Trauma Practice Questions

Q: A clinician is assessing a patient for damage to the axillary nerve following a shoulder dislocation. Which clinical test should be performed to evaluate the integrity of this nerve?

Shoulder abduction test. ***Shoulder abduction test*** - The **axillary nerve** innervates the **deltoid muscle**, which is the primary muscle responsible for **shoulder abduction**. - Testing the patient's ability to abduct their shoulder against resistance directly assesses the motor function of the axillary nerve. *Elbow flexion test* - This test primarily evaluates the function of the **musculocutaneous nerve**, which innervates the **biceps brachii** and **brachialis muscles**. - It is not directly relevant to assessing the integrity of the axillary nerve. *Wrist extension test* - This test primarily assesses the function of the **radial nerve**, which innervates the extensors of the wrist and fingers. - Damage to the axillary nerve would not typically affect wrist extension. *Finger adduction test* - This test primarily evaluates the function of the **ulnar nerve**, which innervates the intrinsic muscles of the hand responsible for finger adduction. - This test is unrelated to the axillary nerve's distribution or function.

Q: Which clinical test is used to assess the integrity of the radial nerve following a mid-shaft humerus fracture?

Wrist drop test. ***Wrist drop test*** - The **radial nerve** innervates the muscles responsible for **wrist extension** and **finger extension**. - Damage to the radial nerve (e.g., from a mid-shaft humeral fracture) can result in an inability to extend the wrist and fingers, known as **wrist drop**. *Tinel's sign* - This test assesses for **nerve irritation or compression** by percussing over the nerve, often used for **carpal tunnel syndrome** or **cubital tunnel syndrome**. - It checks for tingling or pain, not functional integrity of the radial nerve. *Phalen's maneuver* - This test is used to diagnose **carpal tunnel syndrome**, which involves compression of the **median nerve**. - It involves holding the wrists in maximal flexion to provoke symptoms, unrelated to radial nerve integrity. *Froment's sign* - This test assesses the integrity of the **ulnar nerve**, specifically the **adductor pollicis muscle**. - It involves asking the patient to hold a piece of paper between their thumb and index finger.

Q: Which technique involves realigning bone fragments through external manipulation without surgical intervention?

Closed reduction. ***Closed reduction*** - This technique involves **realigning fractured bone fragments** through **external manipulation** of the limb, without the need for an incision or direct visualization of the bone. - It is typically performed under **anesthesia** to relax muscles and minimize pain, allowing the surgeon to maneuver the bone ends into proper alignment. *Open reduction* - This method requires a **surgical incision** to directly visualize the fractured bone fragments and reduce them by hand or with surgical instruments. - It is generally reserved for fractures that cannot be adequately reduced by closed methods, or for those requiring **internal fixation**. *External fixation* - This technique uses **pins or wires inserted into the bone** through the skin, which are then connected to an external frame to stabilize the fracture. - While it involves external apparatus, its primary purpose is **stabilization**, not the initial realignment of bone fragments through manipulation. *Internal fixation* - This involves the surgical implantation of **plates, screws, rods, or wires** directly onto or within the bone fragments to stabilize them after reduction. - It is a method of **stabilizing** the fracture after reduction, which can be achieved through either open or closed techniques, rather than a reduction technique itself.

Q: What is the most common complication of a posterior shoulder dislocation?

Reverse Hill-Sachs lesion. ***Reverse Hill-Sachs lesion*** - A **reverse Hill-Sachs lesion** (also known as a **McLaughlin lesion**) is an impaction fracture on the anterior aspect of the humeral head, occurring when the humeral head strikes the posterior glenoid rim during a posterior dislocation. - It is the most common bony complication of a posterior shoulder dislocation due to the direct impact of the humeral head against the glenoid. *Bankart lesion* - A **Bankart lesion** is an injury to the anterior inferior glenoid labrum, often with an associated bony fragment, and is characteristic of **anterior shoulder dislocations**. - It results from the humeral head being forced anteriorly, tearing the labrum and capsule from the anterior glenoid, which is not the mechanism in posterior dislocations. *Rotator cuff tear* - While rotator cuff tears can occur with any shoulder dislocation, they are more commonly associated with **anterior dislocations**, especially in older patients. - They are also often seen with chronic instability or significant trauma, but a specific lesion like a reverse Hill-Sachs is more pathognomonic for a posterior dislocation. *Fracture of the scapula* - A **scapular fracture** is relatively uncommon with isolated shoulder dislocations and typically requires a significant, direct high-energy trauma. - Such fractures are less directly caused by the dislocation mechanism itself, compared to the impaction injury that creates a reverse Hill-Sachs lesion.

Q: In a pelvic fracture, which nerve is most at risk of injury due to its location within the pelvis?

Sciatic nerve. ***Sciatic nerve*** - The **sciatic nerve** is formed by nerve roots from L4-S3 and exits the pelvis through the **greater sciatic foramen**, making it vulnerable to injury from pelvic fractures, especially those involving the **posterior pelvis** or **sacrum**. - Its large size and proximity to various pelvic structures increase the likelihood of compression or direct trauma during significant pelvic trauma. *Femoral nerve* - The **femoral nerve** originates from L2-L4 and courses through the **psoas major muscle** and then under the inguinal ligament, making it less directly exposed to typical sites of fracture in the deep pelvis. - While it can be injured in high-energy trauma, it is not typically the most vulnerable compared to the sciatic nerve in general pelvic fractures. *Obturator nerve* - The **obturator nerve** (L2-L4) passes through the **obturator canal** to supply the medial thigh muscles, which provides some protection from direct impact compared to nerves within the open pelvic cavity. - Injuries to the obturator nerve are usually associated with specific types of fractures involving the superior pubic rami or anterior pelvic region, rather than being the most commonly injured in all pelvic fractures. *Pudendal nerve* - The **pudendal nerve** (S2-S4) exits the pelvis through the greater sciatic foramen, hooks around the ischial spine, and re-enters through the lesser sciatic foramen to supply the perineum. - While it is located within the pelvis, its deep and somewhat protected course reduces its likelihood of direct trauma from typical pelvic fractures, compared to the more exposed sciatic nerve near major fracture lines.

Q: Most common complication of fracture of tibia

Delayed union. ***Delayed union*** - The **tibia** has a relatively **poor blood supply** compared to other long bones, especially in its distal third, making it prone to delayed healing. - Delayed union is defined as a fracture that takes **longer than expected** to heal, but still has the potential to unite. *Infection* - While possible, especially with **open fractures**, infection is not the most common complication of all tibia fractures. - Infections can lead to **osteomyelitis**, but this specific complication is less frequent than delayed union. *Compartment syndrome* - This is a **serious complication** resulting from increased pressure within a closed fascial compartment, often of the lower leg. - While it is a significant risk with tibia fractures and requires immediate attention, it is **not the most common** complication overall. *Vascular injury* - Significant **vascular injury** is a rare but severe complication, particularly with high-energy trauma or displaced fractures. - Such injuries can lead to limb ischemia and require urgent surgical intervention, but occur **less frequently** than delayed union.

Q: The most common complication of intracapsular fracture neck of femur is

Non-Union. ***Non-Union*** - **Intracapsular fractures** of the femoral neck often disrupt the blood supply to the femoral head, increasing the risk of **avascular necrosis** and impaired healing. - Due to the limited blood supply and mechanical forces, the bone fragments may fail to unite, leading to **non-union**. *Mal union* - **Malunion** implies that the fracture has healed but in an anatomically incorrect or deformed position. - While it can occur, **non-union** is a more prevalent and severe complication in intracapsular femoral neck fractures due to the specific anatomical challenges. *Osteoarthritis* - **Osteoarthritis** can develop as a long-term complication if the fracture heals with altered joint mechanics or secondary to avascular necrosis. - However, it is a delayed consequence, whereas **non-union** is an early and direct failure of the healing process. *Shortening* - **Shortening** of the limb can occur due to fracture displacement or subsequent collapse, especially if the fracture is unstable or undergoes malunion. - It is a symptom or consequence that can be associated with failed healing or non-union, but **non-union** itself is the primary failure of bone repair.

Q: Which of the following statements about Galeazzi fracture dislocation is incorrect?

Ulna dislocates dorsally at DRUJ. ***Ulna dislocates dorsally at DRUJ*** - This statement is incorrect because in a **Galeazzi fracture-dislocation**, the **ulna typically dislocates volarly (anteriorly)** relative to the radius at the **distal radio-ulnar joint (DRUJ)**. - The DRUJ dislocation is usually in a volar direction due to the force of injury. *Fracture of distal third of radius and dislocation of DRUJ* - This is a hallmark of a **Galeazzi fracture-dislocation**, explicitly defining the two main components of the injury. - The **distal third of the radius** is the most common site of fracture, coupled with the disruption of the DRUJ. *Radius is angulated laterally and posteriorly* - This describes the typical displacement pattern of the **radial fracture fragment** in a Galeazzi injury. - The angulation often results from the forces acting on the forearm during the injury, with the pronator quadratus pulling the distal fragment volarly and an abduction force causing lateral angulation. *Results from fall on outstretched hand* - This is the most common mechanism of injury for a **Galeazzi fracture-dislocation**, similar to many other forearm and wrist fractures. - The axial load and pronation forces generated during a fall on an **outstretched hand** contribute to the characteristic fracture and dislocation.

Q: Chauffeur fracture is -

Intra-articular fracture of the radial styloid process. ***Intra-articular fracture of the radial styloid process*** - A **chauffeur fracture**, also known as a **Hutchinson fracture**, is an **intra-articular fracture** of the distal radius involving the radial styloid process. - This fracture often results from a **direct impact** or **compressive force** on the wrist, historically seen in individuals cranking early automobiles. *Intra-articular fracture of the base of the 1st metacarpal* - This description refers to a **Bennett's fracture**, which is a **two-part intra-articular fracture** of the base of the first metacarpal. - It is typically caused by **axial force** directed along the metacarpal, often from a punch, rather than a wrist-level injury. *Extra-articular fracture of the base of the 1st metacarpal* - An **extra-articular fracture** of the base of the 1st metacarpal is known as a **Rolando fracture** if comminuted, or a simpler extra-articular fracture. - These fractures do not involve the joint surface, distinguishing them from intra-articular fractures. *Extra-articular fracture of the styloid process* - While it involves the styloid process, an **extra-articular fracture of the styloid process** would imply a fracture not extending into the joint space. - A Chauffeur's fracture specifically involves the **articular surface** of the radial styloid, making this option incorrect.

Q: What is the management for the most dangerous type of odontoid fracture according to the Anderson and D'Alonzo classification?

Type II - screw fixation. **Type II - screw fixation** - **Type II odontoid fractures** are considered the most dangerous due to their location at the base of the dens, which has a **poor blood supply**, leading to a high rate of non-union. - **Screw fixation** (anterior odontoid screw fixation) is often preferred for Type II fractures to achieve stable internal fixation and promote healing. *Type I - immobilization in rigid collar* - **Type I odontoid fractures** are stable fractures of the tip of the dens, usually managed with a **rigid cervical collar** due to their excellent prognosis and low risk of instability. - This type does not represent the most dangerous category and typically heals well with conservative management. *Type III - halo vest immobilization* - **Type III odontoid fractures** involve the body of the axis and are generally more stable than Type II fractures due to a larger cancellous bone surface for healing. - While a **halo-vest immobilization** can be used, Type III fractures often have good healing potential and are not considered the most dangerous type. *Type III - immobilization in rigid collar* - Although some stable Type III fractures might be managed with rigid collar, it's not the primary or universal treatment, and this type is not the most dangerous. - More unstable Type III fractures might require **halo-vest immobilization** or surgical intervention, but the inherent instability and non-union risk of Type II make it the most critical.

Question 1

A clinician is assessing a patient for damage to the axillary nerve following a shoulder dislocation. Which clinical test should be performed to evaluate the integrity of this nerve?

Accepted Answer

Shoulder abduction test

Answer

Elbow flexion test

Answer

Wrist extension test

Answer

Finger adduction test

Question 2

Which clinical test is used to assess the integrity of the radial nerve following a mid-shaft humerus fracture?

Accepted Answer

Wrist drop test

Answer

Tinel's sign

Answer

Phalen's maneuver

Answer

Froment's sign

Question 3

Which technique involves realigning bone fragments through external manipulation without surgical intervention?

Accepted Answer

Closed reduction

Answer

Open reduction

Answer

External fixation

Answer

Internal fixation

Question 4

What is the most common complication of a posterior shoulder dislocation?

Accepted Answer

Reverse Hill-Sachs lesion

Answer

Bankart lesion

Answer

Rotator cuff tear

Answer

Fracture of the scapula

Question 5

In a pelvic fracture, which nerve is most at risk of injury due to its location within the pelvis?

Accepted Answer

Sciatic nerve

Answer

Femoral nerve

Answer

Obturator nerve

Answer

Pudendal nerve

Question 6

Most common complication of fracture of tibia

Accepted Answer

Delayed union

Answer

Infection

Answer

Compartment syndrome

Answer

Vascular injury

Question 7

The most common complication of intracapsular fracture neck of femur is

Accepted Answer

Non-Union

Answer

Mal union

Answer

Osteoarthritis

Answer

Shortening

Question 8

Which of the following statements about Galeazzi fracture dislocation is incorrect?

Accepted Answer

Ulna dislocates dorsally at DRUJ

Answer

Results from fall on outstretched hand

Answer

Fracture of distal third of radius and dislocation of DRUJ

Answer

Radius is angulated laterally and posteriorly

Question 9

Chauffeur fracture is -

Accepted Answer

Intra-articular fracture of the radial styloid process

Answer

Intra-articular fracture of the base of the 1st metacarpal

Answer

Extra-articular fracture of the base of the 1st metacarpal

Answer

Extra-articular fracture of the styloid process

Question 10

What is the management for the most dangerous type of odontoid fracture according to the Anderson and D'Alonzo classification?

Accepted Answer

Type II - screw fixation

Answer

Type I - immobilization in rigid collar

Answer

Type III - immobilization in rigid collar

Answer

Type III - halo vest immobilization

Trauma — MCQs

Trauma — MCQs

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