Trauma Practice Questions

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

C1 (Atlas). **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.

Q: 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?

MRI. **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.

Q: 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?

Axillary nerve. ### 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**.

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

Supracondylar fractures. ### 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.

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

Opposition of thumb. **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.

Q: Putti Platt operation is performed for which condition?

Shoulder instability. **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**.

Question 1

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

Accepted Answer

Inferior Gluteal nerve palsy

Answer

Polio myelitis

Answer

Superior Gluteal nerve palsy

Answer

Posterior dislocation of the hip

Question 2

Jefferson's fracture is a fracture of which cervical vertebra?

Accepted Answer

C1 (Atlas)

Answer

Odontoid process

Answer

C2 (Axis)

Answer

C3

Question 3

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?

Accepted Answer

MRI

Answer

Strict bed rest for 10 days and repeat X-ray

Answer

Joint aspiration

Answer

Provide analgesia and mobilization to prevent stiffness

Question 4

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?

Accepted Answer

Axillary nerve

Answer

Musculocutaneous nerve

Answer

Radial nerve

Answer

Ulnar nerve

Question 5

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

Accepted Answer

Supracondylar fractures

Answer

Medial epicondyle fractures

Answer

Lateral epicondyle fractures

Answer

Posterior elbow dislocation

Question 6

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

Accepted Answer

Delayed swelling after injury typically suggests an ACL injury, while immediate swelling is indicative of a meniscal injury.

Answer

The McMurray test is used to assess for meniscal tears.

Answer

The Lachman test is used for the diagnosis of ACL injury.

Answer

The Beighton score is used to assess for predisposition to ligamentous injury.

Question 7

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?

Accepted Answer

Pulled elbow

Answer

Supracondylar fracture

Answer

Fracture of olecranon process

Answer

Radial head dislocation

Question 8

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

Accepted Answer

Opposition of thumb

Answer

Flexion of thumb

Answer

Abduction of thumb

Answer

Adduction of thumb

Question 9

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

Accepted Answer

Empty

Answer

Bony

Answer

Springy

Answer

Firm

Question 10

Putti Platt operation is performed for which condition?

Accepted Answer

Shoulder instability

Answer

Elbow instability

Answer

Rotator cuff tear

Answer

Biceps Tendinitis

Trauma — MCQs

Trauma — MCQs

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