurs in muscles, tendons, ligaments, or fascia, particularly after trauma or neurological injury. *Bone* - Heterotopic ossification is the formation of bone *outside* of normal skeletal structures, not within existing bone. - While it involves bone formation, its defining characteristic is its location in **extraskeletal sites**, not within the bone itself. *Joint* - Although heterotopic ossification can occur around joints, leading to **joint stiffness** and limited range of motion, it is the formation of bone within the **soft tissues surrounding the joint**, not within the joint capsule or articular cartilage itself. - The primary location is the adjacent soft tissue, which then secondarily impacts joint mobility. *None of the options* - This option is incorrect because "Soft tissues" accurately describes the primary location where heterotopic ossification occurs. - The condition is specifically defined by bone formation in these non-skeletal sites.

Q: A 33-year-old male presents with complaints of pain in the left hip. On examination, there is flexion and external rotation of the left lower limb, with a 7 cm shortening of the left lower limb. A gluteal mass is palpable, which moves with the movement of the femoral shaft. What is the most probable diagnosis?

Pipkin's type 4 fracture. ***Pipkin's type 4 fracture*** - This fracture involves a **femoral head fracture** combined with a **hip dislocation**. The described findings of flexion, external rotation, shortening, and a palpable gluteal mass, which moves with the femoral shaft, are classic signs of a **femoral head fracture-dislocation**, often categorized as a Pipkin type. - The gluteal mass moving with the femoral shaft indicates that the **femoral head** is displaced and can be palpated, which is consistent with a **femoral head fracture** that has dislocated. *Anterior dislocation of hip* - An **anterior hip dislocation** typically presents with the limb in **flexion, abduction, and external rotation**, but it usually involves lengthening rather than shortening due to the head being displaced anteriorly. - There would typically not be a palpable gluteal mass, and the degree of shortening described (7 cm) is more consistent with a complex injury like a fracture-dislocation. *Central fracture dislocation* - A **central fracture dislocation** involves the femoral head pushing through the **acetabulum into the pelvis**. This usually presents with a **shortened and internally rotated limb**, and pain, but not typically a palpable gluteal mass or the specific flexion and external rotation described. - While there is shortening, the mechanism of injury and the palpable mass are not consistent with the femoral head being displaced into the pelvic cavity. *Posterior dislocation* - A **posterior hip dislocation** presents with the limb in **flexion, adduction, and internal rotation**, often with significant shortening. - Although it causes shortening, the patient presents with **external rotation**, not internal rotation, differentiating it from a posterior dislocation. The palpable gluteal mass is also not a typical finding in a pure posterior dislocation without an associated fracture.

Q: In which of the following conditions is the Kocher-Langenbeck approach for emergency acetabular fixation contraindicated?

Morel - Lavallee lesion. ***Morel - Lavallee lesion*** - A Morel-Lavallee lesion is a **closed degloving injury** where the skin and subcutaneous tissue are avulsed from the underlying fascia, creating a potential space that fills with hematoma, fat, and lymphatic fluid. - The **Kocher-Langenbeck approach** involves significant soft tissue dissection, which increases the risk of **wound complications**, infection, and flap necrosis in an already compromised and devascularized soft tissue envelope found in a Morel-Lavallee lesion. *Open fracture* - An **open fracture** involves a break in the skin, exposing the fracture site, which significantly increases the risk of infection. - While it presents a challenge, an open fracture is generally a **stronger indication for urgent surgical stabilization** to prevent further contamination and promote healing, rather than a contraindication to a specific surgical approach if it's the most appropriate for the fracture pattern. *Progressive sciatic nerve injury* - **Progressive neurologic deficits**, including sciatic nerve injury, often necessitate urgent surgical intervention to decompress the nerve and prevent irreversible damage. - This symptom emphasizes the **urgency of surgical stabilization** and internal fixation for the acetabular fracture, making it an indication for rather than a contraindication to the Kocher-Langenbeck approach if it provides optimal access. *Recurrent dislocation despite closed reduction and traction* - **Instability** of the hip joint despite conservative measures indicates a need for surgical intervention to achieve stable reduction and fixation of the acetabular fracture. - This situation generally **supports the need for open reduction and internal fixation**, often via approaches like Kocher-Langenbeck, to restore joint congruity and stability, making it an indication, not a contraindication.

Q: Which part of the mandible is most commonly fractured?

Angle of mandible. ***Angle of mandible*** - The **angle of the mandible** is a common site for fractures due to its anatomical position and the forces it experiences during trauma. - This area is relatively weaker than other parts and is often impacted during direct blows to the jaw. *Body of mandible* - While fractures of the **mandibular body** can occur (often in the canine region), they are less frequent than those at the angle. - The body of the mandible is generally a robust structure, making fractures here typically result from higher-impact trauma. *Condylar process of mandible* - Fractures of the **condylar process** are very common, especially in children, and are often associated with indirect trauma. - However, the angle region still holds the highest frequency of fractures due to direct impact and leverage forces. *Coronoid process of mandible* - Fractures of the **coronoid process** are relatively rare and usually occur as part of a more extensive mandibular fracture or due to direct trauma to the temporal region. - Its protected position beneath the zygomatic arch makes it less susceptible to isolated injury.

Question 1

What is the most common complication of lateral condyle humerus fracture?

Accepted Answer

Nonunion

Answer

Malunion

Answer

Vascular injury and compromise (VIC)

Answer

Median nerve injury

Question 2

Which of the following statements is true regarding supracondylar fractures of the humerus?

Accepted Answer

Extension type most common

Answer

Flexion type is less common than extension type

Answer

Both types are equally common

Answer

More common in adults

Question 3

Proximal humerus fracture which has maximum chances of avascular necrosis

Accepted Answer

Four part

Answer

One part

Answer

Two part

Answer

Three part

Question 4

What is the primary reason for early stabilization of a femur shaft fracture?

Accepted Answer

To prevent fat embolism syndrome and systemic complications

Answer

To prevent significant blood loss.

Answer

To reduce pain and discomfort.

Answer

To facilitate quicker healing.

Question 5

Tardy ulnar nerve palsy is specifically associated with which type of fracture?

Accepted Answer

Lateral condyle fracture of the humerus

Answer

Medial condyle fracture of the humerus

Answer

Fracture of the humeral shaft

Answer

Fracture of the radial shaft

Question 6

Heterotopic ossification is primarily associated with which of the following?

Accepted Answer

Soft tissues

Answer

Bone

Answer

Joint

Answer

None of the options

Question 7

Which of the following best describes a Monteggia fracture?

Accepted Answer

Fracture of the proximal third of the ulna with dislocation of the radial head.

Answer

Fracture of distal radius with dislocation of the distal ulna

Answer

Fracture of distal third of ulna with dislocation of the radial head.

Answer

Fracture of proximal one third of radius with dislocation of the distal ulna.

Question 8

A 33-year-old male presents with complaints of pain in the left hip. On examination, there is flexion and external rotation of the left lower limb, with a 7 cm shortening of the left lower limb. A gluteal mass is palpable, which moves with the movement of the femoral shaft. What is the most probable diagnosis?

Accepted Answer

Pipkin's type 4 fracture

Answer

Anterior dislocation of hip

Answer

Central fracture dislocation

Answer

Posterior dislocation

Question 9

In which of the following conditions is the Kocher-Langenbeck approach for emergency acetabular fixation contraindicated?

Accepted Answer

Morel - Lavallee lesion

Answer

Progressive sciatic nerve injury

Answer

Open fracture

Answer

Recurrent dislocation despite closed reduction and traction

Question 10

Which part of the mandible is most commonly fractured?

Accepted Answer

Angle of mandible

Answer

Body of mandible

Answer

Coronoid process of mandible

Answer

Condylar process of mandible

Trauma — MCQs

Trauma — MCQs

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