Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 411: What is the best diagnostic procedure for an anterior cruciate ligament injury?

A. Lachman's test (Correct Answer)
B. Pivot shift test
C. Anterior drawer test
D. McMurray's test

Explanation: The **Lachman’s test** is considered the most sensitive and reliable clinical test for diagnosing an acute Anterior Cruciate Ligament (ACL) injury. It is performed with the knee in **20-30° of flexion**, which minimizes the stabilizing effect of the secondary restraints (like the posterior horn of the medial meniscus), allowing for the most accurate assessment of anterior tibial translation. **Analysis of Options:** * **A. Lachman’s Test (Correct):** It has the highest sensitivity (~95%) for ACL tears. Because it is performed in slight flexion, it is less painful for patients with acute injuries and avoids "pseudo-locking" from hamstring spasms. * **B. Pivot Shift Test:** While this is the most **specific** test for ACL deficiency (indicating rotatory instability), it is often difficult to perform in an acute setting due to pain and guarding. It is best done under anesthesia. * **C. Anterior Drawer Test:** Performed at 90° of flexion. It is often falsely negative in acute cases because the hamstrings can pull the tibia back, and the posterior horn of the medial meniscus can wedge against the femur (the "wedge effect"), preventing anterior translation. * **D. McMurray’s Test:** This is used to diagnose **meniscal injuries**, not ligamentous laxity. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** MRI is the best imaging modality; however, **Diagnostic Arthroscopy** remains the definitive "Gold Standard." * **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 recent studies suggest the Lateral Meniscus is more commonly injured in acute cases).

Question 412: Which of the following conditions shows the vascular sign of Narath?

A. Fracture neck of femur
B. Perthes disease
C. Posterior dislocation of hip (Correct Answer)
D. All of the above

Explanation: **Explanation:** The **Vascular Sign of Narath** is a clinical finding used to assess the position of the femoral head in relation to the femoral artery. Under normal conditions, the femoral head lies directly behind the femoral artery in the groin, providing a solid bony backdrop that makes the femoral pulse easily palpable. **Why the Correct Answer is Right:** In **Posterior Dislocation of the Hip**, the femoral head is displaced backward and out of the acetabulum. Consequently, the femoral artery loses its posterior bony support. When a clinician palpates the femoral triangle, the femoral pulse feels significantly weaker or "hollow" compared to the unaffected side because the artery is now overlying soft tissue rather than bone. This "emptiness" or diminished pulse is the hallmark of Narath’s sign. **Analysis of Incorrect Options:** * **Fracture neck of femur:** While the anatomy is disrupted, the femoral head remains within the acetabulum (unless it is a rare fracture-dislocation), so the posterior support for the artery is generally maintained. * **Perthes disease:** This is an avascular necrosis of the femoral head in children. Although the head may flatten (coxa plana), it remains in the acetabulum, and the vascular sign of Narath is not observed. **High-Yield Clinical Pearls for NEET-PG:** 1. **Position of Limb:** Posterior dislocation presents with **flexion, adduction, and internal rotation** (the "dashboard injury" position). 2. **Nerve Injury:** The **Sciatic nerve** (specifically the peroneal division) is the most commonly injured nerve in posterior hip dislocations. 3. **Radiology:** On an AP X-ray, the femoral head appears smaller than the contralateral side in posterior dislocation (and larger in anterior dislocation). 4. **Emergency:** Hip dislocation is an orthopedic emergency; it must be reduced within 6 hours to minimize the risk of **Avascular Necrosis (AVN)**.

Question 413: What is Pauvel's angle?

A. Neck shaft angle of the femur
B. The difference between the neck shaft angle of the two femurs in a patient
C. The angle formed by joining a line extended from the fracture line of the femur neck to an arbitrary line depicting the horizontal plane (Correct Answer)
D. None of the above

Explanation: **Explanation:** **Pauwels’ Classification** is a biomechanical classification used for intracapsular femoral neck fractures. It is based on the orientation of the fracture line relative to the horizontal plane. 1. **Why Option C is Correct:** Pauwels’ angle is defined as the angle formed between the **fracture line** and an **imaginary horizontal line** passing through the pelvis. This angle determines the amount of shear stress versus compressive force acting at the fracture site. A more vertical fracture line (higher angle) increases shear forces, which leads to higher rates of non-union and internal fixation failure. 2. **Why Other Options are Incorrect:** * **Option A:** The neck-shaft angle (normal range 125°–135°) is an anatomical landmark, not Pauwels’ angle. * **Option B:** Comparing angles between two femurs is used for assessing deformities (like Coxa Vara/Valga) but does not define Pauwels’ classification. 3. **Clinical Pearls for NEET-PG:** * **Classification Grades:** * **Type I:** <30° (Stable; compressive forces dominate; high healing potential). * **Type II:** 30°–50°. * **Type III:** >50° (Unstable; shear forces dominate; high risk of non-union and AVN). * **Garden’s Classification:** While Pauwels’ is biomechanical, Garden’s classification (based on displacement) is more commonly used in clinical practice to decide between fixation and replacement. * **High-Yield Fact:** For Type III fractures in young patients, a **sliding hip screw (SHS)** or **Pauwels’ osteotomy** may be considered to convert shear forces into compressive forces.

Question 414: Injury to which of the following structures would MOST likely account for the increased anterior translation of the tibia in reference to the femur?

A. Anterior cruciate ligament (Correct Answer)
B. Lateral collateral ligament
C. Medial collateral ligament
D. Patellar ligament

Explanation: **Explanation:** The **Anterior Cruciate Ligament (ACL)** is the primary intra-articular stabilizer of the knee joint. Its fundamental biomechanical function is to prevent **anterior translation of the tibia** relative to the femur. It also provides secondary stability against internal rotation and valgus/varus stress. When the ACL is torn, the tibia can be pulled or pushed forward excessively, which is the hallmark of ACL deficiency. **Analysis of Options:** * **Anterior Cruciate Ligament (Correct):** Injury leads to a positive **Lachman test** (most sensitive) and **Anterior Drawer test**, both of which demonstrate increased anterior tibial translation. * **Lateral Collateral Ligament (LCL):** Primarily resists **varus** (outward) stress at the knee. Injury leads to lateral joint line opening, not anterior translation. * **Medial Collateral Ligament (MCL):** The most commonly injured knee ligament; it resists **valgus** (inward) stress. * **Patellar Ligament:** Part of the extensor mechanism. Rupture results in an inability to actively extend the knee and a high-riding patella (patella alta), but it does not control anterior-posterior translation. **Clinical Pearls for NEET-PG:** * **Mechanism of Injury:** Most commonly a non-contact pivoting injury (sudden deceleration/change of direction). * **Classic Triad (O'Donoghue’s):** Injury involving the **ACL, MCL, and Medial Meniscus** (though recent studies suggest Lateral Meniscus is more common in acute ACL tears). * **Segond Fracture:** An avulsion fracture of the lateral tibial condyle; it is pathognomonic for an ACL tear. * **Gold Standard Investigation:** MRI. * **Gold Standard Treatment:** Arthroscopic reconstruction (usually using Bone-Patellar Tendon-Bone or Hamstring graft).

Question 415: Cubitus valgus deformity is a complication of which of the following?

A. Fracture of the lateral condyle of the humerus (Correct Answer)
B. Fracture through the intercondylar region of the humerus
C. Fracture of the olecranon
D. Fracture of the head of the radius

Explanation: **Explanation:** **1. Why Option A is Correct:** Fracture of the lateral condyle of the humerus is the most common cause of **Cubitus Valgus**. This occurs due to **non-union** of the fracture fragment. The lateral condyle houses the growth plate for the lateral part of the distal humerus. When non-union occurs, there is a cessation of growth on the lateral side while the medial side (medial epicondyle/trochlea) continues to grow normally. This asymmetrical growth leads to an increase in the carrying angle, resulting in a valgus deformity. **2. Why Other Options are Incorrect:** * **Option B (Intercondylar Fracture):** These are complex intra-articular fractures in adults that usually lead to global joint stiffness or "elbow ankylosis" rather than a specific angular deformity like cubitus valgus. * **Option C (Olecranon Fracture):** This involves the proximal ulna. Complications typically include triceps weakness or loss of extension, not a change in the humeral-ulnar carrying angle. * **Option D (Radial Head Fracture):** This affects the forearm rotation (supination/pronation). While it may cause a minor change in elbow stability, it does not result in a progressive valgus deformity of the humerus. **3. Clinical Pearls for NEET-PG:** * **Tardy Ulnar Nerve Palsy:** This is the most famous late complication of Cubitus Valgus. As the valgus angle increases, the ulnar nerve is stretched around the medial epicondyle, leading to delayed ulnar neuropathy (years after the initial injury). * **Cubitus Varus (Gunstock Deformity):** This is the most common complication of **Supracondylar fractures** of the humerus (due to malunion). * **Lateral Condyle Fracture** is the "Fracture of Necessity" (usually requires Open Reduction and Internal Fixation) because it is intra-articular and prone to non-union due to the pull of extensor muscles and bathing in synovial fluid.

Question 416: What is the full form of SCIWORA?

A. Spinal cord injury with radiographic abnormality
B. Spinal cord injury with radiographic aberration
C. Spinal cord injury without radiographic aberration
D. Spinal cord injury without radiographic abnormality (Correct Answer)

Explanation: **Explanation:** **SCIWORA** stands for **Spinal Cord Injury Without Radiographic Abnormality**. 1. **Underlying Medical Concept:** This condition occurs when a patient presents with clinical signs of post-traumatic myelopathy (neurological deficits like paralysis or sensory loss), but conventional imaging—specifically **Plain X-rays and CT scans**—shows no evidence of fracture or dislocation. It is most commonly seen in the **pediatric population** (especially children <8 years) because their spinal columns are more elastic than the spinal cord itself. The vertebral column can stretch or momentarily displace and recoil, leaving the cord injured by traction or ischemia without leaving a bony "footprint" on a radiograph. 2. **Analysis of Options:** * **Option D is correct** as it uses the standard medical terminology. * **Options A and B** are incorrect because the defining feature of this syndrome is the *absence* of findings on standard imaging. * **Option C** is incorrect because "aberration" is not the standard clinical term used in this classification; "abnormality" is the universally accepted nomenclature. 3. **High-Yield Facts for NEET-PG:** * **Gold Standard Investigation:** While X-rays/CT are normal, **MRI** is the investigation of choice as it can detect intramedullary edema, hemorrhage, or ligamentous injury. * **Most Common Site:** The **Cervical spine** is the most frequently involved region. * **Mechanism:** Increased ligamentous laxity and shallow facet joints in children allow for transient subluxation. * **Prognosis:** Depends on the MRI findings; complete cord transection seen on MRI carries a poor prognosis, whereas normal MRI findings with clinical deficits have a better recovery rate.

Question 417: The Maudsley test is performed to assess for which condition?

A. Medial epicondylitis
B. Carpal tunnel syndrome
C. Lateral epicondylitis (Correct Answer)
D. De Quervain's disease

Explanation: **Explanation:** **Maudsley’s Test** is a clinical provocative test used to diagnose **Lateral Epicondylitis (Tennis Elbow)**. The underlying medical concept involves the origin of the **Extensor Digitorum Communis** muscle. During the test, the examiner resists the extension of the patient's **third (middle) finger** distal to the proximal interphalangeal joint while the elbow is extended. A positive result is indicated by sharp pain over the lateral epicondyle of the humerus, caused by tension on the extensor tendon origin. **Analysis of Incorrect Options:** * **Medial Epicondylitis (Golfer’s Elbow):** Assessed via the **Golfer’s Elbow Test**, where the patient experiences pain at the medial epicondyle during resisted wrist flexion and forearm pronation. * **Carpal Tunnel Syndrome:** Characterized by median nerve compression. Key tests include **Phalen’s maneuver** and **Tinel’s sign** at the wrist. * **De Quervain’s Disease:** A stenosing tenosynovitis of the first dorsal compartment (APL and EPB). The classic diagnostic test is **Finkelstein’s test**. **Clinical Pearls for NEET-PG:** * **Cozen’s Test:** Another common test for Tennis Elbow involving resisted wrist extension with a radial-deviated, clenched fist. * **Mill’s Test:** Passive stretching of the extensors (elbow extension, forearm pronation, and wrist flexion) that elicits pain in Tennis Elbow. * **Most Common Muscle Involved:** The **Extensor Carpi Radialis Brevis (ECRB)** is the muscle most frequently implicated in lateral epicondylitis.

Question 418: This diagnosis is?

A. Rheumatoid arthritis
B. Scapholunate dissociation
C. Lunate dislocation
D. Scaphoid fracture (Correct Answer)

Explanation: ***Scaphoid fracture*** - Classic mechanism of **fall on outstretched hand (FOOSH)** with forced **dorsiflexion** of wrist, commonly affecting the **scaphoid waist**. - Clinical presentation includes **anatomical snuffbox tenderness** and pain with **axial loading** of thumb and **scaphoid compression test**. *Rheumatoid arthritis* - Systemic autoimmune condition affecting **multiple joints symmetrically**, not typically presenting as acute wrist trauma. - Characterized by **morning stiffness**, **synovial swelling**, and **positive rheumatoid factor** rather than focal bone fracture. *Scapholunate dissociation* - Results in **widening of scapholunate interval** on X-ray (>3mm) and **Terry Thomas sign** on PA view. - Presents with **dorsal wrist pain** and **Watson's test positivity** but lacks the specific fracture line seen in scaphoid injury. *Lunate dislocation* - Shows characteristic **spilled teacup sign** on lateral X-ray with **lunate tilted volarly** and loss of normal carpal alignment. - Presents as **severe wrist deformity** with **median nerve compression symptoms** rather than localized scaphoid area tenderness.

Question 419: What is the most common nerve injured in a posterior dislocation of the elbow?

A. Ulnar nerve
B. Median nerve (Correct Answer)
C. Radial nerve
D. Posterior interosseous nerve

Explanation: **Explanation:** In a **posterior dislocation of the elbow**, the radius and ulna are displaced posteriorly relative to the distal humerus. This displacement stretches the neurovascular structures located anterior to the joint. **1. Why Median Nerve is Correct:** The **Median nerve** is the most commonly injured nerve in this scenario. As the distal humerus is driven forward (anteriorly) relative to the displaced forearm bones, it can tether, stretch, or entrap the median nerve against the humeral shaft or within the joint space. This is particularly common if there is an associated fracture of the medial epicondyle or coronoid process. **2. Analysis of Incorrect Options:** * **Ulnar Nerve:** While the ulnar nerve is frequently injured in supracondylar fractures or medial epicondyle fractures, it is less commonly involved in simple posterior dislocations because it lies posteromedial to the joint axis. * **Radial Nerve:** The radial nerve is located laterally and is more susceptible to injury in **Holstein-Lewis fractures** (distal 1/3rd humerus) or anterior dislocations, but it is rarely affected in posterior elbow dislocations. * **Posterior Interosseous Nerve (PIN):** This is a branch of the radial nerve. It is most commonly injured in **Monteggia fracture-dislocations** or radial head fractures/dislocations, rather than simple elbow dislocations. **Clinical Pearls for NEET-PG:** * **Brachial Artery:** This is the most common **vascular** structure injured in posterior elbow dislocations. Always check the radial pulse post-reduction. * **Terrible Triad of the Elbow:** Includes elbow dislocation, radial head fracture, and coronoid process fracture. * **Most common direction:** Posterior/Posterolateral is the most frequent type of elbow dislocation. * **Reduction Technique:** Traction followed by flexion.

Question 420: Intramedullary fixation is ideal in a case of fracture of the shaft of the femur when there is which of the following conditions?

A. A transverse fracture (Correct Answer)
B. A compound fracture
C. Soft tissue interposition between the fractured ends
D. Such a fracture in a child

Explanation: **Explanation:** Intramedullary (IM) nailing is the gold standard for treating fractures of the shaft of the femur in adults. The primary biomechanical advantage of an IM nail is that it acts as a **load-sharing device**, positioned in the neutral axis of the bone. **1. Why "A Transverse Fracture" is correct:** A transverse fracture provides excellent **axial stability**. Once the nail is inserted, the bone ends can abut each other, allowing the nail to resist bending forces while the bone itself handles the compressive load. This configuration minimizes the risk of shortening or rotation, making it the "ideal" scenario for IM fixation. **2. Why other options are incorrect:** * **B. Compound Fracture:** While IM nails can be used in Gustilo-Anderson Grade I and II open fractures, they are generally avoided or used with extreme caution in severe (Grade III) compound fractures due to the high risk of introducing infection into the medullary canal. * **C. Soft tissue interposition:** This is a relative contraindication for *closed* IM nailing. If soft tissue is trapped between fragments, it prevents reduction and leads to non-union. This usually requires an open reduction rather than simple IM fixation. * **D. Fracture in a child:** In children, the presence of open growth plates (physes) makes standard rigid IM nailing dangerous, as it can cause avascular necrosis of the femoral head or growth arrest. Flexible nails (TENs) are used instead, but rigid IM nailing is not the "ideal" standard as it is in adults. **Clinical Pearls for NEET-PG:** * **Gold Standard:** Locked Intramedullary Nailing is the treatment of choice for femoral shaft fractures in adults. * **Reaming:** Reamed nails allow for larger diameter nails (increased strength) and provide autologous bone graft at the site, though they carry a slightly higher risk of fat embolism. * **Winquist Classification:** Used to grade comminution in femoral shaft fractures; higher grades (III and IV) require interlocking screws to maintain length and rotation.

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Principles of Fracture Management

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Upper Limb Fractures

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Lower Limb Fractures

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Spinal Trauma

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Pelvic and Acetabular Fractures

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Open Fractures

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Fractures in Children

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Fracture Complications

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Nonunion and Malunion

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Polytrauma Management

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Joint Dislocations

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Soft Tissue Injuries

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Trauma — MCQs

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