Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 211: The Trendelenburg test is negative in which of the following conditions?

A. Polio myelitis
B. Superior Gluteal nerve palsy
C. Inferior Gluteal nerve palsy (Correct Answer)
D. Posterior dislocation of the hip

Explanation: ### Explanation The **Trendelenburg test** is a clinical assessment used to evaluate the integrity of the **hip abductor mechanism**. A positive test occurs when the pelvis drops toward the unsupported side (the side with the foot off the ground) while standing on one leg, indicating weakness or instability on the weight-bearing side. #### Why Inferior Gluteal Nerve Palsy is the Correct Answer: The primary muscles responsible for hip abduction and stabilizing the pelvis are the **Gluteus medius** and **Gluteus minimus**, both of which are innervated by the **Superior Gluteal Nerve**. The **Inferior Gluteal Nerve** supplies the **Gluteus maximus**, which is responsible for hip extension, not abduction. Therefore, a lesion of the inferior gluteal nerve does not affect the Trendelenburg test. #### Analysis of Incorrect Options: * **Poliomyelitis:** This condition can lead to lower motor neuron paralysis of the Gluteus medius and minimus, resulting in a positive Trendelenburg test due to muscle weakness. * **Superior Gluteal Nerve Palsy:** Since this nerve directly supplies the hip abductors, its injury leads to a classic positive Trendelenburg sign. * **Posterior Dislocation of the Hip:** This causes a positive test because the stable fulcrum (the femoral head in the acetabulum) is lost, and the distance between the origin and insertion of the abductor muscles is decreased (shortening), making them mechanically ineffective. #### Clinical Pearls for NEET-PG: * **The "Sound" Side Sags:** In a positive test, the pelvis drops on the **normal** side when the patient stands on the **affected** side. * **Trendelenburg Gait:** Also known as a "lurching gait," this occurs when the patient shifts their trunk toward the affected side to compensate for abductor weakness. * **Causes of Positive Trendelenburg:** 1. **Nerve:** Superior Gluteal Nerve injury. 2. **Muscle:** Polio, Myopathy. 3. **Bone/Joint:** SCFE, DDH, Coxa Vara, Femoral neck fractures, or Hip dislocation (loss of fulcrum).

Question 212: Jefferson's fracture is a fracture of which cervical vertebra?

A. Odontoid process
B. C1 (Atlas) (Correct Answer)
C. C2 (Axis)
D. C3

Explanation: **Explanation:** **Jefferson’s fracture** is a burst fracture of the **C1 vertebra (Atlas)**. It typically occurs due to a severe **axial loading** force applied to the top of the head (e.g., diving into shallow water or a motor vehicle accident). This force is transmitted through the occipital condyles onto the lateral masses of C1, causing the ring of the Atlas to "burst" at its weakest points—the anterior and posterior arches. **Analysis of Options:** * **B. C1 (Atlas) [Correct]:** The Atlas is a ring-like structure without a vertebral body. Axial compression causes a multi-fragmentary fracture of this ring, classically involving four breaks (two in the anterior arch and two in the posterior arch). * **A. Odontoid process:** This refers to the "dens" of the C2 vertebra. Fractures here are classified as Type I, II, or III (Anderson and D'Alonzo classification) and are distinct from Jefferson’s. * **C. C2 (Axis):** While C2 is the most common site for cervical fractures, the specific eponym for a C2 fracture is the **Hangman’s fracture** (traumatic spondylolisthesis of C2), not Jefferson’s. * **D. C3:** Fractures at this level are less common and do not carry a specific eponym like those of C1 and C2. **High-Yield Clinical Pearls for NEET-PG:** * **Radiology:** Diagnosed on an **Open-mouth (Odontoid) view** X-ray. Look for the lateral displacement of the lateral masses of C1 relative to C2. If the sum of displacement is **>7mm**, it indicates a rupture of the **Transverse Axial Ligament (TAL)**, signifying instability. * **Neurology:** Interestingly, Jefferson’s fracture is often **not** associated with spinal cord injury because the "burst" increases the diameter of the spinal canal (Spence’s Rule). * **Management:** Stable fractures are treated with a hard cervical collar; unstable fractures require a Halo vest or surgical fusion.

Question 213: A 60-year-old female presents after a fall with inability to stand. Examination reveals her right leg to be in external rotation with limited movement, and tenderness in Scarpa's triangle. There is no history of fever, and the X-ray shows no fracture line. What is the next step in management?

A. MRI (Correct Answer)
B. Strict bed rest for 10 days and repeat X-ray
C. Joint aspiration
D. Provide analgesia and mobilization to prevent stiffness

Explanation: **Explanation:** The clinical presentation of an elderly female with a fall, inability to weight-bear, and a leg in **external rotation** is highly suggestive of a **hip fracture** (specifically a femoral neck or intertrochanteric fracture). Tenderness in **Scarpa’s triangle** (femoral triangle) further localizes the pathology to the hip joint. **1. Why MRI is the Correct Answer:** In elderly patients with clinical signs of a hip fracture but **normal initial X-rays**, an **occult fracture** must be suspected. X-rays can be negative in up to 2–10% of hip fractures. **MRI is the gold standard** (100% sensitivity) for detecting occult fractures as it identifies bone marrow edema within 24 hours. If MRI is contraindicated, a CT scan or Bone Scan (after 48–72 hours) are alternatives. **2. Why Incorrect Options are Wrong:** * **Option B:** Delaying diagnosis with bed rest increases the risk of fracture displacement, avascular necrosis (AVN), and medical complications like DVT or pneumonia. * **Option C:** Joint aspiration is used to rule out septic arthritis. The absence of fever and the history of trauma make this unlikely. * **Option D:** Mobilizing an undiagnosed fracture can lead to displacement of a stable/impacted fracture, necessitating more invasive surgery (e.g., Arthroplasty instead of internal fixation). **Clinical Pearls for NEET-PG:** * **Classic Triad of Hip Fracture:** Shortening, Abduction, and External Rotation. * **Occult Fracture:** A fracture not visible on initial radiographs. * **Garden’s Classification:** Used for femoral neck fractures; Stage I and II are stable, III and IV are displaced. * **Management Rule:** In an elderly patient with hip pain after trauma and negative X-ray, **always** assume it is a fracture until proven otherwise by MRI.

Question 214: A 17-year-old male presented with complaints of severe shoulder pain along with his left arm hanging by the side with some external rotation. The patient suffered a blow to his left arm while playing football. A radiograph of the injured site was ordered. What is the most likely nerve injured?

A. Axillary nerve (Correct Answer)
B. Musculocutaneous nerve
C. Radial nerve
D. Ulnar nerve

Explanation: ### Explanation **Clinical Diagnosis: Anterior Dislocation of the Shoulder** The clinical presentation—a young athlete with a history of direct trauma, the arm held in **external rotation**, and severe pain—is classic for an **Anterior Shoulder Dislocation**. In this injury, the humeral head is displaced anteriorly and inferiorly. **1. Why Axillary Nerve is the Correct Answer:** The **Axillary nerve (C5, C6)** is the most commonly injured nerve in anterior shoulder dislocations due to its close anatomical proximity to the surgical neck of the humerus. As the humeral head displaces, it can stretch or compress the nerve within the quadrangular space. * **Clinical Sign:** Loss of sensation over the "Regimental Badge area" (lateral aspect of the deltoid) and weakness in shoulder abduction. **2. Why Other Options are Incorrect:** * **Musculocutaneous Nerve:** While it can be injured in severe trauma or Coracoid fractures, it is far less common than axillary nerve involvement in simple dislocations. * **Radial Nerve:** Most commonly injured in **fractures of the shaft of the humerus** (Holstein-Lewis fracture) or "Saturday Night Palsy." * **Ulnar Nerve:** Typically injured in fractures of the **medial epicondyle** of the humerus or elbow dislocations. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common type of shoulder dislocation:** Anterior (95%). * **Most common nerve injured:** Axillary nerve (Neuropraxia is the most common type of lesion). * **Hill-Sachs Lesion:** A compression fracture of the posterolateral humeral head (seen in anterior dislocation). * **Bankart Lesion:** Avulsion of the anterior-inferior labrum. * **Kocher’s Method & Milch’s Technique:** Common reduction maneuvers for anterior dislocation. * **Posterior Dislocation:** Associated with seizures or electric shocks; the arm is held in **internal rotation**.

Question 215: The three-point relationship is reversed in all of the following conditions EXCEPT:

A. Medial epicondyle fractures
B. Lateral epicondyle fractures
C. Supracondylar fractures (Correct Answer)
D. Posterior elbow dislocation

Explanation: ### Explanation The **three-point relationship** of the elbow refers to the clinical landmark formed by the **medial epicondyle, lateral epicondyle, and the tip of the olecranon**. In an extended elbow, these three points lie in a straight horizontal line; in a flexed elbow (90°), they form an equilateral triangle. #### Why Supracondylar Fracture is the Correct Answer: In a **supracondylar fracture of the humerus**, the fracture line is proximal to the epicondyles. Therefore, the entire distal humeral fragment (including both epicondyles) and the olecranon move together as a single unit. Because the anatomical relationship between the epicondyles and the olecranon remains undisturbed, the **three-point relationship is maintained (not reversed)**. This is a crucial clinical feature used to differentiate it from elbow dislocation. #### Analysis of Incorrect Options: * **Posterior Elbow Dislocation:** The olecranon is displaced posteriorly relative to the humeral epicondyles. This gross anatomical disruption **reverses or disturbs** the three-point triangle. * **Medial/Lateral Epicondyle Fractures:** Since one of the three reference points is fractured and displaced, the symmetry of the equilateral triangle is lost, resulting in a **disturbed** relationship. #### High-Yield Clinical Pearls for NEET-PG: * **Differentiating Point:** The most important clinical sign to distinguish a Supracondylar Fracture from Elbow Dislocation is the **maintenance of the three-point relationship** in the former. * **Gartland Classification:** Used for supracondylar fractures (Type I: Undisplaced, Type II: Displaced with intact posterior cortex, Type III: Completely displaced). * **Complications:** Watch for **Volkmann’s Ischemic Contracture (VIC)** and injury to the **Anterior Interosseous Nerve (AIN)**, which is the most common nerve injured in extension-type supracondylar fractures.

Question 216: Which of the following statements about ligament injuries around the knee is incorrect?

A. Delayed swelling after injury typically suggests an ACL injury, while immediate swelling is indicative of a meniscal injury. (Correct Answer)
B. The McMurray test is used to assess for meniscal tears.
C. The Lachman test is used for the diagnosis of ACL injury.
D. The Beighton score is used to assess for predisposition to ligamentous injury.

Explanation: ### Explanation **1. Why Option A is the Correct (Incorrect Statement):** In knee trauma, the timing of swelling (hemarthrosis vs. effusion) is a critical diagnostic clue. * **ACL Injury:** The Anterior Cruciate Ligament is highly vascular. Its rupture leads to **rapid/immediate swelling** (usually within 0–2 hours) due to acute hemarthrosis. * **Meniscal Injury:** Menisci are largely avascular (except the outer zone). Swelling in isolated meniscal tears is typically due to synovial irritation (effusion), which takes **several hours to a day (delayed swelling)** to manifest. Option A reverses these clinical findings, making it the incorrect statement. **2. Analysis of Other Options:** * **Option B (McMurray Test):** This is a classic provocative test for meniscal tears. A palpable/audible "thud" or "click" while extending the knee from a flexed position with rotation indicates a positive result. * **Option C (Lachman Test):** This is the **most sensitive** clinical test for an acute ACL tear. It is performed at 20–30° of flexion, minimizing the stabilization provided by the secondary restraints. * **Option D (Beighton Score):** This is a 9-point scoring system used to quantify **generalized joint laxity**. A high score indicates hypermobility, which predisposes individuals to ligamentous injuries and patellar dislocations. **3. NEET-PG High-Yield Pearls:** * **Most sensitive test for ACL:** Lachman Test. * **Most specific test for ACL:** Pivot Shift Test (difficult to perform in acute settings due to pain). * **Segond Fracture:** An avulsion fracture of the lateral tibial condyle; it is pathognomonic for an ACL tear. * **Unhappy Triad (O'Donoghue):** Injury involving the ACL, MCL, and Medial Meniscus (though lateral meniscus involvement is more common in acute ACL tears).

Question 217: A 2-year-old child is spinned around by his father holding his hand. Suddenly the child starts crying and does not allow his father to touch his elbow. Which of the following is the likely diagnosis?

A. Pulled elbow (Correct Answer)
B. Supracondylar fracture
C. Fracture of olecranon process
D. Radial head dislocation

Explanation: ### **Explanation** **Correct Option: A. Pulled Elbow (Nursemaid’s Elbow)** The clinical scenario describes a classic case of **Pulled Elbow** (Subluxation of the radial head). It typically occurs in children aged 1–4 years when sudden longitudinal traction is applied to an extended, pronated arm (e.g., swinging a child or pulling them up a curb). * **Mechanism:** The immature **annular ligament** is thin and lax. Sudden traction causes the radial head to slip partially out of the ligament, becoming trapped between the radial head and the capitellum. * **Clinical Presentation:** The child holds the arm in a fixed position of **pronation and slight flexion**, refusing to move the elbow (pseudoparalysis). There is usually no significant swelling or deformity. **Why Incorrect Options are Wrong:** * **B. Supracondylar Fracture:** This is the most common pediatric elbow fracture, but it usually results from a fall on an outstretched hand (FOOSH), not traction. It presents with gross swelling, deformity, and severe tenderness. * **C. Fracture of Olecranon:** Rare in toddlers; usually requires direct trauma to the point of the elbow. * **D. Radial Head Dislocation:** While "pulled elbow" is a subluxation, a true traumatic dislocation is often associated with an ulnar fracture (**Monteggia fracture-dislocation**) and presents with significant deformity and restricted range of motion. **High-Yield Clinical Pearls for NEET-PG:** 1. **Management:** Reduction is performed via **Supination and Flexion** (or the hyperpronation maneuver). A "click" is often felt, and the child typically resumes normal arm use within minutes. 2. **Radiology:** X-rays are usually normal and are only indicated if there is significant swelling or a history of a fall to rule out fractures. 3. **Anatomy:** The specific structure involved is the **annular ligament**. 4. **Age Group:** Most common between **1–4 years**; rare after age 5 as the ligament becomes thicker and the radial head more bulbous.

Question 218: Which action is affected in Bennet's fracture of the thumb?

A. Flexion of thumb
B. Abduction of thumb
C. Opposition of thumb (Correct Answer)
D. Adduction of thumb

Explanation: **Explanation:** **Bennett’s fracture** is an intra-articular fracture-subluxation at the base of the first metacarpal. The fracture line separates a small, triangular volar-ulnar fragment (which remains attached to the trapezium via the anterior oblique ligament) from the rest of the metacarpal shaft. **Why Opposition is affected (Correct Answer):** The stability of the **Carpometacarpal (CMC) joint** is crucial for the complex movement of **opposition**, which allows the thumb to touch the tips of other fingers. In Bennett’s fracture, the pull of the *Abductor Pollicis Longus (APL)* muscle displaces the metacarpal shaft proximally, radially, and dorsally. This disruption of the joint surface and the resulting instability directly impairs the circumduction and rotational components required for opposition. **Why other options are incorrect:** * **Flexion/Adduction:** These actions are primarily mediated by the *Flexor Pollicis Brevis* and *Adductor Pollicis*, which may still function, though they contribute to the deformity by pulling the distal fragment into the palm. * **Abduction:** While the *APL* is involved in the deformity, the primary functional loss described in clinical orthopaedics for this intra-articular injury is the loss of the "pulp-to-pulp" opposition mechanism. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Indirect longitudinal stress along the axis of the thumb (e.g., punching with a closed fist). * **Deforming Forces:** The small fragment is held by the **Anterior Oblique Ligament**; the shaft is displaced by the **APL** (Abductor Pollicis Longus). * **Rolando Fracture:** A comminuted T- or Y-shaped intra-articular fracture at the base of the first metacarpal (worse prognosis than Bennett's). * **Treatment:** Most cases require **Closed Reduction and Internal Fixation (CRIF)** with K-wires or Open Reduction (ORIF) because it is an unstable intra-articular fracture.

Question 219: In the "bounce home" test of the knee joint, what is the typical end feel described, EXCEPT?

A. Bony
B. Empty (Correct Answer)
C. Springy
D. Firm

Explanation: ### Explanation The **Bounce Home Test** is a clinical provocative maneuver used to assess the integrity of the knee joint, specifically to detect **meniscal tears** or intra-articular loose bodies that cause mechanical blockage. **Why "Empty" is the correct answer (the exception):** An **Empty end feel** occurs when the patient stops the movement before the clinician reaches the end of the range of motion, usually due to severe acute pain (e.g., in bursitis or neoplasms). It is not a characteristic finding of the bounce home test. In this test, the clinician passively flexes the knee and then allows it to extend (bounce) into full extension. If there is a mechanical block, the knee fails to reach full extension, resulting in a specific physical sensation. **Analysis of Incorrect Options:** * **Springy (C):** This is the **classic positive finding** for a torn meniscus (especially a bucket-handle tear). The knee "springs" back before reaching full extension due to the interposed tissue. * **Bony (A) / Firm (D):** While a "Springy" block is the hallmark, a **Bony** end feel can occur if there is a loose body or osteophyte causing the block. A **Firm** end feel is the normal physiological sensation when the knee reaches full extension and the posterior capsule/ligaments tighten. Since the question asks for the "typical end feel described" (including normal and pathological mechanical blocks), "Empty" is the only one that represents a non-mechanical, pain-limited stop. ### High-Yield Clinical Pearls for NEET-PG: * **Positive Test:** Failure to reach full extension or a "rubbery/springy" resistance indicates a **meniscal tear**. * **Differential Diagnosis:** If the block is accompanied by a "clunk," consider a **discoid meniscus**. * **Meniscal Tests Trio:** Remember the triad for meniscal injuries: **McMurray’s** (most specific), **Apley’s Grinding** (distinguishes ligament vs. meniscus), and **Thessaly’s** (most sensitive/functional). * **End Feel Summary:** * *Springy:* Meniscal tear. * *Empty:* Acute pain/Infection. * *Soft:* Edema/Synovitis. * *Hard/Bony:* Osteoarthritis/Loose bodies.

Question 220: Putti Platt operation is performed for which condition?

A. Elbow instability
B. Shoulder instability (Correct Answer)
C. Rotator cuff tear
D. Biceps Tendinitis

Explanation: **Explanation:** The **Putti-Platt operation** is a classic surgical procedure historically used for the management of **recurrent anterior shoulder instability**. **1. Why Shoulder Instability is Correct:** The underlying concept of the Putti-Platt procedure is "reefing" or **shortening of the subscapularis muscle and the anterior joint capsule**. By overlapping and suturing the cut ends of the subscapularis tendon (vest-over-pants repair), the surgeon creates a tight anterior barrier. This limits external rotation of the humeral head, thereby preventing anterior dislocation. While effective at preventing recurrence, it is less commonly performed today because the resulting loss of external rotation can lead to secondary osteoarthritis. **2. Why Other Options are Incorrect:** * **Elbow instability:** This is typically managed by ligamentous reconstruction (e.g., Tommy John surgery for UCL tears) or the Boyd-Anderson procedure, not Putti-Platt. * **Rotator cuff tear:** Management involves reattachment of the tendons (supraspinatus, infraspinatus, etc.) to the greater tuberosity, often via arthroscopic anchors. * **Biceps Tendinitis:** This is an inflammatory condition managed conservatively or via biceps tenodesis/tenotomy if chronic. **3. High-Yield Clinical Pearls for NEET-PG:** * **Bankart Repair:** The current "gold standard" for anterior instability; involves reattaching the detached anterior labrum to the glenoid rim. * **Bristow-Latarjet Procedure:** A bone-block procedure involving the transfer of the coracoid process to the glenoid for cases with significant bony defects. * **Magnuson-Stack Procedure:** Another historical surgery for shoulder instability involving the lateral advancement of the subscapularis insertion. * **Key Limitation:** The hallmark of a post-Putti-Platt patient is a permanent **loss of external rotation**.

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