Trauma Practice Questions

Q: A Hill-Sachs lesion is typically seen in which anatomical location?

Humeral head. **Explanation:** A **Hill-Sachs lesion** is a classic radiological finding in patients with recurrent **anterior shoulder dislocation**. It is a compression fracture (impaction fracture) of the **posterosuperolateral aspect of the humeral head**. **Why the correct answer is right:** When the humeral head is displaced anteriorly and inferiorly during a dislocation, its posterior surface strikes against the sharp anterior-inferior edge of the glenoid labrum. This mechanical impact creates a "divot" or wedge-shaped defect in the **humeral head**. It is best visualized on an AP view of the shoulder with internal rotation or a Stryker notch view. **Why the incorrect options are wrong:** * **B. Femoral head:** Fractures here are typically associated with hip dislocations or femoral neck fractures (e.g., Pipkin classification), not Hill-Sachs lesions. * **C. Tibial shaft:** Injuries here are usually diaphyseal fractures resulting from direct trauma or twisting forces (e.g., toddler's fracture or stress fractures). * **D. Skull base:** Fractures here (e.g., Battle’s sign) are neurosurgical emergencies resulting from high-energy head trauma. **NEET-PG High-Yield Pearls:** 1. **Reverse Hill-Sachs Lesion:** An impaction fracture of the *anterior* humeral head, seen in **posterior shoulder dislocations**. 2. **Bankart Lesion:** Often co-exists with Hill-Sachs; it is an avulsion of the anterior-inferior glenoid labrum. 3. **Imaging:** While X-rays are initial, **MRI** is the gold standard for soft tissue (Bankart), and **CT** is best for quantifying bone loss in the humeral head. 4. **Clinical Sign:** Recurrent dislocations are often associated with a positive **Apprehension Test**.

Q: Which muscle is tested by the "lift off" test?

Subscapularis. **Explanation:** The **Lift-off test** (Gerber’s test) is the clinical gold standard for assessing the integrity of the **Subscapularis** muscle. **1. Why Subscapularis is correct:** The subscapularis is the primary **internal rotator** of the shoulder. To perform the test, the patient places the dorsum of their hand against their mid-lumbar spine and attempts to lift the hand away from the back. This position puts the shoulder in maximum internal rotation, isolating the subscapularis. An inability to lift the hand or maintain the position against resistance indicates a tear or weakness of the subscapularis tendon. **2. Why other options are incorrect:** * **Infraspinatus & Teres Minor:** These muscles are the primary **external rotators** of the shoulder. They are typically tested using the "Hornblower’s sign" or by resisting external rotation with the elbow at the side. * **Supraspinatus:** This muscle initiates the first 15° of **abduction**. It is specifically evaluated using the **"Empty Can" test (Jobe’s test)** or the "Full Can" test. **Clinical Pearls for NEET-PG:** * **Belly Press Test:** An alternative for subscapularis if the patient lacks the internal rotation range to reach behind their back. * **Rotator Cuff Components (SITS):** Supraspinatus (Abduction), Infraspinatus (External rotation), Teres minor (External rotation), and Subscapularis (Internal rotation). * **Most common rotator cuff tear:** Supraspinatus. * **Nerve Supply:** Subscapularis is supplied by the Upper and Lower Subscapular nerves (C5-C6).

Q: Smith's fracture involves which bone?

Distal radius. **Explanation:** **Smith’s fracture** is a fracture of the **distal radius** with **volar (palmar) displacement** of the distal fragment. It is often referred to as a "Reverse Colles' fracture" because the displacement occurs in the opposite direction. It typically results from a fall on the back of a flexed wrist or a direct blow to the dorsal aspect of the forearm. **Analysis of Options:** * **A. Distal radius (Correct):** Smith’s fracture specifically involves the distal metaphysis of the radius. On clinical examination, it presents with a **"Garden Spade deformity"** due to the volar angulation. * **B. Proximal ulna:** Fractures of the proximal ulna are associated with conditions like **Monteggia fracture-dislocation** (proximal ulna fracture with radial head dislocation) or Olecranon fractures, but not Smith's. * **C. Metatarsal:** Common fractures here include **Jones fracture** (5th metatarsal base) or **March fracture** (stress fracture of the shaft), which involve the foot, not the wrist. * **D. Patella:** This is the largest sesamoid bone; injuries here are usually due to direct trauma or sudden quadriceps contraction, unrelated to distal radius eponyms. **High-Yield Clinical Pearls for NEET-PG:** * **Colles' Fracture:** Distal radius fracture with **dorsal** displacement ("Dinner Fork deformity"); caused by falling on an outstretched hand (FOOSH). * **Barton’s Fracture:** Intra-articular fracture of the distal radius with dislocation of the radiocarpal joint (can be Volar or Dorsal). * **Chauffeur’s Fracture:** Intra-articular fracture of the **radial styloid process**. * **Management:** Smith’s fractures are often unstable and frequently require Open Reduction and Internal Fixation (ORIF) with a volar locking plate.

Q: A 33-year-old rugby player presents for follow-up after a first-time anterior shoulder dislocation 6 weeks ago. The shoulder has remained reduced. On examination, he has a good range of painless active and passive motion. Which of the following is considered a dynamic stabilizer of the glenohumeral joint?

Subscapularis muscle. **Explanation:** The stability of the glenohumeral joint depends on a complex interplay between static and dynamic stabilizers. **1. Why Subscapularis is Correct:** The **Subscapularis** is a component of the **Rotator Cuff**, which serves as the primary **dynamic stabilizer** of the shoulder. Dynamic stabilizers are active structures (muscles and tendons) that provide stability through contraction and "concavity-compression"—pressing the humeral head into the glenoid fossa during movement. Other dynamic stabilizers include the long head of the biceps, deltoid, and scapulothoracic musculature. **2. Why the other options are incorrect:** * **Glenoid fossa (A):** This is a bony structure that provides a shallow socket for the humeral head. It is a **static stabilizer**. * **Coracohumeral ligament (B):** This is a ligamentous structure that limits inferior translation and external rotation of the adducted arm. It is a **static stabilizer**. * **Anteroinferior labral complex (C):** The labrum increases the depth of the glenoid and acts as an anchor for the glenohumeral ligaments. It is a **static stabilizer**. (Note: An injury here is known as a Bankart lesion, the most common cause of recurrent instability). **High-Yield Clinical Pearls for NEET-PG:** * **Static Stabilizers:** Bony anatomy, Glenoid labrum, Glenohumeral ligaments (Superior, Middle, and Inferior), and negative intra-articular pressure. * **Inferior Glenohumeral Ligament (IGHL):** The most important static stabilizer against anterior dislocation when the shoulder is in **abduction and external rotation**. * **Rotator Cuff Muscles (SITS):** Supraspinatus, Infraspinatus, Teres minor, and Subscapularis. * **Bankart Lesion:** Avulsion of the anteroinferior labrum; the "essential lesion" in recurrent anterior dislocations.

Q: A deviation of the mandible to the right side may suggest which of the following conditions?

Fracture of the right condyle. **Explanation:** The direction of mandibular deviation is a high-yield clinical sign in orthopaedics and maxillofacial trauma. The movement of the mandible is primarily controlled by the **Lateral Pterygoid muscle**, which inserts into the pterygoid fovea on the neck of the condyle. Its primary action is to protrude the mandible and move it to the **opposite side**. **Why Option D is correct:** In a **fracture of the right condyle**, the function of the right lateral pterygoid is lost or inhibited. When the patient attempts to open their mouth, the left lateral pterygoid remains functional and pushes the mandible forward and toward the right. Since there is no counteracting force from the injured right side, the **mandible deviates toward the side of the lesion (the fractured side).** **Analysis of Incorrect Options:** * **Option A (Fracture of left condyle):** This would cause deviation to the **left** side, as the right lateral pterygoid would act unopposed. * **Option B (Hyperplasia of right condyle):** Excessive growth on the right side would push the midline of the mandible toward the **left** (opposite side) due to the increased physical bulk and length of the bone. * **Option C (Hypoplasia of left condyle):** While this causes asymmetry, the deviation during opening is typically toward the affected (underdeveloped) side. Therefore, left hypoplasia would cause deviation to the **left**. **Clinical Pearls for NEET-PG:** * **Rule of Thumb:** In lower motor neuron lesions of the Trigeminal nerve (CN V) or condylar fractures, the **jaw deviates toward the side of the lesion.** * **Bilateral Condylar Fracture:** Results in an **anterior open bite** because the ramus is shortened on both sides, causing the posterior teeth to meet prematurely. * **Guardman’s Fracture:** A midline symphysis fracture associated with bilateral condylar fractures, often caused by a direct blow to the chin.

Q: What is the first muscle affected in compartment syndrome?

Flexor Digitorum profundus. ### Explanation **Concept:** Compartment syndrome occurs when increased interstitial pressure within a closed osteofascial space compromises local blood circulation. In the forearm, the **deep volar compartment** is most susceptible to ischemia because it lies closest to the bone (radius and ulna), where the pressure rise is most significant and the blood supply is most easily compromised. **Why Flexor Digitorum Profundus (FDP) is the Correct Answer:** The **Flexor Digitorum Profundus** is the deepest muscle in the volar forearm. Due to its anatomical position adjacent to the bone and its relatively distal blood supply, it is the first muscle to undergo ischemic necrosis in compartment syndrome of the forearm. This is why the earliest clinical sign of Volkmann’s Ischemic Contracture (VIC) is often pain on passive extension of the fingers (stretching the FDP). **Analysis of Incorrect Options:** * **A. Flexor Digitorum Sublimis (Superficialis):** This muscle lies in the superficial volar compartment. While it is affected as the syndrome progresses, it is not the first to suffer ischemia. * **C & D. Flexor Carpi Ulnaris/Radialis:** These are superficial muscles. They are generally more resistant to the initial pressure increases compared to the deep-seated FDP. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign:** Pain out of proportion to the injury and **pain on passive stretching** of the involved muscles. * **Most Common Site:** The leg (Anterior compartment) is the most common site overall; the forearm is the most common site in the upper limb (often following supracondylar fractures). * **The 6 P’s:** Pain, Pallor, Paresthesia, Pulselessness, Paralysis, and Poikilothermia. Note that **pulselessness is a late sign.** * **Management:** Immediate **fasciotomy** is the definitive treatment if compartment pressure exceeds 30 mmHg or is within 30 mmHg of the diastolic blood pressure (Delta pressure).

Q: Which nerve is most commonly involved in Volkmann's ischemic contracture of the forearm?

Median. **Explanation:** Volkmann’s Ischemic Contracture (VIC) is the permanent sequela of untreated or inadequately treated **Acute Compartment Syndrome** of the forearm. It results from ischemia and subsequent necrosis of the muscles and nerves within the tight fascial compartments. **Why the Median Nerve is Correct:** The **Median nerve** is the most commonly involved nerve because of its anatomical position. It travels through the deep part of the flexor compartment, specifically between the flexor digitorum superficialis and the flexor digitorum profundus. This area is the "watershed zone" of the forearm and is most susceptible to increased intracompartmental pressure. Prolonged ischemia leads to sensory loss in the lateral 3.5 fingers and motor weakness of the thenar muscles. **Analysis of Incorrect Options:** * **Ulnar Nerve:** While it can be involved in severe cases (leading to a "Global Volkmann's"), it is less frequently affected than the median nerve because it is located slightly more peripherally within the compartment. * **Radial Nerve:** This nerve primarily supplies the extensor compartment. VIC predominantly affects the flexor (anterior) compartment of the forearm. * **Posterior Interosseous Nerve (PIN):** This is a branch of the radial nerve. While it can be involved in compartment syndrome of the extensor compartment, it is not the primary nerve involved in the classic flexor-dominant VIC. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Supracondylar fracture of the humerus (due to brachial artery injury or swelling). * **Most common muscle involved:** Flexor Digitorum Profundus (FDP) and Flexor Pollicis Longus (FPL). * **Clinical Sign:** Pain on passive extension of fingers is the earliest and most reliable sign of impending ischemia. * **Classic Deformity:** Flexion of the wrist, extension of the MCP joints, and flexion of the IP joints (Claw-like hand).

Q: Cubitus valgus is typically associated with which anatomical variation?

Lateral condyle of humerus. **Explanation:** The correct answer is **Lateral condyle of humerus**. **Why it is correct:** Cubitus valgus (an increase in the carrying angle of the elbow) is a classic late complication of a **non-union of the lateral condyle of the humerus**. When a fracture of the lateral condyle fails to unite, there is a progressive arrest or retardation of growth on the lateral side of the distal humeral epiphysis. Meanwhile, the medial side (trochlea) continues to grow normally. This asymmetrical growth leads to a progressive outward deviation of the forearm, resulting in a valgus deformity. **Why the other options are incorrect:** * **Intercondylar region:** Fractures here (T or Y-shaped) usually lead to stiffness or osteoarthritis rather than a specific angular deformity like cubitus valgus. * **Olecranon process:** Fractures of the olecranon typically result in loss of active extension or triceps weakness, not a change in the carrying angle. * **Head of the radius:** Injuries here (like radial head fractures or dislocations) may cause restricted rotation (pronation/supination) or cubitus valgus only if associated with significant medial collateral ligament injury, but it is not the "typical" association. **High-Yield Clinical Pearls for NEET-PG:** * **Tardy Ulnar Nerve Palsy:** This is the most important complication of cubitus valgus. As the valgus deformity increases, the ulnar nerve is stretched around the medial epicondyle, leading to delayed (tardy) paralysis. * **Supracondylar Fracture:** Most commonly leads to **Cubitus Varus** (Gunstock deformity) due to malunion. * **Milch Classification:** Used for lateral condyle fractures; Type II is more unstable and prone to non-union. * **Treatment:** If the deformity is severe or symptomatic (ulnar nerve involvement), a **supracondylar osteotomy** may be required.

Question 1

A Hill-Sachs lesion is typically seen in which anatomical location?

Accepted Answer

Humeral head

Answer

Femoral head

Answer

Tibial shaft

Answer

Skull base

Question 2

Which muscle is tested by the "lift off" test?

Accepted Answer

Subscapularis

Answer

Infraspinatus

Answer

Supraspinatus

Answer

Teres minor

Question 3

Smith's fracture involves which bone?

Accepted Answer

Distal radius

Answer

Proximal ulna

Answer

Metatarsal

Answer

Patella

Question 4

A 33-year-old rugby player presents for follow-up after a first-time anterior shoulder dislocation 6 weeks ago. The shoulder has remained reduced. On examination, he has a good range of painless active and passive motion. Which of the following is considered a dynamic stabilizer of the glenohumeral joint?

Accepted Answer

Subscapularis muscle

Answer

Glenoid fossa

Answer

Coracohumeral ligament

Answer

Anteroinferior labral complex

Question 5

What is the characteristic deformity seen in a Colles fracture?

Accepted Answer

Pronation of the distal fragment

Answer

Proximal displacement of the distal fragment

Answer

Dorsal angulation of the distal fragment

Answer

Lateral angulation of the distal fragment

Question 6

A deviation of the mandible to the right side may suggest which of the following conditions?

Accepted Answer

Fracture of the right condyle

Answer

Fracture of the left condyle

Answer

Hyperplasia of the right condyle

Answer

Hypoplasia of the left condyle

Question 7

What is the first muscle affected in compartment syndrome?

Accepted Answer

Flexor Digitorum profundus

Answer

Flexor Digitorum sublimis

Answer

Flexor carpi ulnaris

Answer

Flexor carpi radialis

Question 8

Which nerve is most commonly involved in Volkmann's ischemic contracture of the forearm?

Accepted Answer

Median

Answer

Radial

Answer

Ulnar

Answer

Posterior interosseous

Question 9

A 50-year-old lady sprained her ankle 2 months back, from which she made a steady recovery. Two months after the injury, she gradually developed severe pain in her right ankle with significant limitation of ankle movement. Clinical examination reveals edema and shiny skin. What is the likely diagnosis?

Accepted Answer

Complex Regional Pain Syndrome Type I

Answer

Fibromyalgia

Answer

Complex Regional Pain Syndrome Type II

Answer

Peripheral Neuropathy

Question 10

Cubitus valgus is typically associated with which anatomical variation?

Accepted Answer

Lateral condyle of humerus

Answer

Intercondylar region of humerus

Answer

Olecranon process

Answer

Head of the radius

Trauma — MCQs

Trauma — MCQs

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