Trauma Practice Questions

Q: Recurrent dislocations are common in which joint?

Shoulder. **Explanation:** The **Shoulder (Glenohumeral) joint** is the most common joint in the body to undergo recurrent dislocation. This is primarily due to its unique anatomy: it is a "ball-and-socket" joint characterized by a large humeral head articulating with a small, shallow glenoid cavity (often compared to a golf ball on a tee). While this allows for an extraordinary range of motion, it inherently sacrifices stability. Recurrence is frequently driven by the failure of soft tissue stabilizers to heal, specifically the **Bankart lesion** (avulsion of the anterior-inferior labrum) and the **Hill-Sachs lesion** (compression fracture of the posterolateral humeral head). Age is the most significant predictor of recurrence; the younger the patient at the time of the first dislocation, the higher the risk of recurrence. **Analysis of Incorrect Options:** * **Patella:** While patellar dislocations can be recurrent (often due to trochlear dysplasia or ligamentous laxity), they are statistically less common than shoulder recurrences in the general population. * **Hip Joint:** The hip is a highly stable, deep socket joint with strong ligamentous support. Dislocation usually requires high-energy trauma (e.g., dashboard injuries), and recurrence is rare unless there is significant bony destruction. * **Elbow Joint:** The elbow is the second most common joint to dislocate in adults, but it possesses high bony stability. Once reduced, it rarely becomes recurrent unless there is an associated fracture (e.g., "Terrible Triad"). **High-Yield Clinical Pearls for NEET-PG:** * **Most common direction:** Anterior (95%), specifically the subcoracoid type. * **Nerve at risk:** Axillary nerve (tested by sensation over the "regimental badge" area). * **Key Radiographic View:** Axillary view or Stryker notch view (for Hill-Sachs). * **Gold Standard Surgery:** Arthroscopic Bankart repair.

Q: In an open injury during toileting and debridement, what indicates muscle viability?

Muscle contractility. In the management of open fractures, assessing muscle viability is critical during surgical debridement to prevent infection and gas gangrene. The standard clinical assessment follows the **"4 Cs" rule**. ### Why "Muscle Contractility" is the Correct Answer While all 4 Cs are used, **contractility** (the muscle’s ability to contract when stimulated by a forceps or diathermy) is considered the **most reliable and objective clinical indicator** of muscle viability. A muscle that contracts has an intact motor end-plate and sufficient physiological reserve, suggesting it can recover. ### Explanation of Incorrect Options * **A. Colour:** While healthy muscle is typically beefy red, colour is the **least reliable** indicator. Muscle may appear bruised or pale due to local trauma or surface oxidation but still be viable. * **C. Punctate bleeding:** Bleeding indicates intact microcirculation. While a very strong sign of viability, it can sometimes be misleading if there is passive venous congestion or if the patient is hypotensive. * **D. Muscle function:** This refers to the patient’s ability to actively move the limb. In an acute trauma setting, muscle function cannot be assessed due to pain, nerve injury, or the use of anesthesia/muscle relaxants during surgery. ### Clinical Pearls for NEET-PG: The "4 Cs" of Muscle Viability When performing debridement, surgeons evaluate these four criteria (ranked from most to least reliable): 1. **Contractility:** Response to stimulus (Most reliable). 2. **Capillary Bleeding:** Punctate bleeding when cut. 3. **Consistency:** Viable muscle is firm and resilient; dead muscle is friable/mushy. 4. **Colour:** Red vs. dark/dusky (Least reliable). **High-Yield Note:** If a muscle fails the contractility test, it is generally considered non-viable and should be excised to reduce the risk of *Clostridial* infections.

Q: Which of the following is NOT a component of the management of fat embolism syndrome?

Streptokinase therapy. **Explanation:** Fat Embolism Syndrome (FES) is a clinical diagnosis characterized by the triad of respiratory distress, neurological symptoms, and petechial rashes, typically occurring 24–72 hours after long bone fractures. **Why Streptokinase is the Correct Answer (NOT used):** Streptokinase is a thrombolytic agent used to dissolve blood clots (fibrin) in conditions like myocardial infarction or pulmonary thromboembolism. FES is caused by **fat globules** and the subsequent inflammatory response (free fatty acids), not by fibrin-based thrombi. Therefore, thrombolytics have no role and may increase the risk of bleeding in trauma patients. **Analysis of Other Options:** * **Oxygen Therapy:** This is the **most important** aspect of management. Maintaining arterial oxygenation (often requiring mechanical ventilation) is the mainstay of treatment as FES is self-limiting if the patient is supported through the respiratory crisis. * **Heparin Administration:** Historically used to clear lipemia by stimulating lipoprotein lipase. While its routine use is now controversial due to bleeding risks, it remains a documented (though secondary) pharmacological consideration in some protocols. * **Corticosteroids:** High-dose corticosteroids (e.g., Methylprednisolone) are used to reduce the inflammatory pulmonary edema and stabilize capillary membranes, although their prophylactic use is more evidence-based than therapeutic use. **High-Yield Clinical Pearls for NEET-PG:** * **Gurd’s Criteria:** Used for diagnosis (Major: Petechial rash, Respiratory insufficiency, CNS depression). * **Snowstorm Appearance:** Classic finding on Chest X-ray. * **Earliest Sign:** Tachycardia. * **Most Pathognomonic Sign:** Petechial rash (found in the conjunctiva, axilla, and neck). * **Prevention:** Early stabilization and internal fixation of long bone fractures is the best way to prevent FES.

Q: What is the treatment for an undisplaced fracture of the patella?

Tube cast. **Explanation:** The primary goal in managing patellar fractures is to restore the extensor mechanism of the knee and ensure articular congruity. **Why Option A is Correct:** An **undisplaced fracture** is defined by less than 2mm of articular step-off and less than 3mm of fragment separation. In such cases, the extensor expansion (medial and lateral retinacula) remains intact, meaning the patient can actively extend the knee. Conservative management is indicated, typically using a **Cylindrical (Tube) cast** or a long knee brace for 4–6 weeks. This immobilizes the joint in extension, allowing the fracture to heal while preventing displacement by the quadriceps pull. **Why Other Options are Incorrect:** * **B. Nailing:** Intramedullary nailing is not a standard procedure for patellar fractures due to the bone's unique anatomy and subcutaneous location. * **C. Tension Band Wiring (TBW):** This is the **gold standard for displaced** transverse patellar fractures. It converts tensile forces from the quadriceps into compressive forces across the fracture site. It is unnecessary for undisplaced fractures. * **D. Observation:** While the fracture is undisplaced, it is unstable under the physiological pull of the quadriceps. Simple observation without immobilization risks displacement and failure of the extensor mechanism. **High-Yield Clinical Pearls for NEET-PG:** * **Indications for Surgery:** Displacement >3mm or articular step-off >2mm, or a disrupted extensor mechanism (inability to perform a Straight Leg Raise). * **Modified TBW:** Uses two parallel K-wires and a stainless steel wire in a "figure-of-eight" fashion. * **Patellectomy:** Reserved for severely comminuted (shattered) fractures where reconstruction is impossible (Stellate fractures). * **Radiology:** The **Sunrise view** (Axial view) is best for visualizing vertical fractures, while the Lateral view is best for transverse fractures.

Q: Complications of Colles' fracture include all EXCEPT:

Gunstock deformity. **Explanation:** The correct answer is **Gunstock deformity** because it is a characteristic complication of **Supracondylar fracture of the humerus**, not Colles' fracture. Gunstock deformity (cubitus varus) occurs due to the malunion of the distal humerus, leading to a decrease in the carrying angle of the elbow. **Analysis of Options:** * **Malunion (Option A):** This is the **most common complication** of Colles' fracture. It typically results in a "Dinner Fork Deformity" due to the dorsal tilt and radial shortening of the distal radius. * **Carpal Tunnel Syndrome (Option B):** Acute median nerve compression can occur due to excessive edema or hematoma within the carpal tunnel, or chronically due to bony irregularities following malunion. * **Shoulder-hand Syndrome (Option C):** Also known as Reflex Sympathetic Dystrophy (CRPS Type 1), this is a distressing complication characterized by pain, swelling, and stiffness of the hand and shoulder, often triggered by prolonged immobilization or tight casting. **High-Yield Clinical Pearls for NEET-PG:** 1. **Eponymous Deformity:** Colles' fracture presents with a **Dinner Fork Deformity**. 2. **Most Common Complication:** Malunion. 3. **EPL Rupture:** Spontaneous rupture of the **Extensor Pollicis Longus (EPL)** tendon is a classic late complication (usually 4–8 weeks post-injury) due to ischemia or friction at Lister’s tubercle. 4. **Sudeck’s Atrophy:** Another name for the vasomotor complications (CRPS) associated with this fracture. 5. **Reverse Colles:** Known as **Smith’s fracture**, where the distal fragment is displaced volarly (Garden Spade deformity).

Q: Which of the following conditions does not involve nerve damage?

Volkmann's contracture. **Explanation:** The correct answer is **Volkmann’s Ischemic Contracture (VIC)** because it is primarily a **vascular and muscular pathology**, not a direct nerve injury. 1. **Why Volkmann’s Contracture is correct:** VIC is the late-stage sequela of untreated **Compartment Syndrome**, most commonly following a supracondylar fracture of the humerus. The underlying mechanism is **ischemic necrosis of the forearm muscles** (specifically the deep flexors like Flexor Digitorum Profundus and Flexor Pollicis Longus). While nerves may be compressed due to high compartment pressure, the "contracture" itself is the result of muscle infarct being replaced by fibrous tissue. 2. **Why the other options are incorrect:** * **Guillain-Barré Syndrome (GBS):** An acute inflammatory demyelinating polyradiculoneuropathy. It involves autoimmune destruction of the **myelin sheath of peripheral nerves**. * **Erb’s Paralysis:** A lower motor neuron lesion resulting from damage to the **upper trunk of the brachial plexus (C5-C6)**, typically due to birth trauma or traction. * **Neurotmesis:** The most severe grade of nerve injury (Seddon’s classification) involving **complete physiological and anatomical disruption** of the nerve and its connective tissue sheath. **NEET-PG High-Yield Pearls:** * **Classic Sign of VIC:** Volkmann’s sign (passive extension of fingers is painful and limited; fingers can only be extended when the wrist is flexed). * **Earliest Sign of Compartment Syndrome:** Pain out of proportion to the injury and pain on passive stretching of muscles. * **Nerve most commonly involved in VIC:** Median nerve (due to its deep location in the forearm). * **Order of tissue sensitivity to ischemia:** Nerve (6 hours) > Muscle (8 hours) > Bone.

Q: What is the most commonly dislocated joint in the body?

Shoulder. **Explanation:** The **Shoulder joint (Glenohumeral joint)** is the most commonly dislocated joint in the body. This is primarily due to its unique anatomy: it is a "ball-and-socket" joint characterized by a large humeral head and a disproportionately small, shallow glenoid cavity (often compared to a golf ball on a tee). While this configuration allows for the greatest range of motion of any joint, it inherently sacrifices stability, making it highly susceptible to displacement. **Analysis of Options:** * **Shoulder (Correct):** Approximately 50% of all major joint dislocations involve the shoulder. The **Anterior** type is the most frequent (95%). * **Hip:** This is a very stable, deep ball-and-socket joint reinforced by strong ligaments (like the Bigelow ligament). Dislocation usually requires high-energy trauma, such as a dashboard injury in a motor vehicle accident. * **Elbow:** This is the **most common dislocation in children**, but it ranks second to the shoulder in adults. It is typically a posterior dislocation. * **Knee:** True tibiofemoral dislocations are rare and represent a surgical emergency due to the high risk of popliteal artery injury. (Note: Patellar dislocations are more common than knee dislocations but less common than shoulder dislocations). **High-Yield Clinical Pearls for NEET-PG:** * **Most common direction:** Anterior (Subcoracoid is the most common subtype). * **Nerve at risk:** Axillary nerve (tested by sensation over the "Regimental Badge" area). * **Associated Lesions:** Bankart lesion (avulsion of anterior-inferior labrum) and Hill-Sachs lesion (compression fracture of posterolateral humeral head). * **Recurrence:** The younger the patient at the time of first dislocation, the higher the risk of recurrence.

Question 1

Recurrent dislocations are common in which joint?

Accepted Answer

Shoulder

Answer

Patella

Answer

Hip joint

Answer

Elbow joint

Question 2

A compound fracture is initially treated by antibiotics and wound toilet. What is the next appropriate step in management?

Accepted Answer

External splintage

Answer

Skin cover

Answer

Prosthesis

Answer

Internal fixation

Question 3

A 44-year-old woman suffers a right tibial plateau fracture after a motor vehicle accident. She is neurovascularly intact with soft compartments and has no other significant injuries apart from a minor concussion and several broken ribs. Which of the following, if present, is an indication for operative fixation?

Accepted Answer

Articular step-off of 5 mm

Answer

ACL tear on follow-up MRI

Answer

Condylar widening less than 3 mm

Answer

Lateral meniscal tear on follow-up MRI

Question 4

In an open injury during toileting and debridement, what indicates muscle viability?

Accepted Answer

Muscle contractility

Answer

Colour of the muscle

Answer

Punctate bleeding spots on the cut edge

Answer

Muscle function

Question 5

Which of the following is NOT a component of the management of fat embolism syndrome?

Accepted Answer

Streptokinase therapy

Answer

Oxygen therapy

Answer

Heparin administration

Answer

Corticosteroid use

Question 6

A 30-year-old male presented to the ER with an abnormal position of the right upper limb. The range of motion was reduced at the right shoulder, and the patient was in severe pain. On examination, the arm was in an abducted and externally rotated position. Neurovascular examination was normal. Which of the following X-rays most likely corresponds with the above condition?

Accepted Answer

X-ray showing shoulder dislocation with the humeral head anteriorly displaced and externally rotated.

Answer

X-ray showing shoulder dislocation with the humeral head posteriorly displaced and internally rotated.

Answer

X-ray showing a typical shoulder fracture.

Answer

All of the above

Question 7

What is the treatment for an undisplaced fracture of the patella?

Accepted Answer

Tube cast

Answer

Nailing

Answer

Tension band wiring

Answer

Observation

Question 8

Complications of Colles' fracture include all EXCEPT:

Accepted Answer

Gunstock deformity

Answer

Malunion

Answer

Carpal tunnel syndrome

Answer

Shoulder-hand syndrome

Question 9

Which of the following conditions does not involve nerve damage?

Accepted Answer

Volkmann's contracture

Answer

Guillain-Barré syndrome

Answer

Erb's paralysis

Answer

Neurotmesis

Question 10

What is the most commonly dislocated joint in the body?

Accepted Answer

Shoulder

Answer

Hip

Answer

Elbow

Answer

Knee

Trauma — MCQs

Trauma — MCQs

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