Trauma Practice Questions

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

Lachman's test. 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).

Q: Which of the following conditions shows the vascular sign of Narath?

Posterior dislocation of hip. **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)**.

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

Anterior cruciate ligament. **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).

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

Fracture of the lateral condyle of the humerus. **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.

Q: What is the full form of SCIWORA?

Spinal cord injury without radiographic abnormality. **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.

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

Lateral epicondylitis. **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.

Q: This diagnosis is?

Scaphoid fracture. ***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.

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

Median nerve. **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 1

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

Accepted Answer

Lachman's test

Answer

Pivot shift test

Answer

Anterior drawer test

Answer

McMurray's test

Question 2

Which of the following conditions shows the vascular sign of Narath?

Accepted Answer

Posterior dislocation of hip

Answer

Fracture neck of femur

Answer

Perthes disease

Answer

All of the above

Question 3

What is Pauvel's angle?

Accepted Answer

The angle formed by joining a line extended from the fracture line of the femur neck to an arbitrary line depicting the horizontal plane

Answer

Neck shaft angle of the femur

Answer

The difference between the neck shaft angle of the two femurs in a patient

Answer

None of the above

Question 4

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

Accepted Answer

Anterior cruciate ligament

Answer

Lateral collateral ligament

Answer

Medial collateral ligament

Answer

Patellar ligament

Question 5

Cubitus valgus deformity is a complication of which of the following?

Accepted Answer

Fracture of the lateral condyle of the humerus

Answer

Fracture through the intercondylar region of the humerus

Answer

Fracture of the olecranon

Answer

Fracture of the head of the radius

Question 6

What is the full form of SCIWORA?

Accepted Answer

Spinal cord injury without radiographic abnormality

Answer

Spinal cord injury with radiographic abnormality

Answer

Spinal cord injury with radiographic aberration

Answer

Spinal cord injury without radiographic aberration

Question 7

The Maudsley test is performed to assess for which condition?

Accepted Answer

Lateral epicondylitis

Answer

Medial epicondylitis

Answer

Carpal tunnel syndrome

Answer

De Quervain's disease

Question 8

This diagnosis is?

Accepted Answer

Scaphoid fracture

Answer

Rheumatoid arthritis

Answer

Scapholunate dissociation

Answer

Lunate dislocation

Question 9

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

Accepted Answer

Median nerve

Answer

Ulnar nerve

Answer

Radial nerve

Answer

Posterior interosseous nerve

Question 10

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

Accepted Answer

A transverse fracture

Answer

A compound fracture

Answer

Soft tissue interposition between the fractured ends

Answer

Such a fracture in a child

Trauma — MCQs

Trauma — MCQs

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