Trauma Practice Questions

Q: What is a major factor contributing to fat embolism in a trauma patient?

Mobility of a joint. **Explanation:** Fat Embolism Syndrome (FES) typically occurs following fractures of long bones (like the femur) or the pelvis. The pathophysiology is primarily explained by the **Mechanical Theory** (Gauss's Theory). **Why "Mobility of a joint" is correct:** The movement of fractured bone ends or the adjacent joint increases intramedullary pressure. This pressure gradient forces globules of fat from the bone marrow into the torn, non-collapsible venous sinusoids near the fracture site. Therefore, **inadequate immobilization** of a fracture is a major contributing factor to the release of fat emboli into the systemic circulation. Early splinting and internal fixation significantly reduce the risk of FES. **Why other options are incorrect:** * **Diabetes Mellitus:** While metabolic factors (Biochemical Theory) play a role in how fat behaves in the blood (chylomicron stability), Diabetes is not a recognized primary trigger or major risk factor for post-traumatic fat embolism. * **Respiratory failure:** This is a **consequence** (clinical manifestation) of fat embolism, not a contributing factor. FES typically presents with the classic triad of respiratory distress, neurological symptoms, and petechial rashes. **High-Yield Clinical Pearls for NEET-PG:** * **Gurd’s Criteria:** Used for diagnosis (Major: Petechial rash, Respiratory insufficiency, Cerebral involvement). * **Snowstorm Appearance:** Classic finding on Chest X-ray (diffuse bilateral infiltrates). * **Treatment:** Primarily supportive (Oxygenation/Ventilation). **Early stabilization of fractures** is the most effective preventive measure. * **Free Fatty Acids:** According to the Biochemical Theory, the breakdown of fat into free fatty acids causes direct toxic injury to lung pneumocytes.

Q: The "Apprehension sign" is seen in dislocation of which joint?

Shoulder joint. **Explanation:** The **Apprehension Test** is the hallmark clinical examination for **recurrent anterior instability of the shoulder joint**. 1. **Why Shoulder Joint is Correct:** In patients with a history of anterior shoulder dislocation, placing the arm in a position of **abduction and external rotation** (the most vulnerable position) mimics the mechanism of dislocation. The patient becomes anxious or "apprehensive," fearing the humeral head will slip out of the glenoid cavity. They may resist further movement or contract the pectoralis major to stabilize the joint. This is a positive Apprehension sign, often followed by the **Relocation Test (Jobe’s test)**, where posterior pressure on the humerus relieves the anxiety. 2. **Why Other Options are Incorrect:** * **Hip Joint:** Dislocation is usually traumatic and stable once reduced. Clinical signs focus on limb shortening and rotation (internal for posterior, external for anterior). * **Elbow Joint:** Stability is assessed via varus/valgus stress tests or the Pivot-shift test for posterolateral rotatory instability. * **Patella:** While there is a specific **Fairbank’s Apprehension Test** for recurrent patellar dislocation (lateral displacement of the patella causes apprehension), the standard "Apprehension sign" without qualification traditionally refers to the shoulder in orthopedic nomenclature. **High-Yield Clinical Pearls for NEET-PG:** * **Bankart Lesion:** Avulsion of the anterior-inferior glenoid labrum; the most common cause of recurrent shoulder dislocation. * **Hill-Sachs Lesion:** A compression fracture of the posterolateral humeral head. * **Nerve Injury:** The **Axillary nerve** is the most commonly injured nerve in anterior shoulder dislocations (look for "regimental badge" anesthesia). * **Most Common Dislocation:** Anterior shoulder dislocation is the most common joint dislocation in the body.

Q: A 6-year-old boy has a history of recurrent dislocation of the right shoulder. On examination, the orthopedician puts the patient in the supine position, abducts his arm to 90 degrees with the bed as the fulcrum, and then externally rotates it. However, the boy does not allow the test to be performed. What is the name of the test performed by the orthopedician?

Apprehension test. The clinical scenario describes the **Apprehension Test**, which is the gold standard for diagnosing **Anterior Shoulder Instability**. ### Why the Correct Answer is Right The test is performed by placing the patient in a supine position, abducting the arm to 90°, and then applying external rotation. This maneuver mimics the position of most frequent dislocations (anteroinferior). In a patient with recurrent instability, this movement causes the humeral head to glide anteriorly, creating a sensation of impending dislocation. The "positive" sign is not pain, but rather the patient’s **apprehension** (anxiety or resistance) and refusal to allow further movement. ### Explanation of Incorrect Options * **B. Sulcus test:** Used to assess **inferior or multidirectional instability**. It is performed by pulling the arm downward (inferior traction); a positive result is a visible "gap" or sulcus between the acromion and the humeral head. * **C. Dugas test:** Used to diagnose **acute shoulder dislocation**. A patient with a dislocated shoulder cannot touch the opposite shoulder with their hand while the elbow is touching the chest. * **D. McMurray's test:** A physical exam maneuver used to identify **meniscal tears in the knee**, involving rotation of the tibia on the femur. It is irrelevant to shoulder trauma. ### NEET-PG High-Yield Pearls * **Relocation Test (Jobe’s Test):** If the apprehension test is positive, applying a posterior pressure on the humeral head relieves the apprehension, confirming anterior instability. * **Bankart Lesion:** The most common cause of recurrent anterior dislocation, involving an avulsion of the anteroinferior labrum. * **Hill-Sachs Lesion:** A compression fracture of the posterolateral humeral head, often seen on X-ray (Stryker notch view) in these patients.

Q: Volkmann's ischemic contracture is associated with which of the following conditions?

Supracondylar fracture of the humerus. **Explanation:** **Volkmann’s Ischemic Contracture (VIC)** is the late-stage sequela of untreated **Acute Compartment Syndrome**, typically occurring in the forearm. **Why Option B is Correct:** The **Supracondylar fracture of the humerus** (specifically the extension type) is the most common cause of VIC in children. The mechanism involves injury to the **brachial artery** or intense swelling within the tight fascial compartments of the forearm. Ischemia leads to muscle infarction and subsequent fibrosis. The classic clinical picture is a permanent flexion deformity of the wrist and fingers (claw-hand) due to the shortening of the fibrotic flexor muscles (primarily Flexor Digitorum Profundus and Flexor Pollicis Longus). **Why Other Options are Incorrect:** * **Option A:** Intertrochanteric fractures occur in a large space with significant volume capacity; while they cause blood loss, they rarely lead to compartment syndrome or ischemic contracture. * **Option C:** Posterior dislocation of the knee can damage the **popliteal artery**, leading to limb ischemia or compartment syndrome of the leg, but the specific eponymous term "Volkmann’s Ischemic Contracture" is traditionally reserved for the forearm. * **Option D:** Traumatic shoulder separation (Acromioclavicular joint injury) involves ligamentous damage and does not compromise the distal neurovascular status of the limb. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign:** Pain out of proportion to the injury and pain on passive stretching of muscles. * **The 5 P’s:** Pain, Pallor, Pulselessness, Paresthesia, and Paralysis (Note: Pulselessness is a *late* sign). * **Nerve Involvement:** The **Median nerve** is the most commonly affected nerve in VIC. * **Treatment:** Immediate removal of tight bandages/casts; if no improvement, urgent **fasciotomy** is required to prevent permanent contracture.

Q: McMurray's test is positive in which of the following injuries?

Medial meniscus injury. **Explanation:** **McMurray’s test** is a clinical provocative maneuver used to diagnose **meniscal tears**. The test relies on the principle that rotating the tibia while extending the knee traps the torn meniscal fragment between the femoral condyle and the tibial plateau, eliciting a painful "click" or "thud." * **Why Option C is correct:** To test the **medial meniscus**, the examiner flexes the patient's knee, applies a **valgus stress** (to open the joint space), and **externally rotates** the tibia while slowly extending the knee. A positive test is indicated by a palpable or audible click over the medial joint line. * **Why Options A & B are incorrect:** Ligamentous injuries are assessed using different maneuvers. The **Anterior Cruciate Ligament (ACL)** is evaluated via the Lachman test (most sensitive), Anterior Drawer test, and Pivot Shift test. The **Posterior Cruciate Ligament (PCL)** is evaluated via the Posterior Drawer test and the Sag sign. * **Why Option D is incorrect:** Popliteal bursitis (Baker’s cyst) typically presents as a swelling in the popliteal fossa and is not diagnosed through rotational provocative maneuvers. **Clinical Pearls for NEET-PG:** 1. **Rotation Rule:** **E**xternal rotation tests the **M**edial meniscus (**EM**), while **I**nternal rotation tests the **L**ateral meniscus (**IL**). 2. **Thessaly Test:** Currently considered the most clinically accurate physical exam test for meniscal tears (performed with the patient standing on one leg at 20° flexion). 3. **Apley’s Grinding Test:** Another common test for meniscal injury; distraction relieves pain in meniscal tears but increases pain in ligamentous injuries. 4. **Gold Standard:** MRI is the investigation of choice, but Arthroscopy remains the gold standard for diagnosis.

Q: Vascular necrosis can be a possible sequelae of fracture of all of the following bones, EXCEPT:

Calcaneum. **Explanation:** Avascular Necrosis (AVN) occurs when the blood supply to a bone is disrupted, leading to bone cell death. This typically occurs in bones that have a **precarious blood supply**, often characterized by a retrograde flow or a lack of significant muscular attachments and collateral circulation. **Why Calcaneum is the Correct Answer:** The **Calcaneum** is a highly vascular bone with a rich blood supply derived from multiple sources (medial and lateral plantar arteries and the calcaneal anastomosis). It is composed primarily of cancellous bone. Due to this robust vascularity, AVN is virtually never seen following a calcaneal fracture. Instead, the most common complication of calcaneal fractures is post-traumatic arthritis of the subtalar joint. **Analysis of Other Options:** * **Talus:** The talus is notorious for AVN (Hawkins’ Sign is used to predict it). It is 60% covered by articular cartilage and has no muscular attachments. The blood supply (mainly via the artery of the tarsal canal) is easily disrupted in neck fractures. * **Femur Neck:** The femoral head relies on the retrograde flow from the medial circumflex femoral artery. Intracapsular fractures disrupt these vessels, making AVN a very high-risk complication. * **Scaphoid:** The scaphoid has a retrograde blood supply entering through the distal pole. A fracture at the waist or proximal pole cuts off the blood to the proximal fragment, leading to a high incidence of AVN. **NEET-PG Clinical Pearls:** * **Common sites for AVN:** Head of femur (most common), proximal pole of scaphoid, body of talus, and capitate. * **Hawkins’ Sign:** Subchondral lucency in the talus seen 6–8 weeks post-fracture; its presence indicates intact vascularity (a good prognostic sign). * **Preiser’s Disease:** Idiopathic AVN of the scaphoid. * **Kohler’s Disease:** AVN of the navicular bone in children.

Q: Which of the following tests is positive in anterior dislocation of the shoulder?

Duga's test. **Explanation:** **Duga’s Test** is a classic clinical sign used to diagnose **Anterior Dislocation of the Shoulder**. In a normal shoulder, a person can touch the opposite shoulder with their hand while the elbow is in contact with the chest wall. In anterior dislocation, the humeral head is displaced from the glenoid cavity, making it mechanically impossible to touch the opposite shoulder while the elbow is adducted against the chest. **Analysis of Incorrect Options:** * **Thomas Test:** Used to assess **fixed flexion deformity (FFD) of the hip**. It involves flexing the contralateral hip to flatten lumbar lordosis; if the affected thigh rises off the table, the test is positive. * **Barlow’s Test:** A provocative maneuver used in **Developmental Dysplasia of the Hip (DDH)**. It attempts to dislocate a reducible hip by adducting the hip and applying a posterior force. * **McMurray’s Test:** Used to diagnose **meniscal tears** in the knee. It involves rotation of the tibia on the femur while extending the knee from a flexed position. **High-Yield Clinical Pearls for NEET-PG:** 1. **Other Tests for Shoulder Dislocation:** * **Hamilton Ruler Test:** A straight ruler can touch both the acromion and the lateral epicondyle simultaneously (impossible in a normal shoulder). * **Callaway’s Test:** The vertical axillary girth is increased. 2. **Most Common Type:** Anterior dislocation is the most common (Subcoracoid is the most frequent subtype). 3. **Nerve Injury:** The **Axillary nerve** is the most commonly injured nerve in anterior shoulder dislocations (tested by checking sensation over the "Regimental Badge" area). 4. **Radiology:** Look for the **Hill-Sachs lesion** (posterolateral humeral head defect) and **Bankart’s lesion** (anteroinferior glenoid labrum tear).

Question 1

What is a major factor contributing to fat embolism in a trauma patient?

Accepted Answer

Mobility of a joint

Answer

Diabetes Mellitus

Answer

Respiratory failure

Answer

All of the above

Question 2

The "Apprehension sign" is seen in dislocation of which joint?

Accepted Answer

Shoulder joint

Answer

Hip joint

Answer

Elbow joint

Answer

Patella

Question 3

A 6-year-old boy has a history of recurrent dislocation of the right shoulder. On examination, the orthopedician puts the patient in the supine position, abducts his arm to 90 degrees with the bed as the fulcrum, and then externally rotates it. However, the boy does not allow the test to be performed. What is the name of the test performed by the orthopedician?

Accepted Answer

Apprehension test

Answer

Sulcus test

Answer

Dugas test

Answer

McMurray's test

Question 4

Resolving arthroplasty is seen in which of the following?

Accepted Answer

Shoulder dislocation

Answer

Elbow dislocation

Answer

Knee dislocation

Answer

Hip dislocation

Question 5

Traumatic dislocation of the hip is characterized by which of the following deformities?

Accepted Answer

Adduction and internal rotation deformity

Answer

Abduction and external rotation deformity

Answer

Adduction and external rotation deformity

Answer

Abduction and internal rotation deformity

Question 6

Volkmann's ischemic contracture is associated with which of the following conditions?

Accepted Answer

Supracondylar fracture of the humerus

Answer

Intertrochanteric femoral fracture

Answer

Posterior dislocation of the knee

Answer

Traumatic shoulder separation

Question 7

McMurray's test is positive in which of the following injuries?

Accepted Answer

Medial meniscus injury

Answer

Anterior cruciate ligament

Answer

Posterior cruciate ligament

Answer

Popliteal bursitis

Question 8

Vascular necrosis can be a possible sequelae of fracture of all of the following bones, EXCEPT:

Accepted Answer

Calcaneum

Answer

Talus

Answer

Femur neck

Answer

Scaphoid

Question 9

Which of the following tests is positive in anterior dislocation of the shoulder?

Accepted Answer

Duga's test

Answer

Thomas test

Answer

Barlow's test

Answer

McMurry's test

Question 10

A 40-year-old man presents to the orthopedics emergency with a deformity following lifting a heavy load. Ultrasonography reveals a specific finding. Which of the following structures is affected?

Accepted Answer

Structure C

Answer

Structure B

Answer

Structure A

Answer

Structure D

Trauma — MCQs

Trauma — MCQs

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